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• HOUG Konferencia 2012

  - by user645740

  2012. március 26-án, azaz ma kezdodik Egerszalókon a magyarországi Oracle felhasználók rendszeres konferenciája, a HOUG Konferencia 2012, rengeteg érdekes eloadással, kerekasztal beszélgetéssel, networkinggel. A helyszínen még lehet személyesen regisztrálni, a HOUG tagoknak kedvezményes a részvétel. www.houg.hu Igen nagy az érdeklodés! A szálloda és néhány közeli szálláshely már megtelt. A környéken szerencsére még sok szálloda és fogadó található, tehát aki akar még mindig talál szobát. A programról, ami metekintheto, letöltheto: http://www.houg.hu/contents/files/houg2012_program_vegleges.pdf Kedden, március 27-én 10:15-11h John Abel fog izgalmas eloadást tartani az Oracle intelligens tervezett célrendszerekrol - "Extreme Performance with Oracle Engineered Systems", John Abel, Business Development director - EMEA, köztük az Oracle Exadata Database Machine adatázisgéprol is. Szintén kedden délután kerekasztal beszélgetésen fogjuk megtárgyalni ezen rendszerek magyarországi alkalmazásának lehetoségeit, igényeket: Exadata, SPARC SuperCluster, Exalogic, Exalytics, stb. 16:35-17:40, "Célrendszerek alkalmazhatósága a mindennapokban", a kerekasztal beszélgetés moderátora Fodor Endre. Kedd délután eloadást tartok az 13:45-14:35, "Oracle Exadata Database Machine: a világ leggyorsabb adatbázisgépe" címmel. A kedd délutáni Adatgyujtéstol az elemzésig szekció az üzleti intelligencia és adattárház ügyfél tapasztalatokról és technológiákról szól. A szekció vezetoi: Arató Bence, HOUG és Fekete Zoltán (én). BMW tesztvezetés, színházi és koncertprogram színesíti a rendezvényt.

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• Why is my Internet connection randomly dropping?

  - by Jeanno

  Ever since I have installed 12.04 (clean install not an upgrade), i have been having a drop in the Internet connection. The drop in the connection can be anything from 15 seconds to about 3 mins, and then the connection comes back. This behaviour happens while I am actively browsing the Internet, or if I wake up the computer and open Firefox (sometimes I have connection and sometimes I don't) . Please note that when the internet connection is on, it is not slow (as speedtest.net results show) In the beginning, I thought it was a problem with the driver r8169 for my RTL8111/8168B Ethernet card, so I downloaded the r8168 from Realtek website, followed the detailed instructions (blacklisted r8169, changed the file to '.bsh' ...), but still the same problem persisted. So I switched to a wireless connection, and I got the same problem with internet connection dropping randomly. Any ideas? Thanks in advance Output from 'lspci -v' Code: 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) Subsystem: Dell Device 04a7 Flags: bus master, fast devsel, latency 0 Capabilities: [e0] Vendor Specific Information: Len=0c <?> 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 0000e000-0000efff Memory behind bridge: f8000000-fa0fffff Prefetchable memory behind bridge: 00000000d0000000-00000000dbffffff Capabilities: [88] Subsystem: Dell Device 04a7 Capabilities: [80] Power Management version 3 Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [a0] Express Root Port (Slot+), MSI 00 Capabilities: [100] Virtual Channel Capabilities: [140] Root Complex Link Kernel driver in use: pcieport Kernel modules: shpchp 00:01.1 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=02, subordinate=02, sec-latency=0 I/O behind bridge: 0000d000-0000dfff Memory behind bridge: f4000000-f60fffff Prefetchable memory behind bridge: 00000000c0000000-00000000cbffffff Capabilities: [88] Subsystem: Dell Device 04a7 Capabilities: [80] Power Management version 3 Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [a0] Express Root Port (Slot+), MSI 00 Capabilities: [100] Virtual Channel Capabilities: [140] Root Complex Link Kernel driver in use: pcieport Kernel modules: shpchp 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) Subsystem: Dell Device 04a7 Flags: bus master, fast devsel, latency 0, IRQ 52 Memory at f6108000 (64-bit, non-prefetchable) [size=16] Capabilities: [50] Power Management version 3 Capabilities: [8c] MSI: Enable+ Count=1/1 Maskable- 64bit+ Kernel driver in use: mei Kernel modules: mei 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05) (prog-if 20 [EHCI]) Subsystem: Dell Device 04a7 Flags: bus master, medium devsel, latency 0, IRQ 16 Memory at f6107000 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port: BAR=1 offset=00a0 Capabilities: [98] PCI Advanced Features Kernel driver in use: ehci_hcd 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05) Subsystem: Dell Device 04a7 Flags: bus master, fast devsel, latency 0, IRQ 53 Memory at f6100000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 Capabilities: [100] Virtual Channel Capabilities: [130] Root Complex Link Kernel driver in use: snd_hda_intel Kernel modules: snd-hda-intel 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=03, subordinate=03, sec-latency=0 Memory behind bridge: fa400000-fa4fffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Dell Device 04a7 Capabilities: [a0] Power Management version 2 Kernel driver in use: pcieport Kernel modules: shpchp 00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=04, subordinate=04, sec-latency=0 I/O behind bridge: 0000c000-0000cfff Prefetchable memory behind bridge: 00000000dc100000-00000000dc1fffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Dell Device 04a7 Capabilities: [a0] Power Management version 2 Kernel driver in use: pcieport Kernel modules: shpchp 00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=05, subordinate=05, sec-latency=0 I/O behind bridge: 0000b000-0000bfff Memory behind bridge: fa300000-fa3fffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Dell Device 04a7 Capabilities: [a0] Power Management version 2 Kernel driver in use: pcieport Kernel modules: shpchp 00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=06, subordinate=06, sec-latency=0 I/O behind bridge: 0000a000-0000afff Memory behind bridge: fa200000-fa2fffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Dell Device 04a7 Capabilities: [a0] Power Management version 2 Kernel driver in use: pcieport Kernel modules: shpchp 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05) (prog-if 20 [EHCI]) Subsystem: Dell Device 04a7 Flags: bus master, medium devsel, latency 0, IRQ 23 Memory at f6106000 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port: BAR=1 offset=00a0 Capabilities: [98] PCI Advanced Features Kernel driver in use: ehci_hcd 00:1f.0 ISA bridge: Intel Corporation P67 Express Chipset Family LPC Controller (rev 05) Subsystem: Dell Device 04a7 Flags: bus master, medium devsel, latency 0 Capabilities: [e0] Vendor Specific Information: Len=0c <?> Kernel modules: iTCO_wdt 00:1f.2 RAID bus controller: Intel Corporation 82801 SATA Controller [RAID mode] (rev 05) Subsystem: Dell Device 04a7 Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 42 I/O ports at f070 [size=8] I/O ports at f060 [size=4] I/O ports at f050 [size=8] I/O ports at f040 [size=4] I/O ports at f020 [size=32] Memory at f6105000 (32-bit, non-prefetchable) [size=2K] Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [70] Power Management version 3 Capabilities: [a8] SATA HBA v1.0 Capabilities: [b0] PCI Advanced Features Kernel driver in use: ahci 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05) Subsystem: Dell Device 04a7 Flags: medium devsel, IRQ 5 Memory at f6104000 (64-bit, non-prefetchable) [size=256] I/O ports at f000 [size=32] Kernel modules: i2c-i801 01:00.0 VGA compatible controller: NVIDIA Corporation Device 0dc5 (rev a1) (prog-if 00 [VGA controller]) Subsystem: NVIDIA Corporation Device 085b Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at f8000000 (32-bit, non-prefetchable) [size=16M] Memory at d0000000 (64-bit, prefetchable) [size=128M] Memory at d8000000 (64-bit, prefetchable) [size=32M] I/O ports at e000 [size=128] Expansion ROM at fa000000 [disabled] [size=512K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Endpoint, MSI 00 Capabilities: [b4] Vendor Specific Information: Len=14 <?> Capabilities: [100] Virtual Channel Capabilities: [128] Power Budgeting <?> Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?> Kernel driver in use: nouveau Kernel modules: nouveau, nvidiafb 01:00.1 Audio device: NVIDIA Corporation GF106 High Definition Audio Controller (rev a1) Subsystem: NVIDIA Corporation Device 085b Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at fa080000 (32-bit, non-prefetchable) [size=16K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Endpoint, MSI 00 Kernel driver in use: snd_hda_intel Kernel modules: snd-hda-intel 02:00.0 VGA compatible controller: NVIDIA Corporation Device 0dc5 (rev a1) (prog-if 00 [VGA controller]) Subsystem: NVIDIA Corporation Device 085b Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at f4000000 (32-bit, non-prefetchable) [size=32M] Memory at c0000000 (64-bit, prefetchable) [size=128M] Memory at c8000000 (64-bit, prefetchable) [size=64M] I/O ports at d000 [size=128] Expansion ROM at f6000000 [disabled] [size=512K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Endpoint, MSI 00 Capabilities: [b4] Vendor Specific Information: Len=14 <?> Capabilities: [100] Virtual Channel Capabilities: [128] Power Budgeting <?> Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?> Kernel driver in use: nouveau Kernel modules: nouveau, nvidiafb 02:00.1 Audio device: NVIDIA Corporation GF106 High Definition Audio Controller (rev a1) Subsystem: NVIDIA Corporation Device 085b Flags: bus master, fast devsel, latency 0, IRQ 18 Memory at f6080000 (32-bit, non-prefetchable) [size=16K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Endpoint, MSI 00 Kernel driver in use: snd_hda_intel Kernel modules: snd-hda-intel 03:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) (prog-if 30 [XHCI]) Subsystem: Dell Device 04a7 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at fa400000 (64-bit, non-prefetchable) [size=8K] Capabilities: [50] Power Management version 3 Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+ Capabilities: [90] MSI-X: Enable+ Count=8 Masked- Capabilities: [a0] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [140] Device Serial Number ff-ff-ff-ff-ff-ff-ff-ff Capabilities: [150] Latency Tolerance Reporting Kernel driver in use: xhci_hcd 04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06) Subsystem: Dell Device 04a7 Flags: bus master, fast devsel, latency 0, IRQ 51 I/O ports at c000 [size=256] Memory at dc104000 (64-bit, prefetchable) [size=4K] Memory at dc100000 (64-bit, prefetchable) [size=16K] Capabilities: [40] Power Management version 3 Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [70] Express Endpoint, MSI 01 Capabilities: [b0] MSI-X: Enable- Count=4 Masked- Capabilities: [d0] Vital Product Data Capabilities: [100] Advanced Error Reporting Capabilities: [140] Virtual Channel Capabilities: [160] Device Serial Number 03-00-00-00-68-4c-e0-00 Kernel driver in use: r8168 Kernel modules: r8168 05:00.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6315 Series Firewire Controller (rev 01) (prog-if 10 [OHCI]) Subsystem: Dell Device 04a7 Flags: bus master, fast devsel, latency 0, IRQ 18 Memory at fa300000 (64-bit, non-prefetchable) [size=2K] I/O ports at b000 [size=256] Capabilities: [50] Power Management version 3 Capabilities: [80] MSI: Enable- Count=1/1 Maskable+ 64bit+ Capabilities: [98] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [130] Device Serial Number 00-10-dc-ff-ff-cf-56-1a Kernel driver in use: firewire_ohci Kernel modules: firewire-ohci 06:00.0 SATA controller: JMicron Technology Corp. JMB362 SATA Controller (rev 10) (prog-if 01 [AHCI 1.0]) Subsystem: Dell Device 04a7 Flags: bus master, fast devsel, latency 0, IRQ 19 I/O ports at a040 [size=8] I/O ports at a030 [size=4] I/O ports at a020 [size=8] I/O ports at a010 [size=4] I/O ports at a000 [size=16] Memory at fa210000 (32-bit, non-prefetchable) [size=512] Capabilities: [8c] Power Management version 3 Capabilities: [50] Express Legacy Endpoint, MSI 00 Kernel driver in use: ahci Note that my wireless card is not showing, I have the Ralink 3390 card (which apparently does not show up on Ubuntu for some reason), however I am able to connect to wireless network and connect to the internet (when it is working)

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• Oracle Solaris 11 ZFS Lab for Openworld 2012

  - by user12626122

  Preface This is the content from the Oracle Openworld 2012 ZFS lab. It was well attended - the feedback was that it was a little short - thats probably because in writing it I bacame very time-concious after the ASM/ACFS on Solaris extravaganza I ran last year which was almost too long for mortal man to finish in the 1 hour session. Enjoy. Table of Contents Exercise Z.1: ZFS Pools Exercise Z.2: ZFS File Systems Exercise Z.3: ZFS Compression Exercise Z.4: ZFS Deduplication Exercise Z.5: ZFS Encryption Exercise Z.6: Solaris 11 Shadow Migration Introduction This set of exercises is designed to briefly demonstrate new features in Solaris 11 ZFS file system: Deduplication, Encryption and Shadow Migration. Also included is the creation of zpools and zfs file systems - the basic building blocks of the technology, and also Compression which is the compliment of Deduplication. The exercises are just introductions - you are referred to the ZFS Adminstration Manual for further information. From Solaris 11 onward the online manual pages consist of zpool(1M) and zfs(1M) with further feature-specific information in zfs_allow(1M), zfs_encrypt(1M) and zfs_share(1M). The lab is easily carried out in a VirtualBox running Solaris 11 with 6 virtual 3 Gb disks to play with. Exercise Z.1: ZFS Pools Task: You have several disks to use for your new file system. Create a new zpool and a file system within it. Lab: You will check the status of existing zpools, create your own pool and expand it. Your Solaris 11 installation already has a root ZFS pool. It contains the root file system. Check this: root@solaris:~# zpool list NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT rpool 15.9G 6.62G 9.25G 41% 1.00x ONLINE - root@solaris:~# zpool status pool: rpool state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0 0 c3t0d0s0 ONLINE 0 0 0 errors: No known data errors Note the disk device the root pool is on - c3t0d0s0 Now you will create your own ZFS pool. First you will check what disks are available: root@solaris:~# echo | format Searching for disks...done AVAILABLE DISK SELECTIONS: 0. c3t0d0 <ATA-VBOX HARDDISK-1.0 cyl 2085 alt 2 hd 255 sec 63> /pci@0,0/pci8086,2829@d/disk@0,0 1. c3t2d0 <ATA-VBOX HARDDISK-1.0 cyl 1534 alt 2 hd 128 sec 32> /pci@0,0/pci8086,2829@d/disk@2,0 2. c3t3d0 <ATA-VBOX HARDDISK-1.0 cyl 1534 alt 2 hd 128 sec 32> /pci@0,0/pci8086,2829@d/disk@3,0 3. c3t4d0 <ATA-VBOX HARDDISK-1.0 cyl 1534 alt 2 hd 128 sec 32> /pci@0,0/pci8086,2829@d/disk@4,0 4. c3t5d0 <ATA-VBOX HARDDISK-1.0 cyl 1534 alt 2 hd 128 sec 32> /pci@0,0/pci8086,2829@d/disk@5,0 5. c3t6d0 <ATA-VBOX HARDDISK-1.0 cyl 1534 alt 2 hd 128 sec 32> /pci@0,0/pci8086,2829@d/disk@6,0 6. c3t7d0 <ATA-VBOX HARDDISK-1.0 cyl 1534 alt 2 hd 128 sec 32> /pci@0,0/pci8086,2829@d/disk@7,0 Specify disk (enter its number): Specify disk (enter its number): The root disk is numbered 0. The others are free for use. Try creating a simple pool and observe the error message: root@solaris:~# zpool create mypool c3t2d0 c3t3d0 'mypool' successfully created, but with no redundancy; failure of one device will cause loss of the pool So destroy that pool and create a mirrored pool instead: root@solaris:~# zpool destroy mypool root@solaris:~# zpool create mypool mirror c3t2d0 c3t3d0 root@solaris:~# zpool status mypool pool: mypool state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM mypool ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 c3t2d0 ONLINE 0 0 0 c3t3d0 ONLINE 0 0 0 errors: No known data errors Back to topExercise Z.2: ZFS File Systems Task: You have to create file systems for later exercises. You can see that when a pool is created, a file system of the same name is created: root@solaris:~# zfs list NAME USED AVAIL REFER MOUNTPOINT mypool 86.5K 2.94G 31K /mypool Create your filesystems and mountpoints as follows: root@solaris:~# zfs create -o mountpoint=/data1 mypool/mydata1 The -o option sets the mount point and automatically creates the necessary directory. root@solaris:~# zfs list mypool/mydata1 NAME USED AVAIL REFER MOUNTPOINT mypool/mydata1 31K 2.94G 31K /data1 Back to top Exercise Z.3: ZFS Compression Task:Try out different forms of compression available in ZFS Lab:Create 2nd filesystem with compression, fill both file systems with the same data, observe results You can see from the zfs(1) manual page that there are several types of compression available to you, set with the property=value syntax: compression=on | off | lzjb | gzip | gzip-N | zle Controls the compression algorithm used for this dataset. The lzjb compression algorithm is optimized for performance while providing decent data compression. Setting compression to on uses the lzjb compression algorithm. The gzip compression algorithm uses the same compression as the gzip(1) command. You can specify the gzip level by using the value gzip-N where N is an integer from 1 (fastest) to 9 (best compression ratio). Currently, gzip is equivalent to gzip-6 (which is also the default for gzip(1)). Create a second filesystem with compression turned on. Note how you set and get your values separately: root@solaris:~# zfs create -o mountpoint=/data2 mypool/mydata2 root@solaris:~# zfs set compression=gzip-9 mypool/mydata2 root@solaris:~# zfs get compression mypool/mydata1 NAME PROPERTY VALUE SOURCE mypool/mydata1 compression off default root@solaris:~# zfs get compression mypool/mydata2 NAME PROPERTY VALUE SOURCE mypool/mydata2 compression gzip-9 local Now you can copy the contents of /usr/lib into both your normal and compressing filesystem and observe the results. Don't forget the dot or period (".") in the find(1) command below: root@solaris:~# cd /usr/lib root@solaris:/usr/lib# find . -print | cpio -pdv /data1 root@solaris:/usr/lib# find . -print | cpio -pdv /data2 The copy into the compressing file system takes longer - as it has to perform the compression but the results show the effect: root@solaris:/usr/lib# zfs list NAME USED AVAIL REFER MOUNTPOINT mypool 1.35G 1.59G 31K /mypool mypool/mydata1 1.01G 1.59G 1.01G /data1 mypool/mydata2 341M 1.59G 341M /data2 Note that the available space in the pool is shared amongst the file systems. This behavior can be modified using quotas and reservations which are not covered in this lab but are covered extensively in the ZFS Administrators Guide. Back to top Exercise Z.4: ZFS Deduplication The deduplication property is used to remove redundant data from a ZFS file system. With the property enabled duplicate data blocks are removed synchronously. The result is that only unique data is stored and common componenents are shared. Task:See how to implement deduplication and its effects Lab: You will create a ZFS file system with deduplication turned on and see if it reduces the amount of physical storage needed when we again fill it with a copy of /usr/lib. root@solaris:/usr/lib# zfs destroy mypool/mydata2 root@solaris:/usr/lib# zfs set dedup=on mypool/mydata1 root@solaris:/usr/lib# rm -rf /data1/* root@solaris:/usr/lib# mkdir /data1/2nd-copy root@solaris:/usr/lib# zfs list NAME USED AVAIL REFER MOUNTPOINT mypool 1.02M 2.94G 31K /mypool mypool/mydata1 43K 2.94G 43K /data1 root@solaris:/usr/lib# find . -print | cpio -pd /data1 2142768 blocks root@solaris:/usr/lib# zfs list NAME USED AVAIL REFER MOUNTPOINT mypool 1.02G 1.99G 31K /mypool mypool/mydata1 1.01G 1.99G 1.01G /data1 root@solaris:/usr/lib# find . -print | cpio -pd /data1/2nd-copy 2142768 blocks root@solaris:/usr/lib#zfs list NAME USED AVAIL REFER MOUNTPOINT mypool 1.99G 1.96G 31K /mypool mypool/mydata1 1.98G 1.96G 1.98G /data1 You could go on creating copies for quite a while...but you get the idea. Note that deduplication and compression can be combined: the compression acts on metadata. Deduplication works across file systems in a pool and there is a zpool-wide property dedupratio: root@solaris:/usr/lib# zpool get dedupratio mypool NAME PROPERTY VALUE SOURCE mypool dedupratio 4.30x - Deduplication can also be checked using "zpool list": root@solaris:/usr/lib# zpool list NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT mypool 2.98G 1001M 2.01G 32% 4.30x ONLINE - rpool 15.9G 6.66G 9.21G 41% 1.00x ONLINE - Before moving on to the next topic, destroy that dataset and free up some space: root@solaris:~# zfs destroy mypool/mydata1 Back to top Exercise Z.5: ZFS Encryption Task: Encrypt sensitive data. Lab: Explore basic ZFS encryption. This lab only covers the basics of ZFS Encryption. In particular it does not cover various aspects of key management. Please see the ZFS Adminastrion Manual and the zfs_encrypt(1M) manual page for more detail on this functionality. Back to top root@solaris:~# zfs create -o encryption=on mypool/data2 Enter passphrase for 'mypool/data2': ******** Enter again: ******** root@solaris:~# Creation of a descendent dataset shows that encryption is inherited from the parent: root@solaris:~# zfs create mypool/data2/data3 root@solaris:~# zfs get -r encryption,keysource,keystatus,checksum mypool/data2 NAME PROPERTY VALUE SOURCE mypool/data2 encryption on local mypool/data2 keysource passphrase,prompt local mypool/data2 keystatus available - mypool/data2 checksum sha256-mac local mypool/data2/data3 encryption on inherited from mypool/data2 mypool/data2/data3 keysource passphrase,prompt inherited from mypool/data2 mypool/data2/data3 keystatus available - mypool/data2/data3 checksum sha256-mac inherited from mypool/data2 You will find the online manual page zfs_encrypt(1M) contains examples. In particular, if time permits during this lab session you may wish to explore the changing of a key using "zfs key -c mypool/data2". Exercise Z.6: Shadow Migration Shadow Migration allows you to migrate data from an old file system to a new file system while simultaneously allowing access and modification to the new file system during the process. You can use Shadow Migration to migrate a local or remote UFS or ZFS file system to a local file system. Task: You wish to migrate data from one file system (UFS, ZFS, VxFS) to ZFS while mainaining access to it. Lab: Create the infrastructure for shadow migration and transfer one file system into another. First create the file system you want to migrate root@solaris:~# zpool create oldstuff c3t4d0 root@solaris:~# zfs create oldstuff/forgotten Then populate it with some files: root@solaris:~# cd /var/adm root@solaris:/var/adm# find . -print | cpio -pdv /oldstuff/forgotten You need the shadow-migration package installed: root@solaris:~# pkg install shadow-migration Packages to install: 1 Create boot environment: No Create backup boot environment: No Services to change: 1 DOWNLOAD PKGS FILES XFER (MB) Completed 1/1 14/14 0.2/0.2 PHASE ACTIONS Install Phase 39/39 PHASE ITEMS Package State Update Phase 1/1 Image State Update Phase 2/2 You then enable the shadowd service: root@solaris:~# svcadm enable shadowd root@solaris:~# svcs shadowd STATE STIME FMRI online 7:16:09 svc:/system/filesystem/shadowd:default Set the filesystem to be migrated to read-only root@solaris:~# zfs set readonly=on oldstuff/forgotten Create a new zfs file system with the shadow property set to the file system to be migrated: root@solaris:~# zfs create -o shadow=file:///oldstuff/forgotten mypool/remembered Use the shadowstat(1M) command to see the progress of the migration: root@solaris:~# shadowstat EST BYTES BYTES ELAPSED DATASET XFRD LEFT ERRORS TIME mypool/remembered 92.5M - - 00:00:59 mypool/remembered 99.1M 302M - 00:01:09 mypool/remembered 109M 260M - 00:01:19 mypool/remembered 133M 304M - 00:01:29 mypool/remembered 149M 339M - 00:01:39 mypool/remembered 156M 86.4M - 00:01:49 mypool/remembered 156M 8E 29 (completed) Note that if you had created /mypool/remembered as encrypted, this would be the preferred method of encrypting existing data. Similarly for compressing or deduplicating existing data. The procedure for migrating a file system over NFS is similar - see the ZFS Administration manual. That concludes this lab session.

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• SQLAuthority News – Story of Seattle – SQLPASS 2011 Event Log

  - by pinaldave

  Just like every year I attended SQL PASS in Seattle earlier this month. The event was scheduled from Oct 11-14, 2011 in the convention center of the Seattle. I have been to Seattle more than 6 times so far so it is not a new city for me anymore. The city has always impressed me with its vibrant life and pleasant weather. Just like every other time, I had excellent experience once again in the city. Though I just arrived on the day of the event and left right after the event was over – I hardly visited Seattle – still some good experience to share. Here are few quick photographs from my quick trip of Seattle city. Skyline of Seattle Seattle Convention Center A Shop Tenzing Momo and Co at Pike St Market The Seattle Gum Wall Shoreline in Seattle Nigel and Paras First Starbucks (Relocated) People on Street of Seattle Food at Sandy’s – All Veg Well, this is a short summary of my extremely quick city tour of Seattle. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL PASS, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority Author Visit, SQLAuthority News, T SQL, Technology

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• NTP service, offset increasing after sync

  - by Ajay

  I have installed Ubuntu 12.10 version on my PC. I am running NTP service having NTP server as GPS. I found that when we start NTP service by ntp start command, PC is able to sync with GPS as i get '*' symbol before GPS IP when i run ntpq -p command. This remains good for some time and then the * symbol is removed which means that PC is not synchronized to that server. Now, by running command ntpq -p it shows that all parameter are OK but as '*' is removed, slowly offset goes on increasing. remote refid st t when poll reach delay offset jitter ============================================================================== *192.168.100.33 .GPS. 1 u 7 16 1 2.333 23.799 0.808 remote refid st t when poll reach delay offset jitter ============================================================================== *192.168.100.33 .GPS. 1 u 14 16 3 2.333 23.799 0.879 remote refid st t when poll reach delay offset jitter ============================================================================== *192.168.100.33 .GPS. 1 u 11 16 7 2.333 23.799 1.500 remote refid st t when poll reach delay offset jitter ============================================================================== *192.168.100.33 .GPS. 1 u 8 16 17 2.333 23.799 2.177 below are the last 4 ntp status when sync is lost with GPS ============================================================================== 192.168.100.33 .GPS. 1 u 1 16 377 2.404 1169.94 1.735 remote refid st t when poll reach delay offset jitter ============================================================================== 192.168.100.33 .GPS. 1 u - 16 377 2.513 1171.80 0.898 remote refid st t when poll reach delay offset jitter ============================================================================== 192.168.100.33 .GPS. 1 u 15 16 377 2.513 1171.80 0.898 Since, GPS is already available, PC never re-synchronize itself to GPS later ON. I have to restart the ntp service and then PC synchronizes to GPS and '*' symbol arrives.

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• SQL SERVER – Get Free Books on While Learning SQL Server 2012 Error Handling

  - by pinaldave

  Fans of this blog are aware that I have recently released my new books SQL Server Functions and SQL Server 2012 Queries. The books are available in market in limited edition but you can avail them for free on Wednesday Nov 14, 2012. Not only they are free but you can additionally learn SQL Server 2012 Error Handling as well. My book’s co-author Rick Morelan is presenting a webinar tomorrow on SQL Server 2012 Error Handling. Here is the brief abstract of the webinar: People are often shocked when they see the demo in this talk where the first statement fails and all other statements still commit. For example, did you know that BEGIN TRAN…COMMIT TRAN is not enough to make everything work together? These mistakes can still happen to you in SQL Server 2012 if you are not aware of the options. Rick Morelan, creator of Joes2Pros, will teach you how to predict the Error Action and control it with & without structured error handling. Register for the webinar now to learn: How to predict the Error Action and control it Nuances between successful and failing SQL statements Essential SQL Server 2012 configuration options Register for the Webinar and be present during the webinar. My co-author will announce a winner (may be more than 1 winner) during the session. If you are present during the session – you are eligible to win the book. The webinar is scheduled for 2 different times to accommodate various time zones. 1) 10am ET/7am PT 2) 1pm ET/11am PT. Each webinar will have their own winner. You can increase your chances by attending both the webinars. Do not miss this opportunity and register for the webinar right now. The recordings of the webinar may not be available. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Joes 2 Pros, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, SQLServer, T SQL, Technology

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• Ubuntu 12.04 NVIDIA GeForce Go 7600 black screen during boot

  - by Florian Schmidt

  I'm using Ubuntu as the only operating system since two years. In the first Ubuntu versions I had seen my BIOS screen and the boot screens. Actually im using Ubuntu 12.04 and my screen stays black until Ubuntu is started (both screens are missing). I guess this situation appeared the first time in Ubuntu 11 (not sure). I searched via google and tried the popular activities but was not able to fix my issue. I opened the laptop and checked all connections. I'm using boot option nomodeset. I had a look through many many web pages. I don't know how to continue and hope somebody could be helpful. My hardware: Acer Aspire 9300 AMD Turion 64 x2 NVIDIA GeForce Go 7600 (using proposed driver) lspci | grep NVIDIA 00:00.0 RAM memory: NVIDIA Corporation C51 Host Bridge (rev a2) 00:00.1 RAM memory: NVIDIA Corporation C51 Memory Controller 0 (rev a2) 00:00.2 RAM memory: NVIDIA Corporation C51 Memory Controller 1 (rev a2) 00:00.3 RAM memory: NVIDIA Corporation C51 Memory Controller 5 (rev a2) 00:00.4 RAM memory: NVIDIA Corporation C51 Memory Controller 4 (rev a2) 00:00.5 RAM memory: NVIDIA Corporation C51 Host Bridge (rev a2) 00:00.6 RAM memory: NVIDIA Corporation C51 Memory Controller 3 (rev a2) 00:00.7 RAM memory: NVIDIA Corporation C51 Memory Controller 2 (rev a2) 00:02.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:03.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:04.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:09.0 RAM memory: NVIDIA Corporation MCP51 Host Bridge (rev a2) 00:0a.0 ISA bridge: NVIDIA Corporation MCP51 LPC Bridge (rev a3) 00:0a.1 SMBus: NVIDIA Corporation MCP51 SMBus (rev a3) 00:0a.3 Co-processor: NVIDIA Corporation MCP51 PMU (rev a3) 00:0b.0 USB controller: NVIDIA Corporation MCP51 USB Controller (rev a3) 00:0b.1 USB controller: NVIDIA Corporation MCP51 USB Controller (rev a3) 00:0d.0 IDE interface: NVIDIA Corporation MCP51 IDE (rev f1) 00:0e.0 IDE interface: NVIDIA Corporation MCP51 Serial ATA Controller (rev f1) 00:10.0 PCI bridge: NVIDIA Corporation MCP51 PCI Bridge (rev a2) 00:10.1 Audio device: NVIDIA Corporation MCP51 High Definition Audio (rev a2) 00:14.0 Bridge: NVIDIA Corporation MCP51 Ethernet Controller (rev a3) 03:00.0 VGA compatible controller: NVIDIA Corporation G73 [GeForce Go 7600] (rev a1) So my question is what to do to fix the black screen during boot?

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• C# Simple Twitter Update

  - by mroberts

  For what it's worth a simple twitter update. 1: using System; 2: using System.IO; 3: using System.Net; 4: using System.Text; 5:   6: namespace Server.Actions 7: { 8: public class TwitterUpdate 9: { 10: public string Body { get; set; } 11: public string Login { get; set; } 12: public string Password { get; set; } 13:   14: public override void Execute() 15: { 16: try 17: { 18: //encode user name and password 19: string creds = Convert.ToBase64String(Encoding.ASCII.GetBytes(string.Format("{0}:{1}", this.Login, this.Password))); 20:   21: //encode tweet 22: byte[] tweet = Encoding.ASCII.GetBytes("status=" + this.Body); 23:   24: //setup request 25: HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://twitter.com/statuses/update.xml"); 26: request.Method = "POST"; 27: request.ServicePoint.Expect100Continue = false; 28: request.Headers.Add("Authorization", string.Format("Basic {0}", creds)); 29: request.ContentType = "application/x-www-form-urlencoded"; 30: request.ContentLength = tweet.Length; 31:   32: //write to stream 33: Stream reqStream = request.GetRequestStream(); 34: reqStream.Write(tweet, 0, tweet.Length); 35: reqStream.Close(); 36:   37: //check response 38: HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 39:   40: //... 41: } 42: catch (Exception e) 43: { 44: //... 45: } 46: } 47: } 48: }   BTW, this is my first blog post.  Nothing earth shattering, I admit, but I needed to figure out how to post formatted code.  In the past I’ve used Alex Gorbatchev’s Syntax Highlighter with great success, but here at GWB I couldn’t get it to work. Windows Live Writer though, being a stand alone writer, worked with no problems.  For now, that’s what I’ll use.

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• ArchBeat Link-o-Rama for 11/14/2011

  - by Bob Rhubart

  InfoQ: Developer-Driven Threat Modeling Threat modeling is critical for assessing and mitigating the security risks in software systems. In this IEEE article, author Danny Dhillon discusses a developer-driven threat modeling approach to identify threats using the dataflow diagrams. Managing the Virtual World | Philip J. Gill "The killer app for virtualization has been server consolidation," says Al Gillen, program vice president for systems software at market research firm International Data Corporation (IDC). Solaris X86 AESNI OpenSSL Engine | Dan Anderson "Having X86 AESNI hardware crypto instructions is all well and good, but how do we access it? The software is available with Solaris 11 and is used automatically if you are running Solaris x86 on a AESNI-capable processor," says Anderson. WebLogic Access Management | René van Wijk "This post is a continuation of the post WebLogic Identity Management. In this post we will present the steps involved to integrate WebLogic and Oracle Access Manager," says Oracle ACE René van Wijk. OTN Developer Days in the Nordics - Helsinki, Oslo, Stockholm, and Copenhagen OTN Developer days head for the land of the midnight sun. Podcast: Information Integration Part 2/3 In part two of a three-part program, Oracle Information Integration, Migration, and Consolidation authors Jason Williamson, Tom Laszewsk, and Marc Hebert offer examples of some of the most daunting information integration challenges. Measuring the Human Task activity in Oracle BPM | Leon Smiers Leon Smiers discusses using Oracle BPM to get answer to important questions about what's happening with business process. Architecture all day. Oracle Technology Network Architect Day - Phoenix, AZ- Dec 14 Spend the day with your peers learning from experts in Cloud computing, engineered systems, and Oracle Fusion Middleware. The Heroes of Java: Michael Hüttermann | Markus Eisele Oracle ACE Director Markus Eisele interviews Java Champion Michael Hüttermann on his role, his process, and on why he uses Java.

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• ArchBeat Link-o-Rama for 11/22/2011

  - by Bob Rhubart

  A Brief Introduction on Migrating to an Oracle-based Cloud Environment | Tom Laszewski "Before you can start migrating to the cloud, you must define what the cloud means to you," says Tom Laszeski. "The cloud is not a specific software or hardware product; contrary to what many technology vendors would have you believe." Custom Exception Registration for ADF BC EO Attribute | Andrejus Baranovskis "Sometimes customers prefer to implement business logic validation completely in Java, without using ADF BC declarative/Groovy validation rules," says Oracle ACE Director Andrejus Baranovskis. "Thats fine, we can code business logic validation in ADF and implement different custom validation methods on VO/EO level." Oracle Exadata Virtual Conference - Jan 20 2012 The Exadata SIG, along with IOUG, is organizing the First Exadata Virtual Conference, to be held on January 20, 2012. Proposals for presentations are now being accepted. Smooth Sailing or Rough Waters: Navigating Policy Administration Modernization | Helen Pitts "It’s no surprise that fueling growth, both now and in the future, continues to be a key driver for modernization" says Helen Pitts. "Why? Inflexible, hard-coded, legacy systems require customization by IT every time a change is required." Architects putting on the Ritz; Info integration book learning; Platform for SAS Grid Computing This week on the Architect Home Page on OTN. Webcast: Introducing Oracle WebLogic Server 12c: Developer Deep Dive - Dec 1 - 11am PT / 2pm ET Learn how Oracle WebLogic Server 12c enables rapid development of modern, lightweight Java EE 6 applications. Discover how you can leverage the latest development technologies, tools and standards when deploying to Oracle WebLogic Server across both conventional and Cloud environments. Architecture all day. Oracle Technology Network Architect Day - Phoenix, AZ - Dec14. Free registration. When: December 14, 2011 Where: The Ritz-Carlton, Phoenix, 2401 East Camelback Road, Phoenix, AZ 85016 Registration is free, but seating is limited.

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• Java Spotlight Episode 106: Java Security Update @spoofzu

  - by Roger Brinkley

  Java security update with Bruce Lowenthal and Milton Smith. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News Apple's Java Mac OS X 2012-006 Update NightHacking Tour Across Europe Four New Java Champions Oracle Announces Availability of Oracle Solaris 11.1 and Oracle Solaris Cluster 4.1 Oracle Announces General Availability of Oracle Application Development Framework Mobile Bean Validation 1.1 Early Draft JSR 107 Early Draft JCP Elections - Meet the Candidates GlassFish switching to JDK-7 only build Events Oct 30-Nov 1, Arm TechCon, Santa Clara, United States of America Oct 31, JFall, Hart van Holland, Netherlands Nov 2-3, JMaghreb, Rabat, Morocco Nov 5-9, Øredev Developer Conference, Malmö, Sweden Nov 13-17, Devoxx, Antwerp, Belgium Nov 20-22, DOAG 2012, Nuremberg, Germany Dec 3-5, jDays, Göteborg, Sweden Dec 4-6, JavaOne Latin America, Sao Paolo, Brazil Dec 14-15, IndicThreads, Pune, India Feature InterviewMilton Smith leads the security program for Java products at Oracle. His responsibilities span from tactical to strategic: definition and communication of the security vision for Java, working with engineering teams and researchers, as well as industry at large. He has over 20+ years of industry experience with emphasis in programming and computer security. Milton previous employer was Yahoo where he lead security for the User Data Analytics(UDA) property.Bruce Lowenthal is the Senior Director of Security Alerts at Oracle Corporation. What’s Cool Andrew Haley on an OpenJDK ARM64 Port Joe Darcy - JDK bug migration: bugs.sun.com now backed by JIRA Marcus Hirt on Using the Mission Control DTrace Plug-in

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• Steam freezes at login screen

  - by Snail284069

  I have just installed Steam on Xubuntu, and after it finished installing it went to the login screen, but the screen is frozen, and I cannot press the buttons. When running Steam though the terminal it says: alex@Craptop:~$ steam Running Steam on ubuntu 14.04 32-bit STEAM_RUNTIME is enabled automatically Installing breakpad exception handler for appid(steam)/version(1400690891_client) Installing breakpad exception handler for appid(steam)/version(1400690891_client) Installing breakpad exception handler for appid(steam)/version(1400690891_client) Installing breakpad exception handler for appid(steam)/version(1400690891_client) Gtk-Message: Failed to load module "overlay-scrollbar" Gtk-Message: Failed to load module "unity-gtk-module" Installing breakpad exception handler for appid(steam)/version(1400690891_client) [0522/174755:WARNING:proxy_service.cc(958)] PAC support disabled because there is no system implementation Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 78: saw unknown, expected number Installing breakpad exception handler for appid(steam)/version(1400690891_client) Installing breakpad exception handler for appid(steam)/version(1400690891_client) [HTTP Remote Control] HTTP server listening on port 35849. Installing breakpad exception handler for appid(steam)/version(1400690891_client) Installing breakpad exception handler for appid(steam)/version(1400690891_client) Process 2764 created /alex-ValveIPCSharedObjects5 Installing breakpad exception handler for appid(steam)/version(1400690891_client) Generating new string page texture 12: 48x256, total string texture memory is 49.15 KB Generating new string page texture 13: 256x256, total string texture memory is 311.30 KB Generating new string page texture 14: 128x256, total string texture memory is 442.37 KB Generating new string page texture 15: 384x256, total string texture memory is 835.58 KB and then the terminal gets stuck too, letting me type into it but not doing anything. I tried reinstalling and restarting the computer, but it still keeps happening.

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• Install modern browser on Maverick?

  - by feklee

  I tried installing Chrome from the official repository, but I get: $ sudo apt-get install google-chrome-stable Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: google-chrome-stable : Depends: gconf-service but it is not installable Depends: libgconf-2-4 (>= 2.31.1) but it is not installable Depends: libgtk2.0-0 (>= 2.24.0) but 2.22.0-0ubuntu1 is to be installed Depends: libnspr4 (>= 1.8.0.10) but it is not installable Depends: libnss3 (>= 3.14.3) but it is not installable Depends: libstdc++6 (>= 4.6) but 4.5.1-7ubuntu2 is to be installed Depends: libx11-6 (>= 2:1.4.99.1) but 2:1.3.3-3ubuntu1 is to be installed E: Broken packages Note: This is neither my system, nor do I want to do a full system upgrade. Any modern browser will do. Flash plugin is also needed, if not included in the browser.

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• A Technical Perspective On Rapid Planning

  - by Robert Story

  Upcoming WebcastTitle: A Technical Perspective On Rapid PlanningDate: April 14, 2010 Time: 11:00 am EDT, 9:00 am MDT, 8:00 am PDT, 16:00 GMT Product Family: Value Chain PlanningSummary Oracle's Strategic Network Optimization (SNO) product is a powerful supply chain design and tactical planning tool.  This one-hour session is recommended for functional users who want to gain a better understanding of how Oracle's SNO solution can help you solve complex supply chain issues, including supply chain design, risk management, logistics planning, sustainability planning, and a whole lot in between! Find out how SNO can be used to solve many different types of real-world business issues. Topics will include: Risk/Disaster Management Carbon Emissions Management Global Sourcing Labor/Workforce Planning Product Mix Optimization A short, live demonstration (only if applicable) and question and answer period will be included. Click here to register for this session....... ....... ....... ....... ....... ....... .......The above webcast is a service of the E-Business Suite Communities in My Oracle Support.For more information on other webcasts, please reference the Oracle Advisor Webcast Schedule.Click here to visit the E-Business Communities in My Oracle Support Note that all links require access to My Oracle Support.

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• New training on Power Pivot with recorded video courses

  - by Marco Russo (SQLBI)

  I and Alberto Ferrari started delivering training on Power Pivot in 2010, initially in classrooms and then also online. We also recorded videos for Project Botticelli, where you can find content about Microsoft tools and services for Business Intelligence. In the last months, we produced a recorded video course for people that want to learn Power Pivot without attending a scheduled course. We split the entire Power Pivot course training in three editions, offering at a lower price the more introductive modules: Beginner: introduces Power Pivot to any user who knows Excel and want to create reports with more complex and large data structures than a single table. Intermediate: improves skills on Power Pivot for Excel, introducing the DAX language and important features such as CALCULATE and Time Intelligence functions. Advanced: includes a depth coverage of the DAX language, which is required for writing complex calculations, and other advanced features of both Excel and Power Pivot. There are also two bundles, that includes two or three editions at a lower price. Most important, we have a special 40% launch discount on all published video courses using the coupon SQLBI-FRNDS-14 valid until August 31, 2014. Just follow the link to see a more complete description of the editions available and their discounted prices. Regular prices start at $29, which means that you can start a training with less than $18 using the special promotion. P.S.: we recently launched a new responsive version of the SQLBI web site, and now we also have a page dedicated to all videos available about our sessions in conferences around the world. You can find more than 30 hours of free videos here: http://www.sqlbi.com/tv.

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• problem with Webmaster Google Sitemap

  - by Alex

  I have a wp mu 3.6.1 with domain mapping (0.5.4.3) with w3tc (0.9.3) and Google XML Sitemaps (4.0 BETA). I have 4 different sitemaps. sub-1.com/sitemap.xml sub-2.com/sitemap.xml sub-3.com/sitemap.xml sub-4.com/sitemap.xml on google webmaster i got 59 errors & 14 warnings. Sitemap errorsErrors: We encountered an error while trying to access your Sitemap. Please ensure your Sitemap follows our guidelines and can be accessed at the location you provided and then resubmit. General HTTP error: 404 not found Sitemap: sub-2.com/sitemap-pt-post-2011-02.xml etc (but when i click on my sitemap links they work fine) Sitemap errorsWarnings: URLs not accessible When we tested a sample of the URLs from your Sitemap, we found that some URLs were not accessible to Googlebot due to an HTTP status error. All accessible URLs will still be submitted. Sitemap: sub-2.com/sitemap-misc.xml HTTP Error: 404 URL: /sitemap.html (but when i click on my sitemap links they work fine) Sitemap errorsIndex errors URLs not accessible When we tested a sample of the URLs from your Sitemap, we found that some URLs were not accessible to Googlebot due to an HTTP status error. All accessible URLs will still be submitted. HTTP Error: 404 URL: /sitemap-pt-post-2010-09.xml (but when i click on my sitemap links they work fine) Web pages 3,276 Submitted 3,247 Indexed what do I have to put on network adminperformance(w3tc)page cachecache preloadSitemap URL: ? i have add "/sitemap.xml" my robots.txt: http://pastebin.com/3K2U0mQa my .htaccess: http://pastebin.com/efJJ6zwy How can I make it work right?

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• A Technical Perspective On Rapid Planning

  - by Robert Story

  Upcoming WebcastTitle: Strategic Network Optimization - One Solution for Many Problems!Date: April 14, 2010 Time: 11:00 am EDT, 9:00 am MDT, 8:00 am PDT, 16:00 GMT Product Family: Value Chain PlanningSummary This one-hour session is recommended for System Administrators, Database Administrators, and Technical Users seeking a general overview of Rapid Planning, installation issues, and debug information. This webcast is intended to provide users with insight into known issues, and an overview of the debugging possibilities for Rapid Planning. Topics will include: Benefits of using simulation planning Installing Oracle Rapid planning, points to be aware of Relevant tables Rapid planning log files Information needed by supportA short, live demonstration (only if applicable) and question and answer period will be included. Click here to register for this session....... ....... ....... ....... ....... ....... .......The above webcast is a service of the E-Business Suite Communities in My Oracle Support.For more information on other webcasts, please reference the Oracle Advisor Webcast Schedule.Click here to visit the E-Business Communities in My Oracle Support Note that all links require access to My Oracle Support.

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• How do i delete these files?

  - by user107277

  I ran this command sudo find / -type d -name '*Trash*' | sudo xargs du -h | sort This was the output: 100M /root/.local/share/Trash/files/recup_dir.2.30 100M /root/.local/share/Trash/files/recup_dir.2.72 100M /root/.local/share/Trash/files/recup_dir.32 101M /root/.local/share/Trash/files/recup_dir.2.27 101M /root/.local/share/Trash/files/recup_dir.29 103M /root/.local/share/Trash/files/recup_dir.2.7 103M /root/.local/share/Trash/files/recup_dir.9 103M /root/.local/share/Trash/files/recup_dir.93 106M /root/.local/share/Trash/files/recup_dir.187 106M /root/.local/share/Trash/files/recup_dir.71 107M /root/.local/share/Trash/files/recup_dir.131 107M /root/.local/share/Trash/files/recup_dir.136 107M /root/.local/share/Trash/files/recup_dir.2.46 107M /root/.local/share/Trash/files/recup_dir.51 108M /root/.local/share/Trash/files/recup_dir.106 108M /root/.local/share/Trash/files/recup_dir.2.78 108M /root/.local/share/Trash/files/recup_dir.52 109M /root/.local/share/Trash/files/recup_dir.2.32 109M /root/.local/share/Trash/files/recup_dir.34 110M /root/.local/share/Trash/files/recup_dir.2.28 110M /root/.local/share/Trash/files/recup_dir.2.53 110M /root/.local/share/Trash/files/recup_dir.30 110M /root/.local/share/Trash/files/recup_dir.55 110M /root/.local/share/Trash/files/recup_dir.89 112M /root/.local/share/Trash/files/recup_dir.2.31 112M /root/.local/share/Trash/files/recup_dir.33 114M /root/.local/share/Trash/files/recup_dir.2.29 114M /root/.local/share/Trash/files/recup_dir.2.74 114M /root/.local/share/Trash/files/recup_dir.31 115M /root/.local/share/Trash/files/recup_dir.125 117M /root/.local/share/Trash/files/recup_dir.83 118M /root/.local/share/Trash/files/recup_dir.105 118M /root/.local/share/Trash/files/recup_dir.2.70 119M /root/.local/share/Trash/files/recup_dir.133 1.1G /root/.local/share/Trash/files/recup_dir.148 11M /root/.local/share/Trash/files/recup_dir.179 1.1M /root/.local/share/Trash/info 122M /root/.local/share/Trash/files/recup_dir.80 124M /root/.local/share/Trash/files/recup_dir.137 125G /root/.local/share/Trash 125G /root/.local/share/Trash/files 125M /root/.local/share/Trash/files/recup_dir.2.49 129M /root/.local/share/Trash/files/recup_dir.153 1.2G /root/.local/share/Trash/files/recup_dir.165 1.2G /root/.local/share/Trash/files/recup_dir.166 12K /media/A80E1DE60E1DAE76/.Trash-1000/files 12M /root/.local/share/Trash/files/recup_dir.178 12M /root/.local/share/Trash/files/recup_dir.180 12M /root/.local/share/Trash/files/recup_dir.181 130M /root/.local/share/Trash/files/recup_dir.85 137M /root/.local/share/Trash/files/recup_dir.2.5 137M /root/.local/share/Trash/files/recup_dir.7 137M /root/.local/share/Trash/files/recup_dir.76 13M /root/.local/share/Trash/files/recup_dir.143 13M /root/.local/share/Trash/files/recup_dir.18 13M /root/.local/share/Trash/files/recup_dir.182 13M /root/.local/share/Trash/files/recup_dir.2.16 13M /root/.local/share/Trash/files/recup_dir.2.2 13M /root/.local/share/Trash/files/recup_dir.4 140M /root/.local/share/Trash/files/recup_dir.2.77 145M /root/.local/share/Trash/files/recup_dir.2.63 147M /root/.local/share/Trash/files/recup_dir.2.43 147M /root/.local/share/Trash/files/recup_dir.45 148M /root/.local/share/Trash/files/recup_dir.84 149M /root/.local/share/Trash/files/recup_dir.160 149M /root/.local/share/Trash/files/recup_dir.2.79 1.4G /root/.local/share/Trash/files/recup_dir.191 150M /root/.local/share/Trash/files/recup_dir.2.26 150M /root/.local/share/Trash/files/recup_dir.28 153M /root/.local/share/Trash/files/recup_dir.64 153M /root/.local/share/Trash/files/recup_dir.78 154M /root/.local/share/Trash/files/recup_dir.107 155M /root/.local/share/Trash/files/recup_dir.2.80 155M /root/.local/share/Trash/files/recup_dir.79 15M /root/.local/share/Trash/files/recup_dir.151 162M /root/.local/share/Trash/files/recup_dir.65 163M /root/.local/share/Trash/files/recup_dir.82 164M /root/.local/share/Trash/files/recup_dir.104 165M /root/.local/share/Trash/files/recup_dir.2.39 165M /root/.local/share/Trash/files/recup_dir.41 168M /root/.local/share/Trash/files/recup_dir.2.62 16M /root/.local/share/Trash/files/recup_dir.171 170M /root/.local/share/Trash/files/recup_dir.135 170M /root/.local/share/Trash/files/recup_dir.159 171M /root/.local/share/Trash/files/recup_dir.91 172M /root/.local/share/Trash/files/recup_dir.2.41 172M /root/.local/share/Trash/files/recup_dir.43 175M /root/.local/share/Trash/files/recup_dir.2.33 175M /root/.local/share/Trash/files/recup_dir.35 176M /root/.local/share/Trash/files/recup_dir.2.76 179M /root/.local/share/Trash/files/recup_dir.2.38 179M /root/.local/share/Trash/files/recup_dir.40 179M /root/.local/share/Trash/files/recup_dir.61 1.7G /root/.local/share/Trash/files/recup_dir.167 17M /root/.local/share/Trash/files/recup_dir.172 180M /root/.local/share/Trash/files/recup_dir.186 181M /root/.local/share/Trash/files/recup_dir.2.71 182M /root/.local/share/Trash/files/recup_dir.158 183M /root/.local/share/Trash/files/recup_dir.2.59 185M /root/.local/share/Trash/files/recup_dir.123 189M /root/.local/share/Trash/files/recup_dir.92 18M /root/.local/share/Trash/files/recup_dir.142 18M /root/.local/share/Trash/files/recup_dir.149 18M /root/.local/share/Trash/files/recup_dir.150 18M /root/.local/share/Trash/files/recup_dir.152 18M /root/.local/share/Trash/files/recup_dir.173 18M /root/.local/share/Trash/files/recup_dir.177 191M /root/.local/share/Trash/files/recup_dir.147 193M /root/.local/share/Trash/files/recup_dir.102 195M /root/.local/share/Trash/files/recup_dir.73 196M /root/.local/share/Trash/files/recup_dir.94 198M /root/.local/share/Trash/files/recup_dir.2.58 19M /root/.local/share/Trash/files/recup_dir.175 19M /root/.local/share/Trash/files/recup_dir.176 205M /root/.local/share/Trash/files/recup_dir.108 206M /root/.local/share/Trash/files/recup_dir.56 206M /root/.local/share/Trash/files/recup_dir.60 207M /root/.local/share/Trash/files/recup_dir.2.55 209M /root/.local/share/Trash/files/recup_dir.90 2.0G /root/.local/share/Trash/files/recup_dir.190 20K /media/A80E1DE60E1DAE76/.Trash-1000/info 20M /root/.local/share/Trash/files/recup_dir.17 20M /root/.local/share/Trash/files/recup_dir.2.15 210M /root/.local/share/Trash/files/recup_dir.121 211M /root/.local/share/Trash/files/recup_dir.134 212M /root/.local/share/Trash/files/recup_dir.57 21M /root/.local/share/Trash/files/recup_dir.174 223M /root/.local/share/Trash/files/recup_dir.88 225M /root/.local/share/Trash/files/recup_dir.118 230M /root/.local/share/Trash/files/recup_dir.87 232M /root/.local/share/Trash/files/recup_dir.66 235M /root/.local/share/Trash/files/recup_dir.139 236M /root/.local/share/Trash/files/recup_dir.97 238M /root/.local/share/Trash/files/recup_dir.2.54 240M /root/.local/share/Trash/files/recup_dir.163 241M /root/.local/share/Trash/files/recup_dir.126 242M /root/.local/share/Trash/files/recup_dir.2.81 243M /root/.local/share/Trash/files/recup_dir.156 244M /root/.local/share/Trash/files/recup_dir.2.37 244M /root/.local/share/Trash/files/recup_dir.39 248M /root/.local/share/Trash/files/recup_dir.110 249M /root/.local/share/Trash/files/recup_dir.75 256M /root/.local/share/Trash/files/recup_dir.2.73 257M /root/.local/share/Trash/files/recup_dir.2.64 25M /root/.local/share/Trash/files/recup_dir.10 25M /root/.local/share/Trash/files/recup_dir.2.8 262M /root/.local/share/Trash/files/recup_dir.86 266M /root/.local/share/Trash/files/recup_dir.144 27M /root/.local/share/Trash/files/recup_dir.99 282M /root/.local/share/Trash/files/recup_dir.127 29M /root/.local/share/Trash/files/recup_dir.183 29M /root/.local/share/Trash/files/recup_dir.22 29M /root/.local/share/Trash/files/recup_dir.2.20 316M /root/.local/share/Trash/files/recup_dir.124 31M /root/.local/share/Trash/files/recup_dir.2.21 31M /root/.local/share/Trash/files/recup_dir.23 320M /root/.local/share/Trash/files/recup_dir.168 32M /root/.local/share/Trash/files/recup_dir.12 32M /root/.local/share/Trash/files/recup_dir.2.10 334M /root/.local/share/Trash/files/recup_dir.140 338M /root/.local/share/Trash/files/recup_dir.69 33M /root/.local/share/Trash/files/recup_dir.21 33M /root/.local/share/Trash/files/recup_dir.2.19 340M /root/.local/share/Trash/files/recup_dir.2.57 341M /root/.local/share/Trash/files/recup_dir.185 342M /root/.local/share/Trash/files/recup_dir.169 343M /root/.local/share/Trash/files/recup_dir.129 346M /root/.local/share/Trash/files/recup_dir.111 348M /root/.local/share/Trash/files/recup_dir.103 351M /root/.local/share/Trash/files/recup_dir.2.34 351M /root/.local/share/Trash/files/recup_dir.36 352M /root/.local/share/Trash/files/recup_dir.155 358M /root/.local/share/Trash/files/recup_dir.59 36G /root/.local/share/Trash/files/recup_dir.1 36G /root/.local/share/Trash/files/recup_dir.2 36M /root/.local/share/Trash/files/recup_dir.120 36M /root/.local/share/Trash/files/recup_dir.2.24 36M /root/.local/share/Trash/files/recup_dir.2.51 36M /root/.local/share/Trash/files/recup_dir.26 37M /root/.local/share/Trash/files/recup_dir.112 390M /root/.local/share/Trash/files/recup_dir.162 398M /root/.local/share/Trash/files/recup_dir.2.67 39M /root/.local/share/Trash/files/recup_dir.145 401M /root/.local/share/Trash/files/recup_dir.2.52 402M /root/.local/share/Trash/files/recup_dir.54 408M /root/.local/share/Trash/files/recup_dir.2.40 408M /root/.local/share/Trash/files/recup_dir.42 4.0K /home/daniel/.local/share/Trash 40K /media/A80E1DE60E1DAE76/.Trash-1000 41M /root/.local/share/Trash/files/recup_dir.13 41M /root/.local/share/Trash/files/recup_dir.2.11 428M /root/.local/share/Trash/files/recup_dir.2.61 434M /root/.local/share/Trash/files/recup_dir.2.36 434M /root/.local/share/Trash/files/recup_dir.38 43M /root/.local/share/Trash/files/recup_dir.19 43M /root/.local/share/Trash/files/recup_dir.2.17 43M /root/.local/share/Trash/files/recup_dir.53 440M /root/.local/share/Trash/files/recup_dir.157 448M /root/.local/share/Trash/files/recup_dir.2.35 448M /root/.local/share/Trash/files/recup_dir.37 44M /root/.local/share/Trash/files/recup_dir.20 44M /root/.local/share/Trash/files/recup_dir.2.18 454M /root/.local/share/Trash/files/recup_dir.116 47M /root/.local/share/Trash/files/recup_dir.11 47M /root/.local/share/Trash/files/recup_dir.2.9 48M /root/.local/share/Trash/files/recup_dir.2.48 495M /root/.local/share/Trash/files/recup_dir.192 49M /root/.local/share/Trash/files/recup_dir.114 49M /root/.local/share/Trash/files/recup_dir.50 52M /root/.local/share/Trash/files/recup_dir.3 538M /root/.local/share/Trash/files/recup_dir.2.68 53M /root/.local/share/Trash/files/recup_dir.95 54M /root/.local/share/Trash/files/recup_dir.98 551M /root/.local/share/Trash/files/recup_dir.63 57M /root/.local/share/Trash/files/recup_dir.101 5.7M /root/.local/share/Trash/files/recup_dir.119 57M /root/.local/share/Trash/files/recup_dir.14 57M /root/.local/share/Trash/files/recup_dir.2.12 581M /root/.local/share/Trash/files/recup_dir.70 586M /root/.local/share/Trash/files/recup_dir.170 588M /root/.local/share/Trash/files/recup_dir.62 58M /root/.local/share/Trash/files/recup_dir.2.4 58M /root/.local/share/Trash/files/recup_dir.2.42 58M /root/.local/share/Trash/files/recup_dir.44 58M /root/.local/share/Trash/files/recup_dir.6 59M /root/.local/share/Trash/files/recup_dir.2.22 59M /root/.local/share/Trash/files/recup_dir.24 603M /root/.local/share/Trash/files/recup_dir.109 60M /root/.local/share/Trash/files/recup_dir.15 60M /root/.local/share/Trash/files/recup_dir.2.13 619M /root/.local/share/Trash/files/recup_dir.154 61M /root/.local/share/Trash/files/recup_dir.2.23 61M /root/.local/share/Trash/files/recup_dir.25 626M /root/.local/share/Trash/files/recup_dir.138 62M /root/.local/share/Trash/files/recup_dir.2.3 62M /root/.local/share/Trash/files/recup_dir.5 63M /root/.local/share/Trash/files/recup_dir.188 64M /root/.local/share/Trash/files/recup_dir.2.1 65M /root/.local/share/Trash/files/recup_dir.113 65M /root/.local/share/Trash/files/recup_dir.146 69M /root/.local/share/Trash/files/recup_dir.122 701M /root/.local/share/Trash/files/recup_dir.2.60 71M /root/.local/share/Trash/files/recup_dir.130 71M /root/.local/share/Trash/files/recup_dir.141 72M /root/.local/share/Trash/files/recup_dir.132 72M /root/.local/share/Trash/files/recup_dir.2.47 74M /root/.local/share/Trash/files/recup_dir.16 74M /root/.local/share/Trash/files/recup_dir.2.14 74M /root/.local/share/Trash/files/recup_dir.2.25 74M /root/.local/share/Trash/files/recup_dir.2.45 74M /root/.local/share/Trash/files/recup_dir.27 74M /root/.local/share/Trash/files/recup_dir.47 751M /root/.local/share/Trash/files/recup_dir.164 752M /root/.local/share/Trash/files/recup_dir.128 76M /root/.local/share/Trash/files/recup_dir.49 77M /root/.local/share/Trash/files/recup_dir.115 77M /root/.local/share/Trash/files/recup_dir.77 8.0K /media/A80E1DE60E1DAE76/.Trash-1000/expunged 810M /root/.local/share/Trash/files/recup_dir.58 815M /root/.local/share/Trash/files/recup_dir.2.66 818M /root/.local/share/Trash/files/recup_dir.2.56 82M /root/.local/share/Trash/files/recup_dir.2.44 82M /root/.local/share/Trash/files/recup_dir.46 835M /root/.local/share/Trash/files/recup_dir.68 84M /root/.local/share/Trash/files/recup_dir.189 860M /root/.local/share/Trash/files/recup_dir.161 86M /root/.local/share/Trash/files/recup_dir.117 86M /root/.local/share/Trash/files/recup_dir.2.69 86M /root/.local/share/Trash/files/recup_dir.2.75 90M /root/.local/share/Trash/files/recup_dir.74 924M /root/.local/share/Trash/files/recup_dir.184 94M /root/.local/share/Trash/files/recup_dir.81 95M /root/.local/share/Trash/files/recup_dir.100 96M /root/.local/share/Trash/files/recup_dir.2.6 96M /root/.local/share/Trash/files/recup_dir.2.65 96M /root/.local/share/Trash/files/recup_dir.8 97M /root/.local/share/Trash/files/recup_dir.2.50 97M /root/.local/share/Trash/files/recup_dir.67 97M /root/.local/share/Trash/files/recup_dir.72 98M /root/.local/share/Trash/files/recup_dir.96 99M /root/.local/share/Trash/files/recup_dir.48 How do I delete these files?

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• ubuntu 10.10 does not recognize usb sticks and drives

  - by Peter

  When connecting any usb stick to my thinkpad ubuntu 10.10 does not recognize them. I don't see anything on the desktop. the output of "dmesg | tail -n10" gives me: [ 1965.696388] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1965.884537] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.072503] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.260349] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.506227] usb 1-1: new high speed USB device using ehci_hcd and address 9 [ 1966.572375] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.760379] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.948358] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1967.136335] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1967.325423] hub 1-0:1.0: unable to enumerate USB device on port 1 When connecting my usb scanner to the same port: [ 2008.480135] usb 1-1: new high speed USB device using ehci_hcd and address 65 [ 2008.548389] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2008.736786] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2008.924379] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2009.112348] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2009.300443] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2009.488536] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2009.732180] usb 1-1: new high speed USB device using ehci_hcd and address 71 [ 2014.796299] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2018.000128] usb 2-1: new full speed USB device using uhci_hcd and address 3 And ubuntu 10.10 recognizes that scanner. So: What can i do to see my usb stick? BTW: on my other Thinkpad running fedora 14 it works perfectly... Cheers -Peter

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• Code Reuse is (Damn) Hard

  - by James Michael Hare

  Being a development team lead, the task of interviewing new candidates was part of my job.  Like any typical interview, we started with some easy questions to get them warmed up and help calm their nerves before hitting the hard stuff. One of those easier questions was almost always: “Name some benefits of object-oriented development.”  Nearly every time, the candidate would chime in with a plethora of canned answers which typically included: “it helps ease code reuse.”  Of course, this is a gross oversimplification.  Tools only ease reuse, its developers that ultimately can cause code to be reusable or not, regardless of the language or methodology. But it did get me thinking…  we always used to say that as part of our mantra as to why Object-Oriented Programming was so great.  With polymorphism, inheritance, encapsulation, etc. we in essence set up the concepts to help facilitate reuse as much as possible.  And yes, as a developer now of many years, I unquestionably held that belief for ages before it really struck me how my views on reuse have jaded over the years.  In fact, in many ways Agile rightly eschews reuse as taking a backseat to developing what's needed for the here and now.  It used to be I was in complete opposition to that view, but more and more I've come to see the logic in it.  Too many times I've seen developers (myself included) get lost in design paralysis trying to come up with the perfect abstraction that would stand all time.  Nearly without fail, all of these pieces of code become obsolete in a matter of months or years. It’s not that I don’t like reuse – it’s just that reuse is hard.  In fact, reuse is DAMN hard.  Many times it is just a distraction that eats up architect and developer time, and worse yet can be counter-productive and force wrong decisions.  Now don’t get me wrong, I love the idea of reusable code when it makes sense.  These are in the few cases where you are designing something that is inherently reusable.  The problem is, most business-class code is inherently unfit for reuse! Furthermore, the code that is reusable will often fail to be reused if you don’t have the proper framework in place for effective reuse that includes standardized versioning, building, releasing, and documenting the components.  That should always be standard across the board when promoting reusable code.  All of this is hard, and it should only be done when you have code that is truly reusable or you will be exerting a large amount of development effort for very little bang for your buck. But my goal here is not to get into how to reuse (that is a topic unto itself) but what should be reused.  First, let’s look at an extension method.  There’s many times where I want to kick off a thread to handle a task, then when I want to reign that thread in of course I want to do a Join on it.  But what if I only want to wait a limited amount of time and then Abort?  Well, I could of course write that logic out by hand each time, but it seemed like a great extension method: 1: public static class ThreadExtensions 2: { 3: public static bool JoinOrAbort(this Thread thread, TimeSpan timeToWait) 4: { 5: bool isJoined = false; 6:  7: if (thread != null) 8: { 9: isJoined = thread.Join(timeToWait); 10:  11: if (!isJoined) 12: { 13: thread.Abort(); 14: } 15: } 16: return isJoined; 17: } 18: } 19:  When I look at this code, I can immediately see things that jump out at me as reasons why this code is very reusable.  Some of them are standard OO principles, and some are kind-of home grown litmus tests: Single Responsibility Principle (SRP) – The only reason this extension method need change is if the Thread class itself changes (one responsibility). Stable Dependencies Principle (SDP) – This method only depends on classes that are more stable than it is (System.Threading.Thread), and in itself is very stable, hence other classes may safely depend on it. It is also not dependent on any business domain, and thus isn't subject to changes as the business itself changes. Open-Closed Principle (OCP) – This class is inherently closed to change. Small and Stable Problem Domain – This method only cares about System.Threading.Thread. All-or-None Usage – A user of a reusable class should want the functionality of that class, not parts of that functionality.  That’s not to say they most use every method, but they shouldn’t be using a method just to get half of its result. Cost of Reuse vs. Cost to Recreate – since this class is highly stable and minimally complex, we can offer it up for reuse very cheaply by promoting it as “ready-to-go” and already unit tested (important!) and available through a standard release cycle (very important!). Okay, all seems good there, now lets look at an entity and DAO.  I don’t know about you all, but there have been times I’ve been in organizations that get the grand idea that all DAOs and entities should be standardized and shared.  While this may work for small or static organizations, it’s near ludicrous for anything large or volatile. 1: namespace Shared.Entities 2: { 3: public class Account 4: { 5: public int Id { get; set; } 6:  7: public string Name { get; set; } 8:  9: public Address HomeAddress { get; set; } 10:  11: public int Age { get; set;} 12:  13: public DateTime LastUsed { get; set; } 14:  15: // etc, etc, etc... 16: } 17: } 18:  19: ... 20:  21: namespace Shared.DataAccess 22: { 23: public class AccountDao 24: { 25: public Account FindAccount(int id) 26: { 27: // dao logic to query and return account 28: } 29:  30: ... 31:  32: } 33: } Now to be fair, I’m not saying there doesn’t exist an organization where some entites may be extremely static and unchanging.  But at best such entities and DAOs will be problematic cases of reuse.  Let’s examine those same tests: Single Responsibility Principle (SRP) – The reasons to change for these classes will be strongly dependent on what the definition of the account is which can change over time and may have multiple influences depending on the number of systems an account can cover. Stable Dependencies Principle (SDP) – This method depends on the data model beneath itself which also is largely dependent on the business definition of an account which can be very inherently unstable. Open-Closed Principle (OCP) – This class is not really closed for modification.  Every time the account definition may change, you’d need to modify this class. Small and Stable Problem Domain – The definition of an account is inherently unstable and in fact may be very large.  What if you are designing a system that aggregates account information from several sources? All-or-None Usage – What if your view of the account encompasses data from 3 different sources but you only care about one of those sources or one piece of data?  Should you have to take the hit of looking up all the other data?  On the other hand, should you have ten different methods returning portions of data in chunks people tend to ask for?  Neither is really a great solution. Cost of Reuse vs. Cost to Recreate – DAOs are really trivial to rewrite, and unless your definition of an account is EXTREMELY stable, the cost to promote, support, and release a reusable account entity and DAO are usually far higher than the cost to recreate as needed. It’s no accident that my case for reuse was a utility class and my case for non-reuse was an entity/DAO.  In general, the smaller and more stable an abstraction is, the higher its level of reuse.  When I became the lead of the Shared Components Committee at my workplace, one of the original goals we looked at satisfying was to find (or create), version, release, and promote a shared library of common utility classes, frameworks, and data access objects.  Now, of course, many of you will point to nHibernate and Entity for the latter, but we were looking at larger, macro collections of data that span multiple data sources of varying types (databases, web services, etc). As we got deeper and deeper in the details of how to manage and release these items, it quickly became apparent that while the case for reuse was typically a slam dunk for utilities and frameworks, the data access objects just didn’t “smell” right.  We ended up having session after session of design meetings to try and find the right way to share these data access components. When someone asked me why it was taking so long to iron out the shared entities, my response was quite simple, “Reuse is hard...”  And that’s when I realized, that while reuse is an awesome goal and we should strive to make code maintainable, often times you end up creating far more work for yourself than necessary by trying to force code to be reusable that inherently isn’t. Think about classes the times you’ve worked in a company where in the design session people fight over the best way to implement a class to make it maximally reusable, extensible, and any other buzzwordable.  Then think about how quickly that design became obsolete.  Many times I set out to do a project and think, “yes, this is the best design, I can extend it easily!” only to find out the business requirements change COMPLETELY in such a way that the design is rendered invalid.  Code, in general, tends to rust and age over time.  As such, writing reusable code can often be difficult and many times ends up being a futile exercise and worse yet, sometimes makes the code harder to maintain because it obfuscates the design in the name of extensibility or reusability. So what do I think are reusable components? Generic Utility classes – these tend to be small classes that assist in a task and have no business context whatsoever. Implementation Abstraction Frameworks – home-grown frameworks that try to isolate changes to third party products you may be depending on (like writing a messaging abstraction layer for publishing/subscribing that is independent of whether you use JMS, MSMQ, etc). Simplification and Uniformity Frameworks – To some extent this is similar to an abstraction framework, but there may be one chosen provider but a development shop mandate to perform certain complex items in a certain way.  Or, perhaps to simplify and dumb-down a complex task for the average developer (such as implementing a particular development-shop’s method of encryption). And what are less reusable? Application and Business Layers – tend to fluctuate a lot as requirements change and new features are added, so tend to be an unstable dependency.  May be reused across applications but also very volatile. Entities and Data Access Layers – these tend to be tuned to the scope of the application, so reusing them can be hard unless the abstract is very stable. So what’s the big lesson?  Reuse is hard.  In fact it’s damn hard.  And much of the time I’m not convinced we should focus too hard on it. If you’re designing a utility or framework, then by all means design it for reuse.  But you most also really set down a good versioning, release, and documentation process to maximize your chances.  For anything else, design it to be maintainable and extendable, but don’t waste the effort on reusability for something that most likely will be obsolete in a year or two anyway.

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• Oracle OpenWorld Countdown Begins

  - by Michelle Kimihira

  Oracle OpenWorld is a little over 3 weeks away and it is bigger than ever!  We are very excited to meet with you and share our exciting innovations around Oracle Fusion Middleware. To help you navigate, there will be a series of blogs to help you make the most out of the event. Thomas Kurian, Executive Vice President, Product Development will be delivering his keynote, “The Oracle Cloud: Oracle’s Cloud Platform and Applications Strategy” on Tuesday, October 2 at 8:00 AM – 9:45 AM in Moscone North, Hall D. Be sure to attend this session and gain insight on how Oracle’s complete suite of cloud applications are transforming how customers manage their businesses. Here are the top 5 Oracle Fusion Middleware General Sessions you don’t want to miss: Monday, 10/1 10:45 AM – 11:45 AM GEN9504 - General Session: Innovation Platform for Oracle Apps, Including Fusion Applications Amit Zavery, Vice President, Fusion Middleware Product Management Moscone West, 3002/3004 Monday, 10/1 1:45PM – 2:45 PM GEN11554 – General Session: Extend Oracle Applications to Mobile Devices with Oracle’s Mobile Technologies Moscone West, 3002/3004 Monday, 10/1 4:45 PM – 5:45 PM GEN11422 – General Session: Building and Managing a Private Oracle Java and Middleware Cloud Moscone West, 3014 Tuesday, 10/2 10:15 AM – 11:15 AM GEN9394 - General Session: Oracle Fusion Middleware Strategies Driving Business Innovation Hassan Rizvi, Executive Vice President of Product Development Moscone North, Hall D Tuesday, 10/2 11:45 AM – 12:45AM CON9162 – Oracle Fusion Middleware: Meet This Year’s Most Impressive Customer Projects Moscone West, 3001 Here is what else you can expect to see on the Oracle Fusion Middleware Blog leading up to Oracle OpenWorld 2012. §  Week of 10-14 September: Best of Oracle Fusion Middleware and Oracle Fusion Middleware for Enterprise Applications §  Week of 17-21 September: What to expect in Hassan Rizvi’s (Executive Vice President of Product Development) and Amit Zavery’s (Vice President of Product Management) sessions §  Week of 24-28 September: All Things Mobile and Fusion Middleware Lineup

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• using cin and cout in textmate [migrated]

  - by That Guy

  I am usually a Java programmer, and have used textmate for that almost exclusively, but lately I started using C++ with it. but when i use even the most basic programs and incorporate the cin keyword, and run the program, I dont get an oppurtunity to put in anything during runtime and sometimes it inserts random values by itself! for example, if i ran this in textmate: #include <iostream> int stonetolb(int); int main() { using namespace std; int stone; cout << "enter the weight in stone"; cin >> stone; int pounds = stonetolb(stone); cout << stone << "stone = "; cout << pounds <<" pounds."; return 0; } int stonetolb(int sts) { return 14 * sts; } I would come out with the output: enter the weight in stone32767stone = 458738 pounds. Why is this happening, and how do I stop it?

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• Issue 55 - Skin Object Tokens, Optimized Control Panel, OWS Validation and Security, RAD

  April 2010 Welcome to Issue 55 of DNN Creative Magazine In this issue we focus on the new Skin Object token method introduced in DotNetNuke 5 for adding tokens into a DotNetNuke skin. A Skin Object Token is a web user control which covers skin elements such as the logo, menu, search, login links, date, copyright, languages, links, banners, privacy, terms of use, etc. Following this we demonstrate how to install and use two Advanced DotNetNuke Admin Control Panels which are available for free from Oliver Hine. These control panels provide an optimized version of the admin control panel to improve performance and page load times, as well as a ribbon bar control panel which adds additional features. Next, we continue the Open Web Studio tutorials, this month we demonstrate some very advanced techniques for building a car parts application in Open Web Studio. Throughout the tutorial we cover form input, validation, how to use dependant drop down lists, populating checkbox lists and introduce a new concept of data level security. Data level security allows you to control which data a user can access within a module. To finish, we have part five of the "How to Build a News Application with DotNetMushroom Rapid Application Developer (RAD)" article, where we demonstrate how to implement paging. This issue comes complete with 14 videos. Skinning: Skin Object Tokens for DotNetNuke 5 (8 videos - 64mins) Free Module: Advanced Optimized Control Panel by Oliver Hine (1 video - 11mins) Module Development Series: Form Validation, Dependant Drop Downs and Data Level Security in OWS (5 videos - 44mins) How to Implement Paging with DotNetMushroom RAD View issue 55 to download all of the videos in one zip file DNN Creative Magazine for DotNetNuke Web Designers Covering DotNetNuke module video reviews, video tutorials, mp3 interviews, resources and web design tips for working with DotNetNuke. In 55 issues we have created 563 videos!Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How do I align my partition table properly?

  - by Jorge Castro

  I am in the process of building my first RAID5 array. I've used mdadm to create the following set up: root@bondigas:~# mdadm --detail /dev/md1 /dev/md1: Version : 00.90 Creation Time : Wed Oct 20 20:00:41 2010 Raid Level : raid5 Array Size : 5860543488 (5589.05 GiB 6001.20 GB) Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Wed Oct 20 20:13:48 2010 State : clean, degraded, recovering Active Devices : 3 Working Devices : 4 Failed Devices : 0 Spare Devices : 1 Layout : left-symmetric Chunk Size : 64K Rebuild Status : 1% complete UUID : f6dc829e:aa29b476:edd1ef19:85032322 (local to host bondigas) Events : 0.12 Number Major Minor RaidDevice State 0 8 16 0 active sync /dev/sdb 1 8 32 1 active sync /dev/sdc 2 8 48 2 active sync /dev/sdd 4 8 64 3 spare rebuilding /dev/sde While that's going I decided to format the beast with the following command: root@bondigas:~# mkfs.ext4 /dev/md1p1 mke2fs 1.41.11 (14-Mar-2010) /dev/md1p1 alignment is offset by 63488 bytes. This may result in very poor performance, (re)-partitioning suggested. Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=16 blocks, Stripe width=48 blocks 97853440 inodes, 391394047 blocks 19569702 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=0 11945 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 102400000, 214990848 Writing inode tables: ^C 27/11945 root@bondigas:~# ^C I am unsure what to do about "/dev/md1p1 alignment is offset by 63488 bytes." and how to properly partition the disks to match so I can format it properly.

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• Slow dvd burning/reading speeds: how to solve

  - by wouter205

  I have a problem on which I'm struggling since i started using linux a year ago on my desktop, but still haven't found a solution for it. When reading or burning a dvd, the speeds are very slow (mostly under 1x) whilst I did selected the fastest speed in k3b. As such, it takes up to 40-50 minutes to burn one dvd! I read about enabling dma this post but it didn't help. This is the output for dmesg | grep -i dma > [ 0.000000] DMA 0x00000010 -> 0x00001000 [ 0.000000] DMA32 0x00001000 -> 0x00100000 [ 0.000000] DMA zone: 56 pages used for memmap [ 0.000000] DMA zone: 5 pages reserved [ 0.000000] DMA zone: 3921 pages, LIFO batch:0 [ 0.000000] DMA32 zone: 3527 pages used for memmap [ 0.000000] DMA32 zone: 254441 pages, LIFO batch:31 [ 0.000000] Policy zone: DMA32 [ 0.120356] pnp 00:01: [dma 4] [ 0.120968] pnp 00:05: [dma 2] [ 0.121421] pnp 00:06: [dma 3] [ 0.122617] pnp 00:0b: [dma 0 disabled] [ 0.852321] ata1: SATA max UDMA/133 cmd 0xec00 ctl 0xe480 bmdma 0xe000 irq 19 [ 0.852325] ata2: SATA max UDMA/133 cmd 0xe400 ctl 0xe080 bmdma 0xe008 irq 19 [ 0.861633] ata3: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xff00 irq 14 [ 0.861636] ata4: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xff08 irq 15 [ 1.329411] ata1.00: ATA-7: Maxtor 6V250F0, VA111630, max UDMA/133 [ 1.345418] ata1.00: configured for UDMA/133 [ 1.820606] ata4.00: ATAPI: PHILIPS DVDR1660P1, P1.3, max UDMA/33 [ 1.820610] ata4.00: WARNING: ATAPI DMA disabled for reliability issues. It can be enabled [ 1.820613] ata4.00: WARNING: via pata_ali.atapi_dma modparam or corresponding sysfs node. [ 1.836681] ata4.00: configured for UDMA/33 [ 12.296600] parport0: PC-style at 0x378 (0x778), irq 7, dma 3 [PCSPP,TRISTATE,COMPAT,EPP,ECP,DMA] reading the third and fourth last line, I assume there is indeed a problem with dma? edit: this question still is not solved. Could anyone come up with an other solution please? Thanks

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