SHOW [GLOBAL | SESSION] STATUS
    [LIKE 'pattern' | WHERE expr]

SHOW STATUS provides server status information. This information also can be obtained using the mysqladmin extended-status command. The LIKE clause, if present, indicates which variable names to match. The WHERE clause can be given to select rows using more general conditions, as discussed in Section 19.30, “Extensions to SHOW Statements”. This statement does not require any privilege. It requires only the ability to connect to the server.

Partial output is shown here. The list of names and values may be different for your server. The meaning of each variable is given in Section 5.1.7, “Server Status Variables”.

mysql> SHOW STATUS;
+--------------------------+------------+
| Variable_name            | Value      |
+--------------------------+------------+
| Aborted_clients          | 0          |
| Aborted_connects         | 0          |
| Bytes_received           | 155372598  |
| Bytes_sent               | 1176560426 |
| Connections              | 30023      |
| Created_tmp_disk_tables  | 0          |
| Created_tmp_tables       | 8340       |
| Created_tmp_files        | 60         |
...
| Open_tables              | 1          |
| Open_files               | 2          |
| Open_streams             | 0          |
| Opened_tables            | 44600      |
| Questions                | 2026873    |
...
| Table_locks_immediate    | 1920382    |
| Table_locks_waited       | 0          |
| Threads_cached           | 0          |
| Threads_created          | 30022      |
| Threads_connected        | 1          |
| Threads_running          | 1          |
| Uptime                   | 80380      |
+--------------------------+------------+

With a LIKE clause, the statement displays only rows for those variables with names that match the pattern:

mysql> SHOW STATUS LIKE 'Key%';
+--------------------+----------+
| Variable_name      | Value    |
+--------------------+----------+
| Key_blocks_used    | 14955    |
| Key_read_requests  | 96854827 |
| Key_reads          | 162040   |
| Key_write_requests | 7589728  |
| Key_writes         | 3813196  |
+--------------------+----------+

With the GLOBAL modifier, SHOW STATUS displays the status values for all connections to MySQL. With SESSION, it displays the status values for the current connection. If no modifier is present, the default is SESSION. LOCAL is a synonym for SESSION.

Some status variables have only a global value. For these, you get the same value for both GLOBAL and SESSION. The scope for each status variable is listed at Section 5.1.7, “Server Status Variables”.

Each invocation of the SHOW STATUS statement uses an internal temporary table and increments the global Created_tmp_tables value.

MySQL Enterprise.  Status variables provide valuable clues to the state of your servers. For expert interpretation of the information provided by status variables, subscribe to the MySQL Enterprise Monitor. For more information, see http://www.mysql.com/products/enterprise/advisors.html.