(mysql.info.gz) SHOW VARIABLES

 
 13.5.4.19 `SHOW VARIABLES' Syntax
 .................................
 
      SHOW [GLOBAL | SESSION] VARIABLES [LIKE 'PATTERN']
 
 `SHOW VARIABLES' shows the values of some MySQL system variables.  This
 information also can be obtained using the `mysqladmin variables'
 command.
 
 The `GLOBAL' and `SESSION' options are new in MySQL 4.0.3.  With
 `GLOBAL', you will get the values that will be used for new connections
 to MySQL. With `SESSION', you will get the values that are in effect
 for the current connection. If you use neither option, the default
 `SESSION'. `LOCAL' is a synonym for `SESSION'.
 
 If the default values are unsuitable, you can set most of these
 variables using command-line options when `mysqld' starts or at runtime
 with the `SET' statement.  See  Server options and  `SET'
 SET OPTION.
 
 Partial output is shown here. The list of variables and their values
 may be different for your server. The meaning of each variable is given
 in  Server system variables.  Information about tuning them is
 provided in  Server parameters.
 
      mysql> SHOW VARIABLES;
      +---------------------------------+------------------------------+
      | Variable_name                   | Value                        |
      +---------------------------------+------------------------------|
      | back_log                        | 50                           |
      | basedir                         | /usr/local/mysql             |
      | bdb_cache_size                  | 8388572                      |
      | bdb_log_buffer_size             | 32768                        |
      | bdb_home                        | /usr/local/mysql             |
      ...
      | 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                         |
      ...
      | timezone                        | EEST                         |
      | tmp_table_size                  | 33554432                     |
      | tmpdir                          | /tmp/:/mnt/hd2/tmp/          |
      | version                         | 4.0.4-beta                   |
      | wait_timeout                    | 28800                        |
      +---------------------------------+------------------------------+
 
 With a `LIKE' clause, the statement displays only those variables that
 match the pattern:
 
      mysql> SHOW VARIABLES LIKE 'have%';
      +--------------------+----------+
      | Variable_name      | Value    |
      +--------------------+----------+
      | have_bdb           | YES      |
      | have_innodb        | YES      |
      | have_isam          | YES      |
      | have_raid          | NO       |
      | have_symlink       | DISABLED |
      | have_openssl       | YES      |
      | have_query_cache   | YES      |
      +--------------------+----------+
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