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• Two parts: linux startup script to connect to bluetooth and cron to keep it connected

  - by D.R.

  I have a mini bluetooth keyboard and a Raspberry Pi running a Debian-based distro. I know the MAC address of the keyboard but for this question, let's just use AA:BB:CC:DD:EE:FF. Right now I have to have a wired keyboard connected as well as my bluetooth dongle for the mini-keyboard and on the wired keyboard, I have to run the following when the device boots up: sudo hidd --connect AA:BB:CC:DD:EE:FF If the device goes idle for too long, then the bluetooth disconnects and I have to pull out my wired keyboard and retype that same command. What I'm looking for it a way to have that command run at startup and a way to sense if it gets disconnected so that it will auto reconnect. The annoying thing is that they keyboard has to be in pairing mode (even though it has already been paired) when I run that command, otherwise it tells me the host is down. So perhaps the script needs to prevent it from disconnecting due to inactivity, otherwise I'll have to put it back in pairing mode to reconnect. So to recap: - A script to connect at startup (I can make sure to put the keyboard into pairing mode before turning it on) - A script to prevent it from disconnecting (maybe some sort of signal to send to it every 60 seconds or something?) Any help with this is greatly appreciated! StackOverflow is always the best place to find answers to weird questions! I've been searching long and hard for an answer, but finally had to resort to coming here! Thanks!

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• Can enabling a RAID controller's writeback cache harm overall performance?

  - by Nathan O'Sullivan

  I have an 8 drive RAID 10 setup connected to an Adaptec 5805Z, running Centos 5.5 and deadline scheduler. A basic dd read test shows 400mb/sec, and a basic dd write test shows about the same. When I run the two simultaneously, I see the read speed drop to ~5mb/sec while the write speed stays at more or less the same 400mb/sec. The output of iostat -x as you would expect, shows that very few read transactions are being executed while the disk is bombarded with writes. If i turn the controller's writeback cache off, I dont see a 50:50 split but I do see a marked improvement, somewhere around 100mb/s reads and 300mb/s writes. I've also found if I lower the nr_requests setting on the drive's queue (somewhere around 8 seems optimal) I can end up with 150mb/sec reads and 150mb/sec writes; ie. a reduction in total throughput but certainly more suitable for my workload. Is this a real phenomenon? Or is my synthetic test too simplistic? The reason this could happen seems clear enough, when the scheduler switches from reads to writes, it can run heaps of write requests because they all just land in the controllers cache but must be carried out at some point. I would guess the actual disk writes are occuring when the scheduler starts trying to perform reads again, resulting in very few read requests being executed. This seems a reasonable explanation, but it also seems like a massive drawback to using writeback cache on an system with non-trivial write loads. I've been searching for discussions around this all afternoon and found nothing. What am I missing?

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• How to set up multiple SSIDs with bandwidth limiting on a single wireless router?

  - by Rahul Narain

  I have an Asus WL-520GU wireless router connected to a cable modem that I use for wireless internet access in my apartment. I would like to set it up so that it provides two SSIDs: one secured and password-protected for my regular use, and a "guest" SSID that's unsecured but throttled to, say, 10% of the available bandwidth. What is the most straightforward way to do this? I've been looking into DD-WRT and Tomato, both of which support my router. DD-WRT supports setting up multiple SSIDs using the GUI, but I don't know if it's possible to limit the bandwidth of each SSID independently; point #12 in this FAQ thread says it's not possible to limit by day or by MAC address, which is discouraging but not conclusive. Tomato allows bandwidth limits in its QoS settings, going by the screenshot here, but multiple SSID support is still experimental and it doesn't look like it will work with the encryption settings or bandwidth limits in the GUI. I'd like to know a good way to do this which gives me the fewest opportunities for screwing up. I'm no stranger to the command line, if that turns out to be what's necessary, but if so, please explain what the commands are doing because I don't have a good mental model of what needs to happen to set this up.

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• unable to recover data from failed hdd

  - by Eslam Elyamany

  my hdd failing (or maybe totally dead) i've connected the hdd via USB but it doesn't appear in fdisk Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0xe9fb38fb Device Boot Start End Blocks Id System /dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT /dev/sda2 206848 40959999 20376576 7 HPFS/NTFS/exFAT /dev/sda4 40962046 976771071 467904513 5 Extended Partition 4 does not start on physical sector boundary. /dev/sda5 82913280 86910975 1998848 82 Linux swap / Solaris /dev/sda6 86913024 394113023 153600000 7 HPFS/NTFS/exFAT /dev/sda7 40962048 82913279 20975616 83 Linux /dev/sda8 394122708 976768064 291322678+ 7 HPFS/NTFS/exFAT Partition 8 does not start on physical sector boundary. no sdc appears here , BUT it's appears on /dev/ rootghost-lap:/home/ghost# ls /dev/sd* /dev/sda /dev/sda2 /dev/sda5 /dev/sda8 /dev/sdb /dev/sdc1 /dev/sdc2 /dev/sdc6 /dev/sdc8 /dev/sda1 /dev/sda4 /dev/sda6 /dev/sda9 /dev/sdc /dev/sdc10 /dev/sdc5 /dev/sdc7 /dev/sdc9 also it appears in proc Code: rootghost-lap:/home/ghost# cat /proc/partitions major minor #blocks name 8 0 488386584 sda 8 1 102400 sda1 8 2 20376576 sda2 8 4 1 sda4 8 5 1998848 sda5 8 6 153600000 sda6 8 8 291322678 sda8 8 9 20975616 sda9 11 0 1048575 sr0 11 1 99136 sr1 8 32 244198583 sdc 8 33 14651248 sdc1 8 34 1 sdc2 8 37 15380480 sdc5 8 38 4153344 sdc6 8 39 48829536 sdc7 8 40 48829536 sdc8 8 41 110374551 sdc9 8 42 1975963 sdc10 and dmesg : [10604.777168] end_request: I/O error, dev sdc, sector 1 [10604.817238] sd 26:0:0:0: [sdc] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [10604.817243] sd 26:0:0:0: [sdc] Sense Key : Aborted Command [current] [10604.817248] sd 26:0:0:0: [sdc] Add. Sense: No additional sense information [10604.817253] sd 26:0:0:0: [sdc] CDB: Read(10): 28 00 00 00 00 02 00 00 06 00 ok now , let's see what i've tried testdisk to check for partitions -- failed dd to copy data from /dev/sdcX -- provide strange output size for example /dev/sdc1 is about 15G , the output for dd is 62G+ so i had to cancle it safecopy successfully made an image for partitons , but can't fix images, can't mount it, can't do any thing with it and some other tools i've tried and all failed , so any idea ?

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• Understanding !d command in sed with respect to saves

  - by richardh

  I have a directory of tab-delimited text files and some have comments in the first few lines that I would like to delete. I know that the first good line starts with "Mark" so I can use /^Mark/,$!d to delete these comments. After this deletion I have several other replacements that I make in the (new) first line that has variable names. My question is, why do I have to save sed's output to get my script to work? I understand that if I line is deleted, then the output doesn't proceed downstream because there is no output. But if I don't delete (i.e., !d) then why do I have to save to file? Thanks! Here is my shell script. (I'm a sed newbie, so any other feedback is also appreciated.) #!/bin/bash for file in *.txt; do mv $file $file.old1 sed -e '/^Mark/,$!d' $file.old1 > $file.old2 sed -e '1s/\([Ss]\)hareholder/\1hrhldr/g'\ -e '1s/\([Ii]\)mmediate/\1mmdt/g'\ -e '1s/\([Nn]\)umber/\1o/g'\ -e '1s/\([Cc]\)ompany/\1o/g'\ -e '1s/\([Ii]\)nformation/\1nfo/g'\ -e '1s/\([Pp]\)ercentage/\1ct/g'\ -e '1s/\([Dd]\)omestic/\1om/g'\ -e '1s/\([Gg]\)lobal/\1lbl/g'\ -e '1s/\([Cc]\)ountry/\1ntry/g'\ -e '1s/\([Ss]\)ource/\1rc/g'\ -e '1s/\([Oo]\)wnership/\1wnrshp/g'\ -e '1s/\([Uu]\)ltimate/\1ltmt/g'\ -e '1s/\([Ii]\)ncorporation/\1ncorp/g'\ -e '1s/\([Tt]\)otal/\1ot/g'\ -e '1s/\([Dd]\)irect/\1ir/g'\ $file.old2 > $file rm -f $file.old* done

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• Recovering a mdadm+lvm+ext4 partition with read error

  - by bitwelder

  One of disks in my NAS has failed. The NAS is running Linux, and it uses mdadm + LVM technology for its filesystems. I do have backup for most of the contents, but not for the very last changes, and if possible, I'd like to recover that from this failing disk. The disk (a 'green drive' WD10EARS 1TB in size) throws this kind of errors: Oct 3 12:00:41 kernel: [ 3625.620000] ata5.00: read unc at 9453282 Oct 3 12:00:41 kernel: [ 3625.620000] lba 9453282 start 9453280 end 1953511007 Oct 3 12:00:41 kernel: [ 3625.620000] sde5 auto_remap 0 Oct 3 12:00:41 kernel: [ 3625.630000] ata5.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 Oct 3 12:00:41 kernel: [ 3625.630000] ata5.00: edma_err_cause=00000084 pp_flags=00000003, dev error, EDMA self-disable Oct 3 12:00:41 kernel: [ 3625.640000] ata5.00: failed command: READ FPDMA QUEUED Oct 3 12:00:41 kernel: [ 3625.650000] ata5.00: cmd 60/40:00:e0:3e:90/00:00:00:00:00/40 tag 0 ncq 32768 in Oct 3 12:00:41 kernel: [ 3625.650000] res 41/40:00:e2:3e:90/12:00:00:00:00/40 Emask 0x409 (media error) <F> Oct 3 12:00:41 kernel: [ 3625.660000] ata5.00: status: { DRDY ERR } However, while testing with 'dd', I noticed that if I skip the first 4kB, the read seems to be ok, i.e. a command like. dd if=/dev/sde5 of=dev/null bs=4k count=1000 skip=1 doesn't return any read error. Supposing that there is no other read failure in the rest of the disk, would I be able to recover this 900 GB partition (as I mentioned before, it's a 'linux raid autodetect' partition, that contains a a LVM2 volume that contains a ext4 filesystem) if I copy-clone the partition somewhere else, but the first 4kB?

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• Bad performance with Linux software RAID5 and LUKS encryption

  - by Philipp Wendler

  I have set up a Linux software RAID5 on three hard drives and want to encrypt it with cryptsetup/LUKS. My tests showed that the encryption leads to a massive performance decrease that I cannot explain. The RAID5 is able to write 187 MB/s [1] without encryption. With encryption on top of it, write speed is down to about 40 MB/s. The RAID has a chunk size of 512K and a write intent bitmap. I used -c aes-xts-plain -s 512 --align-payload=2048 as the parameters for cryptsetup luksFormat, so the payload should be aligned to 2048 blocks of 512 bytes (i.e., 1MB). cryptsetup luksDump shows a payload offset of 4096. So I think the alignment is correct and fits to the RAID chunk size. The CPU is not the bottleneck, as it has hardware support for AES (aesni_intel). If I write on another drive (an SSD with LVM) that is also encrypted, I do have a write speed of 150 MB/s. top shows that the CPU usage is indeed very low, only the RAID5 xor takes 14%. I also tried putting a filesystem (ext4) directly on the unencrypted RAID so see if the layering is problem. The filesystem decreases the performance a little bit as expected, but by far not that much (write speed varying, but 100 MB/s). Summary: Disks + RAID5: good Disks + RAID5 + ext4: good Disks + RAID5 + encryption: bad SSD + encryption + LVM + ext4: good The read performance is not affected by the encryption, it is 207 MB/s without and 205 MB/s with encryption (also showing that CPU power is not the problem). What can I do to improve the write performance of the encrypted RAID? [1] All speed measurements were done with several runs of dd if=/dev/zero of=DEV bs=100M count=100 (i.e., writing 10G in blocks of 100M). Edit: If this helps: I'm using Ubuntu 11.04 64bit with Linux 2.6.38. Edit2: The performance stays approximately the same if I pass a block size of 4KB, 1MB or 10MB to dd.

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• Backing up a Windos 7 partition from Macbook with no OS X

  - by mattcodes

  I have a 3 year macbook with Windows 7 installed as 40gb and OS X as 40gb (80gb HD). I want to remove OS X as Im at the limit of 40gb on Windows and I have not logged on to Mac OS X since installed Win7 (dont flame me). So I want to delete OS X partition and expand my win partition to 80gb BUT I still would like to be able to regularly (once a week/month) backup my Windows 7 partition - its took a while to setup everything up right - not just docs and programs - so when the hard drive dies I want to be able to restore the partition and boot away, (the daily volatile bits I can pull down from dropbox and project from soure control). With Mac OS X I could use Winclone - and this worked flawless last time the HD failed with XP but with the absence of OS X I will need something else. Im thinking can I use a Linux Live boot CD along with an external USB hard drive. Boot from CD and then dd? the partition to the USB? What linux distro live CD should I use? I say dd as if I know what am taking about (I dont) is this the best way to backup a partition (when it will be restored to same hardware as bootable) ? What command?

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• Trouble getting started with the STEALTH monitoring package

  - by dlanced

  Is anyone here familiar with the Linux-based STEALTH package (for monitoring FS integrity of client systems)? I'm trying to get started with a very simple configuration, but I'm running into trouble (this is running under Ubuntu 14.04): Config line `USE BASE/root/stealth/10.0.0.79' invalid STEALTH (2.11.02) started at Fri, 30 May 2014 15:25:00 +0000 Program terminated due to non-zero exit value for -type f -exec /usr/bin/sha1sum {} \; (EOC Fri May 30 15:25:00 2014 127) Stealth is creating a binary tmp file in the Stealth server root and generating a "report" file in the start directory, but not much else. Regarding the "USE BASE...invalid" error, and just to be sure, I manually created the directories in /root, but it didn't help. And, by the way, I am running stealth with sudo. Everything seems to be configured correctly: I'm able to ssh into root@client from the stealth machine without a password Here's my "policy" file (I've removed the email directives just for simplicity): DEFINE SSHCMD /usr/bin/ssh [email protected] -T -q exec /bin/bash --noprofile DEFINE EXECSHA1 -xdev -perm +u+s,g+s ( -user root -or -group root ) \ -type f -exec /usr/bin/sha1sum {} \; USE BASE/root/stealth/10.0.0.79 USE SSH ${SSHCMD} USE DD /bin/dd USE DIFF /usr/bin/diff USE PIDFILE /var/run/stealth- USE REPORT report USE SH /bin/sh GET /usr/bin/sha1sum /root/tmp LABEL \nchecking the client's /usr/bin/find program CHECK LOG = remote/binfind /usr/bin/sha1sum /usr/bin/find LABEL \nsuid/sgid/executable files uid or gid root on the / partition CHECK LOG = remote/setuidgid /usr/bin/find / ${EXECSHA1} LABEL \nconfiguration files under /etc CHECK LOG = remote/etcfiles \ /usr/bin/find /etc -type f -not -perm /6111 \ -not -regex "/etc/(adjtime\|mtab)"\ -exec /usr/bin/sha1sum {} \; Any ideas? Thanks,

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• Recover file from NTFS after it was formatted twice

  - by Phil

  I'm running Linux Mint and have a 2TB drive that I formatted as NTFS. I copied ~120GB of files from another computer to the 2TB drive, removing the files from the other computer as I did so. When they were all on the 2TB drive, I zipped them up as file "Gold.tar.gz". Then I reformatted the 2TB drive as ext3 in a moment of absolute stupidity. I formatted the 2TB back to NTFS, but of course everything is gone. Here is what I have tried: TestDisk -- won't find any lost partitions or undelete files, just the current empty one PhotoRec -- seems to only find some broken text files and misidentify their extensions. It never finds the 100's of avi files I had (before the 120GB copy, I already had 750GB on the drive full of avi files) or anything else that would show me it's working properly. Using dd I recovered the first 512MB of the drive and went hunting through it. I found all of the file as MFT entries, including the file "Gold.tar.gz" in a 2048 byte MFT record. I'm looking now for some way of either (1) telling PhotoRec to look at that record, or (2) analyze the MFT record myself and discover the sectors holding the data; I can piece it all together using dd and join the binary output if it's fragmented. One last thing - from the moment I got this drive a few days ago to the incident, there were only file copies made to it and no deletes. I formatted as NTFS, then copied thousands of files, then made a tar.gz, then reformatted to ext3, then reformatted to NTFS again. I'm hoping that the size of the drive and fact that there was no file modification/deleting happening makes for minimal file fragmentation.

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• Limit access on Apache 2.4 to ldap group

  - by jakobbg

  I've upgraded from Ubuntu 12.04 LTS to 14.04 LTS, and suddenly, my Apache 2.4 (previous: Apache 2.2) now lets everybody in to my virtual host, which is unfortunate :-). What am I doing wrong? Anything with the Order/Allow lines? Any help is greatly appreciated! Here's my current config; <VirtualHost *:443> DavLockDB /etc/apache2/var/DavLock ServerAdmin [email protected] ServerName foo.mydomain.com DocumentRoot /srv/www/foo Include ssl-vhosts.conf <Directory /srv/www/foo> Order allow,deny Allow from all Dav On Options FollowSymLinks Indexes AllowOverride None AuthBasicProvider ldap AuthType Basic AuthName "Domain foo" AuthLDAPURL "ldap://localhost:389/dc=mydomain,dc=com?uid" NONE AuthLDAPBindDN "cn=searchUser, dc=mydomain, dc=com" AuthLDAPBindPassword "ThisIsThePwd" require ldap-group cn=users,dc=mydomain,dc=com <FilesMatch '^\.[Dd][Ss]_[Ss]'> Order allow,deny Deny from all </FilesMatch> <FilesMatch '\.[Dd][Bb]'> Order allow,deny Deny from all </FilesMatch> </Directory> ErrorLog /var/log/apache2/error-foo.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/access-foo.log combined </VirtualHost>

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• Cant ping ip on LAN. Port forward works fine though.

  - by Anoop

  I have a Solaris 11 machine running inside the LAN. It is a default install. I can access the machine and ping it if I ssh into my router (if it matters, it is running dd-wrt). I cannot ping the Solaris machine using ip address from any other machine inside the LAN. But if I setup port forwarding everything works perfectly fine. I can also use the port forward from outside the LAN (from my office) - which is good and how I want it to be. I can SSH and ping and do pretty much everything else from outside as well as inside but only as long as I have the port forwarded from my router. Why would I not be able to ping or ssh or even access the Solaris 11 machine from within the LAN - I have checked and couldn't find any firewall running on the Solaris 11 box. I even tried disabling every known firewall on the router (dd-wrt, it had something like SPI firewall running). I even tried setting a static IP for my Solaris box but all in vain! Please help me understand how and why this happens!! Thanks.

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• How to back up initial state of external backup drive?

  - by intuited

  I've picked up an HP Simplesave external drive. It comes with some fancy software that is of no use to me because I don't use Windows. Like many current consumer-targeted backup drives, the backup software is actually contained on the drive itself. I'd like to save the drive's initial state so that I can restore it if I decide to sell it. The backup box itself is somewhat customized: in addition to the hard drive device, it presents a CDROM-like device on /dev/sr0. I gather that the purpose of this cdrom device is to bootstrap via Windows autoplay the backup application which lives on the disk itself. I wouldn't suppose any guarantees about how it does this, so it seems important to preserve the exact state of the disk. The drive is formatted with a single 500GB NTFS partition. My initial thought was to use dd to dump the disk (/dev/sdb) itself, but this proved impractical, as the resulting file was not sparse. This seemed to be because the NTFS empty space is not filled with zeroes, but with a repeating series of 16 bytes. I tried gzipping the output of dd. This reduced to the file to a manageable size — the first 18GB was compressed to 81MB, versus 47MB to tarball the contents of the mounted filesystem — but it was very slow on my admittedly somewhat derelict Pentium M processor. The time to do that first 18GB was about 30 minutes. So I've resorted to dumping the disk state and partition data separately. I've dumped the partition state with sfdisk -d /dev/sdb > sfdisk.-d.out I've also created a compressed image of the NTFS partition (the only one on the disk) with ntfsclone --save-image --output - /dev/sdb1 | gzip -c > ntfsclone.img.gz Is there anything else I should do to ensure that I can restore the precise original state of the drive?

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• Why is my rsync so slow?

  - by iblue

  My Laptop and my workstation are both connected to a Gigabit Switch. Both are running Linux. But when I copy files with rsync, it performs badly. I get about 22 MB/s. Shouldn't I theoretically get about 125 MB/s? What is the limiting factor here? EDIT: I conducted some experiments. Write performance on the laptop The laptop has a xfs filesystem with full disk encryption. It uses aes-cbc-essiv:sha256 cipher mode with 256 bits key length. Disk write performance is 58.8 MB/s. iblue@nerdpol:~$ LANG=C dd if=/dev/zero of=test.img bs=1M count=1024 1073741824 Bytes (1.1 GB) copied, 18.2735 s, 58.8 MB/s Read performance on the workstation The files I copied are on a software RAID-5 over 5 HDDs. On top of the raid is a lvm. The volume itself is encrypted with the same cipher. The workstation has a FX-8150 cpu that has a native AES-NI instruction set which speeds up encryption. Disk read performance is 256 MB/s (cache was cold). iblue@raven:/mnt/bytemachine/imgs$ dd if=backup-1333796266.tar.bz2 of=/dev/null bs=1M 10213172008 bytes (10 GB) copied, 39.8882 s, 256 MB/s Network performance I ran iperf between the two clients. Network performance is 939 Mbit/s iblue@raven $ iperf -c 94.135.XXX ------------------------------------------------------------ Client connecting to 94.135.XXX, TCP port 5001 TCP window size: 23.2 KByte (default) ------------------------------------------------------------ [ 3] local 94.135.XXX port 59385 connected with 94.135.YYY port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec

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• Wipe free space on LVM-LUKS (dm-crypt) Volume

  - by peter4887

  My three partitions for my system are created with LVM on a LUKS partition (dm-crypt). These are /home, / and swap. The filesystem is ext4. They are encrypted, because they are on my laptop and I don't want that some laptop thieves get my data. But I often share my laptop with other people so they can access my encrypted partitions. I don't want that these people can recover my cache and all the data I deleted. So I'm now trying to wipe all my free space on /home to prevent against recovering with tools like photorec. (one overwrite should do, the need of multiple overwriting is just a rumor) But still I haven't found any solution to wipe this free space successfully. I tried dd if=/dev/zero of=/home/fillitup bs=512 count=[count of free sectiors] so my partition was complete full of data. df /dev/mapper/home said 100% is used and there are 0 sectors available. But I could still recover gigs of data with photorec, although I selected to recover just form the free space. photorec displays: /dev/mapper/home - 340 GB / 317 GiB (RO) , but df displays that the size of /home is just 313G, why are there these differences and what did the 340GB means? It looks like there is a place on my /dev/mapper/home partition, that I can't access to overwrite, but I can access it to recover. I also checked for corrupted sectors, but there aren't any. Maybe this is the space between my existing files? Did anyone knows why I can't wipe my free space with dd, and how I can find the location of the loads of recoverable files, to securely delete them?

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• retain last used path to location for saving files in Windows 7

  - by Mark Miller

  I am using Microsoft Office 2010 and Windows 7 on a Dell PC. I am opening a bunch of MSWord files one at a time, copying data tables therein, pasting the data into Excel and saving the Excel files as comma delimited text files. I am creating a separate Excel file for each MSWord file. The path to the folder containing the saved comma-delimited files is quite long, something like this: c:\users\me\aa\bb\cc\dd\ee\ Every time I open Excel and save a new comma-delimited file I have to re-navigate the entire path (c:\users\me\aa\bb\cc\dd\ee). In the past Windows seemed to remember the last used path, saving a lot of tedious key-strokes. In fact, I think Windows did this for me as recently as last week, albeit on a different computer. Can I apply a setting in Windows somewhere asking it to offer the last used path as a default when saving files so I do not have to re-navigate the entire directory structure to save each new comma-delimited file? If I can, how so? Where is the option for specifying that setting? Thank you for any help.

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• Oracle ADF Coverage at OOW

  - by Frank Nimphius

  Below is the schedule for all ADF related sessions at a glance. Note the Meet and greet session added for Wednesday Octiber 3rd from 4.30 pm to 5:30. Oracle ADF and Fusion Development General Session Mon 1 Oct, 2012 Time Title Location 10:45 AM - 11:45 AM General Session: The Future of Development for Oracle Fusion—From Desktop to Mobile to Cloud Marriott Marquis - Salon 8 12:15 PM - 1:15 PM General Session: Extend Oracle Fusion Apps to Tablets/Smartphones with Oracle Mobile Technology Moscone West - 3014 1:45 PM - 2:45 PM General Session: Extend Oracle Applications to Mobile Devices with Oracle’s Mobile Technologies Moscone West - 3002/3004 4:45 PM - 5:45 PM General Session: Building Mobile Applications with Oracle Cloud Moscone West - 2002/2004 Conference Session Mon 1 Oct, 2012 Time Title Location 12:15 PM - 1:15 PM Understanding Oracle ADF and Its Role in Oracle Fusion Moscone South - 306 1:45 PM - 2:45 PM Building Performant Oracle ADF Business Components to Meet Tomorrow’s Needs Marriott Marquis - Golden Gate C3 3:15 PM - 4:15 PM End-to-End Oracle ADF Development in Eclipse Marriott Marquis - Golden Gate C3 4:45 PM - 5:45 PM Classic Mistakes with Oracle Application Development Framework Marriott Marquis - Salon 7 Tues 2 Oct, 2012 Time Title Location 10:15 AM - 11:15 AM One Size Doesn’t Fit All: Oracle ADF Architecture Fundamentals Marriott Marquis - Golden Gate C2 10:15 AM - 11:15 AM Oracle Business Process Management/Oracle ADF Integration Best Practices Marriott Marquis - Golden Gate C3 11:45 AM - 12:45 PM Mobile-Enable Oracle Fusion Middleware and Enterprise Applications with Oracle ADF Moscone South - 306 11:45 AM - 12:45 PM Secrets of Successful Projects with Oracle Application Development Framework Marriott Marquis - Golden Gate C2 1:15 PM - 2:15 PM Develop On-Device iPhone and iPad Apps Without Writing Any Objective-C Code Marriott Marquis - Golden Gate C2 1:15 PM - 2:15 PM BPM, SOA, and Oracle ADF Combined: Patterns Learned from Oracle Fusion Applications Moscone West - 3003 1:15 PM - 2:15 PM The Future of Forms Is … Oracle Forms (and Friends) Moscone South - 306 5:00 PM - 6:00 PM Best Practices for Integrating SOAP and REST Service into Oracle ADF Marriott Marquis - Golden Gate C2 Wed 3 Oct, 2012 Time Title Location 10:15 AM - 11:15 AM Mobile Apps for Oracle E-Business Suite with Oracle ADF Mobile and Oracle SOA Suite Moscone West - 3001 10:15 AM - 11:15 AM Visualize This! Best Practices for Data Visualization in Desktop and Mobile Apps Marriott Marquis - Golden Gate C3 10:15 AM - 11:15 AM Set Up Your Oracle ADF Project and Development Team for Productivity: Seven Essential Tips Marriott Marquis - Golden Gate C2 11:45 AM - 12:45 PM How to Migrate an Oracle Forms Application to Oracle ADF Marriott Marquis - Golden Gate C2 1:15 PM - 2:15 PM Oracle ADF: Lessons Learned in Real-World Implementations Moscone South - 309 3:30 PM - 4:30 PM Oracle ADF Implementations Around the Globe: Best Practices Marriott Marquis - Golden Gate C2 3:30 PM - 4:30 PM Oracle Developer Cloud Services Marriott Marquis - Salon 7 4:30 PM - 5:30 PM Oracle JDeveloper and Oracle ADF: What’s New Hilton San Francisco - Continental Ballroom 5 5:00 PM - 6:00 PM Mobile Solutions for Oracle E-Business Suite Applications: Technical Insight Moscone West - 2020 5:00 PM - 6:00 PM Extending Social into Enterprise Applications and Business Processes Marriott Marquis - Golden Gate C3 5:00 PM - 6:00 PM The Tie That Binds: An Introduction to Oracle ADF Bindings Marriott Marquis - Golden Gate C2 Thur 4 Oct, 2012 Time Title Location 11:15 AM - 12:15 PM Using Oracle ADF with Oracle E-Business Suite: The Full Integration View Moscone West - 3003 11:15 AM - 12:15 PM Deep Dive into Oracle ADF: Advanced Techniques Marriott Marquis - Golden Gate C2 12:45 PM - 1:45 PM Monitor, Analyze, and Troubleshoot Your Oracle ADF Application Marriott Marquis - Golden Gate C2 2:15 PM - 3:15 PM Oracle WebCenter Portal: Creating and Using Content Presenter Templates Marriott Marquis - Golden Gate C2 HOL (Hands-on Lab) Mon 1 Oct, 2012 Time Title Location 10:45 AM - 11:45 AM Developing Applications for Mobile iOS and Android Devices with Oracle ADF Mobile: Hands-on Lab Marriott Marquis - Salon 10A 1:45 PM - 2:45 PM Build Mobile Applications for Oracle E-Business Suite Marriott Marquis - Salon 10A 3:15 PM - 4:15 PM Developing Applications for Mobile iOS and Android Devices with Oracle ADF Mobile: Hands-on Lab Marriott Marquis - Salon 10A 3:15 PM - 4:15 PM Introduction to Oracle ADF: Hands-on Lab Marriott Marquis - Salon 3/4 4:45 PM - 5:45 PM Application Lifecycle Management with Oracle JDeveloper: Hands-on Lab Marriott Marquis - Salon 3/4 Tues 2 Oct, 2012 Time Title Location 10:15 AM - 11:15 AM Developing Applications for Mobile iOS and Android Devices with Oracle ADF Mobile: Hands-on Lab Marriott Marquis - Salon 10A 5:00 PM - 6:00 PM Developing Applications for Mobile iOS and Android Devices with Oracle ADF Mobile: Hands-on Lab Marriott Marquis - Salon 10A Wed 3 Oct, 2012 Time Title Location 10:15 AM - 11:15 AM Introduction to Oracle ADF: Hands-on Lab Marriott Marquis - Salon 3/4 11:45 AM - 12:45 PM Developing Applications for Mobile iOS and Android Devices with Oracle ADF Mobile: Hands-on Lab Marriott Marquis - Salon 10A 1:15 PM - 2:15 PM Build Mobile Applications for Oracle E-Business Suite Marriott Marquis - Salon 10A 3:30 PM - 4:30 PM Developing Applications for Mobile iOS and Android Devices with Oracle ADF Mobile: Hands-on Lab Marriott Marquis - Salon 10A 5:00 PM - 6:00 PM Developing Applications for Mobile iOS and Android Devices with Oracle ADF Mobile: Hands-on Lab Marriott Marquis - Salon 10A Thur 4 Oct, 2012 Time Title Location 11:15 AM - 12:15 PM Developing Applications for Mobile iOS and Android Devices with Oracle ADF Mobile: Hands-on Lab Marriott Marquis - Salon 10A 11:15 AM - 12:15 PM Introduction to Oracle ADF: Hands-on Lab Marriott Marquis - Salon 3/4 12:45 PM - 1:45 PM Oracle ADF for Java EE Developers with Oracle Enterprise Pack for Eclipse Marriott Marquis - Salon 3/4 BOF (Birds-of-a-Feather) Mon 1 Oct, 2012 Time Title Location 6:15 PM - 7:00 PM How to Get Started with Oracle ADF Marriott Marquis - Club Room 7:15 PM - 8:00 PM Building Next-Generation Applications with Oracle ADF and Oracle BPM Marriott Marquis - Golden Gate C3 7:15 PM - 8:00 PM The Future of Oracle Forms: Upgrade, Modernize, or Migrate? Marriott Marquis - Golden Gate C2 7:15 PM - 8:00 PM Oracle ADF Faces: One Site for Many Devices Marriott Marquis - Golden Gate C1 - User Group Forum (Sunday Only) Sun 30 Sept, 2012 Time Title Location 9:00 AM - 10:00 AM Oracle ADF Immersion: How an Oracle Forms Developer Immersed Himself in the Oracle ADF World Moscone South - 305 10:15 AM - 11:15 AM Deploy with Joy: Using Hudson to Build and Deploy Your Oracle ADF Applications Moscone South - 305 11:30 AM - 12:30 PM ADF EMG User Group: A Peek into the Oracle ADF Architecture of Oracle Fusion Applications Moscone South - 305 12:45 PM - 3:45 PM ADF EMG User Group: Oracle Fusion Middleware Live Application Development Demo Moscone South - 305 3:15 PM - 4:15 PM Mobile Development with Oracle JDeveloper and Oracle ADF Moscone West - 2010 Demos Demo Location Developer Moscone North, Upper Lobby - N-002 Oracle ADF Mobile Development Moscone North, Upper Lobby - N-001 Oracle Eclipse Projects Hilton San Francisco, Grand Ballroom - HHJ-008 Oracle Enterprise Pack for Eclipse Moscone South, Right - S-208 Oracle JDeveloper and Oracle ADF Moscone South, Right - S-207 Exhibits 0 Exhibitor Location Accenture Moscone South - 1813 Moscone South - 2221 Infosys Moscone South - 1701 Moscone South - SMR-005 Innowave Technology Moscone South - 2309 ODTUG Moscone West, Level 2 Lobby - Kiosk in the User Groups Pavilion Oracle ADF Developers Meet Up Wednesday, Oct 03 Time Activity Location 4:30 PM - 5:30 PM Stop by the OTN Lounge and meet other Oracle ADF & Fusion developers as well as product managers and engineers who work on Oracle ADF, ADF Mobile and ADF Essentials. Feedback and questions welcome, or simply stop by and say ‘hi!’ and enjoy free beer. OTN Lounge

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• Oracle Communications Data Model

  - by jean-pierre.dijcks

  I've mentioned OCDM in previous posts but found the following (see end of the post) podcast on the topic and figured it is worthwhile to spread the news some more. ORetailDM and OCommunicationsDM are the two data models currently available from Oracle. Both are intended to capture: Business best practices and industry knowledge Pre-built advanced analytics intended to predict future events before they happen (like the Churn model shown below) Oracle technology best practices to ensure optimal performance of the model All of this typically comes with a reduced time to implementation, or as the marketing slogan goes, reduced time to value. Here are the links: Podcast on OCDM OTN pages for OCDM and ORDM

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• New Product: Oracle Java ME Embedded 3.2 – Small, Smart, Connected

  - by terrencebarr

  The Internet of Things (IoT) is coming. And, with todays launch of the Oracle Java ME Embedded 3.2 product, Java is going to play an even greater role in it. Java in the Internet of Things By all accounts, intelligent embedded devices are penetrating the world around us – driving industrial processes, monitoring environmental conditions, providing better health care, analyzing and processing data, and much more. And these devices are becoming increasingly connected, adding another dimension of utility. Welcome to the Internet of Things. As I blogged yesterday, this is a huge opportunity for the Java technology and ecosystem. To enable and utilize these billions of devices effectively you need a programming model, tools, and protocols which provide a feature-rich, consistent, scalable, manageable, and interoperable platform.  Java technology is ideally suited to address these technical and business problems, enabling you eliminate many of the typical challenges in designing embedded solutions. By using Java you can focus on building smarter, more valuable embedded solutions faster. To wit, Java technology is already powering around 10 billion devices worldwide. Delivering on this vision and accelerating the growth of embedded Java solutions, Oracle is today announcing a brand-new product: Oracle Java Micro Edition (ME) Embedded 3.2, accompanied by an update release of the Java ME Software Development Kit (SDK) to version 3.2. What is Oracle Java ME Embedded 3.2? Oracle Java ME Embedded 3.2 is a complete Java runtime client, optimized for ARM architecture connected microcontrollers and other resource-constrained systems. The product provides dedicated embedded functionality and is targeted for low-power, limited memory devices requiring support for a range of network services and I/O interfaces.  What features and APIs are provided by Oracle Java ME Embedded 3.2? Oracle Java ME Embedded 3.2 is a Java ME runtime based on CLDC 1.1 (JSR-139) and IMP-NG (JSR-228). The runtime and virtual machine (VM) are highly optimized for embedded use. Also included in the product are the following optional JSRs and Oracle APIs: File I/O API’s (JSR-75)  Wireless Messaging API’s (JSR-120) Web Services (JSR-172) Security and Trust Services subset (JSR-177) Location API’s (JSR-179) XML API’s (JSR-280)  Device Access API Application Management System (AMS) API AccessPoint API Logging API Additional embedded features are: Remote application management system Support for continuous 24×7 operation Application monitoring, auto-start, and system recovery Application access to peripheral interfaces such as GPIO, I2C, SPIO, memory mapped I/O Application level logging framework, including option for remote logging Headless on-device debugging – source level Java application debugging over IP Connection Remote configuration of the Java VM What type of platforms are targeted by Oracle Java ME 3.2 Embedded? The product is designed for embedded, always-on, resource-constrained, headless (no graphics/no UI), connected (wired or wireless) devices with a variety of peripheral I/O.  The high-level system requirements are as follows: System based on ARM architecture SOCs Memory footprint (approximate) from 130 KB RAM/350KB ROM (for a minimal, customized configuration) to 700 KB RAM/1500 KB ROM (for the full, standard configuration)  Very simple embedded kernel, or a more capable embedded OS/RTOS At least one type of network connection (wired or wireless) The initial release of the product is delivered as a device emulation environment for x86/Windows desktop computers, integrated with the Java ME SDK 3.2. A standard binary of Oracle Java ME Embedded 3.2 for ARM KEIL development boards based on ARM Cortex M-3/4 (KEIL MCBSTM32F200 using ST Micro SOC STM32F207IG) will soon be available for download from the Oracle Technology Network (OTN).  What types of applications can I develop with Oracle Java ME Embedded 3.2? The Oracle Java ME Embedded 3.2 product is a full-featured embedded Java runtime supporting applications based on the IMP-NG application model, which is derived from the well-known MIDP 2 application model. The runtime supports execution of multiple concurrent applications, remote application management, versatile connectivity, and a rich set of APIs and features relevant for embedded use cases, including the ability to interact with peripheral I/O directly from Java applications. This rich feature set, coupled with familiar and best-in class software development tools, allows developers to quickly build and deploy sophisticated embedded solutions for a wide range of use cases. Target markets well supported by Oracle Java ME Embedded 3.2 include wireless modules for M2M, industrial and building control, smart grid infrastructure, home automation, and environmental sensors and tracking. What tools are available for embedded application development for Oracle Java ME Embedded 3.2? Along with the release of Oracle Java ME Embedded 3.2, Oracle is also making available an updated version of the Java ME Software Development Kit (SDK), together with plug-ins for the NetBeans and Eclipse IDEs, to deliver a complete development environment for embedded application development.  OK – sounds great! Where can I find out more? And how do I get started? There is a complete set of information, data sheet, API documentation, “Getting Started Guide”, FAQ, and download links available: For an overview of Oracle Embeddable Java, see here. For the Oracle Java ME Embedded 3.2 press release, see here. For the Oracle Java ME Embedded 3.2 data sheet, see here. For the Oracle Java ME Embedded 3.2 landing page, see here. For the Oracle Java ME Embedded 3.2 documentation page, including a “Getting Started Guide” and FAQ, see here. For the Oracle Java ME SDK 3.2 landing and download page, see here. Finally, to ask more questions, please see the OTN “Java ME Embedded” forum To get started, grab the “Getting Started Guide” and download the Java ME SDK 3.2, which includes the Oracle Java ME Embedded 3.2 device emulation.  Can I learn more about Oracle Java ME Embedded 3.2 at JavaOne and/or Java Embedded @ JavaOne? Glad you asked Both conferences, JavaOne and Java Embedded @ JavaOne, will feature a host of content and information around the new Oracle Java ME Embedded 3.2 product, from technical and business sessions, to hands-on tutorials, and demos. Stay tuned, I will post details shortly. Cheers, – Terrence Filed under: Mobile & Embedded Tagged: "Oracle Java ME Embedded", Connected, embedded, Embedded Java, Java Embedded @ JavaOne, JavaOne, Smart

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• Oracle B2B Started Kit

  - by Nitesh Jain Oracle

  This post is for audience who is starting their journey with Oracle B2B 11g practice. Thought of writing this article as even i wondered as to what to do where to search while i was like you. Hope this material will help you to understand Oracle B2B closely: Oracle B2B OTN : http://www.oracle.com/technology/products/soa/b2b/index.html Download Location: http://www.oracle.com/technology/products/soa/soasuite/collateral/downloads.html#11.1.1.3.0 Installation Guide: http://download.oracle.com/docs/cd/E14571_01/doc.1111/e13925/toc.htm User Guide: http://download.oracle.com/docs/cd/E14571_01/integration.1111/e10229/toc.htm Sample Location: B2B Samples are part of SOA sample at below location: http://www.oracle.com/technology/sample_code/products/soa/index.html Developer Notes / Step by Step configuration guide: http://www.oracle.com/technology/products/soa/b2b/index.html http://www.oracle.com/technology/products/soa/b2b/collateral/B2B_TU001_EDI.pdf http://www.oracle.com/technology/products/soa/b2b/collateral/B2B_TU002_HL7.pdf http://www.oracle.com/technology/products/soa/b2b/collateral/B2B_TU003_ebxml.pdf Blog: http://blogs.oracle.com/oracleb2bgurus/ Forum: http://forums.oracle.com/forums/forum.jspa?forumID=242&start=0 This article is as per Oracle B2B 11g PS2 Release (11.1.1.3.0)

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• Webcast Replay: Upgrading to Oracle Database 11g with Tom Kyte

  - by john.brust

  On Friday, we caught up with Tom Kyte, Oracle database expert and host of AskTom.oracle.com. Join us to hear what Oracle Database 11g Release 2 means to Tom. Learn how you can make 'change' safe and benefit from new functionality to make better use of your standby databases, capture and replay workloads, tune SQL performance, flashback for rapid recovery from human error, and more. Click to view webcast (and Q&A) replay. We also invite you to visit us our Oracle Database 11g upgrade page on otn.oracle.com.

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• links for 2010-04-02

  - by Bob Rhubart

  Jeff Victor: Solaris Virtualization Book Jeff Victor with an update on the status of the book, "Oracle Solaris 10 System Virtualization Essentials." (tags: sun solaris virtualization) Mitch Denny: Architecture vs. Design It's an old post but it still resonates: "In the consumer electronics business, some people are actually hired to go through a system and remove components until it stops working – they do this to remove the cost before they go into mass production. We need more of this in the software business." -- Mitch Denny (tags: architecture design development) @vambenepe: Enterprise application integration patterns for IT management: a blast from the past or from the future? "In a recent blog post, Don Ferguson (CTO at CA) describes CA Catalyst, a major architectural overall which “applies enterprise application integration patterns to the problem of integrating IT management systems”. Reading this was fascinating to me. Not because the content was some kind of revelation, but exactly for the opposite reason. Because it is so familiar." -- William Vambenepe (tags: otn oracle eai)

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• Upgrading Fusion Middleware 11.1.1.x to 11.1.1.4

  - by James Taylor

  This is a follow on from my previous post where we upgraded 11.1.1.2 to 11.1.1.3. The instructions I provide here will work for Fusion Middleware 11.1.1.2 and 11.1.1.3 wanting to upgrade to 11.1.1.4. In this example I’m just upgrading SOA Suite on OEL 64bit but the steps will be the same, some of the downloads may be different based on your environment. To upgrade to 11.1.1.4 you need to have access to http://support.oracle.com as this is where the downloads reside. Oracle provides 11.1.1.4 as a standalone download so you can do a fresh install if required using OTN downloads (http://www.oracle.com/technetwork/indexes/downloads/index.html). The high level steps to upgrade are as follows: Download software Shutdown you SOA Environment Upgrade WLS to 11.1.1.4 Upgrade SOA Suite to 11.1.1.4 Upgrade OSB to 11.1.1.4 Upgrade MSD Schemas Identify the downloads you require for your install. You will need the WebLogic Server Upgrade and the additional product downloads. If you are using 64bit then use the generic version. The downloads are found from the following location - http://download.oracle.com/docs/html/E18749_01/download_readme.htm#BABDDIIC For the purpose of this post I downloaded the following patches 11060985 – WLS Server Generic 11060960 – SOA Suite 11061005 – OSB Suite You must also download the 11.1.1.4 RCU tool to upgrade the DB schemas. It is available via OTN, or, Oracle Support, I have provided the link from Oracle Support.  11060956 – RCU Make sure you have set the Java executable in your PATH e.g. export PATH=$JAVA_HOME/bin:$PATH  Make sure all your WebLogic environment has been shut down before performing the upgrade. Extract the WLS patch 11060985 to a temporary directory and start the installer java –jar wls1034_upgrade_generic.jar Please note if you are not running 64BIT then the upgrade executable will be just a bin file which you can execute directly. Chose the right Oracle home for your WebLogic Server install. In the Register for Security Updates you can enter your details or just click Next. If you do not enter details confirm that you don’t want to receive these updates Select the products you want to upgrade and select next. It is recommended that you accept the defaults. Confirm the directories that will be upgraded Upgrade of WLS ahs been completed   Extract your both SOA downloads to a temporary directory and run the installer found in Disk1 ./runInstaller -jreLoc /java/jdk1.6.0_20/jre Please note that the java location and version may be different for your environment Skip the Software Updates Ensure your system meets the prerequisites Set the Oracle home for your SOA install. You will be asked to confirm that you want to upgrade, click Yes Choose your application server. Since you are upgrading from 11.1.1.x you will be on WebLogic Start the Install Installation Upgrade of SOA Suite completed accept the default to finish.   In my environment I have OSB installed so I need to upgrade this next. If you don’t have SOA Suite you can go straight to completing the DB Schema updates at Step 24.  Extract the OSB upgrade files to a temporary directory and execute the installer found in the Disk1 folder. ./runInstaller -jreLoc /java/jdk1.6.0_20/jre Skip the software updates Select the Oracle home for your environment Accept the warning to continue the upgrade Point to the location of your WebLogic Server installation Install the OSB upgrade Upgrade has been completed accept the defaults Change directory to $MW_HOME/oracle_common/bin where the Patch Set Assistant is installed Execute the following command to update the MDS schema. Please not for my examples I have the context set to DEV. your may be different. This means that all my schemas are prefixed by DEV. ./psa -dbType Oracle -dbConnectString 'localhost:1521:xe' -dbaUserName sys -schemaUserName DEV_MDS You will be asked you passwords for sys and the schema Enter the database administrator password for "sys": Enter the schema password for schema user "DEV_MDS": Change directory to $MW_HOME/Oracle_SOA1/bin to where the Patch Set Assistant is installed for SOA Suite. Execute the following command to update the SOA and BAM schemas ./psa -dbType Oracle -dbConnectString 'localhost:1521:xe' -dbaUserName sys -schemaUserName DEV_SOAINFRA   To check that you have the installed correctly run the following SQL as sysdba. SELECT owner, version, status FROM schema_version_registry; OWNER                          VERSION                        STATUS ------------------------------ ------------------------------ ----------- DEV_MDS                        11.1.1.4.0                     VALID DEV_SOAINFRA                   11.1.1.4.0                     VALID Don’t stress if the versions are not all sitting at version 11.1.1.4 as not all schemas need to be updated. The key ones are MDS and SOAINFRA

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• New ADF Desktop Integration Components Demo Available

  - by juan.ruiz

  The new ADF Desktop Integration Components demo is available on the OTN and can be downloaded and ran in a standalone way.  The demo follows the same principles of the  ADF Faces and DVT Components demo, presenting the list of all the components available with its corresponding properties as well as feature demos exposing advanced functionality of the framework. It is a great demo that exposes from the very basics of each visual component as well as advanced functionality such as dependent list of values, master-details integration, event handling, integration with ADF Faces and web interfaces and parameter passing between ADF applications to excel. You need JDeveloper PS1 (11.1.2.0) and a Oracle database to install the sample schema. Your feedback is always welcome -let us know what you think. Access the demo here.

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• Popup Details for a Table Record

  - by shay.shmeltzer

  This one started as an OTN how-to question that seemed like something that should work automatically - turns out you need a couple of small tweaks to get it working. The idea is to have a table on a page showing multiple records, you can click any row in the table - and get a pop-up window that shows more data about that row. At first I thought I'll just need to drag the same view twice to the page - once as a table and then as a form in a pop-up. But then the Form didn't reflect the new row that got selected in the table - you'll always see the first row you selected. Adding a Partial Page Rendering between the table and the pop-up didn't do the trick either. Then I realized that the content delivery attribute of the pop-up was set to lazy, when I switched it to immediate - everything worked. Here is a little demo showing the whole development process: Note that the content delivery method attribute is also something you might want to check if you see your tables being refreshed too often when you scroll through records for example.

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