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MYSQLCHECK(1) | MariaDB Database System | MYSQLCHECK(1) |
NAME¶
mysqlcheck - a table maintenance programSYNOPSIS¶
mysqlcheck [options]
[db_name [tbl_name ...]]
DESCRIPTION¶
The mysqlcheck client performs table maintenance: It checks, repairs, optimizes, or analyzes tables. Each table is locked and therefore unavailable to other sessions while it is being processed, although for check operations, the table is locked with a READ lock only. Table maintenance operations can be time-consuming, particularly for large tables. If you use the --databases or --all-databases option to process all tables in one or more databases, an invocation of mysqlcheck might take a long time. (This is also true for mysql_upgrade because that program invokes mysqlcheck to check all tables and repair them if necessary.) 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 perform table maintenance. 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, and then sends the statements to the server to be executed. The MyISAM storage engine supports all four maintenance operations, so mysqlcheck can be used to perform any of them on MyISAM tables. Other storage engines do not necessarily support all operations. In such cases, an error message is displayed. For example, if test.t is a MEMORY table, an attempt to check it produces this result:shell> mysqlcheck test t test.t note : The storage engine for the table doesn´t support check
shell> mysqlcheck [options] db_name [tbl_name ...] shell> mysqlcheck [options] --databases db_name ... shell> mysqlcheck [options] --all-databases
mysqlrepair | The default option is --repair |
mysqlanalyze | The default option is --analyze |
mysqloptimize | The default option is --optimize |
•--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.
•--check, -c
Check the tables for errors. This is the default operation.
•--check-only-changed, -C
Check only tables that have changed since the last check or that have not been
closed properly.
•--check-upgrade, -g
Invoke CHECK TABLE with the FOR UPGRADE option to check tables for
incompatibilities with the current version of the server. This option
automatically enables the --fix-db-names and --fix-table-names
options.
•--compress
Compress all information sent between the client and the server if both support
compression.
•--databases, -B
Process all tables in the named databases. Normally, mysqlcheck treats
the first name argument on the command line as a database name and following
names as table names. With this option, it treats all name arguments as
database names.
•--debug[=debug_options],
-# [debug_options]
Write a debugging log. A typical debug_options string is ´d:t:o,
file_name´. The default is ´d:t:o´.
•--debug-check
Print some debugging information when the program exits.
•--debug-info
Print debugging information and memory and CPU usage statistics when the program
exits.
•--default-auth=name
Default authentication client-side plugin to use.
•--default-character-set=charset_name
Use charset_name as the default character set.
•--defaults-extra-file=filename
Set filename as the file to read default options from after the
global defaults files has been read. Must be given as first option.
•--defaults-file=filename
Set filename as the file to read default options from, override
global defaults files. Must be given as first option.
•--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 will force using the old,
slow, repair with keycache method, instead of the much faster repair by
sorting.
•--fast, -F
Check only tables that have not been closed properly.
•--fix-db-names
Convert database names to the format used since MySQL 5.1. Only database names
that contain special characters are affected.
•--fix-table-names
Convert table names (including views) to the format used since MySQL 5.1. Only
table names that contain special characters are affected.
•--flush,
Flush each table after check. This is useful if you don't want to have the
checked tables take up space in the caches after the check.
•--force, -f
Continue even if an SQL error occurs.
•--host=host_name, -h
host_name
Connect to the MariaDB 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.
•--no-defaults
Do not read default options from any option file. This must be given as the
first argument.
•--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, mysqlcheck
prompts for one.
Specifying a password on the command line should be considered insecure. You can
use an option file to avoid giving the password on the command line.
•--persistent, -Z
Used with ANALYZE TABLE to append the option PERSISENT FOR ALL.
•--pipe, -W
On Windows, connect to the server via a named pipe. This option applies only if
the server supports named-pipe connections.
•--plugin-dir=name
Directory for client-side plugins.
Directory for client-side plugins.
•--port=port_num, -P
port_num
The TCP/IP port number to use for the connection.
•--print-defaults
Print the program argument list and exit. This must be given as the first
argument.
•--process-tables
Perform the requested operation on tables. Defaults to on; use
--skip-process-tables to disable.
•--process-views=val
Perform the requested operation (only CHECK VIEW or REPAIR VIEW). Possible
values are NO, YES (correct the checksum, if necessary, add the
mariadb-version field), UPGRADE_FROM_MYSQL (same as YES and toggle the
algorithm MERGE<->TEMPTABLE.
•--protocol={TCP|SOCKET|PIPE|MEMORY}
The connection protocol to use for connecting to the server. It is useful when
the other connection parameters normally would cause a protocol to be used
other than the one you want.
•--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.
•--skip-database=db_name
-s
Don't process the database (case-sensitive) specified as argument.
•--socket=path, -S
path
For connections to localhost, the Unix socket file to use, or, on Windows, the
name of the named pipe to use.
•--ssl
Enable SSL for connection (automatically enabled with other flags). Disable with
--skip-ssl.
•--ssl-ca=name
CA file in PEM format (check OpenSSL docs, implies --ssl).
•--ssl-capath=name
CA directory (check OpenSSL docs, implies --ssl).
•--ssl-cert=name
X509 cert in PEM format (check OpenSSL docs, implies --ssl).
•--ssl-cipher=name
SSL cipher to use (check OpenSSL docs, implies --ssl).
•--ssl-key=name
X509 key in PEM format (check OpenSSL docs, implies --ssl).
•--ssl-crl=name
Certificate revocation list (check OpenSSL docs, implies --ssl).
•--ssl-crlpath=name
Certificate revocation list path (check OpenSSL docs, implies
--ssl).
•--ssl-verify-server-cert
Verify server's "Common Name" in its cert against hostname used when
connecting. This option is disabled by default.
•--tables
Override the --databases or -B option. All name arguments
following the option are regarded as table names.
•--use-frm
For repair operations on MyISAM tables, get the table structure from the .frm
file so that the table can be repaired even if the .MYI header is
corrupted.
•--user=user_name, -u
user_name
The MariaDB user name to use when connecting to the server.
•--verbose, -v
Verbose mode. Print information about the various stages of program operation.
Using one --verbose option will give you more information about what
mysqlcheck is doing.
Using two --verbose options will also give you connection information.
Using it 3 times will print out all CHECK, RENAME and ALTER TABLE during the
check phase.
•--version, -V
Display version information and exit.
•--write-binlog
This option is enabled by default, so that ANALYZE TABLE, OPTIMIZE TABLE, and
REPAIR TABLE statements generated by mysqlcheck are written to the
binary log. Use --skip-write-binlog to cause NO_WRITE_TO_BINLOG to be
added to the statements so that they are not logged. Use the
--skip-write-binlog when these statements should not be sent to
replication slaves or run when using the binary logs for recovery from
backup.
COPYRIGHT¶
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc., 2010-2015 MariaDB Foundation This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.SEE ALSO¶
For more information, please refer to the MariaDB Knowledge Base, available online at https://mariadb.com/kb/AUTHOR¶
MariaDB Foundation (http://www.mariadb.org/).27/12/2015 | MariaDB 10.0 |