MySQL Forums
Forum List  »  Optimizer & Parser

Re: Optimizer for innodb does not reduce "data_free"
Posted by: Rick James
Date: December 08, 2012 01:33PM

* 4-7M is normal for "Free" on not-small InnoDB table. It won't go away.
* 4-7M does not mean "fragmentation"; it means space pre-allocated.
* Do not OPTIMIZE unless Free is a bigger percentage of the total.
* OPTIMIZE is rarely worth doing for InnoDB. The Data is always ordered by the PRIMARY KEY (unlike MyISAM); nothing will be 'rearranged' during OPTIMIZE.
* There is no good metric for degree of fragmentation. When Free is > 7M, then there is some fragmentation; however, there could be more space recoverable from Data, and maybe Index.

Options: ReplyQuote


Subject
Views
Written By
Posted
Re: Optimizer for innodb does not reduce "data_free"
1693
December 08, 2012 01:33PM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.