mysqlcheck

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Adatok

Licenc:
Verziószám: 2.7.4-MariaDB Distrib 10.3.23-MariaDB, for debian-linux-gnu
Fejlesztő/tulajdonos: Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Rövid leírás:

A mysqlcheck linux parancs manual oldala és súgója. A mysqlcheck kliensprogram tábla karbantartást végez: ellenőrzi, javítja, optimalizálja vagy elemzi a táblákat.

A művelet során minden tábla zárolásra kerül, ezért a táblák a karbantartás közben más munkamenetek számára nem érhetők el, bár az ellenőrzési műveletek alatt csak READ zárolásra kerül sor. A tábla karbantartási műveletek időigényesek lehetnek, különösen a nagy táblák esetén. Ha a program a --databses vagy a --all-databases opcióval kerül meghívásra egy vagy több adatbázis összes táblájának feldolgozásához, a a mysqlcheck futtatása sokáig is eltarthat. (Ez a mysql_upgrade parancsra is igaz, mert ez a program a mysqlcheck-et hívja meg, hogy ellenőrizze az összes táblát és szükség esetén javítsa őket.)

 

 

Man oldal kimenet

man mysqlcheck
MYSQLCHECK(1)                      MariaDB Database System                     MYSQLCHECK(1)

NAME
       mysqlcheck - a table maintenance program

SYNOPSIS
       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

       If mysqlcheck is unable to repair a table, see the MariaDB Knowledge Base 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 mysqlcheck 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 errors.

       There are three general ways to invoke mysqlcheck:

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

       If you do not name any tables following db_name or if you use the --databases or
       --all-databases option, entire databases are checked.

       mysqlcheck 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
       mysqlcheck named mysqlrepair, or make a symbolic link to mysqlcheck named
       mysqlrepair. If you invoke mysqlrepair, it repairs tables.

       The following names can be used to change mysqlcheck default behavior.

       ┌──────────────┬─────────────────────────────────┐
       │mysqlrepair   │ The default option is --repair  │
       ├──────────────┼─────────────────────────────────┤
       │mysqlanalyze  │ The default option is --analyze │
       ├──────────────┼─────────────────────────────────┤
       │mysqloptimize │ The default option is           │
       │              │ --optimize                      │
       └──────────────┴─────────────────────────────────┘

       mysqlcheck supports the following options, which can be specified on the command line
       or in the [mysqlcheck] 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 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.

       •   --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 02110-1335 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/).

MariaDB 10.3                             9 May 2017                            MYSQLCHECK(1)

 

 

Súgó kimenet

mysqlcheck --help
mysqlcheck  Ver 2.7.4-MariaDB Distrib 10.3.23-MariaDB, for debian-linux-gnu (x86_64)
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

This program can be used to CHECK (-c, -m, -C), REPAIR (-r), ANALYZE (-a),
or OPTIMIZE (-o) tables. Some of the options (like -e or -q) can be
used at the same time. Not all options are supported by all storage engines.
The options -c, -r, -a, and -o are exclusive to each other, which
means that the last option will be used, if several was specified.

The option -c (--check) will be used by default, if none was specified.
You can change the default behavior by making a symbolic link, or
copying this file somewhere with another name, the alternatives are:
mysqlrepair:   The default option will be -r
mysqlanalyze:  The default option will be -a
mysqloptimize: The default option will be -o

Usage: mysqlcheck [OPTIONS] database [tables]
OR     mysqlcheck [OPTIONS] --databases DB1 [DB2 DB3...]
Please consult the MariaDB Knowledge Base at
https://mariadb.com/kb/en/mysqlcheck for latest information about
this program.

Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf 
The following groups are read: mysqlcheck client client-server client-mariadb
The following options may be given as the first argument:
--print-defaults          Print the program argument list and exit.
--no-defaults             Don't read default options from any option file.
The following specify which files/extra groups are read (specified before remaining options):
--defaults-file=#         Only read default options from the given file #.
--defaults-extra-file=#   Read this file after the global files are read.
--defaults-group-suffix=# Additionally read default groups with # appended as a suffix.

  -A, --all-databases Check all the databases. This is the same as --databases
                      with all databases selected.
  -a, --analyze       Analyze given tables.
  -1, --all-in-1      Instead of issuing one query for each table, use one
                      query per database, naming all tables in the database in
                      a comma-separated list.
  --auto-repair       If a checked table is corrupted, automatically fix it.
                      Repairing will be done after all tables have been
                      checked, if corrupted ones were found.
  --character-sets-dir=name 
                      Directory for character set files.
  -c, --check         Check table for errors.
  -C, --check-only-changed 
                      Check only tables that have changed since last check or
                      haven't been closed properly.
  -g, --check-upgrade Check tables for version-dependent changes. May be used
                      with --auto-repair to correct tables requiring
                      version-dependent updates.
  --compress          Use compression in server/client protocol.
  -B, --databases     Check several databases. Note the difference in usage; in
                      this case no tables are given. All name arguments are
                      regarded as database names.
  -#, --debug[=#]     This is a non-debug version. Catch this and exit.
  --debug-check       Check memory and open file usage at exit.
  --debug-info        Print some debug info at exit.
  --default-character-set=name 
                      Set the default character set.
  --default-auth=name Default authentication client-side plugin to use.
  -F, --fast          Check only tables that haven't been closed properly.
  --fix-db-names      Fix database names.
  --fix-table-names   Fix table names.
  -f, --force         Continue even if we get an SQL error.
  -e, --extended      If you are using this option with CHECK TABLE, it will
                      ensure that the table is 100 percent consistent, but will
                      take a long time. If you are using this option with
                      REPAIR TABLE, it will force using old slow repair with
                      keycache method, instead of much faster repair by
                      sorting.
  --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
  -?, --help          Display this help message and exit.
  -h, --host=name     Connect to host.
  -m, --medium-check  Faster than extended-check, but only finds 99.99 percent
                      of all errors. Should be good enough for most cases.
  --write-binlog      Log ANALYZE, OPTIMIZE and REPAIR TABLE commands. Use
                      --skip-write-binlog when commands should not be sent to
                      replication slaves.
                      (Defaults to on; use --skip-write-binlog to disable.)
  -o, --optimize      Optimize table.
  -p, --password[=name] 
                      Password to use when connecting to server. If password is
                      not given, it's solicited on the tty.
  -Z, --persistent    When using ANALYZE TABLE use the PERSISTENT FOR ALL
                      option.
  --plugin-dir=name   Directory for client-side plugins.
  -P, --port=#        Port number to use for connection or 0 for default to, in
                      order of preference, my.cnf, $MYSQL_TCP_PORT,
                      /etc/services, built-in default (3306).
  --protocol=name     The protocol to use for connection (tcp, socket, pipe,
                      memory).
  -q, --quick         If you are using this option with CHECK TABLE, it
                      prevents the check from scanning the rows to check for
                      wrong links. This is the fastest check. If you are using
                      this option with REPAIR TABLE, it will try to repair only
                      the index tree. This is the fastest repair method for a
                      table.
  -r, --repair        Can fix almost anything except unique keys that aren't
                      unique.
  -s, --silent        Print only error messages.
  --skip-database=name 
                      Don't process the database specified as argument
  -S, --socket=name   The socket file to use for connection.
  --ssl               Enable SSL for connection (automatically enabled with
                      other flags).
  --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 (implies --ssl).
  --ssl-cipher=name   SSL cipher to use (implies --ssl).
  --ssl-key=name      X509 key in PEM format (implies --ssl).
  --ssl-crl=name      Certificate revocation list (implies --ssl).
  --ssl-crlpath=name  Certificate revocation list path (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            Overrides option --databases (-B).
  --use-frm           When used with REPAIR, get table structure from .frm
                      file, so the table can be repaired even if .MYI header is
                      corrupted.
  -u, --user=name     User for login if not current user.
  -v, --verbose       Print info about the various stages; Using it 3 times
                      will print out all CHECK, RENAME and ALTER TABLE during
                      the check phase.
  -V, --version       Output version information and exit.
  --process-views[=name] 
                      Perform the requested operation (check or repair) on
                      views. One of: NO, YES (correct the checksum, if
                      necessary, add the mariadb-version field),
                      UPGRADE_FROM_MYSQL (same as YES and toggle the algorithm
                      MERGE<->TEMPTABLE.
  --process-tables    Perform the requested operation on tables.
                      (Defaults to on; use --skip-process-tables to disable.)

Variables (--variable-name=value)
and boolean options {FALSE|TRUE}  Value (after reading options)
--------------------------------- ----------------------------------------
all-databases                     FALSE
all-in-1                          FALSE
auto-repair                       FALSE
character-sets-dir                (No default value)
compress                          FALSE
databases                         FALSE
debug-check                       FALSE
debug-info                        FALSE
default-character-set             utf8mb4
default-auth                      (No default value)
fast                              FALSE
fix-db-names                      FALSE
fix-table-names                   FALSE
force                             FALSE
extended                          FALSE
flush                             FALSE
host                              (No default value)
write-binlog                      TRUE
persistent                        FALSE
plugin-dir                        (No default value)
port                              0
quick                             FALSE
silent                            FALSE
skip-database                     (No default value)
socket                            /var/run/mysqld/mysqld.sock
ssl                               FALSE
ssl-ca                            (No default value)
ssl-capath                        (No default value)
ssl-cert                          (No default value)
ssl-cipher                        (No default value)
ssl-key                           (No default value)
ssl-crl                           (No default value)
ssl-crlpath                       (No default value)
ssl-verify-server-cert            FALSE
use-frm                           FALSE
user                              (No default value)
process-views                     NO
process-tables                    TRUE

 

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