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14.1.1 `MyISAM' Startup Options
-------------------------------
The following options to `mysqld' can be used to change the behavior of
`MyISAM' tables:
`--myisam-recover=MODE'
Set the mode for automatic recovery of crashed `MyISAM' tables.
`--delay-key-write=ALL'
Don't flush key buffers between writes for any `MyISAM' table.
* If you do this, you should not use `MyISAM' tables from
another program (such as from another MySQL server or with
`myisamchk') when the table is in use. Doing so will lead to index
corruption.
Using `--external-locking' will not help for tables that use
`--delay-key-write'.
Server options.
The following system variables affect the behavior of `MyISAM' tables:
`bulk_insert_buffer_size'
The size of the tree cache used in bulk insert optimization.
`myisam_max_extra_sort_file_size'
Used to help MySQL to decide when to use the slow but safe key
cache index creation method. * This parameter is given in
megabytes before MySQL 4.0.3, and in bytes as of 4.0.3.
`myisam_max_sort_file_size'
Don't use the fast sort index method to create an index if the
temporary file would become larger than this. * This
parameter is given in megabytes before MySQL 4.0.3, and in bytes
as of 4.0.3.
`myisam_sort_buffer_size'
Set the size of the buffer used when recovering tables.
Server system variables.
Automatic recovery is activated if you start `mysqld' with the
`--myisam-recover' option. In this case, when the server opens a
`MyISAM' table, it checks whether the table is marked as crashed or
whether the open count variable for the table is not 0 and you are
running the server with `--skip-external-locking'. If either of these
conditions is true, the following happens:
* The table is checked for errors.
* If the server finds an error, it tries to do a fast table repair
(with sorting and without re-creating the data file).
* If the repair fails because of an error in the data file (for
example, a duplicate-key error), the server tries again, this time
re-creating the data file.
* If the repair still fails, the server tries once more with the old
repair option method (write row by row without sorting). This
method should be able to repair any type of error and has low disk
space requirements.
If the recovery wouldn't be able to recover all rows from a previous
completed statement and you didn't specify `FORCE' in the value of the
`--myisam-recover' option, automatic repair aborts with an error
message in the error log:
Error: Couldn't repair table: test.g00pages
If you specify `FORCE', a warning like this is written instead:
Warning: Found 344 of 354 rows when repairing ./test/g00pages
Note that if the automatic recovery value includes `BACKUP', the
recovery process creates files with names of the form
`TBL_NAME-DATETIME.BAK'. You should have a `cron' script that
automatically moves these files from the database directories to backup
media.
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