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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, repairs, optimizes, and analyzes tables.
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, and then sends the statements to the server to be executed.
For details about which storage engines each statement works with, see the descriptions
for those statements in Chapter 11, SQL Statement Syntax.
The MyISAM storage engine supports all four statements, so mysqlcheck can be used to
perform all four operations 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
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 filesystem errors.
There are three general ways to invoke mysqlcheck:
shell> mysqlcheck [options] db_name [tables]
shell> mysqlcheck [options] --databases db_name1 [db_name2 db_name3...]
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:
Table 4.4. mysqlcheck Option Reference
+-------------------------------------+------------------------+---------------------+------------+
|Format | Config File | Description | Introduced |
+-------------------------------------+------------------------+---------------------+------------+
|--all-databases | all-databases | Check all tables in | |
+-------------------------------------+------------------------+ all databases +------------+
|-c | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--check-only-changed | check-only-changed | Check only tables | |
+-------------------------------------+------------------------+ that have changed +------------+
|-C | | since the last | |
| | | check | |
+-------------------------------------+------------------------+---------------------+------------+
|--check-upgrade | check-upgrade | Invoke CHECK TABLE | 5.0.19 |
+-------------------------------------+------------------------+ with the FOR +------------+
|-g | | UPGRADE option | |
+-------------------------------------+------------------------+---------------------+------------+
|--compress | compress | Compress all | |
+-------------------------------------+------------------------+ information sent +------------+
|-C | | between the client | |
| | | and the server | |
+-------------------------------------+------------------------+---------------------+------------+
|--databases | databases | Process all tables | |
+-------------------------------------+------------------------+ in the named +------------+
|-B | | databases | |
+-------------------------------------+------------------------+---------------------+------------+
|-# [debug_options] | debug | | |
+-------------------------------------+------------------------+ Write a debugging +------------+
|-A | | log | |
+-------------------------------------+------------------------+ +------------+
|--debug[=debug_options] | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--default-character-set=charset_name | default-character-set | Use charset_name as | |
| | | the default | |
| | | character set | |
+-------------------------------------+------------------------+---------------------+------------+
|--extended | extended | Check and repair | |
+-------------------------------------+------------------------+ tables +------------+
|-e | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--fast | fast | Check only tables | |
+-------------------------------------+------------------------+ that have not been +------------+
|-F | | closed properly | |
+-------------------------------------+------------------------+---------------------+------------+
|--force | force | Continue even if an | |
+-------------------------------------+------------------------+ SQL error occurs +------------+
|-f | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--help | | Display help | |
+-------------------------------------+------------------------+ message and exit +------------+
|-? | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--all-in-1 | all-in-1 | Execute a single | |
| | | statement for each | |
| | | database that names | |
| | | all the tables | |
| | | from that database | |
+-------------------------------------+------------------------+---------------------+------------+
|--host=host_name | host | Connect to the | |
+-------------------------------------+------------------------+ MySQL server on the +------------+
|-h host_name | | given host | |
+-------------------------------------+------------------------+---------------------+------------+
|--medium-check | medium-check | Do a check that is | |
| | | faster than an | |
| | | --extended | |
| | | operation | |
+-------------------------------------+------------------------+---------------------+------------+
|--optimize | optimize | | |
+-------------------------------------+------------------------+ Optimize the tables +------------+
|-o | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--password[=password] | password | The password to use | |
+-------------------------------------+------------------------+ when connecting to +------------+
|-p[password] | | the server | |
+-------------------------------------+------------------------+---------------------+------------+
|--port=port_num | port | The TCP/IP port | |
+-------------------------------------+------------------------+ number to use for +------------+
|-P port_num | | the connection | |
+-------------------------------------+------------------------+---------------------+------------+
|--protocol={TCP|SOCKET|PIPE|MEMORY} | protocol | The connection | |
+-------------------------------------+------------------------+ protocol to use +------------+
|-1 | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--quick | quick | The fastest method | |
+-------------------------------------+------------------------+ of checking +------------+
|-q | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--repair | repair | Perform a repair | |
+-------------------------------------+------------------------+ that can fix almost +------------+
|-r | | anything except | |
| | | unique keys that | |
| | | are not unique | |
+-------------------------------------+------------------------+---------------------+------------+
|--silent | silent | | |
+-------------------------------------+------------------------+ Silent mode +------------+
|-s | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--socket=path | socket | For connections to | |
+-------------------------------------+------------------------+ localhost +------------+
|-S path | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--ssl-ca=file_name | ssl-ca | The path to a file | |
| | | that contains a | |
| | | list of trusted SSL | |
| | | CAs | |
+-------------------------------------+------------------------+---------------------+------------+
|--ssl-capath=directory_name | ssl-capath | The path to a | |
| | | directory that | |
| | | contains trusted | |
| | | SSL CA certificates | |
| | | in PEM format | |
+-------------------------------------+------------------------+---------------------+------------+
|--analyze | analyze | Analyze the tables | |
+-------------------------------------+------------------------+---------------------+------------+
|--ssl-cert=file_name | ssl-cert | The name of the SSL | |
| | | certificate file to | |
| | | use for | |
| | | establishing a | |
| | | secure connection | |
+-------------------------------------+------------------------+---------------------+------------+
|--ssl-cipher=cipher_list | ssl-cipher | A list of allowable | |
| | | ciphers to use for | |
| | | SSL encryption | |
+-------------------------------------+------------------------+---------------------+------------+
|--ssl-key=file_name | ssl-key | The name of the SSL | |
| | | key file to use for | |
| | | establishing a | |
| | | secure connection | |
+-------------------------------------+------------------------+---------------------+------------+
|--ssl-verify-server-cert | ssl-verify-server-cert | The server's Common | |
| | | Name value in its | |
| | | certificate is | |
| | | verified against | |
| | | the hostname used | |
| | | when connecting to | |
| | | the server | |
+-------------------------------------+------------------------+---------------------+------------+
|--tables | tables | Overrides the | |
| | | --databases or -B | |
| | | option | |
+-------------------------------------+------------------------+---------------------+------------+
|--use-frm | use-frm | For repair | |
| | | operations on | |
| | | MyISAM tables | |
+-------------------------------------+------------------------+---------------------+------------+
|--user=user_name, | user | The MySQL username | |
+-------------------------------------+------------------------+ to use when +------------+
|-u user_name | | connecting to the | |
| | | server | |
+-------------------------------------+------------------------+---------------------+------------+
|--verbose | | | |
+-------------------------------------+------------------------+ +------------+
|-v | | Verbose mode | |
+-------------------------------------+------------------------+ +------------+
|-a | | | |
+-------------------------------------+------------------------+---------------------+------------+
|--version | | Display version | |
+-------------------------------------+------------------------+ information and +------------+
|-V | | exit | |
+-------------------------------------+------------------------+---------------------+------------+
|--auto-repair | auto-repair | If a checked table | |
| | | is corrupted, | |
| | | automatically fix | |
| | | it | |
+-------------------------------------+------------------------+---------------------+------------+
|--character-sets-dir=path | character-sets-dir | The directory where | |
| | | character sets are | |
| | | installed | |
+-------------------------------------+------------------------+---------------------+------------+
|--check | check | Check the tables | |
| | | for errors | |
+-------------------------------------+------------------------+---------------------+------------+
o --help, -?
Display a help message and exit.
o --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.
o --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.
o --analyze, -a
Analyze the tables.
o --auto-repair
If a checked table is corrupted, automatically fix it. Any necessary repairs are done
after all tables have been checked.
o --character-sets-dir=path
The directory where character sets are installed. See Section 2, "The Character Set
Used for Data and Sorting".
o --check, -c
Check the tables for errors. This is the default operation.
o --check-only-changed, -C
Check only tables that have changed since the last check or that have not been closed
properly.
o --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 was added in MySQL 5.0.19.
o --compress
Compress all information sent between the client and the server if both support
compression.
o --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.
o --debug[=debug_options], -# [debug_options]
Write a debugging log. A typical debug_options string is often 'd:t:o,file_name'.
o --default-character-set=charset_name
Use charset_name as the default character set. See Section 2, "The Character Set Used
for Data and Sorting".
o --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!
o --fast, -F
Check only tables that have not been closed properly.
o --force, -f
Continue even if an SQL error occurs.
o --host=host_name, -h host_name
Connect to the MySQL server on the given host.
o --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.
o --optimize, -o
Optimize the tables.
o --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.
Specifying a password on the command line should be considered insecure. See
Section 5.6, "Keeping Your Password Secure".
o --port=port_num, -P port_num
The TCP/IP port number to use for the connection.
o --protocol={TCP|SOCKET|PIPE|MEMORY}
The connection protocol to use.
o --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.
o --repair, -r
Perform a repair that can fix almost anything except unique keys that are not unique.
o --silent, -s
Silent mode. Print only error messages.
o --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.
o --ssl*
Options that begin with --ssl specify whether to connect to the server via SSL and
indicate where to find SSL keys and certificates. See Section 5.7.3, "SSL Command
Options".
o --tables
Overrides the --databases or -B option. All name arguments following the option are
regarded as table names.
o --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.
o --user=user_name, -u user_name
The MySQL username to use when connecting to the server.
o --verbose, -v
Verbose mode. Print information about the various stages of program operation.
o --version, -V
Display version information and exit.
COPYRIGHT
Copyright 2007-2008 MySQL AB
This documentation is free software; you can redistribute it and/or modify it 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 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/).
MySQL 5.0 01/11/2008 MYSQLCHECK(1)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2012-05-26 02:59 @38.107.179.238 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)