Tartalom
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
Kapcsolódó tartalom
- 26 megtekintés