SpirirHost Support Centre: MySQL Reference Manual p.232

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Table of Contents
1. General Information
2. MySQL Installation
3. Tutorial Introduction
4. Database Administration
5. MySQL Optimisation
6. MySQL Language Reference
7. MySQL Table Types
8. MySQL APIs
9. Extending MySQL

232 MySQL Technical Reference for Version 4.0.3 other hand, OPTIMIZE TABLE is easier to use and you don't have to worry about ushing tables. See Section 4.5.1 [OPTIMIZE TABLE], page 247. Even that the repair in myisamchk is quite secure, it's always a good idea to make a backup before doing a repair (or anything that could make a lot of changes to a table) 4.4.6.1 myisamchk Invocation Syntax myisamchk is invoked like this: shell> myisamchk [options] tbl_name The options specify what you want myisamchk to do. They are described here. (You can also get a list of options by invoking myisamchk --help.) With no options, myisamchk simply checks your table. To get more information or to tell myisamchk to take corrective action, specify options as described here and in the following sections. tbl_name is the database table you want to check/repair. If you run myisamchk some- where other than in the database directory, you must specify the path to the le, because myisamchk has no idea where your database is located. Actually, myisamchk doesn't care whether the les you are working on are located in a database directory; you can copy the les that correspond to a database table into another location and perform recovery operations on them there. You can name several tables on the myisamchk command-line if you wish. You can also specify a name as an index le name (with the `.MYI' sux), which allows you to specify all tables in a directory by using the pattern `*.MYI'. For example, if you are in a database directory, you can check all the tables in the directory like this: shell> myisamchk *.MYI If you are not in the database directory, you can check all the tables there by specifying the path to the directory: shell> myisamchk /path/to/database_dir/*.MYI You can even check all tables in all databases by specifying a wildcard with the path to the MySQL data directory: shell> myisamchk /path/to/datadir/*/*.MYI The recommended way to quickly check all tables is: myisamchk --silent --fast /path/to/datadir/*/*.MYI isamchk --silent /path/to/datadir/*/*.ISM If you want to check all tables and repair all tables that are corrupted, you can use the following line: myisamchk --silent --force --fast --update-state -O key_buffer=64M \ -O sort_buffer=64M -O read_buffer=1M -O write_buffer=1M \ /path/to/datadir/*/*.MYI isamchk --silent --force -O key_buffer=64M -O sort_buffer=64M \ -O read_buffer=1M -O write_buffer=1M /path/to/datadir/*/*.ISM The above assumes that you have more than 64 M free. Note that if you get an error like:

MySQL Reference Manual

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