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I've got two Tables and wonder why a table with less data can have a bigger keysize?
Posted by: Frank Niggemann
Date: February 12, 2010 08:24AM

I've got two Tables and wonder why a table with less data can have a bigger keysize?

Table A size 43,168,0 KiB:
Field A int(11) (PRIMARY AUTOINCREMENT)
FIELD B varchar(255) (UNIQUE)
FIELD C int(11) (INDEX)
FIELD D ENUM(12 FIELDS)
FIELD E DATE (INDEX)
FIELD F DATE (INDEX)
FIELD G DATE (INDEX)
FIELD H DATE (INDEX)

Table B size 52,896,0 KiB:
FIELD A varchar(255) (PRIMARY)
FIELD B int(11) (INDEX)
FIELD C ENUM(12 FIELDS)
FIELD D DATE (INDEX)
FIELD E DATE (INDEX)
FIELD F DATE (INDEX)
FIELD G DATE (INDEX)

The second table is a copy of the first table without the first column and with the primary key on the varchar-field.

So why is the second table with less data so much bigger? Shouldn't it be smaller?

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I've got two Tables and wonder why a table with less data can have a bigger keysize?
February 12, 2010 08:24AM


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