通过案例学调优之--动态视图（v$bh和x$bh)

通过案例学调优之--动态视图（v$bh和x$bh)v$bh与x$bhv$bh:非常详细地记录了数据块在数据缓冲区内的使用情况，一条记录对应一个block的详细记录。v$bh来自于基表x

13:07:20 SYS@ test1 >desc v$bh Name Null? Type ----------------------------------------------------------------- -------- -------------------------------------------- FILE# NUMBER BLOCK# NUMBER CLASS# NUMBER STATUS VARCHAR2(10) XNC NUMBER FORCED_READS NUMBER FORCED_WRITES NUMBER LOCK_ELEMENT_ADDR RAW(4) LOCK_ELEMENT_NAME NUMBER LOCK_ELEMENT_CLASS NUMBER DIRTY VARCHAR2(1) TEMP VARCHAR2(1) PING VARCHAR2(1) STALE VARCHAR2(1) DIRECT VARCHAR2(1) NEW CHAR(1) OBJD NUMBER TS# NUMBER LOBID NUMBER CACHEHINT NUMBER