mysqld_safe是服务端工具，用于启动mysqld，它是mysqld的守护进程。因为mysqld_safe是mysqld的守护进程，所以mysqld_safe脚本会在启动MySQL服务器后继续监控其运行情况，并在服务器死机时重新启动。
mysqld_safe是服务端工具，用于启动mysqld；并且是mysqld的守护进程。
因为mysqld_safe是mysqld的守护进程，所以mysqld_safe脚本会在启动MySQL服务器后继续监控其运行情况，并在其死机时重新启动它。
用mysqld_safe脚本来启动MySQL服务器的做法在BSD风格的unix系统上很常见，非BSD风格的UNIX系统中的 mysql.server脚本其实也是调用mysqld_safe脚本去启动MySQL服务器的。
它通常做如下事情：
1. 检查系统和选项。
2. 检查MyISAM表。
3. 保持MySQL服务器窗口。
4. 启动并监视mysqld，如果因错误终止则重启。
5. 将mysqld的错误消息发送到数据目录中的host_name.err 文件。
6. 将mysqld_safe的屏幕输出发送到数据目录中的host_name.safe文件。
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