If you have multiple database running on your system, you can optimize all the tables located under all the database on your system using the following command. After the optimization, using the following query, check the total-size and unused-space-size for the three tables that we optimized in this example.
The file size for these tables are now lot less when compared to the original size. We have now reclaimed lot of unused space at the filsystem level for these tables. However, in production, a zero-downtime deployment method should be used to avoid the outage. When doing this type of optimization in a replication ring, I will typically turn off binary logging of these statements before doing the alter or optimize table. On which version of mysql your command is use, my version is 5.
Agreed that it will be a big deal if doing this on production machine and ppl trying to reduce downtime. It gives a rough ideal of duration required and can be added into planned production maintenance downtime such as patching etc. Defragmentation will not only recover space, it will also help the queries run faster. Using partitions is a better way if you want to avoid frequent downtime for optimization. Save my name, email, and website in this browser for the next time I comment.
Since MariaDB 5. When rows are added or deleted to an InnoDB fulltext index , the index is not immediately re-organized, as this can be an expensive operation. Change statistics are stored in a separate location. This is intended to be a temporary setting, and should be reset to 0 once the fulltext index has been re-organized. MariaDB If you are trying to reduce the size of ibdata1 for InnoDB, dropping tables simply leaves big gaps in ibdata1.
This will leave the space previously occupied to add further to the fragmentation madness. In this scenario, the temp table would exist as InnoDB, and it would materialize in ibdata1. Thus, there would be nothing to visually monitor. You will have to carry out the InnoDB Cleanup to recreate ibdata1 in such a way that data and indexes never, ever again reside in ibdata1. MySQL generates a. TMD file; you can watch the size of the file growing; it should reach more or less the size of your existing MYD when it is done.
In my case, the progress is MB out of MB roughly. Percona Toolkit's pt-online-schema-change does this for you. Change mydb. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
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