oracle内存锁,Oracle OCP之硬解析在共享池中获取内存锁的过程

(1)在父游标的名柄没有找到SQL语句的文本:select * from gyj_t1 where id=1;

2、释放library cache Latch

3、获得shared pool Latch

(1)搜索FreeList 空闲Chunk

(2)搜索LRU上可覆盖的chunk

(3)搜索R-FreeList 空闲Chunk

(4)如果没空间了,直接ORA-04031错误

4、释放shared pool Latch

5、 重新获取library cache Latch (oracle 11g:library cache mutex)

6、获取library cache lock Latch (oracle 11g:library cache mutex)

7、  释放library cache Latch(oracle 11g:library cache mutex)

8、获取library cache lock ----》保护父游标的名柄(SQL语句文本,父游标H0的地址)

9、释放library cache lock Latch

10、获取library cache Pin Latch

11、获取library cache Pin  --》保护父游标的H0(父游标的H0里面主要记录了子游标的名柄)

12、释放library cache Pin Latch  (oracle 11g:cursor mutex)

13、获取library cache lock Latch

14、获取library cache lock ----》保护子游标的名柄(子游标H0的地址)

15、释放library cache lock Latch

16、获取library cache Pin Latch

17、获取library cache Pin  --》保护子游标的H0(子游标的H0里面主要记录了环境,统计信息,绑定变量)

18、释放library cache Pin Latch

19、获取library cache Pin Latch

20、获取library cache Pin  --》保护子游标的H6(子游标的H6里面主要记录了执行计划)

21、释放library cache Pin Latch

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