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set global max_connections = 1024;
并发连接不仅仅是硬件配置,和应用、操作系统都有关系
MYSQL HELP:
The number of connections allowed is controlled by the max_connections system variable. Its default value is 100. If you need to suppor t more connections, you should restart mysqld with a larger value for this variable.
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.