myisamchk — MyISAM Table-Maintenance Utility
- The myisamchk utility gets information about your database tables or checks, repairs, or optimizes them.
- myisamchk works with MyISAM tables (tables that have .MYD and .MYI files for storing data and indexes).
- The use of myisamchk with partitioned tables is not supported.
How to run this Utility – myisamchk
myisamchk [options] tbl_name
- The options specify what you want myisamchk to do.
- You can also get a list of options by invoking myisamchk –help
- With no options, myisamchk simply checks your table as the default operation
- tbl_name is the database table you want to check or repair.
- If you run myisamchk somewhere other than in the database directory, you must specify the path to the database directory, because myisamchk has no idea where the database is located.
- In fact, myisamchk does not actually care whether the files you are working on are located in a database directory.
- You can copy the files that correspond to a database table into some other 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 table by naming its index file (the file with the .MYI suffix).
This enables you to specify all tables in a directory by using the pattern *.MYI.
Let’s have some example
myisamchk *.MYI
If you are not in the database directory, you can check all the tables there by specifying the path to the directory:
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:
myisamchk /path/to/datadir/*/*.MYI
