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isamchk
Section: User Commands (1)Updated: 19 December 2000
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L 3.23" "MySQL database"
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
isamchk (1), isamlog (1), mysqlaccess (1), mysqladmin (1), mysqlbug (1), mysqld (1), mysqldump (1), mysqlshow (1), msql2mysql (1), perror (1), replace (1), safe_mysqld (1), which1 (1), zap (1),AUTHOR
Ver 1.0, distribution 3.23.29a Michael (Monty) Widenius (monty@tcx.se), TCX Datakonsult AB (http://www.tcx.se). This software comes with no warranty. Manual page by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer (http://www.mercurmedia.com)
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