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Optimizer for innodb does not reduce "data_free"
Posted by: Sebastian Schött
Date: December 06, 2012 03:39AM

-- MySQL Version 9.10 Distrib 5.5.28
-- Fresh installation on SLES 11 SP 2 (64bit) rpm
-- innodb_file_per_table

table status of innodb tables shows "data_free=4194304" for several tables of a freshly importet database on a freshly installed database-server! (which means fragmentation?!)

optimize table [tablename] wont change anything - tables are being recreated but data_free value is the same as before.

Since i've set "innodb_file_per_table", i thought data would be stored in the specific tables directory instead of the shared datafile?!

Why can have multiple tables have exactly the same value in data_free?
Why is optimize table not working in that case?

Any clarification would be much appreciated.

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Optimizer for innodb does not reduce "data_free"
December 06, 2012 03:39AM

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