PostgreSQL完全刷缓存补丁
本文及其附件以PostgreSQL协议发布 曾经有朋友问过如何把缓存清空，没有这个功能，测试的时候非常不方便。 我做了一个补丁抛砖引
本文及其附件以PostgreSQL协议发布
曾经有朋友问过如何把缓存清空，没有这个功能，测试的时候非常不方便。
我做了一个补丁抛砖引玉，见附件。
提供两个SQL命令，尽量兼容Oracle：
1、ALTER SYSTEM CHECKPOINT;
这个其实就是将 CHECKPOINT 封装到一个新语法，没什么改动。
2、ALTER SYSTEM FLUSH SHARED_BUFFER / BUFFER_CACHE;
清空数据库缓存，将发生修改的数据刷到硬盘，脏块写出功能仍然是调用PG核心代码。
主要说明
1、语法是由Flex和Bison(Yacc)完成解析，请自行查阅它们的文档。
2、SYSTEM关键字由非保留改为保留
3、增加非保留关键字 FLUSH
4、SHARED_BUFFER 和 BUFFER_CACHE 并没有定义成关键字，而是用字符串比较
5、GANQI_VERSION是我自己定义的工程名，用的删掉或者在编译环境设定为1即可
6、仅经过简单测试，，我个人无法保证代码安全，请不要用在生产环境
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