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Re: timestamp, datetime as default value as current_timestamp [PARTITION]
Posted by: Rick James
Date: August 31, 2012 09:52AM

> 3. the optimizer will use a fraction of the partitions (10 first up to now, that may be fixed in a later release) to estimate the index cardinalities.

See
http://dev.mysql.com/doc/refman/5.0/en/innodb-parameters.html#sysvar_innodb_use_legacy_cardinality_algorithm (5.0.82 / 5.1.35)
and
http://dev.mysql.com/doc/refman/5.1/en/innodb-parameters.html#sysvar_innodb_stats_sample_pages ( 5.1.38, not in 5.0 )
and
"persistent statistics" (5.6.2):
http://blogs.innodb.com/wp/2011/04/innodb-persistent-statistics-at-last/

All of those are kludges. If you use any of them to fix one problem, you are potentially making another problem worse.

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timestamp, datetime as default value as current_timestamp [PARTITION]
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Mannoj Kumar
August 29, 2012 01:21AM
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August 29, 2012 04:21AM
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Mannoj Kumar
August 29, 2012 04:32AM
Re: timestamp, datetime as default value as current_timestamp [PARTITION]
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Aftab Khan
August 29, 2012 09:16AM
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Rick James
August 30, 2012 10:35PM
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August 31, 2012 01:58AM
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Aftab Khan
August 31, 2012 02:04AM
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Rick James
August 31, 2012 09:52AM
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Mattias Jonsson
September 05, 2012 12:36AM
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Rick James
September 05, 2012 08:29AM
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Mannoj Kumar
September 03, 2012 11:26PM
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Rick James
September 04, 2012 08:05PM
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Mannoj Kumar
September 07, 2012 05:49AM
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Mattias Jonsson
August 31, 2012 06:00PM
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Aftab Khan
September 03, 2012 03:19AM


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