How to setup MySQL Query Cache

The query cache stores the text of a SELECT statement together with the corresponding result that was sent to the client. If an identical statement is received later, the server retrieves the results from the query cache rather than parsing and executing the statement again.

By default query cache size is 0, which is deactivated. To enable it, you can set the query_cache_size to 1000000.

mysql> SET GLOBAL query_cache_size = 1000000;
Query OK, 0 rows affected (0.04 sec) 

mysql> SHOW VARIABLES LIKE 'query_cache_size';
+------------------+--------+ 
|Variable_name     | Value  | 
+------------------+--------+ 
| query_cache_size | 999424 | 
+------------------+--------+ 
1 row in set (0.00 sec)