摘要：
Linux 中直接 I/O 机制的介绍： https://www.ibm.com/developerworks/cn/linux/l-cn-directio/ 文件系统缓存，filesystem cache https://blog.csdn.net/shb_derek1/article/detai 阅读全文
摘要：
1）checkpoint相关参数 checkpoint_timeout (integer) Maximum time between automatic WAL checkpoints. If this value is specified without units, it is taken as 阅读全文