mysqld(1)
NAME
mysqld - The MySQL server demon
USAGE
mysqld [OPTIONS]
SYNOPSIS
mysqld [--ansi] [-b|--basedir=path] [--big-tables] [--bind-address=IP]
[--character-sets-dir=path] [--chroot=path] [-h|--datadir=path]
[--default-character-set=charset] [--default-table-type=type]
[--delay-key-write-for-all-tables] [--enable-locking] [-T|--exit-info]
[--flush] [-?|--help] [--init-file=file] [-L|--language=...]
[-l|--log[=file]] [--log-isam[=file]] [--log-slow-queries[=file]]
[--log-update[=file]] [--log-long-format] [--low-priority-updates]
[--memlock] [ --myisam-recover [=option[,option...]]] where option is
one of DEFAULT, BACKUP, FORCE or QUICK.] [--pid-file=path]
[-P|--port=...] [-o|--old-protocol] [--one-thread] [-O|--set-variable-
var=option] [-Sg|--skip-grant-tables] [--safe-mode] [--secure]
[--skip-concurrent-insert] [--skip-delay-key-write] [--skip-locking]
[--skip-name-resolve] [--skip-networking] [--skip-new]
[--skip-host-cache] [--skip-show-database] [--skip-thread-priority]
[--socket=path] [-t|--tmpdir=path] [-u|--user=user_name] [-V|--version]
DESCRIPTION
--ansi Use ANSI SQL syntax instead of MySQL syntax. See section 5.2
Running MySQL in ANSI Mode.
-b|--basedir=path
Path to installation directory. All paths are usually resolved
relative to this.
--big-tables
Allow big result sets by saving all temporary sets on file. It
solves most 'table full' errors, but also slows down the queries
where in-memory tables would suffice. Since Version 3.23.2,
MySQL is able to solve it automaticaly by using memory for small
temporary tables and switching to disk tables where necessary.
--bind-address=IP
IP address to bind to.
--character-sets-dir=path
Directory where character sets are. See section 10.1.1 The Char-
acter Set Used for Data and Sorting.
--chroot=path
Chroot mysqld daemon during startup. Recommended security mea-
sure. It will somewhat limit LOAD DATA INFILE and SELECT ...
INTO OUTFILE though.
-h|--datadir=path
Path to the database root.
--default-character-set=charset
Set the default character set. See section 10.1.1 The Character
Set Used for Data and Sorting.
--default-table-type=type
Set the default table type for tables. See section 8 MySQL Table
Types.
--delay-key-write-for-all-tables
Don't flush key buffers between writes for any MyISAM table. See
Mysql Manual section 12.2.3 Tuning Server Parameters.
--enable-locking
Enable system locking.
-T|--exit-info
Print some debug info at exit.
--flush
Flush all changes to disk after each SQL command. Normally MySQL
only does a write of all changes to disk after each SQL command
and lets the operating system handle the syncing to disk. See
section 20.2 What to Do if MySQL Keeps Crashing.
-?|--help
Display short help and exit.
--init-file=file
Read SQL commands from this file at startup.
-L|--language=...
Client error messages in given language. May be given as a full
path. See Mysql Manual section 10.1 What Languages Are Supported
by MySQL?.
-l|--log[=file]
Log connections and queries to file.
--log-isam[=file]
Log all ISAM/MyISAM changes to file (only used when debugging
ISAM/MyISAM).
--log-slow-queries[=file]
Log all queries that have taken more than long_query_time sec-
onds to execute to file. See Mysql Manual section 21.5 The Slow
Query Log.
--log-update[=file]
Log updates to file.# where # is a unique number if not given.
See Mysql Manual section 21.3 The Update Log.
--log-long-format
Log some extra information to update log. If you are using
--log-slow-queries then queries that are not using indexes are
logged to the slow query log.
--low-priority-updates
Table-modifying operations (INSERT/DELETE/UPDATE) will have
lower priority than selects. It can also be done via {INSERT |
REPLACE | UPDATE | DELETE} LOW_PRIORITY ... to lower the prior-
ity of only one query, or by SET OPTION SQL_LOW_PRIOR-
ITY_UPDATES=1 to change the priority in one thread. See Mysql
Manual section 12.2.9 Table Locking Issues.
--memlock
Lock the mysqld process in memory. This works only if your sys-
tem supports the mlockall() system call. This may help if you
have a problem where the operating system is causing mysqld to
swap on disk.
--myisam-recover [=option[,option...]]] where option is one of
DEFAULT, BACKUP, FORCE or QUICK.
If this option is used, mysqld will on open check if the table
is marked as crashed or if if the table wasn't closed properly
(The last option only works if you are running with --skip-lock-
ing). If this is the case mysqld will run check on the table. If
the table was corrupted, mysqld will attempt to repair it. The
following options affects how the repair works. DEFAULT The
same as not giving any option to --myisam-recover. BACKUP If
the data table was changed during recover, save a backup of the
`table_name.MYD' data file as `table_name-datetime.BAK'. FORCE
Run recover even if we will loose more than one row from the
.MYD file. QUICK Don't check the rows in the table if there
isn't any delete blocks. Before a table is automaticly
repaired, mysqld will add a note about this in the error log. If
you want to be able to recover from most things without user
intervention, you should use the options BACKUP,FORCE. This will
force a repair of a table even if some rows would be deleted,
but it will keep the old data file as a backup so that you can
later examine what happened.
--pid-file=path
Path to pid file used by mysqld_safe.
-P|--port=...
Port number to listen for TCP/IP connections.
-o|--old-protocol
Use the 3.20 protocol for compatibility with some very old
clients. See Mysql Manual section 4.17.3 Upgrading from Version
3.20 to Version 3.21.
--one-thread
Only use one thread (for debugging under Linux). See Mysql Man-
ual section H.1 Debugging a MySQL server.
-O| --set-variable var=option
Give a variable a value. --help lists variables. You can find a
full description for all variables in the SHOW VARIABLES section
in this manual. See Mysql Manual section 7.28.4 SHOW VARIABLES.
The tuning server parameters section includes information of how
to optimize these. See Mysql Manual section 12.2.3 Tuning
Server Parameters.
-Sg|--skip-grant-tables
This option causes the server not to use the privilege system at
all. This gives everyone full access to all databases! (You can
tell a running server to start using the grant tables again by
executing mysqladmin flush-privileges or mysqladmin reload.)
--safe-mode
Skip some optimize stages. Implies --skip-delay-key-write.
--secure
IP numbers returned by the gethostbyname() system call are
checked to make sure they resolve back to the original hostname.
This makes it harder for someone on the outside to get access by
pretending to be another host. This option also adds some sanity
checks of hostnames. The option is turned off by default in
MySQL Version 3.21 because sometimes it takes a long time to
perform backward resolutions. MySQL Version 3.22 caches host-
names (unless --skip-host-cache is used) and has this option
enabled by default.
--skip-concurrent-insert
Turn off the ability to select and insert at the same time on
MyISAM tables. (This is only to be used if you think you have
found a bug in this feature).
--skip-delay-key-write
Ignore the delay_key_write option for all tables. See Mysql Man-
ual section 12.2.3 Tuning Server Parameters.
--skip-locking
Don't use system locking. To use isamchk or myisamchk you must
shut down the server. See Mysql Manual section 1.6 How Stable
Is MySQL?. Note that in MySQL Version 3.23 you can use REPAIR
and CHECK to repair/check MyISAM tables.
--skip-name-resolve
Hostnames are not resolved. All Host column values in the grant
tables must be IP numbers or localhost.
--skip-networking
Don't listen for TCP/IP connections at all. All interaction with
mysqld must be made via Unix sockets. This option is highly rec-
ommended for systems where only local requests are allowed. How-
ever, this option is unsuitable for systems that use
MIT-pthreads, because the MIT-pthreads package doesn't support
Unix sockets.
--skip-new
Don't use new, possible wrong routines. Implies
--skip-delay-key-write
--skip-host-cache
Never use host name cache for faster name-ip resolution, but
query DNS server on every connect instead.
--skip-show-database
Don't allow 'SHOW DATABASE' commands, unless the user has
process privilege.
--skip-thread-priority
Disable using thread priorities for faster response time.
--socket=path
Socket file to use for local connections instead of default
/tmp/mysql.sock.
-t|--tmpdir=path
Path for temporary files. It may be useful if your default /tmp
directory resides on a partition too small to hold temporary
tables.
-u|--user=user_name
Run mysqld daemon as user user_name. This option is mandatory
when starting mysqld as root.
-V|--version
Output version information and exit.
NOTE
SEE ALSO
isamchk(1), isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1),
mysqld_multi(1), mysqld_safe(1), mysqldump(1), mysql_fix_privi-
lege_tables(1), mysqlshow(1), mysql_zap(1), perror(1), replace(1)
For more information please refer to the MySQL reference manual, which
may already be installed locally and which is also available online at
http://www.mysql.com/doc/en/
BUGS
Please refer to http://bugs.mysql.com/ to report bugs.
AUTHOR
Ver 1.0, distribution 4.1.10a Michael (Monty) Widenius
(monty@mysql.com), MySQL AB (http://www.mysql.com/). This software
comes with no warranty. Manual page by L. (Kill-9) Pedersen
(kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer
(http://www.mercurmedia.com)
MySQL 4.1 19 December 2000 mysqld(1)
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