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• To see the values that a server will use based on its compiled-in defaults, ignoring the settings in any
option files, use this command:
mysqld --no-defaults --verbose --help
• To see the current values used by a running server, use the
This section provides a description of each system variable. Variables with no version indicated are
present in all MySQL 5.0 releases. For historical information concerning their implementation, please
see http://www.mysql.com/products/enterprise//4.1/en/.
The following table lists all available system variables.
Table 5.2. System Variable Summary
Name
Cmd-Line
auto_increment_increment [1446]
Yes
auto_increment_offset [1449]
Yes
autocommit [436]
Yes
automatic_sp_privileges [437]
back_log [437]
Yes
basedir [401]
Yes
bdb_cache_size
[438]Yes
bdb-home [1309]
Yes
- Variable:
bdb_home
bdb-lock-
Yes
detect [1309]
- Variable:
bdb_lock_detect
bdb_log_buffer_size [438]
Yes
bdb-logdir [1309]
Yes
- Variable:
bdb_logdir
bdb_max_lock [439]
Yes
bdb-shared-
Yes
data [1310]
- Variable:
bdb_shared_data
bdb-tmpdir [1310]
Yes
- Variable:
bdb_tmpdir
big-tables [401]
Yes
- Variable:
big_tables
bind-address [401]
Yes
binlog_cache_size [440]
Yes
bulk_insert_buffer_size [441]
Yes
character_set_client [441]
character_set_connection [442]
Server System Variables
Option file
System Var
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
426
statement.
SHOW VARIABLES
Var Scope
Both
Both
Session
Global
Global
Global
Global
Global
Global
Global
Global
Global
Global
Global
Session
Global
Global
Both
Both
Both
Dynamic
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
No
Yes
Yes
Yes
Yes
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