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• mysql single database relocation

  - by asdmin

  I would like to know if it's possible to operate different databases on different filesystem locations. Background: we are a hosting service, which hosts mysql, web, and smtp to it's customer, but all our services (sql, smtp, http) are located in a different place. We are going to assign a single logical volume to a customer, which will accommodate the customer's mailing, weppages and (hopefully) sql database. Web pages and mailing are already covered, but I am not able to find a configuration setting which would enable me to specify the location of a database (the directory where mysql stores the DB). Let me please highlight, the target here is to relocate different databases to different locations in the filesystem, not moving them from a single place to an another (single) place. Also please do not bother answering with soft and hard symbolic links. ;) Thanks

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• What is the best way to change the replication scheme of 2 currently replicated slaves?

  - by mmattax

  I have MySQL replication set up in production as follows: DB1 - DB2 DB1 - BAK Where DB2 and BAK are slaves to DB1. All 3 servers are in sync (0 seconds behind the master) and have 30+ GB of data. I'd like to put the servers in a new master-slave configuration as follows: DB1 - DB2 - BAK What is the best way to change the master host on BAK? Is there a way to avoid having to stop the slave thread on DB2 and getting a mysqldump for BAK (a 5-6 hour processes) ?

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• Optimal way to make MySQL backups for fairly large databases (MyISAM / InnoDB)

  - by WinkyWolly

  Currently we have one beefy MySQL database that runs a couple of high traffic Django based websites as well as some e-commerce websites of decent size. As a result we have a fair amount of large databases using both InnoDB and MyISAM tables. Unfortunately we've recently hit a wall due to the amount of traffic so I've setup another master server to help alleviate reads / backups. Now at the moment I simply use mysqldump with a few arguments and it's proven to be fine.. until now. Obviously mysqldump is a slow quick method however I believe we've outgrown its use. I now need a good alternative and have been looking into utilizing Maatkits mk-parallel-dump utility or an LVM snapshot solution. Succinct short version: I have a fairly large MySQL databases I need to backup Current method using mysqldump is inefficient and slow (causing issues) Looking into something such as mk-parallel-dump or LVM snapshots Any recommendations or ideas would be appreciated - since I have to re-do how we're doing things I rather have it done properly / most efficient :).

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• MySql calculate number of connections needed

  - by Udi I

  I am trying to figure my needs regarding web service hosting. After trying Azure I have realized that the default MySql they provide (through a third party) limits the account to 4 connections. You can then upgrade the account to 15, 30 or 40 connections (which is quite expensive). Their 15 connections plan is descirbed as: "Excellent choice for light test and staging apps that need a reliable MySQL database". I have 2 questions: if my application is a web service which needs to preform ~120k Queries a day (Normal/BELL distribution) and each query is ~150ms(duration)/~400ms(fetch), how many connection do I need? If instead of using cloud computing, I will choose a VPS, how many connections will I be able to handle on a 1GB 2 cores VPS? Thank you!

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• Mysql Servers for Attendance System

  - by foo

  I'm building an attendance system. There are about 20 places where people will check in and check out using Mifare 1K Card. It will use MySQL as the database. The system will display something like "#ID IN: 800AM" when the first time the user checks in and "#ID OUT: 400PM" when the user checks out. For this to work, all the databases need to be synchronized with each other all the times. For an example, if user A went to location #1 to check in but by the time he wants to return home, the server at location #1 went down, he needs to go to location #2 or the nearest server to check out. The server at location #2 should display '#ID OUT: 400PM" and not "#ID IN: 400PM" since he's already checked in. So, what should I use to ensure this idea will work? My main concern is with the network (other department manages it) which is very unpredictable. It just love to go down anytime it wants to. Update LOL, didn't realize my question is not clear, just noticed it when you guys pointed it out, sorry about that. My real question is, how can I configure my MySQL to be synchronized with each other (20 servers)? MySQL cluster ? (tried reading about it, but I'm not sure if it's the right thing to do) My current setup (first phase): Local database for each server OS: Slackware A main server that keeps track which staff is at which server A web based front end for the user to see their history (which connects to the server based on their records) Main Pros No worries about network problems since it is a local database Main Cons A user can only check in and out at the same server. Databases/Servers are not connected with each others. Have to add the user to each server if the users want to check in at different locations. Which means, if he wants to go to location A, he must be checked out from location A first and then check in at location B. The server at location B didn't know that the user has checked in before at A. By the way, I've already centralized my NTP to a local server. About the network, let's just say, I don't have the authority to make changes so that the network will be better. The network won't effect all 20 servers at once, usually, just a few of them for several times a week. If there are anything else you would like me to answer, please just ask.

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• MySQL maintenance - how to clear the buffer?

  - by Dougal

  We have a server running our web app (PHP / MySQL) which is SLOW. My predecessor says that: "We use to do database maintenance, which use to clear the buffer, cached and unwanted variables." And I wonder what on earth he means with that statement? Does he mean a simple optimize of the tables? Or the query cache? I understand MySQL but don't really know what he is describing. I would appreciate any pointers. Thanks.

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• Iptables Allow MYSQL server incoming requests

  - by thompatry

  I am trying to get my new MediaWiki server to allow connections to our MySql Server and right now I cannot get my iptables firewall set up right for this. The rule I am applying is the following iptables -A INPUT -p tcp -d 129.130.155.39 --dport 3306 -j ACCEPT # MySQL But my iptables log is still show that the connections can not be established and is being blocked/denied. Nov 21 09:48:39 hds-it kernel: Firewall Deny: [OUTPUT] IN= OUT=eth1 SRC=129.130.155.210 DST=129.130.155.39 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=29232 DF PROTO=TCP SPT=58862 DPT=3306 SEQ=914529531 ACK=0 WINDOW=14600 RES=0x00 SYN URGP=0 OPT (020405B40402080A03BCF2BC0000000001030307) When I turn off iptables, everything works as it should including editing the wiki database. What am I doing wrong with my rule.

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• 3 Root accounts in MySQl database

  - by hairbymaurice

  Hello, I have managed to get mySQL running under Ubuntu 8.10, I am now diligently trying to secure the database and am adding passwords for the root users. My question: I have a root user under the host "kickseed" with no password set I have no idea what kickseed is as the database is installed under localhost, on searching around i have discovered that this is something to do with the ubuntu OS itself. Is it safe to delete this user account from MySQL or is it used for something by the OS? If i need to keep it should i /can i protect it with a password? Also i have another root account under the host IP 127.0.0.1 again can i delete this? My absolute preference would be to have only one account with root access but i do not want to delete these accounts if they are necessary. Thanks for tolerating a newbie Regards Hairby

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• How do I troubleshoot mysql and php?

  - by Joshua Moore

  PHP works, mysql works, but when I call mysql_connect, nothing happens. What can I do?

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• problem with mysql and php

  - by Joshua Moore

  PHP works, mysql works, but when I call mysql_connect, nothing happens. What can I do?

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• MySQL Unions/Subselects not utilizing keys from associated tables

  - by Brett

  I've noticed by doing EXPLAINs that when a MySQL union between two tables is used, mysql creates a temporary table, but the temp table does not use keys, so queries are slowed considerably. Here is an example: SELECT * FROM ( SELECT `part_number`, `part_manufacturer_clean`, `part_number_clean`, `part_heci`, `part_manufacturer`, `part_description` FROM `new_products` AS `a` UNION SELECT `part` as `part_number`, `manulower` as `part_manufacturer_clean`, `partdeluxe` as `part_number_clean`, `heci` as `part_heci`, `manu` as `part_manufacturer`, `description` as `part_description` FROM `warehouse` AS `b` ) AS `c` WHERE `part_manufacturer_clean` = 'adc' EXPLAIN yields this: id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL (NULL) (NULL) (NULL) (NULL) 17206 Using where 2 DERIVED a ALL (NULL) (NULL) (NULL) (NULL) 17743 3 UNION b ALL (NULL) (NULL) (NULL) (NULL) 5757 (NULL) UNION RESULT <union2,3> ALL (NULL) (NULL) (NULL) (NULL) (NULL) In this case, part_manufacturer_clean and manulower are keys in both tables. When I don't use the subselects and union, and just use one table, everything works fine. I'm not sure if the issue is with the union or with the subselects. Is there any way to union two tables and still use keys/indexes for performance?

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• Tuning MySQL to consume less memory

  - by Alex

  I have a VM which has 2GB Ram, (full specs) And I am setting up a site which has one table in particular with over a million records. There's little or no usage of this particular database (perhaps once or twice a day) but simply running mysql grinds the whole server to a halt. I've looked through the top results but nothing is really denting the CPU however the memory seems to be the issue. The site isnt even live of taking requests yet. the memory situation looks like this: # free -m total used free shared buffers cached Mem: 2006 1880 126 0 3 53 -/+ buffers/cache: 1823 183 Swap: 2047 345 1702 Are there any good pointers to tune mysql to stop hogging the system memory? Thanks very much EDIT: (requested by 8bit): http://tny.cz/b41a0b12

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• How to Architect a system on AWS for scaling (with a MySQL back-end)

  - by Edan Maor

  I'm trying to understand how to architect an Amazon Web Services application. As I understand it, the whole point of using something like AWS is to make the eventual scaling easier, so I'm trying to understand how to do that. I have an instance, running off of EBS (EBS-based instance, not a regular instance). My application (a Django app) uses MySQL as a back-end. So the question is, where am I supposed to install the MySQL? Do I install it on the same instance? In which case, as far as I can tell, I can't simply create more server instances from that image. Or am I supposed to simply spin up another server as a DB server, and run off of that? Thanks for any help!

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• Running MySQL as SYSTEM Service in Windows XP

  - by enesviem

  I have this strange problem where I create a database in MySQL and I need to restart mysqld but I can't seem to do it with info the MySQL docs. Then, I kill it from the Task Manager and I can't restart it. When I look at the process, it is run by the SYSTEM, rather than me. When I run mysqld it starts the process by me, not the SYSTEM. Am I shutting it down incorrectly? IS there a way to start this daemon as the SYSTEM?

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• Ubuntu Server Edition (Jaunty) x64 Segmentation faults in PHP mysql package

  - by Deeksy

  I've been running Jaunty with Apache2, PHP & MySQL running drupal websites as well as python 2.6 and trac on the same server. I'm getting quite a few segmentation faults and suhosin warnings on my drupal websites which don't seem to be related to the amount of RAM the server has (3GB) as the trac site is running happily without issues. The issue seems to be related to PHP accessing mysql and I'm getting suhosin warnings. Has anyone else seen this problem? Any ideas on how to fix it? Funnily enough, it's not a consistent error, as restarts tend to fix the issue temporarily.

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• MySQL cluster: 20Tb x 3K tables

  - by ethrbunny

  Over the next 2-3 years we will be scaling up data collection for a project. As a result the amount of data will grow 10-fold. Our current MySQL installation can keep up with the 2Tb of data but for larger queries there is a fair amount of IOWait. Im investigating a migration to a clustered solution to spread out the IO but am wondering about NDB and what happens to data that doesn't get accessed very often. The impression I get from reading about MySQL cluster is that it relies on memory tables for most of the data. What happens with tables that don't get accessed very often (or at all)? And how does backup work? Can I use MYSQLDUMP or is there a better solution?

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• Mysql Encryption and Key managment

  - by microchasm

  I am developing a local intranet system in PHP/MySQL to manage our client data. It seems that the best practice would be to encrypt the sensitive data on the MYSQL server as it is being entered. I am not clear, though, on what would be the best way to do this while still having the data readily accessible. It seems like a tough question to answer: where is the key(s) stored? How to best protect the key? If the key is stored on each users' machine, how to protect it if the machine is exploited? If the key is exploited, how to change the key? If the key is to be stored in the db, how to protect it there? How would users access it? If anyone could point me in the right direction, or give some tips I'd be very grateful. Thanks.

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• MySQL returning slow queries with result sets bigger than 30 rows

  - by josephs8

  When ever I run a query that exceeds 30 queries the time for the query to run goes from less than a second to over 10 seconds to get data. Example I run a query to return 29 rows, it takes .1 seconds, I run a query to return 31 rows it takes 11.2 seconds. I am running mySQL on Windows 2008 Server Dual Core 2.6Ghz with 3GB of Memory. The machine doesn't run anything else. It does have a instance of MSSQL running on the server but that does not get used at all. This only happens via PHP right now, If I manually run the query on the server it returns it in less than a second. The queries are not complicated either I have included one below: SELECT Name, Value FROM `bis_co`.`departments` LIMIT 31 What would be causing this issue and how can I correct this? Am I missing a configuration setting in MySQL or something. Thanks

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• Connect to MySQL trough command line without need root password

  - by ReynierPM

  I'm building a Bash script for some tasks. One of those tasks is create a MySQL DB from within the same bash script. What I'm doing right now is creating two vars: one for store user name and the other for store password. This is the relevant part of my script: MYSQL_USER=root MYSQL_PASS=mypass_goes_here touch /tmp/$PROY.sql && echo "CREATE DATABASE $DB_NAME;" > /tmp/script.sql mysql --user=$MYSQL_USER --password="$MYSQL_PASS" < /tmp/script.sql rm -rf /tmp/script.sql But always get a error saying access denied for user root with NO PASSWORD, what I'm doing wrong? I need to do the same for PostgreSQL, any help? Regards and thanks in advance

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• Some strange things in the db table of mysql database

  - by 0al0

  I noticed some weird things in the db table of mysql database in a client's server, after having the Mysql service stopping for no reason what are the test, and test_% entries? Why are there two entries for the database AQUA? Why is there a entry with a blank name? Should I worry about any of those? What should I do for each specific case? Is it safe to just delete the ones that should not be there, after backing up?

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• Other computer can't connect to MySQL Database

  - by user23950

  I have a VB .NET program the uses a MySQL database. It works when the computer that has WAMP installed is the one running the program. The same program now displays an Unhandled Exception error when the computer it's running on does not have WAMP installed (and running). The only thing that is installed is the MySQL connecter net. How can I make this work? I have already tried opening port 20 by configuring the firewall. I did this for both TCP and UDP.

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• mysql server, open 'dead' connections

  - by Jeff

  my basic question is what kind of impact does this have on the server.. lets say for example, there is an older program in my company that opens connections to a mysql database server at a high rate (everything they do with the application basically opens a server connections) however, this application was not designed in the way to dispose of the connections after they where created.. alot of the time the connections remain open but are never used again, open 'dead' connections i guess you could say. they just remain connected until the server times them out, or until an admin goes in and removes the sleeping connections manually. im guessing this could be responsible for sometimes not able to connect errors etc. that we receive from other systems that try to access the mysql database? (connections limit reached) could this slow down the server as well? curious what all this could exactly cause. thanks!

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• mysql is not using multiple cpus

  - by mhost

  Our MySQL server has been using a lot of CPU lately (it's reached 100% several times and stays there for a while) and I noticed that it the CPU load is all on one core of one cpu. I was hoping to spread that out to all 4 on my server. I have been tweaking the MySQL settings to use more ram and less cpu, but it still occasionally reaches very high CPU usage. It seems like everything about the topic refers to thread_concurrency (which I've read is a solaris only setting). What can I do in Linux? Thanks.

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• Backup all plesk MySQL Databases to individual files

  - by Michael

  Hy, Because I'm new to shell scripting I need a hand. I currently backup all mydatabases to a single file, thing that makes the restore preaty hard. The second problem that my MySQL password dosen't work because of a Plesk bug and i get the password from "/etc/psa/.psa.shadow". Here is the code that I use to backup all my databases to a single file. mysqldump -uadmin -p`cat /etc/psa/.psa.shadow` --all-databases | bzip2 -c > /root/21.10.2013.sql.bz2 I found some scripts on the web that backup each database to individual files but I don't know how to make them work for my situation. Here is a example script: for db in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $db | gzip > "/backups/mysqldump-$(hostname)-$db-$(date +%Y-%m-%d-%H.%M.%S).gz"; done Can someone help me make the script above work for my situation? Requirements: Backup each database to individual file using plesk password location.

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• MySQL Replication fix after server shutdown/start

  - by Jagbir

  Server1 is Master Server2 is Slave Both are in our AWS testing env and we stop them once done with our work. When start again, Master rotates/creates new binary log file but slave keep looking for same/existing one and replication stops. Right now, I'm manually repairing it by (slave): stop slave; CHANGE MASTER TO MASTER_HOST='xx', MASTER_USER='xxx', MASTER_PASSWORD='xxx' , MASTER_LOG_FILE='new-mysql-bin.00000x',MASTER_LOG_POS=107; start slave; show slave status\G and slave becomes good again.Mysql is 5.5.x on Ubuntu 12.04. Will appreciate any help in automating it.

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