(mysql.info) too-many-connections

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 A.2.6 `Too many connections'
 ----------------------------
 
 If you get a `Too many connections' error when you try to connect to
 the `mysqld' server, this means that all available connections are in
 use by other clients.
 
 The number of connections allowed is controlled by the
 `max_connections' system variable. Its default value is 100. If you
 need to support more connections, you should restart `mysqld' with a
 larger value for this variable.
 
 `mysqld' actually allows `max_connections+1' clients to connect. The
 extra connection is reserved for use by accounts that have the `SUPER'
 privilege. By granting the `SUPER' privilege to administrators and not
 to normal users (who should not need it), an administrator can connect
 to the server and use `SHOW PROCESSLIST' to diagnose problems even if
 the maximum number of unprivileged clients are connected. See 
 show-processlist.
 
 The maximum number of connections MySQL can support depends on the
 quality of the thread library on a given platform. Linux or Solaris
 should be able to support 500-1000 simultaneous connections, depending
 on how much RAM you have and what your clients are doing. Static Linux
 binaries provided by MySQL AB can support up to 4000 connections.
 

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