why does InnoDB keep on growing without for every update?

Posted by Akash Kava on Stack Overflow See other posts from Stack Overflow or by Akash Kava
Published on 2010-12-28T13:10:02Z Indexed on 2010/12/28 13:53 UTC
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mysql

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update

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innodb

I have a table which consists of heavy blobs, and I wanted to conduct some tests on it.

I know deleted space is not reclaimed by innodb, so I decided to reuse existing records by updating its own values instead of createing new records.

But I noticed, whether I delete and insert a new entry, or I do UPDATE on existing ROW, InnoDB keeps on growing.

Assuming I have 100 Rows, each Storing 500KB of information, My InnoDB size is 10MB, now when I call UPDATE on all rows (no insert/ no delete), the innodb grows by ~8MB for every run I do. All I am doing is I am storing exactly 500KB of data in each row, with little modification, and size of blob is fixed.

What can I do to prevent this?

I know about optimize table, but I cant do it because on regular usage, the table is going to be 60-100GB big, and running optimize will just stall entire server.

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