The maximum number of connections MySQL / cache settings

First, the maximum number of connections:

　　1 , view the current maximum number of database connections: SHOW the VARIABLES the LIKE '%% max_connections';

　　2, set the maximum number of connections to the database:

　　　　1) provided in the current session, after failure of restart of the database:

　　　　　　SET GLOBAL max_connections = 1000;

　　　　2 ) in the database configuration file my.ini located in, long-term effective:

　　　　　　max_connections=151

 　　　　　　

Second, the cache:

　　1 , open: in my.ini in [mysqld] was added the following:

　　　　query_cache_size = 32M

　　　　query_cache_type = 1

　　　　// set after the restart the service;

　　2 , the query cache is turned on:

　　　　SHOW VARIABLES LIKE '%query_cache%';

　　3 , the use of attention:

　　　　1) open the cache is repeated a second time inquiry, will speed up;

　　　　2) If the modified cache data corresponding to the new, causes the cache cleared;

　　　　3) Because the operation will clear the cache additions and deletions, additions and deletions resulting in slower operation;

　　　　4) it is mainly used for frequent queries, additions and deletions small database;