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• SQL Server Database In Single User Mode after Failover

  - by jlichauc

  Here is a weird situation we experienced with a SQL Server 2008 Database Mirroring Failover. We have a pair of mirrored databases running in high-availability mode and both the principal and mirror showed as synchronized. As part of some maintenance I triggered a manual failover of the principal to the mirror. However after the failover the principal was now in single-user mode instead of the expected "Principal/Synchronized" state we usually get. The database had been in multi-user mode on the previous principal before this had happened. We ended up stopping all applications, restarting the SQL Server instances, and executing "ALTER DATABASE ... SET MULTI_USER" to bring the database back to the expected "Principal/Synchronized" state in a multi-user mode. Question. Does anyone know where SQL Server stores information about whether a database should be in single-user mode or not? I'm wondering if there is some system database or table that has this setting recorded somewhere. In particular we had an incident once with the database on the original principal (the one I was failing over to) where when trying to detach the database it was put into single-user mode. I'm wondering if that setting is cached somewhere and is the reason that SQL Server put it back into single-user mode after a failover.

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• Testing realistic loads for new versions of existing web app

  - by David Cournapeau

  Assuming I have a relatively complex web application, I am interested in testing performances of a new version using a traffic as realistic as possible. Traffic is relatively complex (session-based, lots of internal logic which depends on incoming requests). The webapp depends on many servers (databases, frontends, etc...). I can think of two basic directions: Recording every incoming request with its timestamp in production in a centralized manner and replaying it from N clients to reproduce a load as close as possible as the original. Issue: because we have many servers, getting the centralized log is not trivial. having a system duplicating requests to a staging area so that I could "plug" a dev version of my webapp to it at anytime without affecting the production. Issue: I have not found much information about it expect this, which suggests to me that may not be the best solution. OTOH, it is realistic by definition. What is the standard way of doing this kind of testing ? I did not find much information about load testing with complex, realistic traffic.

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• Moving a lotus database causes incoming mail failure

  - by Logman

  Hey all, I moved a couple lotus note databases to another hd (ran out of space) by using a directory link/pointer on the domino server. USed a text file with the .DIR ext with the desired new path etc... well that works fine. I open up a lotus notes client, use the id and then OPEN the database. The directory link works fine, the new location of the db is opened with no problems. We found out that we couldnt FORWARD any mail: We did the following to make it work: Goto menu FILE|MOBILE|EDIT CURRENT LOCATION Goto tab MAIL and enter the correct path for "Mail File:" example: it should read "mail\morespace\flabor" and not "mail\flabor" "morespace" = directory link/pointer we can forward and reply to emails fine after that fix. The problem is that the user has no incoming email. Domino is still trying to send the incoming mail of that user to its old db location "mail\flabor" instead of "mail\morespace\flabor". Delivery error saying user does not exist. Is this a cache problem? We have reset the server ("Q" at the prompt), though we have not completely shut it down though. Thanks Frank

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• Oracle logical standby fails with ORA-01919

  - by DCookie

  I have an Oracle logical standby database being managed via data guard. Just this morning the redo apply process began failing with an ORA-01919 error, indicating one of our application roles did not exist. However, I can see the role on both primary and standby databases. We also have a physical standby that has long since applied the redo where this is happening on the logical, without issue. I have opened an SR with Oracle. I was wondering if anyone out there has seen this before. I guess I should mention: Oracle 10.2.0.4, Win2003 Server SP2. UPDATE: So far, Oracle Support has not provided an answer. I thought I'd post here what I have learned so far. It appears that a grant of DBA on the primary host to a role works fine for users granted the role. It does not work on the logical standby. IOW: create role TEST; grant dba to TEST; grant TEST to auser; connect auser set role TEST; grant <existing role> to <existing user>; This works on the primary instance but fails on the logical. A workaround appears to be to grant each role on the primary to the role TEST with admin option in the logical: grant <existing role> to TEST with admin option; <== do this on the logical standby Then the command works on the logical standby.

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• Best tool for monitoring backups, etc. and trending statstics from that data

  - by Randy Syring

  I have done some research on nagios, opennms, and zenoss but am not confident that I have found what I am looking for. The main driving force for me right now is being able to monitor backups. This includes mysql, mssql, and eventually some file system backups. We have a tool that wraps the backup process for these different systems and collects statistics. So, items like: number of databases backed up size of db backup file size of db backup file compressed time to make backup time to zip file I want to be able to A) have notifications if the jobs are not run according to schedule B) be able to set thresholds on the statistics which would trigger notifications C) I want to be able to trend and graph the statistics I am planning on sending this information to the monitoring application through an HTTP POST. Or, the monitoring application could pull it from a log file as well. However, we will have other processes with other "arbitrary" (from the monitoring system's perspective) statics that will want to monitor and trend, so flexibility is very important. The tool or tools should also be able to do general monitoring and trending of network interfaces, server load, etc. Once we get the backup monitoring in place, we will want to include those items as well. Thanks.

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• How do I secure Sql Server 2008 R2

  - by Mark Tait

  I have both a dedicated and a VPS (from Fasthosts) virtual server - the web sites/applications I run on these, access Sql Server stored on the same web server. Until now, I have logged onto Sql Server on both the deidicated and VPS server, from Sql Server Management Studio - until I noticed in my server application logs, multiple attempts to logon to Sql Server using the 'sa' username, but failed password. So someone/bot is trying hard (repeatedly every couple of hours, for approx 20 attempts during each instance) to log on... so obviously I have to lock down access to Sql Sever remotely. What I have done is gone into Configuration Manager, and in Sql Server Network Configuration - Protocols for Sql2008 and also in Sql Native Client 10.0 Configuration - Client Protocols - I have diabled Named Pipes, TCP/IP (and VIA by default). I have left Shared Memory enabled. I also disabled in Sql Server Services, the Sql Server Browser. Now the only way I can manage the databases on these servers, is by logging on to them via Remote Desktop. Can anyone confirm if this is the correct way of stopping anyone maliciously logging on to Sql Server? (I'm not a DBA or security expert - and there are hundreds of articles advising all different ways - but I was hoping for the experts here to confirm, or otherwise, if what I've done is correct) Thank you, Mark

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• VMWare Setup with 2 Servers and a DAS (DELL MD3220)

  - by Kumala

  I am planning to use a VMWare based setup consisting of two VMWare servers (2 CPU, 256GB Memory) and a DAS (DELL MD3220 with 24x900GB disks). The virtual machines will be half running MS SQL databases (Application, Sharepoint, BI) and the other half of the VM will be file services, IIS. To enhance the capacity of the storage, we'll be adding a MD1220 enclosure with another 24x900GB to the MD3220. Both DAS will have 2 controllers. Our current measured IOPS is 1000 IOPS average, 7000 IOPS peak (those happen maybe twice per hour). We are in the planning phase now and are looking at the proper setup of the disks. The intention is to setup up both DAS one of the DAS with RAID 10 only and the other DAS with RAID 5. That will allow us to put the applications on the DAS that supports the application performance needs best. Question is how best to partition the two DASs to get best possible IOPS/MBps, each DAS will have to have 2 hot spares? For the RAID 5 Setup: Generally speaking, would it be better to have one single disk group across all 22 disks (24 - 2 hot spares) with both controllers assigned to the one disk group or is it better to have 2 disk groups each 11 disks, assigned to one of the two controllers? Same question for the RAID 10 setup: The plan is: 2 disks for logs (Raid 1), 2 Hotspare and 20 disks for RAID 10. Option 1: 5 * 4 disks (RAID 10), with two groups assigned to 1 controller and 3 groups to the other controller Option 2: One large RAID 10 across all the disks and have both controllers assigned to the same group? I would assume that there is no right or wrong, but it all depends very much on the specific application behaviour, so I am looking for some general ideas what the pros and cons are of the different options. IF there are other meaningful options, feel free to propose them.

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• Tools to manage sql 2008 database mirroring?

  - by lemkepf

  We are going to be moving about 20 databases that live on a single instance of sql 2000 to a sql 2008 r2 environment with database mirroring. What I'm looking for is a tool or scripts that will help me manage the conversion and management of those 20db's onto this new mirrored environment easily. There are many steps in setting each DB up and I want to automate as much as possible. Edit: Here are the steps I've been doing manually: Create the same username/passwords from the old sql 2000 server onto new sql 2008 server. Then sync those users/passwords onto the other sql 2008 server with the same SSID's so when we do the db backup and restore they match up. Take a backup of each sql 2000 db's. Copy them to server A. Restore the backup to server A. Backup from server a, copy to server b, restore there. Run the mirror "configure security" wizard. Start mirroring. I've love to be able to script this out or have a tool that does it for me. Thanks! Paul

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• How should I configure nginx caching headers for a "baked" static file blog? (Octopress)

  - by Doug Stephen

  I recently deployed an Octopress blog (which is a blogging platform built around Jekyll). It's a static-site blog generator, with no dynamic content or databases to muck about with. It's being served up by nginx. My question is, what is the appropriate expires directive or Cache-Control header that I should set to make sure that visitors get the most up-to-date version of the site when they visit without having to manually refresh? Since the site is just .html files it seems to get cached pretty aggressively. I've tried a million different combinations of expires modified + xxxx and even straight up expires off but I can't seem to wrap my head around it. I'm very new to dealing with caching like this, specifically, on static files that change frequently, and obviously if the site hasn't been changed then I'd like for it to be served up out of the cache. Update (still not solved though): I found open_file_cache, tweaked that. Still no dice. It seems like what I might want to do is use nginx as a proxy cache and use Apache with ETags? Is there really no convenient way to make nginx play nicer with conditional requests from the client? TL;DR: I'm running a static-file blog and I'd like to set up nginx to only serve from the cache if the blog hasn't been updated recently, but I'm too stupid to figure it out myself because I'm relatively new to web servers.

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• 100% CPU load on Ubuntu 10.04.3 LTS 64bit

  - by deadtired

  I have 2 days since I am trying to fix this issue, with no success. The server is a mysql database server. Hardware: DELL Poweredge 1950, 2x Intel Xeon Quad Core E5345 @ 2.33GHz, 16 Gb mem, 2x 146Gb SAS (software RAID1) Software: Ubuntu 10.04.3 LTS, MySQL 5.1.41 Issue: while mysql is not used and runs with no database, everything seems alright. As soon as I install a database, it has the reason to bring all 8 cores in 100% with low memory consumption. So, you can imagine the load average goes high (I saw 212 load average for the first time). The server doesn't become unresponsive, but you can see it's slow while browsing the project installed. Additional info: the database used is not more than 24MB and it was moved from a server with less resources and a lot more larger databases. So it's not the database/project. my.cnf is not a reason also, as I used both default one and the one I use on the same distribution on another server.What is interesting is that mysql doesn't close any process and runs to the limit of the max_connections. Logs are quiet. Nothing there. I switched to this Ubuntu version after I suspected some problems in the newly Ubuntu 11.10 server. This one worked alright for an hour after I made a kernel upgrade to 3.0.1 (it was using the memory also) I tested disk speed and seems alright. Some more output on the running server: dstat -cndymlp -N total -D total 3: htop command: Idea? Did anyone meet the same problem? Any fix you can think of?

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• Migrate openldap users and groups

  - by user53864

  I have an OpenLDAP server running on one of my ubuntu 8.10 servers. I used command-line only for OpenLdap installation and some basic configurations, everything else I'll configure with the Webmin gui tool. I'm trying to migrate to ubuntu 10.04 and I was able to migrate all other servies, application and databases but not the ldap. I'm an ldap beginner: I have installed OpenLDAP server and client on ubuntu 10.04 server using the link and used the following command to export and import ldap users and groups To export from 8.10 server slapcat > ldap.ldif To import to 10.04 server Stop ldap and slapadd -l ldap.ldif and Start ldap Then I accessed Webmin and checked in Ldap users and groups and I could see all the users and groups of my old ldap server.Whenever I create an ldap user from the webmin(in 8.10 or 10.04) a unix user is also created with the home directory under /home. But the imported users in 10.04 from 8.10 are not present as a unix user(/etc/passwd). How could I make the ldap users available as a unix user, is there any perfect way to export and import?. I also wanted to check the ldap users from the terminal that if password is exported properly but I don't know how to access the ldap users which are not available as unix users. On 8.10, I just use su - ldapuser and it is not working in the 10.04 as unix users are not created for the exported ldap users. If every thing works fine then the CVS works as it is using ldap authentication. Anybody could help me?

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• Best Practices for adding Exchange Archive to current 3 server setup

  - by ADquestion

  I'm looking to add an Archive Database (which I know is just a Mailbox Database) to our current Exchange 2010 environment. I have done this in the past at a previous job, but we had a simpler setup than at this current job. I've been trying to find some best practices to make sure it's setup in an ideal way, but so far not finding the details I would prefer. Hoping someone on here can give me a few pointers. Currently we have a 3 server setup, Server1, Server2 and Server3. Three databases of course, DB1, DB2 and DB3. We have a DAG setup between them. Server1 has DB1 and DB3 on it, DB1 is not active, DB3 is active. Server2 has DB1 and DB2 on it, both are active. Server3 has DB2 and DB3 on it, both are not active. All three servers are virtual (VMware). Each one is setup identical to the other as follows: C:\ 60GB - OS E:\ 600GB - DB (currently only 90GB used, pointing to Datastore just for Server2) F:\ 200GB - Log (2GB used, pointing to same Datastore as above) G:\ 200GB - Restore (0 used, pointing to same Datastore as above) The drives are all set to Thin Provisioning, and it looks as though I have 600GB of available space. They have not been on Exchange that long and only have about 70GB worth of PSTs to import back in that will be going to the Archive Database, plus anything older than 2 years from their current inbox that will be moved into there. I was considering placing the Archive DB on the E:\ drive of Server3 (only) like the current DB, but wasn't sure if that was acceptable. I don't plan on setting the Archive DB up with the DAG, just plan on having it as a single repository for older emails and manually back it up every now and then. If anyone has any suggestions on this I would appreciate it the input. I've done it on a slightly smaller scale before and it worked well, but like to think it through before pulling the trigger, especially at a new job. :) Thanks again!

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• Give access to specific services on Windows 7 Professional machines?

  - by Chad Cook

  We have some machines running Windows 7 Professional at our office. The typical user needs to have access to stop and start a service for a local program they run. These machines have a local web server and database installed and we need to restrict access to certain folders and services related to the web server and database for these users. The setup I have tried so far is to add the typical user as a Power User. I have been able to successfully restrict them from accessing certain folders (as far as I can tell) but now they do not have access to the service needed for starting and stopping the local program. My thought was to give them access to the specific service but I have not had any luck yet. In searching the web for solutions the only results I have found relate to Windows Server 2000 and 2003 and involve creating security templates and databases through the Microsoft Management Console. I am hesitant to try an approach like this as these articles are typically older and I worry this method is outdated. Is there a better way to accomplish the end goal of giving the user permission to run the service and restrict their access to certain folders? If any clarification is needed on the setup or what we are trying to achieve, please let me know. Thanks in advance.

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• Percona-server time out on /etc/init.d/mysql start

  - by geekmenot

  Every time I start mysql, using /etc/init.d/mysql start or service mysql start, it always times out. * Starting MySQL (Percona Server) database server mysqld [fail] However, I can get into mysql. Just wanted to know if there is a problem with the install because it happens all the time, not a one off error. mysql-error.log shows: 121214 11:25:56 mysqld_safe Starting mysqld daemon with databases from /data/mysql/ 121214 11:25:56 [Note] Plugin 'FEDERATED' is disabled. 121214 11:25:56 InnoDB: The InnoDB memory heap is disabled 121214 11:25:56 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121214 11:25:56 InnoDB: Compressed tables use zlib 1.2.3 121214 11:25:56 InnoDB: Using Linux native AIO 121214 11:25:56 InnoDB: Initializing buffer pool, size = 14.0G 121214 11:25:58 InnoDB: Completed initialization of buffer pool 121214 11:26:01 InnoDB: Waiting for the background threads to start 121214 11:26:02 Percona XtraDB (http://www.percona.com) 1.1.8-rel29.2 started; log sequence number 9333955393950 121214 11:26:02 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306 121214 11:26:02 [Note] - '0.0.0.0' resolves to '0.0.0.0'; 121214 11:26:02 [Note] Server socket created on IP: '0.0.0.0'. 121214 11:26:02 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.005163' at position 624540946, relay log '/data/mysql/mysql-relay-bin.000043' position: 624541092 121214 11:26:02 [Note] Slave I/O thread: connected to master '[email protected]:3306',replication started in log 'mysql-bin.005180' at position 823447620 121214 11:26:02 [Note] Event Scheduler: Loaded 0 events 121214 11:26:02 [Note] /usr/sbin/mysqld: ready for connections. Version: '5.5.28-29.2-log' socket: '/data/mysql/mysql.sock' port: 3306 Percona Server (GPL), Release 29.2

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• Installing and running two postgresql versions on different ports (or two instances of same server)

  - by Andrius

  I have postgresql 9.1 installed on my machine (Ubuntu). I need another postgresql server that would run next to the old one. Exact version does not matter, but I'm thinking of using 9.2 version. How could I properly install and run another postgresql version without screwing old one (like upgrading). So those versions would run independently on different ports. Old one on 5432 and new one on 5433 for example. The reason I need this is for two OpenERP versions databases. If I run two OpenERP servers (with different versions) on single postgresql port, it crashes because new OpenERP version detects old versions database and tries to run it, but it crashes because it uses another schemes. P.S or maybe I could just run same postgresql server on two ports? Update So far I tried this: /usr/lib/postgresql/9.1/bin/pg_ctl initdb -D main2 It created new cluster. I changed port to 5433 in new clusters directory postgresql.conf file. Then ran this: /usr/lib/postgresql/9.1/bin/pg_ctl -D main2 -l logfile start I got response server starting. But when I tried to enter new cluster's template database with: psql template1 -p 5433 I got this error: psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5433"? Also now when I try to stop server with: /usr/lib/postgresql/9.1/bin/pg_ctl -D main2 -l logfile start I get this error: pg_ctl: PID file "main2/postmaster.pid" does not exist Is server running? So I don't understand if server is running and what I'm missing here? Update Found what was wrong. Stupid me. I didn't notice that when I changed port in .conf file, that line was commented already. So actually I didn't change anything first time, but thought I did and it used default 5432 port.

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• How to connect to a remote server and run some code on that particular server?

  - by seedeg

  I am implementing an automated backup scheme so I created a shell script which first creates SQL Dumps for all MySQL databases, then it retrieves all the websites from the /var/www of a remote server. The latter is working as I am using rsync to get the remote files. However, obviously, the MySQL dumps being retrieved are the ones on the local server which is not what I want. I want to get the SQL Dumps from the remote server as well. I have a tunnel between the local and remote server which I can connect without using any password (I added the public key to the authorized_hosts), so I tried to add the following code to the script: ssh [email protected] Then I tried to retrieve the SQL dumps and then I exit from the remote server. However this does not work as I still have to enter exit manually in the terminal for the SQL dumps to be retrieved from the remote host. I don't know why this is happening. Basically this is what the script is trying to do: //connect to remote server ssh [email protected] //retrieve SQL dumps //code to retrieve... //exit from remote server exit //use rsync to get remote files of /var/www from local server (working) Is there a way to connect to the remote host AND run the script's code ON THAT remote host? Many thanks in advance

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• What kind of server attacks should i be aware of nowadays

  - by Saif Bechan

  I am recently running a web server, and there is a lot of information online, but it can all be a little confusing. I recently opened my logwatch logs and saw that i get attacked a lot by all sorts of bots. Now I am interested in a list with things I definitely should be aware of nowadays, and possible ways to prevent them. I have read stories about server crashed by floods, crashed by email, and all sorts of crazy stuff. Thing I already did: I have recently blocked all my ports, except for the http and email ports. I disabled IPv6, this was giving me a lot of named errors I have turned on spam DNS blackhole lists to fight spam - sbl.spamhaus.org; - zen.spamhaus.org; - b.barracudacentral.org; I installed and configured mod_security2 on apache There is no remote access possible to my databases That is all i did so far, further I am not aware of any other threats. I want to know if the following things have to be protects. Can I be flooded by emails. How can i prevent this Can there be a break in or flood of my databses Are there things like http floods or whatever Are there any other things i should know before i go public with my server I also want to know if there is some kind of checklist with must-have security protections. I know the OWASP list for writing good web applications, is there something for configuring a server.

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• Redirect 301 fails with a path as destination

  - by Martijn Heemels

  I'm using a large number of Redirect 301's which are suddenly failing on a new webserver. We're in pre-production tests on the new webserver, prior to migrating the sites, but some sites are failing with 500 Internal Server Error. The content, both databases and files, are mirrored from the old to the new server, so we can test if all sites work properly. I traced this problem to mod_alias' Redirect statement, which is used from .htaccess to redirect visitors and search engines from old content to new pages. Apparently the Apache server requires the destination to be a full url, including protocol and hostname. Redirect 301 /directory/ /target/ # Not Valid Redirect 301 /main.html / # Not Valid Redirect 301 /directory/ http://www.example.com/target/ # Valid Redirect 301 /main.html http://www.example.com/ # Valid This contradicts the Apache documentation for Apache 2.2, which states: The new URL should be an absolute URL beginning with a scheme and hostname, but a URL-path beginning with a slash may also be used, in which case the scheme and hostname of the current server will be added. Of course I verified that we're using Apache 2.2 on both the old and the new server. The old server is a Gentoo box with Apache 2.2.11, while the new one is a RHEL 5 box with Apache 2.2.3. The workaround would be to change all paths to full URL's, or to convert the statements to mod_rewrite rules, but I'd prefer the documented behaviour. What are your experiences?

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• Backing up large network (~200 clients) -- Enough Bandwidth?

  - by mtkoan

  My company wants to institute a backup plan for all of the clients on our network, which is about 200. We back up our servers and SQL databases regularly, but its been our policy to not backup individuals. What is most critical for people is their Documents and PST files in Outlook. PST files can be very large, and most people's are ~1-1.5 GB around here. So with PST files alone that is 200-300 GB of data needing to be transferred daily to a sever for backup. Or compressing first, then transferring, but many of the machines are VERY old and such a task would grind their computer to a halt. Isn't this the reason networks use things like VMware -- to reduce network traffic and streamline backups? Or is this only to reduce hardware costs? Would this much network traffic everyday drastically slow down our network? Enough to the point we'd have to mandate it to be done at night only? Or could we stagger then through out the day? Really appreciate any input, thank you.

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• Adding 2nd DC to the domain from a different subnet over VPN.

  - by EagerToLearn

  I'm in the process of adding a second DC to our domain and just want to make sure I have all the steps right before proceeding. Info: DC1 is 2008 R2 Standard. DC2 is 2008 R2 Standard. Network1 is 192.168.39.x/24 Network2 is 10.0.0.x/24 VPN is Sonicwall. The 2 DC's will be at two different sites, but the networks are connected by hardware VPN. (Sonicwall). The main DC server will be on the 192.168.39.0/24 network. The 2nd DC will be on 10.0.0.0/24. Here are the steps I plan to take; please let me know if I'm missing anything. Part 1: AD Sites and Services on DC1, create a new site and subnet for DC2. (Or should I create a new one for both?) (Can I use the default IPSiteLink and not change anything in there other than refresh timer?) Part 2: Point the DNS of DC2 to DC1. Run /forestprep and /domainprep (on both, or just DC1?). Dcpromo and select "Additional Domain Controller for Existing Domain". Then continue with normal steps with default locations for databases. EDIT: Didn't realize this was like reddit and required two skipped lines to skip one :P EDIT 2: When DCPromo-ing DC2, do I need to have "Append primary and connection specific DNS" and "Append parent suffixes of the primary DNS suffix" checked?

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• What is the fastest way to clone an INNODB table within the same server?

  - by Vic

  Our development server is a replication slave of our production server. We have a script that developers use if they want to run their applications/bug fixes against fresh data. That script looks like this: dbs=( analytics auth logs users ) server=localhost conn="-h ${server} -u ${username} --password=${password}" # Stop the replication client so we don't encounter weird data. echo "STOP SLAVE" | mysql ${conn} # Bunch of bulk insert optimizations echo "SET autocommit=0" | mysql ${conn} echo "SET unique_checks=0" | mysql ${conn} echo "SET foreign_key_checks=0" | mysql ${conn} # Restore all databases and tables. for sourcedb in ${dbs[*]} do destdb=${prefix}${sourcedb} echo "Dropping database ${destdb}..." echo "DROP DATABASE IF EXISTS ${destdb}" | mysql ${conn} echo "CREATE DATABASE ${destdb}" | mysql ${conn} # First, all the tables. for table in `echo "SHOW FULL TABLES WHERE Table_type <> 'VIEW'" | mysql $conn $sourcedb | tail -n +2`; do if [[ "${table}" != 'BASE' && "${table}" != 'TABLE' && "${table}" != 'VIEW' ]] ; then createTable=`echo "SHOW CREATE TABLE ${table}"|mysql -B -r $conn $sourcedb|tail -n +2|cut -f 2-` echo "Restoring ${destdb}/${table}..." echo "$createTable ;" | mysql $conn $destdb insertData="INSERT INTO ${destdb}.${table} SELECT * FROM ${sourcedb}.${table}" echo "$insertData" | mysql $conn $destdb fi fi done done echo "SET foreign_key_checks=1" | mysql ${conn} echo "SET unique_checks=1" | mysql ${conn} echo "COMMIT" | mysql ${conn} # Restart the replication client echo "START SLAVE" | mysql ${conn} All of these operations are, as I mentioned, within the same server. Is there a faster way to clone the tables I'm not seeing? They're all INNODB tables. Thanks!

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• SQL Server performance on VSphere 4.0

  - by Charles

  We are having a performance issue that we cannot explain with our VMWare environment and I am hoping someone here may be able to help. We have a web application that uses a databases backend. We have an SQL 2005 Cluster setup on Windows 2003 R2 between a physical node and a virtual node. Both physical servers are identical 2950's with 2x Xeaon x5460 Quad Core CPUs and 64GB of memory, 16GB allocated to the OS. We are utilizing an iSCSI San for all cluster disks. The problem is this, when utilizing the application under a repeated stress testing that adds CPUs to the cluster nodes, the Physical node scales from 1 pCPU to 8 pCPUs, meaning we see continued performance increases. When testing the node running Vsphere, we have the expected 12% performance hit for being virtual but we still scale from 1 vCPU to 4 vCPUs like the physical but beyond this performance drops off, by the time we get to 8 vCPUs we are seeing performance numbers worse than at 4 vCPUs. Again, both nodes are configured identically in terms of hardware, Guest OS, SQL Configurations etc and there is no traffic other than the testing on the system. There are no other VMs on the virtual server so there should be no competition for resources. We have contacted VMWare for help but they have not really been any suggesting things like setting SQL Processor Affinity which, while being helpful would have the same net effect on each box and should not change our results in the least. We have looked at all of VMWare's SQL Tuning guides with regards to VSphere with no benefit, please help!

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• Multiple servers vs 1 big server performace

  - by pistacchio

  Hi to all! My team of developers has suggested a server structure for an upcoming project we are developing. Our structure is "logical", meaning that the various logical components of the application (it is a distributed one) relies on different servers. Some components are more critical than others and will be subjected to more load. Our proposal was to have 1 server per component but the hardware guys suggested to replace the various machines with a single, bigger one with virtual servers. They're gonna use Blade Servers. Now, I'm not an expert at all, but my question to the guys was: so if we need, for example, 3 2GHz CPU / 2GB RAM machines and you give me 1 machine with 3 2GHz CPUs and 6 GB of RAM it is the same? They told me it is. Is this accurate? What are the advantages or disadvantages of both the solutions? What are the generally accepted best practices? Could you point out some URL reference dealing with the problem? Thank you in advance! EDIT: Some more info. The (internet / intranet) application is already layered. We have some servers on the DMZ that will expose pages to the internet and the databases are on their own machines. What we want to split (and they want to join) are some webservers that mainly expose webservices. One is a DAL that communicates with the database layer, one is our Single Sign On / User Profile application that gets called once per page and one is a clone of what seen on the Internet to be used on our lan.

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• Spreadsheet application that can handle big data OS X

  - by Peter

  I've been working with Excel for quite a while for some statistical analysis that I do regularly. The size of the data that I'm working with has gotten much larger as of late, however. The layout of the databases in question is quite simple, usually just three rows which includes a UNIX timestamp, and EST value, a proprietary numeric value and finally an average of the rows that have a timestamp +/- 1000 that row's timestamp (little AVERAGEIFS() formula). That formula and the EST conversion are the only formulas in the sheet. I'm beginning to work with files with 500,000+ rows. Running the average formula down the entire row takes forever. The end result is the production of print-worthy graphs. I'm looking for either a UNIX CL utility or separate spreadsheet/database application that can handle this amount of data without melting my CPU or making me wait an hour. Is there anything out there? TL;DR: Simple excel sheet with over half a million rows is getting too slow to work with. OS X alternatives?

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• Updated my WAMP Server and MySQL is eating up 580mB of memory

  - by Jon

  I updated my dev-box's WAMPSERVER, and along with updating PHP and Apache, MySQL updated to '5.6.12'. After doing that, I copied the data folder from my old (5.1.36) install to the new one and now MySQL takes up 580mB which is way too much, since I'm the only person using it (Locally) and there are only 20 or so databases on it, none of which have 'memory' tables. How can I get this down to a decent amount? My my.ini: # For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the # *** default location during install, and will be replaced if you # *** upgrade to a newer version of MySQL. [mysqld] # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin # These are commonly set, remove the # and set as required. # basedir = ..... # datadir = ..... # port = ..... # server_id = ..... # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES Database info: Storage Engine Data Size Index Size Total Size InnoDB 48.00 KB 0.00 B 48.00 KB MEMORY 0.00 B 0.00 B 0.00 B MyISAM 163.64 MB 122.49 MB 286.13 MB Total 163.69 MB 122.49 MB 286.18 MB

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