If you get the error "Too many connections" when you try to connect to MySQL, this means that there is already max_connections clients connected to the mysqld server.
If you need more connections than the default (100), then you should restart mysqld with a bigger value for the max_connections variable.
The maximum number of connects MySQL is depending on how good the thread library is 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.
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