Clean - Shrink ibdata1

To shrink ibdata1 once and for all you must do the following:

MySQLDump all databases into a SQL text file (call it SQLData.sql)
Example, change directory to the /home directory which may be a partition with more space.
mysqldump -uroot -p --all-databases --extended-insert --add-drop-database --disable-keys --flush-privileges --quick --routines --triggers > all-databases.sql

Drop all databases (except mysql schema) via PHPMyAdmin or shell.

service mysql stop

Add the following lines to /etc/my.cnf

[mysqld]
innodb_file_per_table
innodb_flush_method=O_DIRECT
innodb_log_file_size=1G
innodb_buffer_pool_size=4G

rm -f /var/lib/mysql/ibdata1 /var/lib/mysql/ib_logfile

At this point, there should only be the mysql schema in /var/lib/mysql

service mysql start

This will recreate ibdata1 at 10MB, ib_logfile0 and ib_logfile1 at 1G each

Reload SQLData.sql into mysql

ibdata1 will grow but only contain table metadata

Each InnoDB table will exist outside of ibdata1

Suppose you have an InnoDB table named mydb.mytable. If you go into /var/lib/mysql/mydb, you will see two files representing the table

mytable.frm (Storage Engine Header)
mytable.ibd (Home of Table Data and Table Indexes for mydb.mytable)

ibdata1 will never contain InnoDB data and Indexes anymore.

With the innodb_file_per_table option in /etc/my.cnf, you can run OPTIMIZE TABLE mydb.mytable; and the file /var/lib/mysql/mydb/mytable.ibd will actually shrink.


Share this page:


Was this article useful? Have any suggestions or improvements to the information?

Also Read

What is the path to PHP5?

We are currently running the latest stable version of PHP5. /usr/bin/php

Warning: Unknown(): open_basedir restriction in effect.

Basedir restriction is set for security. This most often occurs when you are calling an app...

How can I parse .html as .php?

Create an .htaccess file and upload it to the root of your public_html directory. Include the...

PHP information

To view your current version of PHP you will create a php file, for example info.php, and place...

HTTP Authentication error in PHP

Issues with HTTP Authentication error in PHP. Variables $_SERVER['PHP_AUTH_USER'] and...