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MARIADB-CHECK(1) MariaDB Database System MARIADB-CHECK(1) NAME mariadb-check - a table maintenance program (mariadb-check is now a symlink to mariadb-check) SYNOPSIS mariadb-check [options] [db_name [tbl_name ...]] DESCRIPTION The mariadb-check 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, par- ticularly for large tables. If you use the --databases or --all-databases option to process all tables in one or more databases, an invocation of mariadb-check might take a long time. (This is also true for mariadb-up- grade because that program invokes mariadb-check to check all tables and repair them if necessary.) mariadb-check is similar in function to myisamchk, but works differently. The main operational difference is that mariadb-check must be used when the mariadbd server is running, whereas myisamchk should be used when it is not. The benefit of using mariadb-check is that you do not have to stop the server to perform table maintenance. mariadb-check 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 mariadb-check 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> mariadb-check test t test.t note : The storage engine for the table doesn't support check If mariadb-check is unable to repair a table, see the MariaDB Documentation for manual table repair strategies. This will be the case, for example, for InnoDB tables, which can be checked with CHECK TABLE, but not repaired with REPAIR TABLE. The use of mariadb-check with partitioned tables is not supported. Caution It is best to make a backup of a table before performing a table repair operation; under some circumstances the operation might cause data loss. Possible causes include but are not limited to file system er- rors. There are three general ways to invoke mariadb-check: shell> mariadb-check [options] db_name [tbl_name ...] shell> mariadb-check [options] --databases db_name ... shell> mariadb-check [options] --all-databases If you do not name any tables following db_name or if you use the --data- bases or --all-databases option, entire databases are checked. mariadb-check has a special feature compared to other client programs. 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 mariadb-check named mariadb-repair, or make a symbolic link to mariadb-check named mariadb-repair. If you invoke mariadb- repair, it repairs tables. The following names can be used to change mariadb-check default behavior. +----------------+-----------------------------+ | mariadb-repair | The default option is --re- | | | pair | +----------------+-----------------------------+ | mysqlanalyze | The default option is --an- | | | alyze | +----------------+-----------------------------+ | mysqloptimize | The default option is --op- | | | timize | +----------------+-----------------------------+ mariadb-check supports the following options, which can be specified on the command line or in the [mariadb-check] and [client] option file groups. The -c, -r, -a and -o options are exclusive to each other. * --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 state- ment 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 in- compatibilities with the current version of the server. This option au- tomatically 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, mariadb-check 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 re- pair 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 data- base 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, mariadb-check prompts for one. Specifying a password on the command line should be considered inse- cure. 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 PERSISTENT 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. * --port=port_num, -P port_num The TCP/IP port number to use for the connection. Forces --proto- col=tcp when specified on the command line without other connection properties. * --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). Pos- sible 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 use- ful when the other connection parameters normally would cause a proto- col 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 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 Win- dows, the name of the named pipe to use. Forces --protocol=socket when specified on the command line without other connection properties; on Windows, forces --protocol=pipe. * --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 op- eration. Using one --verbose option will give you more information about what mariadb-check 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 dur- ing the check phase. * --version, -V Display version information and exit. * --write-binlog This option is enabled by default, so that ANALYZE TABLE, OPTIMIZE TA- BLE, and REPAIR TABLE statements generated by mariadb-check 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 repli- cation slaves or run when using the binary logs for recovery from backup. COPYRIGHT Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc., 2010-2025 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 02110-1335 USA or see http://www.gnu.org/licenses/. SEE ALSO For more information, please refer to the MariaDB Documentation, available online at https://mariadb.com/docs/ AUTHOR MariaDB Foundation (http://www.mariadb.org/). MariaDB 11.8 5 March 2025 MARIADB-CHECK(1)
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