NAME
isamchk
- Description, check and repair of ISAM tables. Used without options all tables on the command will be checked for errors
USAGE
isamchk [OPTIONS] tables[.ISM]
SYNOPSIS
isamchk [-a|--analyze] [-#|--debug=...] [--character-sets-dir=...] [-C|--default-character-set=...] [-d|--description] [-e|--extend-check] [-f|--force] [-?|--help] [-i|--information] [-k|--keys-used=#] [-l|--no-symlinks] [-q|--quick] [-r|--recover] [-o|--safe-recover] [-O|--set-variable var=option] [-s|--silent] [-S|--sort-index] [-R|--sort-records=#] [-u|--unpack] [-v|--verbose] [-V|--version] [-w|--wait]
DESCRIPTION
- -a|--analyze
-
Analyze distribution of keys. Will make some joins in MySQL faster.
- -#|--debug=...
-
Output debug log. Often this is 'd:t:o ,filename`
- --character-sets-dir=...
-
Directory where character sets are
- -C|--default-character-set=...
-
Set the default character set
- -d|--description
-
Prints some information about table.
- -e|--extend-check
-
Check the table VERY thoroughly. One need use this only in extreme cases as isamchk should normally find all errors even without this switch
- -f|--force
-
Overwrite old temporary files. If one uses -f when checking tables (running isamchk without -r), isamchk will automatically restart with -r on any wrong table.
- -?|--help
-
Display help and exit.
- -i|--information
-
Print statistics information about the table
- -k|--keys-used=#
-
Used with '-r'. Tell ISAM to update only the first # keys. This can be used to get faster inserts!
- -l|--no-symlinks
-
Do not follow symbolic links when repairing. Normally isamchk repairs the table a symlink points at.
- -q|--quick
-
Used with -r to get a faster repair. (The data file isn't touched.) One can give a second '-q' to force isamchk to modify the original datafile.
- -r|--recover
-
Can fix almost anything except unique keys that aren't unique.
- -o|--safe-recover
-
Uses old recovery method; slower than '-r' but can handle a couple of cases that '-r' cannot handle.
- -O| --set-variable var=option
-
Change the value of a variable.
- -s|--silent
-
Only print errors. One can use two -s to make isamchk very silent
- -S|--sort-index
-
Sort index blocks. This speeds up 'read-next' in applications
- -R|--sort-records=#
-
Sort records according to an index. This makes your data much more localized and may speed up things (It may be VERY slow to do a sort the first time!)
- -u|--unpack
-
Unpack file packed with pack_isam.
- -v|--verbose
-
Print more information. This can be used with -d and -e. Use many -v for more verbosity!
- -V|--version
-
Print version and exit.
- -w|--wait
-
Wait if table is locked.
SEE ALSO
isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1), mysqld(1), mysqld_multi(1), mysqld_safe(1), mysqldump(1), mysql_fix_privilege_tables(1), mysqlshow(1), mysql_zap(1), perror(1), replace(1)
For more information please refer to the MySQL reference manual, which may already be installed locally and which is also available online at http://www.mysql.com/doc/en/
BUGS
Please refer to http://bugs.mysql.com/ to report bugs.
AUTHOR
Ver 1.0, distribution 4.0.24 Michael (Monty) Widenius ([email protected]), MySQL AB (http://www.mysql.com/). This software comes with no warranty. Manual page by L. (Kill-9) Pedersen ([email protected]), Mercurmedia Data Model Architect / system developer (http://www.mercurmedia.com)