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

HTTP Authentication error in PHP

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

How do I backup a MariaDB - MySQL Database?

In the control panel, within Backup section, under Download a SQL Database Backup will be your...

When trying to connect to MariaDB or MySQL you receive error 2003 Cannot connect to MySQL on x.x.x.x on port 3306 (10060)

Please ensure you have added the remote IP to the allow list in your hosting control panel...

How do I add a user to a MariaDB & MySQL database?

In the MariaDB / MySQL Database section of your hosting control panel, after creating a database...

How can I view/modify data in my MariaDB - MySQL database?

Only make changes if you know exactly what you are doing. Often incorrect changes can have an...