Reverse Index columns
Posted by: jun kazawa
Date: February 07, 2009 04:38AM

We have a huge table that is accessed frequently read (95% at least once every 5 seconds) and write (5%).
The table is the only MySQL table (others are InnoDB) - reason being that this specific table contains a FullText index (that is not the object of the current post).

We have an old index I on it on columns (int a, datetime b, int c).
However the new design would prefer to get the index columns as (a,c,b).

What we want is the smallest disturbance users side.
And I'm afraid a Create-New-Index I2 (then Drop-old-Index I) would lock the table for quite long.

Is there a workaround - a command/option that would use a trick either
- to create the index "silently" without locking the table?
- or better, to keep (a) and reverse (b,c) - if that would be faster?

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Written By
Reverse Index columns
February 07, 2009 04:38AM
February 07, 2009 11:53PM
February 08, 2009 06:01AM
February 08, 2009 12:04PM

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