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• DB2 insert performance - How to measure

  - by svrist

  [From stackoverflow] Im trying to find a way to speedup my inserts to a DB2 9.7.1 (ubuntu linux) Im watching vmstat and trying to gather some statistics via the db2 get snapshot commands but im not able to figure out which numbers im looking for to be able to see where the trouble is. I've read lits of stuff like http://www.eggheadcafe.com/software/aspnet/35692526/question-multiple-row-in.aspx, and http://www.ibm.com/developerworks/data/library/tips/dm-0403wilkins/ and tricks like ALTER TABLE lalala APPEND ON works somewhat (the difference between a dd if=/dev/zero and insert is still a factor 10) but I would like to be able to find the counters or other performance indicators that actually show why it makes sense to use those tricks. For example: What is the metric called that shows me that it is buffer pages allocation (FSCR stuff) that is the problem Where do I see that the insert time is hampered by clustered indexes? I find db2top very useful but im still searching for more direct view of "this is your bottleneck" methods

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• Setting up a VPN connection to Amazon VPC - routing

  - by Keeno

  I am having some real issues setting up a VPN between out office and AWS VPC. The "tunnels" appear to be up, however I don't know if they are configured correctly. The device I am using is a Netgear VPN Firewall - FVS336GV2 If you see in the attached config downloaded from VPC (#3 Tunnel Interface Configuration), it gives me some "inside" addresses for the tunnel. When setting up the IPsec tunnels do I use the inside tunnel IP's (e.g. 169.254.254.2/30) or do I use my internal network subnet (10.1.1.0/24) I have tried both, when I tried the local network (10.1.1.x) the tracert stops at the router. When I tried with the "inside" ips, the tracert to the amazon VPC (10.0.0.x) goes out over the internet. this all leads me to the next question, for this router, how do I set up stage #4, the static next hop? What are these seemingly random "inside" addresses and where did amazon generate them from? 169.254.254.x seems odd? With a device like this, is the VPN behind the firewall? I have tweaked any IP addresses below so that they are not "real". I am fully aware, this is probably badly worded. Please if there is any further info/screenshots that will help, let me know. Amazon Web Services Virtual Private Cloud IPSec Tunnel #1 ================================================================================ #1: Internet Key Exchange Configuration Configure the IKE SA as follows - Authentication Method : Pre-Shared Key - Pre-Shared Key : --- - Authentication Algorithm : sha1 - Encryption Algorithm : aes-128-cbc - Lifetime : 28800 seconds - Phase 1 Negotiation Mode : main - Perfect Forward Secrecy : Diffie-Hellman Group 2 #2: IPSec Configuration Configure the IPSec SA as follows: - Protocol : esp - Authentication Algorithm : hmac-sha1-96 - Encryption Algorithm : aes-128-cbc - Lifetime : 3600 seconds - Mode : tunnel - Perfect Forward Secrecy : Diffie-Hellman Group 2 IPSec Dead Peer Detection (DPD) will be enabled on the AWS Endpoint. We recommend configuring DPD on your endpoint as follows: - DPD Interval : 10 - DPD Retries : 3 IPSec ESP (Encapsulating Security Payload) inserts additional headers to transmit packets. These headers require additional space, which reduces the amount of space available to transmit application data. To limit the impact of this behavior, we recommend the following configuration on your Customer Gateway: - TCP MSS Adjustment : 1387 bytes - Clear Don't Fragment Bit : enabled - Fragmentation : Before encryption #3: Tunnel Interface Configuration Your Customer Gateway must be configured with a tunnel interface that is associated with the IPSec tunnel. All traffic transmitted to the tunnel interface is encrypted and transmitted to the Virtual Private Gateway. The Customer Gateway and Virtual Private Gateway each have two addresses that relate to this IPSec tunnel. Each contains an outside address, upon which encrypted traffic is exchanged. Each also contain an inside address associated with the tunnel interface. The Customer Gateway outside IP address was provided when the Customer Gateway was created. Changing the IP address requires the creation of a new Customer Gateway. The Customer Gateway inside IP address should be configured on your tunnel interface. Outside IP Addresses: - Customer Gateway : 217.33.22.33 - Virtual Private Gateway : 87.222.33.42 Inside IP Addresses - Customer Gateway : 169.254.254.2/30 - Virtual Private Gateway : 169.254.254.1/30 Configure your tunnel to fragment at the optimal size: - Tunnel interface MTU : 1436 bytes #4: Static Routing Configuration: To route traffic between your internal network and your VPC, you will need a static route added to your router. Static Route Configuration Options: - Next hop : 169.254.254.1 You should add static routes towards your internal network on the VGW. The VGW will then send traffic towards your internal network over the tunnels. IPSec Tunnel #2 ================================================================================ #1: Internet Key Exchange Configuration Configure the IKE SA as follows - Authentication Method : Pre-Shared Key - Pre-Shared Key : --- - Authentication Algorithm : sha1 - Encryption Algorithm : aes-128-cbc - Lifetime : 28800 seconds - Phase 1 Negotiation Mode : main - Perfect Forward Secrecy : Diffie-Hellman Group 2 #2: IPSec Configuration Configure the IPSec SA as follows: - Protocol : esp - Authentication Algorithm : hmac-sha1-96 - Encryption Algorithm : aes-128-cbc - Lifetime : 3600 seconds - Mode : tunnel - Perfect Forward Secrecy : Diffie-Hellman Group 2 IPSec Dead Peer Detection (DPD) will be enabled on the AWS Endpoint. We recommend configuring DPD on your endpoint as follows: - DPD Interval : 10 - DPD Retries : 3 IPSec ESP (Encapsulating Security Payload) inserts additional headers to transmit packets. These headers require additional space, which reduces the amount of space available to transmit application data. To limit the impact of this behavior, we recommend the following configuration on your Customer Gateway: - TCP MSS Adjustment : 1387 bytes - Clear Don't Fragment Bit : enabled - Fragmentation : Before encryption #3: Tunnel Interface Configuration Outside IP Addresses: - Customer Gateway : 217.33.22.33 - Virtual Private Gateway : 87.222.33.46 Inside IP Addresses - Customer Gateway : 169.254.254.6/30 - Virtual Private Gateway : 169.254.254.5/30 Configure your tunnel to fragment at the optimal size: - Tunnel interface MTU : 1436 bytes #4: Static Routing Configuration: Static Route Configuration Options: - Next hop : 169.254.254.5 You should add static routes towards your internal network on the VGW. The VGW will then send traffic towards your internal network over the tunnels. EDIT #1 After writing this post, I continued to fiddle and something started to work, just not very reliably. The local IPs to use when setting up the tunnels where indeed my network subnets. Which further confuses me over what these "inside" IP addresses are for. The problem is, results are not consistent what so ever. I can "sometimes" ping, I can "sometimes" RDP using the VPN. Sometimes, Tunnel 1 or Tunnel 2 can be up or down. When I came back into work today, Tunnel 1 was down, so I deleted it and re-created it from scratch. Now I cant ping anything, but Amazon AND the router are telling me tunnel 1/2 are fine. I guess the router/vpn hardware I have just isnt up to the job..... EDIT #2 Now Tunnel 1 is up, Tunnel 2 is down (I didn't change any settings) and I can ping/rdp again. EDIT #3 Screenshot of route table that the router has built up. Current state (tunnel 1 still up and going string, 2 is still down and wont re-connect)

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• Changing Commenting behavior for ruby in Aptana Studio

  - by Flethuseo

  There is something I really hate in Aptana Studio 3 when I am using Ruby. When I try to use Ctrl+Shift+/ it inserts a comment of this form: =begin My lines of code My lines of code My lines of code My lines of code My lines of code =end I would like the Ctrl+Shift+/ to be defaulted to toggle commenting with '# ' instead. I have gone to the key preferences and tried changing PyDev toggle comment to Ctrl+Shift+/ but it doesn't work. It must be picking that behavior from somewhere else. What do I need to change so that I get the IDE to behave like I want. Ted.

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• How do I send traffic from my Mac's wifi to my VPN client?

  - by Heath Borders

  I need to connect my Android to a Juniper VPN. Unfortunately, Juniper doesn't support Android on our VPN version. We've already put in a feature request for it, but we have no idea how long it will take to be complete. Right now, I connect to the Juniper VPN with a Juniper Mac OSX VPN client that uses Java to install kernel extensions to start and stop the VPN. Thus, I can't use the Network panel in System Preferences to create a VPN device, which means it won't show up in the 'Sharing' panel's Internet Sharing Share your connection from: menu, as suggested here. I used newproc.d to see what /usr/libexec/InternetSharing did when it ran, and it runs the following processes: 2013 Nov 1 00:26:54 5565 <1> 64b /usr/libexec/launchdadd 2013 Nov 1 00:26:55 5566 <1> 64b /usr/libexec/InternetSharing 2013 Nov 1 00:26:56 5568 <5566> 64b natpmpd -d -y bridge100 en0 2013 Nov 1 00:26:56 5569 <1> 64b /usr/libexec/pfd -d 2013 Nov 1 00:26:56 5567 <5566> 64b bootpd -d -P My Juniper VPN client creates the following devices (output of ifconfig): jnc0: flags=841<UP,RUNNING,SIMPLEX> mtu 1400 inet 10.61.9.61 netmask 0xffffffff open (pid 920) jnc1: flags=841<UP,RUNNING,SIMPLEX> mtu 1450 closed So, it seems like I should just be able to do this and have everything work: sudo killall -9 natpmpd sudo /usr/libexec/natpmpd -y bridge100 jnc0 My android connected fine and could hit public internet sites, but it couldn't hit private VPN sites. I assume this is because I need to change the routes that /usr/libexec/InternetSharing sets up. This is the output from sudo pfctl -s all before starting Internet Sharing: No ALTQ support in kernel ALTQ related functions disabled TRANSLATION RULES: nat-anchor "com.apple/*" all rdr-anchor "com.apple/*" all FILTER RULES: scrub-anchor "com.apple/*" all fragment reassemble anchor "com.apple/*" all DUMMYNET RULES: dummynet-anchor "com.apple/*" all INFO: Status: Disabled for 0 days 00:11:02 Debug: Urgent State Table Total Rate current entries 0 searches 22875 34.6/s inserts 1558 2.4/s removals 1558 2.4/s Counters match 2005 3.0/s bad-offset 0 0.0/s fragment 0 0.0/s short 0 0.0/s normalize 0 0.0/s memory 0 0.0/s bad-timestamp 0 0.0/s congestion 0 0.0/s ip-option 12 0.0/s proto-cksum 0 0.0/s state-mismatch 1 0.0/s state-insert 0 0.0/s state-limit 0 0.0/s src-limit 0 0.0/s synproxy 0 0.0/s dummynet 0 0.0/s TIMEOUTS: tcp.first 120s tcp.opening 30s tcp.established 86400s tcp.closing 900s tcp.finwait 45s tcp.closed 90s tcp.tsdiff 60s udp.first 60s udp.single 30s udp.multiple 120s icmp.first 20s icmp.error 10s grev1.first 120s grev1.initiating 30s grev1.estblished 1800s esp.first 120s esp.estblished 900s other.first 60s other.single 30s other.multiple 120s frag 30s interval 10s adaptive.start 6000 states adaptive.end 12000 states src.track 0s LIMITS: states hard limit 10000 app-states hard limit 10000 src-nodes hard limit 10000 frags hard limit 5000 tables hard limit 1000 table-entries hard limit 200000 OS FINGERPRINTS: 696 fingerprints loaded This is the output from sudo pfctl -s all after starting Internet Sharing: No ALTQ support in kernel ALTQ related functions disabled TRANSLATION RULES: nat-anchor "com.apple/*" all nat-anchor "com.apple.internet-sharing" all rdr-anchor "com.apple/*" all rdr-anchor "com.apple.internet-sharing" all FILTER RULES: scrub-anchor "com.apple/*" all fragment reassemble scrub-anchor "com.apple.internet-sharing" all fragment reassemble anchor "com.apple/*" all anchor "com.apple.internet-sharing" all DUMMYNET RULES: dummynet-anchor "com.apple/*" all STATES: ALL tcp 10.0.1.32:50593 -> 74.125.225.113:443 SYN_SENT:CLOSED ALL udp 10.0.1.32:61534 -> 10.0.1.1:53 SINGLE:NO_TRAFFIC ALL udp 10.0.1.32:55433 -> 10.0.1.1:53 SINGLE:NO_TRAFFIC ALL udp 10.0.1.32:64041 -> 10.0.1.1:53 SINGLE:NO_TRAFFIC ALL tcp 10.0.1.32:50619 -> 74.125.225.131:443 SYN_SENT:CLOSED INFO: Status: Enabled for 0 days 00:00:01 Debug: Urgent State Table Total Rate current entries 5 searches 22886 22886.0/s inserts 1563 1563.0/s removals 1558 1558.0/s Counters match 2010 2010.0/s bad-offset 0 0.0/s fragment 0 0.0/s short 0 0.0/s normalize 0 0.0/s memory 0 0.0/s bad-timestamp 0 0.0/s congestion 0 0.0/s ip-option 12 12.0/s proto-cksum 0 0.0/s state-mismatch 1 1.0/s state-insert 0 0.0/s state-limit 0 0.0/s src-limit 0 0.0/s synproxy 0 0.0/s dummynet 0 0.0/s TIMEOUTS: tcp.first 120s tcp.opening 30s tcp.established 86400s tcp.closing 900s tcp.finwait 45s tcp.closed 90s tcp.tsdiff 60s udp.first 60s udp.single 30s udp.multiple 120s icmp.first 20s icmp.error 10s grev1.first 120s grev1.initiating 30s grev1.estblished 1800s esp.first 120s esp.estblished 900s other.first 60s other.single 30s other.multiple 120s frag 30s interval 10s adaptive.start 6000 states adaptive.end 12000 states src.track 0s LIMITS: states hard limit 10000 app-states hard limit 10000 src-nodes hard limit 10000 frags hard limit 5000 tables hard limit 1000 table-entries hard limit 200000 TABLES: OS FINGERPRINTS: 696 fingerprints loaded It looks like I need to change the pf settings that /usr/libexec/InternetSharing set up, but I have no idea how to do that.

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• Oracle parameter array binding from c# executed parallel and serial on different servers

  - by redir_dev_nut

  I have two Oracle 9i 64 bit servers, dev and prod. Calling a procedure from a c# app with parameter array binding, prod executes the procedure simultaneously for each value in the parameter array, but dev executes for each value serially. So, if the sproc does: select count(*) into cnt from mytable where id = 123; if cnt = 0 then insert into mytable (id) values (123); end if; Assuming the table initially does not have an id = 123 row. Dev gets cnt = 0 for the first array parameter value, then 1 for each of the subsequent. Prod gets cnt = 0 for all array parameter values and inserts id 123 for each. Is this a configuration difference, an illusion due to speed difference, something else?

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• Why does VIM say there is trailing whitespace on this command?

  - by Jesse Atkinson

  I am trying to write a beautify CSS command in vim that sorts and alphabetizes all of the CSS properties as well as checks to see if there is not a space after the colon and inserts one. Here is my code: nnoremap <leader>S :g#\({\n\)\@<=#.,/}/sort | %s/:\(\S\)/: \1/g<CR> :command! SortCSSBraceContents :g#\({\n\)\@<=#.,/}/sort | %s/:\(\S\)/: \1/g These work independently. However, I am trying to pipe them into one command. On save VIM says: Error detected while processing /var/home/jesse-atkinson/.vimrc: line 196: E488: Trailing characters Any ideas?

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• postgres memory allocation tuning 2

  - by pstanton

  i've got a Ubuntu Linux system with 12Gb memory most of which (at least 10Gb) can be allocated solely to postgres. the system also has a 6 disk 15k SCSI RAID 10 setup. The process i'm trying to optimise is twofold. firstly a single threaded, single connection will do many inserts into 2-4 tables linked by foreign key. secondly many different complex queries are run against the resulting data, using group by extensively. this part especially needs to be optimised. i have four of these processes running at once in order to make use of the quad core CPU, therefore there will generally be no more than 5 concurrent connections (1 spare for admin tasks). what configuration changes to the default Postgres config would you recommend? I'm looking for the optimum values for things like work_mem, shared_buffers etc. relevant doco thanks!

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• Oracle 10.2.0.1 --> 10.2.0.4 patchset errors on Advanced Queuing tables. Serious or not?

  - by hurfdurf

  We're running Oracle on RHEL 5.4 64-bit. We recently did an upgrade from 10.2.0.1 to 10.2.0.4. Many errors were generated during the upgrade (sample listed below from trace.log) but during application testing afterward everything seemed fine (clean EXP, inserts, updates, deletes, etc.). The errors look like they are all related to Advanced Queuing tables and views. We are not using replication at all, this is a simple single instance db. ORA-24002: QUEUE_TABLE SYS.AQ_EVENT_TABLE does not exist ORA-24032: object AQ$_AQ_SRVNTFN_TABLE_T exists, index could not be created ORA-24032: object AQ$_ALERT_QT_S exists, index could not be created for queue ORA-06512: at "SYS.DBMS_AQADM_SYSCALLS", line 117 ORA-06512: at "SYS.DBMS_AQADM_SYS", line 5116 Is this worth worrying about, and if so, how do I go about cleaning up/recreating the corrupted and/or missing objects?

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• back-end SQL server 2005 databases for website

  - by Datapimp23

  Hi, We're migrating an existing IIS website + MS SQL 2005 database (on the same server) to a new test set-up. The existing set-up is too slow. I want one ISS server and 2 X MS SQL server 2005. One live DB server for the website queries (inserts, updates) and another for backups, reports or stored procedures. So the live DB should be more aimed at performance. The other doesn't even need to be synced instantly. What is the best way in SQL server 2005 to set this up. Can somebody point me in the right direction and give me some pointers. Thanks

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• EBS+RAID10+XFS slower than EBS+RAID10+EXT3 using MySQL?

  - by Johann Tagle

  We're currently using EC2 with 16 EBS volumes in RAID10 configuration for our MySQL data. I know some people don't recommend to put EBS volumes to RAID but that's not what I'm concerned about at the moment. Current format is ext3, but we're experimenting with moving to xfs, given many reports that it is faster. However, we're actually experiencing a performance degradation when the partition was converted to xfs - a benchmark run with inserts, updates, selects and deletes was more than 10 seconds slower using xfs. Any idea what could be the problem? Below is the fstab entry (really only changed ext3 to xfs). Database tables are innodb and we are using innodb_file_per_table. /dev/mapper/vg_data-lv_data /data xfs noatime 0 0 Thanks.

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• Is there an application that can do a blue screen effect with a webcam?

  - by Axxmasterr

  Background: This is not the blue screen of death I am speaking of but the process called "Blue Screening" that takes and removes a particular colored background from an image so that it can be superimposed on some other video/still picture. If you have ever seen the weatherman stand in front of the map, then you have seen someone doing a blue screen technique. I would like to be able to capture video from my webcam, then send that video to a blue screen program which removes the white (or other color) from the background and then inserts a background of my own choosing. (think of the dead guy in freejack who was calling from all of the different places on earth) Then once the image is superimposed, I would like to pipe it into Skype for video conferencing. Anyone have a good way to do this?

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• What are performance limits of a database?

  - by Tommy

  What are some rough performance limits (read/s, write/s) for a single database server (no master-slave architecture), assuming storage on disk? How many read/s, write/s, depending on the kind of disk? (SSD vs non-SSD) , assuming simple operations (select one row by primary key, update one row, correctly indexed). I assume this limit is dependent on disk seek/write. EDIT: My question is more about getting rough metrics of the number of operations a database supports: to be able to know for example, if a new feature triggering 300 inserts/s can be supported without scaling out with additional servers.

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• Should I split my website into different servers

  - by Nyxynyx

  I have a website where a user uploads photos, the photos gets resized and thumbnailed, and stored on the server. At the same time, there are some INSERTS into a MySQL table regarding the photo uploaded (like description, user id etc). The site currently runs off a managed VPS, and I love the support it provides. However it is expensive to store the many small photos and the resizing and thumbnailing processes do cause spikes on the app performance. (Amazon S3 is pretty expensive, especially considering the costs for uploading many small files) Question: Will it be a good idea to move the image processing operations and image storage to another server which is an unmanaged dedicated server with a much lower cost/gb and keep the current VPS for its 24/7 support and hosting the webapp? Or should I move the entire site to the dedicated server? VPS Specs 16 cores 2.4GHz (E5620) 1GB memory 60GB Storage 3.5TB transfer $43/mth Managed (24/7) Dedicated Specs i3 2130 2 cores 3.4+ GHz 16 GB DDR3 2 x 1TB SATA2 storage 15 TB transfer $79/mth Unmanaged (Weekdays support) Software used Apache PHP MySQL Solr PostgreSQL ImageMagick

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• Determine Server specs for a Rails with MySQL database (on AWS)

  - by Rogier

  I developed a intranet applications with Rails (3.2) for one of my customers. There will be around 30-40 employees working with it. Backend is MySQL (5). What would be the best way to determine the servers specs needed? Given: max. load will be roughly 2400 (40*60) HTTP requests (mixed GET / POST) per hour. 15% of these calls are JSON calls (iOS) avg request will make between 5-10 database calls 500-800 SQL INSERTS per day webpages are fairly simple (no images, just text) avg webpage is 15 request (css/js/etc) and total size is 35-45 KB More specific, since they need access from multiple geographical locations, we are thinking of running a bitnami Ruby stack in the AWS cloud (uptime is important). Any thoughts on a AWS Instance (small/medium) and Utilization (light/medium/heavy) ? Thanks!

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• How to solve my black screen at boot?

  - by Juanillo

  I've got a friend with a weird problem. When he starts his computer the screen is completely black until the computer is completely started. So the screen is black until it suddenly shows the Windows desktop. He said that this is happening since a technical service repaired his computer, but that repair is not now in warranty. Recently the computer stopped working, but as the screen is black he cannot access to BIOS or start in safe mode (by pressing F8). When he inserts the Windows Vista DVD the system doesn't boot from DVD (it mustn't be configured in this way in the BIOS). Maybe there´s a problem with the hardware (maybe the graphic card)? Can anyone explain a reason why the screen is black during start-up? Any idea of what to do with the computer to restore it?

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• Linux IPv6: DHCP and /127 prefixes

  - by Jeff Ferland

  I've tried multiple pieces of DHCP client and software in attempting to setup a solution for allocating a /127 prefix to virtual machines so that each maintains its own layer 2 isolation. Because there would only be one host assigned to each network, a /64 is impractical. While the prefix size could reasonably be somewhere in the /64-127 range, the crux of the problem has been the same regardless of the software used in configuring: the DHCP call to bring up the interface uses the address advertised by DHCPv6 and inserts two routes: the /127 given by the router advertising packets and a /64 as well. Any thoughts on why I'm getting the additional route added across dhcp client vendors?

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• Django freezes when adding objects through the admin

  - by Quartz

  I have a Django 1.1 website running via Apache/mod_wsgi with a PostgreSQL 8.3.1 database. Recently, when I added objects through the admin interface, the connection froze up and I lost several worker processes, so I had to restart Apache. Upon trying to replicate this, I found that it only happens through the admin: if I go into the Django shell and issue the same insert, it works fine. Also, performing an UPDATE operation works without issues, so just INSERTs. I've rebuilt indexes on PostgreSQL and run a full VACUUM. Error logs don't show anything, and I can't figure out for the life of me what's wrong. Anyone have any ideas?

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• Black screen during startup

  - by Juanillo

  Hello, I've got a friend with a weird problem. When he starts his computer the screen is completely black untile the computer is completely started. So the screen is black until it suddenly shows the windows desktop. He said that this is happening since a technical service repaired his computer, but that repairment is not now in warranty. Recently the computer stopped working, but as the screen is black he cannot access to Bios or to secure start-up (by pressing F8). When he inserts the Windows Vista DVD the system doesn't boot from DVD (it musn't be configured in this way in the Bios.) Maybe there´s a problem with the hardware (maybe the graphic card). Can anyone explain a reason why the screen is black during start-up? Any idea of what to do with the computer to restore it? Thanks.

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• How to backup MySQL (mysqldump) when Memcached installed?

  - by cewebugil

  The server OS is CentOS, with Memcached installed Before Memcached installed, I use mysqldump -u root -p --lock-tables --add-locks --disable-keys --skip-extended-insert --quick wcraze > /var/backup/backup.sql But now, Memcached has been installed. According to Wikipedia; When the table is full, subsequent inserts cause older data to be purged in least recently used (LRU) order. This means new data entry is not directly saved in MySQL, but saved in Memcached instead, until limit_maxbytes is full, the least accessed data will be saved in MySQL. This means, some data is not in the MySQL but in Memcached. So, when backup, the new entry is not in the backup data What is the right way to backup?

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• Bind include all zones in a folder

  - by alexcepoi

  I have a webapp that acts as a DNS manager, writing all zones to "/var/named". I would like to be able to configure named to load all zones in that folder, without explicitely having to tell it which zone goes to which file. Is that remotely possible? The reason for this is that i will be having a lot of zones added/deleted and a lot of records for each of them. I was thinking for using a database for that, but the idea of doing 500 record inserts scares me (it needs to be snappy). It's easier to write to a file. Any suggestions?

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• High Lock Wait ratio in MySQL

  - by FunkyChicken

  on my site I log every pageview (date,ip,referrer,page,etc) in a simple mysql table. This table gets very little selects (3 per minute), but a lot of inserts. (about 100 per second) Today I changed this table from an InnoDB table to a MEMORY table, this made sense to me to prevent unnecessary hard disk IO. I also prune this table once per minute, to make sure it never get's too big. -- Performance wise, things are running fine. But I noticed that while running tuning-primer, that my Current Lock Wait ratio is quite high. Current Lock Wait ratio = 1 : 561 My question: Should I worry about this Lock Wait Ratio? And is there something I can change in my my.cnf to improve things so that the lock wait ratio isn't so high?

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• Extracting a line section of mysql backup using sed

  - by carpii

  I occasionally need to extract a single record from a mysqlbackup To do this, I first extract the single table I want from the backup... sed -n -e '/CREATE TABLE.*usertext/,/CREATE TABLE/p' 20120930_backup.sql > table.sql In table.sql, the records are batched using extended inserts (with maybe 100 records per insert before it creates a new line starting with INSERT INTO), so they look like... INSERT INTO usertext VALUES (1, field2 etc), (2, field2 etc), INSERT INTO usertext VALUES (101, field2 etc), (102, field2 etc), ... Im trying to extract record 239560 from this, using... sed -n -e '/(239560.*/,/)/p' table.sql > record.sql Ie.. start streaming when it finds 239560, and stop when it hits the closing bracket But this isnt working as I hoped, it just results in the full insert batch being output. Please can someone give me some pointers as to where Im going wrong? Would I be better off using awk for extracting segments of lines, and use sed for extracting lines within a file?

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• How can one implement RAID1 with a Dell Latitude laptop containing one normal hard drive, and one hard drive in an external bay?

  - by user12583188

  OS: Win7 professional Laptop: latitude e6420 The answer to this question should address how to deploy RAID1 software wise on a dell latitude e6420. I have two Hitachi Z5K500 320GB drives (new). There is one hard drive (320GB capacity) in the system now, which contains the current installation that I would prefer to keep. The drive currently inside the laptop will be replaced with one of the Hitachi drives, and the other Hitachi drive will be fitted into the laptop by way of a Dell hard drive "caddy" enclosure, which inserts into the media bay of the laptop (you remove the cd-rom bay, insert hd-bay).

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• How can I turn off calculated columns in an Excel table from a macro using VBA?

  - by user41293

  I am working on a macro that inserts formulas into a cell in an Excel table. The Excel table does the automatic filling of columns and fills all the cells in that column with the formula, but all I want is one cell to have the formula. I cannot just turn off automatic formula for tables as I need to have other people use this worksheet on their systems. Is there a way to turn off the automatic filling of formulas in a table using VBA in a macro? It just needs to be temporary: I just want to turn it off, put in my formulas, then turn it back on.

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• How to choose NoSQL database engine?

  - by Poma

  We have a database with following specs: 30k records, 7mb in size 20 inserts/second 1000 updates/second 1000 range selects/second, by secondary index, approx 10 rows each needs at least one secondary index needs some mechanism to expire keys if they are not updated for 75 secs (can be done via programmatic garbage collector but will require additional 'last_update' index and will add some load) consistency is not required durability is not required db should be stored in memory For now we use Redis, but it does not have secondary index and it's keys index:foo:* is too slow. Membase also does not have secondary index (as far as I know). MongoDB and MySQL memory engine have table-level locks. What engine will fit our use case?

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