mysqlcheck
MYSQLCHECK(1) MySQL Database System MYSQLCHECK(1)
NAME
mysqlcheck - a table maintenance and repair program
SYNOPSIS
mysqlcheck [options] [db_name [tbl_name ...]]
DESCRIPTION
The mysqlcheck client checks and repairs MyISAM tables. It can also
optimize and analyze tables. mysqlcheck is available as of MySQL
3.23.38.
mysqlcheck is similar in function to myisamchk, but works differently.
The main operational difference is that mysqlcheck must be used when
the mysqld server is running, whereas myisamchk should be used when it
is not. The benefit of using mysqlcheck is that you do not have to stop
the server to check or repair your tables.
mysqlcheck uses the SQL statements CHECK TABLE, REPAIR TABLE, ANALYZE
TABLE, and OPTIMIZE TABLE in a convenient way for the user. It
determines which statements to use for the operation you want to
perform, then sends the statements to the server to be executed.
There are three general ways to invoke mysqlcheck:
shell> mysqlcheck [options] db_name [tables]
shell> mysqlcheck [options] --databases DB1 [DB2 DB3...]
shell> mysqlcheck [options] --all-databases
If you do not name any tables or use the --databases or --all-databases
option, entire databases are checked.
mysqlcheck has a special feature compared to the other clients. The
default behavior of checking tables (--check) can be changed by
renaming the binary. If you want to have a tool that repairs tables by
default, you should just make a copy of mysqlcheck named mysqlrepair,
or make a symbolic link to mysqlcheck named mysqlrepair. If you invoke
mysqlrepair, it repairs tables on command.
The following names can be used to change mysqlcheck default behavior:
mysqlrepairThe default option is --repairmysqlanalyzeThe default option
is --analyzemysqloptimizeThe default option is --optimize.PP mysqlcheck
supports the following options:
· --help, -?
Display a help message and exit.
· --all-databases, -A
Check all tables in all databases. This is the same as using the
--databases option and naming all the databases on the command line.
· --all-in-1, -1
Instead of issuing a statement for each table, execute a single
statement for each database that names all the tables from that
database to be processed.
· --analyze, -a
Analyze the tables.
· --auto-repair
If a checked table is corrupted, automatically fix it. Any necessary
repairs are done after all tables have been checked.
· --character-sets-dir=path
The directory where character sets are installed. See Section 7.1,
“The Character Set Used for Data and Sorting”.
· --check, -c
Check the tables for errors.
· --check-only-changed, -C
Check only tables that have changed since the last check or that
have not been closed properly.
· --compress
Compress all information sent between the client and the server if
both support compression.
· --databases, -B
Process all tables in the named databases. With this option, all
name arguments are regarded as database names, not as table names.
· --debug[=debug_options], -# [debug_options]
Write a debugging log. The debug_options string is often
´d:t:o,file_name’.
· --default-character-set=charset
Use charset as the default character set. See Section 7.1, “The
Character Set Used for Data and Sorting”.
· --extended, -e
If you are using this option to check tables, it ensures that they
are 100% consistent but takes a long time.
If you are using this option to repair tables, it runs an extended
repair that may not only take a long time to execute, but may
produce a lot of garbage rows also!
· --fast, -F
Check only tables that have not been closed properly.
· --force, -f
Continue even if an SQL error occurs.
· --host=host_name, -h host_name
Connect to the MySQL server on the given host.
· --medium-check, -m
Do a check that is faster than an --extended operation. This finds
only 99.99% of all errors, which should be good enough in most
cases.
· --optimize, -o
Optimize the tables.
· --password[=password], -p[password]
The password to use when connecting to the server. If you use the
short option form (-p), you cannot have a space between the option
and the password. If you omit the password value following the
--password or -p option on the command line, you are prompted for
one.
· --port=port_num, -P port_num
The TCP/IP port number to use for the connection.
· --protocol={TCP | SOCKET | PIPE | MEMORY}
The connection protocol to use. This option was added in MySQL 4.1.
· --quick, -q
If you are using this option to check tables, it prevents the check
from scanning the rows to check for incorrect links. This is the
fastest check method.
If you are using this option to repair tables, it tries to repair
only the index tree. This is the fastest repair method.
· --repair, -r
Perform a repair that can fix almost anything except unique keys
that are not unique.
· --silent, -s
Silent mode. Print only error messages.
· --socket=path, -S path
The socket file to use for the connection.
· --tables
Overrides the --databases or -B option. All arguments following the
option are regarded as table names.
· --user=user_name, -u user_name
The MySQL username to use when connecting to the server.
· --verbose, -v
Verbose mode. Print information about the various stages of program
operation.
· --version, -V
Display version information and exit.
SEE ALSO
isamchk(1), isamlog(1), msql2mysql(1), myisamchk(1), myisamlog(1),
myisampack(1), mysql(1), mysql.server(1), mysql_config(1),
mysql_fix_privilege_tables(1), mysql_zap(1), mysqlaccess(1),
mysqladmin(1), mysqlbinlog(1), mysqld(1), mysqld_multi(1),
mysqld_safe(1), mysqldump(1), mysqlhotcopy(1), mysqlimport(1),
mysqlshow(1), pack_isam(1), perror(1), replace(1), safe_mysqld(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://dev.mysql.com/doc/.
AUTHOR
MySQL AB (http://www.mysql.com/). This software comes with no
warranty.
MySQL 4.1 11/30/2005 MYSQLCHECK(1)
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