To coalesce fragmented rows and eliminate wasted space that results from deleting or updating rows, run myisamchk in recovery mode:
shell> myisamchk -r tbl_name
You can optimize a table in the same way by using the
OPTIMIZE TABLE
SQL statement.
OPTIMIZE TABLE
does a table
repair and a key analysis, and also sorts the index tree so that
key lookups are faster. There is also no possibility of unwanted
interaction between a utility and the server, because the server
does all the work when you use OPTIMIZE
TABLE
. See Section 12.5.2.5, “OPTIMIZE TABLE
Syntax”.
myisamchk has a number of other options that you can use to improve the performance of a table:
--analyze
,
-a
--sort-index
,
-S
--sort-records=
,
index_num
-R
index_num
For a full description of all available options, see Section 4.6.3, “myisamchk — MyISAM Table-Maintenance Utility”.
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