MySQL
MYSQL
IBData files Large
I had an issue with the ibdata1 file in /var/lib/mysql/ growing too large. It includes some database information and in my 10GB root partition, was taking up 8GB.
The solutions I found were:
- backup zm database, delete zm db, delete ibdata file, then restore database How to Shrink/Purge Ibdata1 file
OR
- Move the ibdata file to another partition
OR
- Change DB type to InnoDB (requires backup, deletion, and restoring db, per first solution)
Changing the database type to have an innodb file per each table as mentioned in the "how to shrink purge ibdata1 file in mysql" link will keep less data used in the ibdata1 file in the future, allowing the former to be deleted when not needed. On the other hand the ibdata file by default, will not shrink, ever. This may not be an issue in MariaDB.
Looking for the least invasive procedure, I went with moving /var/lib/mysql, and adding the optional my.cnf parameter. This required the following tricks (may only apply to Ubuntu 14.04).
There are a number of guides on moving Mysql, yet many of them omit adding the alias to apparmors settings. This is required. Failing to do so will result in "Job failed to start" when mysql is run with #service mysql start.
A guide that covers all the steps required to move mysql on Ubuntu Trusty without omitting anything is here: Ask Ubuntu: Moving Mysql datadir Note that within my mysql installation there was no socket file in /var/lib or in my.cnf.
Backup/Restore Mysql DB
After moving the Data directory, I ended up backing up the zm db and restoring it anyways, in order to get the ibdata files to split correctly. This is not hard to do. The only DB you need to mysqldump from a stock ZM installation is the ZM db. And it's also the only DB you need restore.
For a full walkthrough on converting a MyISAM DB to InnoDB (also covers backing up ZM DB) see Enable and convert MySQL to innodb file per table for Zoneminder.
