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• MySQL Locking Up

  - by Ian

  I've got a innodb table that gets a lot of reads and almost no writes (like, 1 write for every 400,000 reads approx). I'm running into a pretty big problem though when I do INSERT into the table. MySQL completely locks up. It uses 100% cpu, and every single other table (in other databases even) have their statuses set to "Locked" until the INSERT is done. This is a big problem because MySQL stays locked up for up to 4 minutes. I'm using version 5.1.47 (rpm from mysql.com). Any ideas?

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• General High-Level Assessment

  - by tcarper

  Guys and Gals, I've been tasked with a doozy of an assignment. The objective is something akin to "laying of hands" on several database servers which work in concert to provide data to various Web, Client-Server and Tablet-Sync'd distributed Client-Server programs. More specifically, I've been asked to come up with a "Maintenance Plan" which includes recommendations for future work to improve these machines' performance/reliability/security/etc. Might there be some good articles on teh interwebs ya'll could point me towards which would give me some good basis to start? Articles describing "These are the top 4 overarching categories and this is how you should proceed when drilling down on each of them" sort-of-thing would be fabulous. The Databases are all SQL 2005, however the compatibility level is 80 and they were originally created with ERwin based on SQL 6.5. The OSs are all Windows Server 2003. Thanks all! Tim

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• Best practice for scaling a single application source to multiple nodes

  - by Andrew Waters

  I have an application which needs to scale horizontally to cover web and service nodes (at the moment they're all on one) but interact with the same set of databases and source files (both application code and custom assets). Database is no problem, it's handled already with replication in MongoDB. Also, the configuration of the servers are the same (100% linux). This question is literally about sharing a filesystem between machines so that its content is always correct, regardless of the node accessing it. My two thoughts have so far been NFS and SAN - SAN being prohibitively expensive and NFS seeing some performance issues on the second node with regards to glob()ing in PHP. Does anyone have recommended strategies or other techniques that don't involved sharding data across nodes or any potential gotchas in NFS that may cause slow disk seek times? To give you an idea of the scale, the main node initialises it's application modules in ~ 0.01 seconds. The secondary is taking ~2.2 seconds. They're VM's inside a local virtual network in ESXi and ping time between them is ~0.3ms

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• Mirroring MySQL server with diffrent configuration

  - by HTF

  I have to migrate MySQL server to a different data centre so I would like to create another MySQL slave server in new DC and then promote it to a master later on. I previously used LVM snapshots and Percona Xtrabackup for this purpose but this time I've optimized MySQL configuration file that prevents me from using these methods. Old server (backup): innodb_log_file_size = 256M innodb_log_files_in_group = 3 New server (restore): innodb_log_file_size = 512M innodb_log_files_in_group = 2 The Xtrabackup script and LVM snapshots copy the whole directory structure so the MySQL server won't start because there is a different size for InnoDB logs. Is there any solution to avoid a downtime in this case? I can't use mysqldumps as there is around 8000 databases so I would have to take the server down for a couple of hours. I was also thinking to use the old settings with Xtrabackup and then change it once the new server is promoted to a master - less downtime but I'm not sure if this will work? Thank you Regards

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• Cannot Login To phpMyAdmin

  - by Zach Dziura

  I'm running a simple LAMP server at home from which I host a personal blog. The server is running Arch Linux, with the latest-and-greatest versions of Apache, MySQL, and PHP. In order to easily maintain the databases, I installed phpMyAdmin. However, I cannot login. If I were to SSH into the server and run mysql -u <user> -p <password>, no errors show up and I'm immediately placed into the MySQL prompt. No problem. However, when I try to log in with phpMyAdmin, using those exact same credentials, nothing happens. No errors, no nothing, I'm just redirected back to the login page. Did I do something wrong? Thanks in advance for any and all answers!

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• Putting our OLTP and OLAP services on the same cluster

  - by Dynamo

  We're currently in a bit of a debate about what to do with our scattered SQL environment. We are setting up a cluster for our data warehouses for sure and are now in the process of deciding if our OLTP databases should go on the same one. The cluster will be active/active with database services running on one node and reporting and analytical services on the other node. From a technical standpoint I don't see an issue here. With the services being run on different nodes they shouldn't compete too heavily for resources. The only physical resource that may be an issue would be the shared disk space. Our environment is also quite small. Our biggest OLAP database at the moment is only about 40GB and our OLTP are all under 10GB. I see a potential political issue here as different groups are involved but I'm just strictly wondering if there would be any major technical issues that could arise from this setup.

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• Shared storage solution for our sql server backups

  - by Gokhan

  We have 3 clustered sql servers. We have 5+ multi terrabyte databases and their backup files (compressed using quest litespeed) are hitting over 600gb each, We are required to keep at least a week or two weeks (if we can) of weekly full backups and then 6 days differential backups, and a week or 2 weeks worth of log backups local. We are currently limited to 2TB volumes from our san team, we can have multiple volumes but they are expensive ($200 per raw TB per month) and having to deal with many backup volumes instead of a single big volume is difficult. I think if we could have a shared network storage of 20TB+ raid 10 or so for all our servers for keeping the backups and another department will copy them to tape from the network storage and delete files according to the retention period would be good, if this box would be a build in operating system (even unix a complete file storage system) that would be good. What do you guys think, does this make sense to you, is there any manufacturer that sells a storage product like that which that work in a clustered environment? Thank you

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• Corrupt mysql system tables

  - by psynnott

  I am having issues with the columns_priv table in the mysql system database. I cannot add new users currently. I have tried repairing it using mysqlcheck --auto-repair --all-databases --password but I get the following output: mysql.columns_priv Error : Incorrect file format 'columns_priv' error : Corrupt Is there any other way to repair this table, or how do I go about replacing it with a blank table? What would I lose by doing that? Thank you Edit (Additional Info) mysqld is currently using 100% cpu constantly. Looking at show processlist, I get: mysql> show processlist; +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ | 5 | debian-sys-maint | localhost | mysql | Query | 1589 | Opening tables | ALTER TABLE tables_priv MODIFY Column_priv set('Select','Insert','Update','References') COLL | | | 752 | root | localhost | NULL | Query | 0 | NULL | show processlist | +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec)

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• Copy & Paste Images Wiki functionality?

  - by Jakub

  I was discussing this with some coworkers, they would like a wiki, but are turned off by the need to constantly [browse] and [upload] files. They like the functionality of Lotus Notes that they can copy & paste screenshots (or crops etc) directly into Notes databases / libraries. But they are not fans of Lotus notes behond that (performance, etc,) Anyone work with a free (open source hopefully) wiki of documenting application that just allows copy & paste of text & image content? Would be great to have one internally installed that we could use for documentation without constantly uploading/attaching files. Not sure if I am asking for functionality that is not available in a browser.

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• How can I VPN into a domain and act as if it is local?

  - by Duall

  I've looked and looked and the internet seems to have finally failed me, there's no information on my specific issue. I have two locations, and one server (sbs 2008); I need them to act like one physical LAN. I know it's possible, I just know how to set it up, or anything about VPNs, etc. So, just to clarify a bit more: 1 Small Business Server 2008 ~30 Computers with varying systems from Windows XP to 7 2 Physical Locations I use redirected folders, but since that would consume a lot of bandwith over VPN, I have a machine over there that can be the workhorse for storage. Users need to access e-mail and shared databases from this server (or possibly some form of DFS with aforementioned workhorse) from the other building. Is there a nice tutorial (or I nice person that wants to write it) online that can explain how to set up computers from an external network to act like they were in the LAN?

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• Shared volume for data (multiple MDF) and another shared volume for logs (multiple LDF)

  - by hagensoft

  I have 3 instances of SQL Server 2008, each on different machines with multiple databases on each instance. I have 2 separate LUNS on my SAN for MDF and LDF files. The NDX and TempDB files run on the local drive on each machine. Is it O.K. for the 3 instances to share a same volume for the data files and another volume for the log files? I don't have thin provisioning on the SAN so I would like to not constaint disk space creating multiple volumes because I was adviced that I should create a volume (drive letter) for each instance, if not for each database. I am aware that I should split my logs and data files at least. No instance would share the actual database files, just the space on drive. Any help is appretiated.

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• How to completely remove MySQL from Windows?

  - by Nathan Long

  (I realize there are similarly-titled questions, but this one is really 'how do I reset the password', and this one doesn't specify an OS and has only gotten Linux-oriented answers.) On Windows XP, I just uninstalled MySQL and deleted the folder that it was installed in. I then rebooted and reinstalled MySQL. When it comes back up, it still has the databases it had before the uninstall. Where did it keep that database info? How do I completely remove MySQL and start over, as if I'd never installed it?

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• Equivalent of phpMyAdmin for MSSQL?

  - by Tedd Hansen

  Is there any webinterface for administrating MSSQL similar to phpMyAdmin (for MySQL)? I want a self-service setup where developers can create a database through webinterface and upload/download backups of the database without local access. I've considered phpMSAdmin, but it hasn't had a release since 2006 so I'm not sure its worth the effort of setting it up. If there is something else (free or not-so-free) that would be great. My question is similar to this one posted 2 years ago, but no good webinterface was found back then. SQL Web Data Administrator seems interesting, but it lacks a few features - most notably creating new databases (also, not updated since 2007).

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• Why do servers go down after a lot of traffic?

  - by mohabitar

  I'm working on an iOS app that makes extensive use of databases, where users will be able to sync their data to a server. However, I'm terrified of the event that if too many users start using the app, the servers will no longer be able to handle it. I'm not a server guy at all and am not too familiar with how that works, but my question is, why do servers get overloaded and how can that be prevented? Does it have to do with who my server host is? Or is it about the efficiency of my code? If my host is a reliable server, such as Amazon AWS, am I still at risk for server problems? Bottom line is, does it have to do with the way I implement my code, or does it have to do with who my host is?

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• apache - subdomains are slower?

  - by matthewsteiner

  Using apache benchmark, I ran the exact same php application at my root domain and a subdomain. Even with multiple tests and high request numbers, the requests per second perform extremely differently. I mean something like this: example.com - 1200 requests per second bench.example.com - 50 requests per second What could be affecting this? These aren't using databases or anything, just mainly getting a simple page displaying. But it's the same app for both of them, and I'm wondering why they perform so differently. Ideas?

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• alternatives to roboform

  - by ldigas

  Yes, I know there is already a few similar questions. Is there an alternative to RoboForm (which for some reason makes my FF very slow, because of some other extensions) which has the same way of working. What I mean, you click on ... and it opens a new tab with the page in question, and logs on to it (so no databases, and such ...). One other advantage would be if it kept passwords locally. Basically, I'm looking for RoboForm other than RoboForm. Anyone knows of any ?

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• Best way to troubleshoot apache not starting?

  - by lowgain

  We have recently gotten a backup server to mirror all our data onto in case the primary server goes down. I've gotten all the sites data updated through rsync, and all the apache config and databases updated. Both machines are on Ubuntu 9 (9.04 on the primary, 9.10 on the backup). So everything seems synced up for the most part at this point (still need to figure out user syncing), and I try to start Apache. I get * Starting web server apache2 [fail] Nothing else indicating what the problem could be. I know I don't have enough info to expect a solution from you guys, so I'd just like to know where I can go from here to further investigate this issue. Would there be any error logs for this? Thanks!

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• SQL2005 reporting server: intense security activity

  - by David Wimbush

  On my reporting server the Security log shows large numbers of Logon/Logoff events, often 10 or more, when you run pretty much any report in the Report Manager. Is this normal or is it a classic sign of having the wrong setup? Some system details: Windows Server 2003 R2 SP2, virtual server running under VMWare). SQL Server 2005 SP3 Standard Edition, running databases, Report Manager, and Ananlysis Services cubes. No other major services on the machine (i.e. it's not a domain controller, Exchange server or anything like that). Any ideas, please, guys?

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• Exchange - get age range of items using Powershell

  - by marcwenger

  We are going to be implementing personal archives for Exchange in our organization. For us to get a good grasp on how much space is needed, we need to get an idea of the age of items that we currently have. Is it possible to have a powershell script that tells me the total size and number of items given certain date ranges of all mailboxes in all databases? What I'd like to have is the 1) number of items, 2) total size of times (GB) - all grouped by date ranges (Less than 15 days, 15-30 days, 30-60 days, 60-90 days, more than 90). Another possibility would be to have it also grouped by mailbox database

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• Can you link to a good MySQL dumper PHP script?

  - by Ivan

  I need to migrate a website to another host. I have only FTP server access and MySQL name+pass (the MySQL server's IP I was provided is 127.0.0.1, and there's neither PhpMyAdmin nor SSHell to use). A web app run there can access the DB using credentials I know and localhost server. So I'd need a PHP script, that will correctly dump all the available databases of the MySQL server so that they can be imported on the new server. Can you recommend a good one?

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• How do I check to see if an apt lock file is locked?

  - by gondoi

  I am writing a script to do some apt commands, but I am running into potential issues of the apt/dpkg databases being locked so my script bails. I want to check the lock files (i.e. /var/lib/dpkg/lock) before doing anything just like apt does when it runs it's command, but I can't figure out how apt is performing the lock. The lock file is always there, and apt-get is not doing a flock on the file. How else would it be checking to see if it is in use? From an strace I see that apt-get opens the file, but that is it. In my script, I can open the file while apt-get has it open as well.

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• ServerName no longer works as SQL Server 2008 Default instance name?

  - by TomK

  Folks, Somehow in struggling to install something (Sage MIP), I have unsettled my system's SQL Server 2008 instance names. If I fired up SSMS and connected to "MySystemName" (while logged into MySystemName), I used to immediately connect and could view my databases. Now if I connect to "(local)" or "." I connect just fine...but "MySystemName" gives me a timeout error. If I log in with "." and do "SELECT @@SERVERNAME" it comes back with "MySystemName" just fine. I've double checked that my network name is in the Security\Logins list, and it is, as a dbadmin. Any suggestions? I thought that having SQL Server 2005 Express might be a problem (the "battle of the default instances"), so I uninstalled that. No better.

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• Using my System as the server- need advice

  - by Ashwin

  We are deploying my web application in my system in jboss. And I am planning to use my system as the server as well. There are no html pages or jsp pages deployed. The client requests for resources and the server provides the resources in the form of objects. We are also using databases(Postgresql-15 tables) as the database server(this will also reside in my machine). My system configuration is Windows Vista, 2.3 GHZ, 4GB Ram, 32 bit. There can be many requests coming in at the same time. So is this configuration enough? Should we go with a different Operating System like Windows Server? I have never used Windows Server OS. How will it be different from other windows operating systems? Or if you feel please some other OS will be good in this situation, please suggest.

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• Nginx proxy to Apache - resolve HTTP ORIGIN

  - by Fratyr

  I have a server setup with nginx serving static content and proxy all PHP/dynamic requests to apache on 127.0.0.1 I'm building an API for my databases, and I need to allow clients by their origin (domain name), rather than just IP. Based on CORS rules. So when I send an HTTP header header("Access-Control-Allow-Origin: www.client-requesting.myapi.com"); from my API server, I have to tell it which origin I allow, otherwise client side requests won't work to my API due to same-origin policy. The question is how can I know which domain name (if any) called my API? What should be the nginx and apache configuration to pass the origin parameter? I tried to google, and all I found is some possible solution with mod_rpaf, but I wanted to be sure. Thanks!

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• SQL server availability issue: large query stops other connections from connecting

  - by Carlos

  I've got a high-spec (multicore, RAID) server running MS SQL 2008, with several databases on it. I have a low throughput process that periodically needs a small amount of information from one of the DBs, and the code seems to work fine. However, sometimes when one of my colleagues does a huge query against one of the other DBs, I see full CPU usage on the machine, and connections from my app time out. Why does this happen? I would have thought the many cores and harddisks would somehow (together with cleverly written DB server) be able to keep at least some of the resources free for other apps? I'm pretty sure he doesn't use multiple connections for his query. What can I do to prevent this?

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