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13.5.4.24 `SHOW VARIABLES' Syntax
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SHOW [GLOBAL | SESSION] VARIABLES [LIKE 'PATTERN']
`SHOW VARIABLES' shows the values of MySQL system variables. This
information also can be obtained using the `mysqladmin variables'
command.
With the `GLOBAL' modifier, `SHOW VARIABLES' displays the values that
are used for new connections to MySQL. With `SESSION', it displays the
values that are in effect for the current connection. If no modifier is
present, the default is `SESSION'. `LOCAL' is a synonym for `SESSION'.
If the default system variable values are unsuitable, you can set them
using command options when `mysqld' starts, and most can be changed at
runtime with the `SET' statement. See using-system-variables,
and set-option.
Partial output is shown here. The list of names and values may be
different for your server. server-system-variables, describes
the meaning of each variable, and server-parameters, provides
information about tuning them.
mysql> SHOW VARIABLES;
+---------------------------------+-------------------------------------+
| Variable_name | Value |
+---------------------------------+-------------------------------------+
| auto_increment_increment | 1 |
| auto_increment_offset | 1 |
| automatic_sp_privileges | ON |
| back_log | 50 |
| basedir | / |
| bdb_cache_size | 8388600 |
| bdb_home | /var/lib/mysql/ |
| bdb_log_buffer_size | 32768 |
...
| max_connections | 100 |
| max_connect_errors | 10 |
| max_delayed_threads | 20 |
| max_error_count | 64 |
| max_heap_table_size | 16777216 |
| max_join_size | 4294967295 |
| max_relay_log_size | 0 |
| max_sort_length | 1024 |
...
| time_zone | SYSTEM |
| timed_mutexes | OFF |
| tmp_table_size | 33554432 |
| tmpdir | |
| transaction_alloc_block_size | 8192 |
| transaction_prealloc_size | 4096 |
| tx_isolation | REPEATABLE-READ |
| updatable_views_with_limit | YES |
| version | 5.0.19-Max |
| version_comment | MySQL Community Edition - Max (GPL) |
| version_compile_machine | i686 |
| version_compile_os | pc-linux-gnu |
| wait_timeout | 28800 |
+---------------------------------+-------------------------------------+
With a `LIKE' clause, the statement displays only those variables that
match the pattern. To obtain a specific variable name, use a `LIKE'
clause as shown:
SHOW VARIABLES LIKE 'max_join_size';
SHOW SESSION VARIABLES LIKE 'max_join_size';
To get a list of variables whose name match a pattern, use the
‘`%'’ wildcard character in a `LIKE' clause:
SHOW VARIABLES LIKE '%size%';
SHOW GLOBAL VARIABLES LIKE '%size%';
Wildcard characters can be used in any position within the pattern to
be matched. Strictly speaking, because ‘`_'’ is a wildcard that
matches any single character, you should escape it as ‘`\_'’ to
match it literally. In practice, this is rarely necessary.
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