$> mysqlcheck test t
test.t
note     : The storage engine for the table doesn't support check

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 errors.

mysqlcheck [options] db_name [tbl_name ...]
mysqlcheck [options] --databases db_name ...
mysqlcheck [options] --all-databases

•--help, -?

Command-Line Format

--help

Display a help message and exit.

•--all-databases, -A

Command-Line Format

--all-databases

Check all tables in all databases. This is the same as using the --databases option and naming all the databases on the command line, except that the INFORMATION_SCHEMA and performance_schema databases are not checked. They can be checked by explicitly naming them with the --databases option.

•--all-in-1, -1

Command-Line Format

--all-in-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

Command-Line Format

--analyze

Analyze the tables.

•--auto-repair

Command-Line Format

--auto-repair

If a checked table is corrupted, automatically fix it. Any necessary repairs are done after all tables have been checked.

•--bind-address=ip_address

Command-Line Format

--bind-address=ip_address

On a computer having multiple network interfaces, use this option to select which interface to use for connecting to the MySQL server.

•--character-sets-dir=dir_name

Command-Line Format	--character-sets-dir=dir_name
Type	Directory name

The directory where character sets are installed. See Section 10.15, “Character Set Configuration”.

•--check, -c

Command-Line Format

--check

Check the tables for errors. This is the default operation.

•--check-only-changed, -C

Command-Line Format

--check-only-changed

Check only tables that have changed since the last check or that have not been closed properly.

•--check-upgrade, -g

Command-Line Format

--check-upgrade

Invoke CHECK TABLE with the FOR UPGRADE option to check tables for incompatibilities with the current version of the server.

•--compress

Command-Line Format	--compress[={OFF|ON}]
Deprecated	8.0.18
Type	Boolean
Default Value	OFF

Compress all information sent between the client and the server if possible. See Section 4.2.8, “Connection Compression Control”.

As of MySQL 8.0.18, this option is deprecated. Expect it to be removed in a future version of MySQL. See the section called “Configuring Legacy Connection Compression”.

•--compression-algorithms=value

Command-Line Format	--compression-algorithms=value
Introduced	8.0.18
Type	Set
Default Value	uncompressed
Valid Values	zlib zstd uncompressed

The permitted compression algorithms for connections to the server. The available algorithms are the same as for the protocol_compression_algorithms system variable. The default value is uncompressed.

For more information, see Section 4.2.8, “Connection Compression Control”.

This option was added in MySQL 8.0.18.

•--databases, -B

Command-Line Format

--databases

Process all tables in the named databases. Normally, mysqlcheck treats the first name argument on the command line as a database name and any following names as table names. With this option, it treats all name arguments as database names.

•--debug[=debug_options], -# [debug_options]

Command-Line Format	--debug[=debug_options]
Type	String
Default Value	d:t:o

Write a debugging log. A typical debug_options string is d:t:o,file_name. The default is d:t:o.

This option is available only if MySQL was built using WITH_DEBUG. MySQL release binaries provided by Oracle are not built using this option.

•--debug-check

Command-Line Format	--debug-check
Type	Boolean
Default Value	FALSE

Print some debugging information when the program exits.

This option is available only if MySQL was built using WITH_DEBUG. MySQL release binaries provided by Oracle are not built using this option.

•--debug-info

Command-Line Format	--debug-info
Type	Boolean
Default Value	FALSE

Print debugging information and memory and CPU usage statistics when the program exits.

This option is available only if MySQL was built using WITH_DEBUG. MySQL release binaries provided by Oracle are not built using this option.

•--default-character-set=charset_name

Command-Line Format	--default-character-set=charset_name
Type	String

Use charset_name as the default character set. See Section 10.15, “Character Set Configuration”.

•--defaults-extra-file=file_name

Command-Line Format	--defaults-extra-file=file_name
Type	File name

Read this option file after the global option file but (on Unix) before the user option file. If the file does not exist or is otherwise inaccessible, an error occurs. If file_name is not an absolute path name, it is interpreted relative to the current directory.

For additional information about this and other option-file options, see Section 4.2.2.3, “Command-Line Options that Affect Option-File Handling”.

•--defaults-file=file_name

Command-Line Format	--defaults-file=file_name
Type	File name

Use only the given option file. If the file does not exist or is otherwise inaccessible, an error occurs. If file_name is not an absolute path name, it is interpreted relative to the current directory.

Exception: Even with --defaults-file, client programs read .mylogin.cnf.

For additional information about this and other option-file options, see Section 4.2.2.3, “Command-Line Options that Affect Option-File Handling”.

•--defaults-group-suffix=str

Command-Line Format	--defaults-group-suffix=str
Type	String

Read not only the usual option groups, but also groups with the usual names and a suffix of str. For example, mysqlcheck normally reads the [client] and [mysqlcheck] groups. If this option is given as --defaults-group-suffix=_other, mysqlcheck also reads the [client_other] and [mysqlcheck_other] groups.

For additional information about this and other option-file options, see Section 4.2.2.3, “Command-Line Options that Affect Option-File Handling”.

•--extended, -e

Command-Line Format

--extended

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!

•--default-auth=plugin

Command-Line Format	--default-auth=plugin
Type	String

A hint about which client-side authentication plugin to use. See Section 6.2.17, “Pluggable Authentication”.

•--enable-cleartext-plugin

Command-Line Format	--enable-cleartext-plugin
Type	Boolean
Default Value	FALSE

Enable the mysql_clear_password cleartext authentication plugin. (See Section 6.4.1.4, “Client-Side Cleartext Pluggable Authentication”.)

•--fast, -F

Command-Line Format

--fast

Check only tables that have not been closed properly.

•--force, -f

Command-Line Format

--force

Continue even if an SQL error occurs.

•--get-server-public-key

Command-Line Format	--get-server-public-key
Type	Boolean

Request from the server the public key required for RSA key pair-based password exchange. This option applies to clients that authenticate with the caching_sha2_password authentication plugin. For that plugin, the server does not send the public key unless requested. This option is ignored for accounts that do not authenticate with that plugin. It is also ignored if RSA-based password exchange is not used, as is the case when the client connects to the server using a secure connection.

If --server-public-key-path=file_name is given and specifies a valid public key file, it takes precedence over --get-server-public-key.

For information about the caching_sha2_password plugin, see Section 6.4.1.2, “Caching SHA-2 Pluggable Authentication”.

•--host=host_name, -h host_name

Command-Line Format	--host=host_name
Type	String
Default Value	localhost

Connect to the MySQL server on the given host.

•--login-path=name

Command-Line Format	--login-path=name
Type	String

Read options from the named login path in the .mylogin.cnf login path file. A “login path” is an option group containing options that specify which MySQL server to connect to and which account to authenticate as. To create or modify a login path file, use the mysql_config_editor utility. See mysql_config_editor(1).

For additional information about this and other option-file options, see Section 4.2.2.3, “Command-Line Options that Affect Option-File Handling”.

•--medium-check, -m

Command-Line Format

--medium-check

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

Command-Line Format

--no-defaults

Do not read any option files. If program startup fails due to reading unknown options from an option file, --no-defaults can be used to prevent them from being read.

The exception is that the .mylogin.cnf file is read in all cases, if it exists. This permits passwords to be specified in a safer way than on the command line even when --no-defaults is used. To create .mylogin.cnf, use the mysql_config_editor utility. See mysql_config_editor(1).

For additional information about this and other option-file options, see Section 4.2.2.3, “Command-Line Options that Affect Option-File Handling”.

•--optimize, -o

Command-Line Format

--optimize

Optimize the tables.

•--password[=password], -p[password]

Command-Line Format	--password[=password]
Type	String

The password of the MySQL account used for connecting to the server. The password value is optional. If not given, mysqlcheck prompts for one. If given, there must be no space between --password= or -p and the password following it. If no password option is specified, the default is to send no password.

Specifying a password on the command line should be considered insecure. To avoid giving the password on the command line, use an option file. See Section 6.1.2.1, “End-User Guidelines for Password Security”.

To explicitly specify that there is no password and that mysqlcheck should not prompt for one, use the --skip-password option.

•--password1[=pass_val] The password for multifactor authentication factor 1 of the MySQL account used for connecting to the server. The password value is optional. If not given, mysqlcheck prompts for one. If given, there must be no space between --password1= and the password following it. If no password option is specified, the default is to send no password.

Specifying a password on the command line should be considered insecure. To avoid giving the password on the command line, use an option file. See Section 6.1.2.1, “End-User Guidelines for Password Security”.

To explicitly specify that there is no password and that mysqlcheck should not prompt for one, use the --skip-password1 option.

--password1 and --password are synonymous, as are --skip-password1 and --skip-password.

•--password2[=pass_val] The password for multifactor authentication factor 2 of the MySQL account used for connecting to the server. The semantics of this option are similar to the semantics for --password1; see the description of that option for details.

•--password3[=pass_val] The password for multifactor authentication factor 3 of the MySQL account used for connecting to the server. The semantics of this option are similar to the semantics for --password1; see the description of that option for details.

•--pipe, -W

Command-Line Format	--pipe
Type	String

On Windows, connect to the server using a named pipe. This option applies only if the server was started with the named_pipe system variable enabled to support named-pipe connections. In addition, the user making the connection must be a member of the Windows group specified by the named_pipe_full_access_group system variable.

•--plugin-dir=dir_name

Command-Line Format	--plugin-dir=dir_name
Type	Directory name

The directory in which to look for plugins. Specify this option if the --default-auth option is used to specify an authentication plugin but mysqlcheck does not find it. See Section 6.2.17, “Pluggable Authentication”.

•--port=port_num, -P port_num

Command-Line Format	--port=port_num
Type	Numeric
Default Value	3306

For TCP/IP connections, the port number to use.

•--print-defaults

Command-Line Format

--print-defaults

Print the program name and all options that it gets from option files.

For additional information about this and other option-file options, see Section 4.2.2.3, “Command-Line Options that Affect Option-File Handling”.

•--protocol={TCP|SOCKET|PIPE|MEMORY}

Command-Line Format	--protocol=type
Type	String
Default Value	[see text]
Valid Values	TCP SOCKET PIPE MEMORY

The transport protocol to use for connecting to the server. It is useful when the other connection parameters normally result in use of a protocol other than the one you want. For details on the permissible values, see Section 4.2.7, “Connection Transport Protocols”.

•--quick, -q

Command-Line Format

--quick

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

Command-Line Format

--repair

Perform a repair that can fix almost anything except unique keys that are not unique.

•--server-public-key-path=file_name

Command-Line Format	--server-public-key-path=file_name
Type	File name

The path name to a file in PEM format containing a client-side copy of the public key required by the server for RSA key pair-based password exchange. This option applies to clients that authenticate with the sha256_password or caching_sha2_password authentication plugin. This option is ignored for accounts that do not authenticate with one of those plugins. It is also ignored if RSA-based password exchange is not used, as is the case when the client connects to the server using a secure connection.

If --server-public-key-path=file_name is given and specifies a valid public key file, it takes precedence over --get-server-public-key.

For sha256_password, this option applies only if MySQL was built using OpenSSL.

For information about the sha256_password and caching_sha2_password plugins, see Section 6.4.1.3, “SHA-256 Pluggable Authentication”, and Section 6.4.1.2, “Caching SHA-2 Pluggable Authentication”.

•--shared-memory-base-name=name

Command-Line Format	--shared-memory-base-name=name
Platform Specific	Windows

On Windows, the shared-memory name to use for connections made using shared memory to a local server. The default value is MYSQL. The shared-memory name is case-sensitive.

This option applies only if the server was started with the shared_memory system variable enabled to support shared-memory connections.

•--silent, -s

Command-Line Format

--silent

Silent mode. Print only error messages.

•--skip-database=db_name

Command-Line Format

--skip-database=db_name

Do not include the named database (case-sensitive) in the operations performed by mysqlcheck.

•--socket=path, -S path

Command-Line Format	--socket={file_name|pipe_name}
Type	String

For connections to localhost, the Unix socket file to use, or, on Windows, the name of the named pipe to use.

On Windows, this option applies only if the server was started with the named_pipe system variable enabled to support named-pipe connections. In addition, the user making the connection must be a member of the Windows group specified by the named_pipe_full_access_group system variable.

•--ssl* Options that begin with --ssl specify whether to connect to the server using encryption and indicate where to find SSL keys and certificates. See the section called “Command Options for Encrypted Connections”.

•--ssl-fips-mode={OFF|ON|STRICT}

Command-Line Format	--ssl-fips-mode={OFF|ON|STRICT}
Deprecated	8.0.34
Type	Enumeration
Default Value	OFF
Valid Values	OFF ON STRICT

Controls whether to enable FIPS mode on the client side. The --ssl-fips-mode option differs from other --ssl-xxx options in that it is not used to establish encrypted connections, but rather to affect which cryptographic operations to permit. See Section 6.8, “FIPS Support”.

These --ssl-fips-mode values are permitted:

As of MySQL 8.0.34, this option is deprecated. Expect it to be removed in a future version of MySQL.

•--tables

Command-Line Format

--tables

Override the --databases or -B option. All name arguments following the option are regarded as table names.

•--tls-ciphersuites=ciphersuite_list

Command-Line Format	--tls-ciphersuites=ciphersuite_list
Introduced	8.0.16
Type	String

The permissible ciphersuites for encrypted connections that use TLSv1.3. The value is a list of one or more colon-separated ciphersuite names. The ciphersuites that can be named for this option depend on the SSL library used to compile MySQL. For details, see Section 6.3.2, “Encrypted Connection TLS Protocols and Ciphers”.

This option was added in MySQL 8.0.16.

•--tls-version=protocol_list

Command-Line Format	--tls-version=protocol_list
Type	String
Default Value (≥ 8.0.16)	TLSv1,TLSv1.1,TLSv1.2,TLSv1.3 (OpenSSL 1.1.1 or higher) TLSv1,TLSv1.1,TLSv1.2 (otherwise)
Default Value (≤ 8.0.15)	TLSv1,TLSv1.1,TLSv1.2

The permissible TLS protocols for encrypted connections. The value is a list of one or more comma-separated protocol names. The protocols that can be named for this option depend on the SSL library used to compile MySQL. For details, see Section 6.3.2, “Encrypted Connection TLS Protocols and Ciphers”.

•--use-frm

Command-Line Format

--use-frm

For repair operations on MyISAM tables, get the table structure from the data dictionary so that the table can be repaired even if the .MYI header is corrupted.

•--user=user_name, -u user_name

Command-Line Format	--user=user_name,
Type	String

The user name of the MySQL account to use for connecting to the server.

•--verbose, -v

Command-Line Format

--verbose

Verbose mode. Print information about the various stages of program operation.

•--version, -V

Command-Line Format

--version

Display version information and exit.

•--write-binlog

Command-Line Format

--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 replicas or run when using the binary logs for recovery from backup.

•--zstd-compression-level=level

Command-Line Format	--zstd-compression-level=#
Introduced	8.0.18
Type	Integer

The compression level to use for connections to the server that use the zstd compression algorithm. The permitted levels are from 1 to 22, with larger values indicating increasing levels of compression. The default zstd compression level is 3. The compression level setting has no effect on connections that do not use zstd compression.

For more information, see Section 4.2.8, “Connection Compression Control”.

This option was added in MySQL 8.0.18.