关于v$BH

关于v$bh的相关字段值
FILE# NUMBER Datafile identifier number (to find the filename, query DBA_DATA_FILES or VDBFILE) 
BLOCK# NUMBER Block number 
CLASS# NUMBER Class number 
STATUS VARCHAR2(6) Status of the buffer: 
free - Not currently in use

xcur - Exclusive

scur - Shared current

cr - Consistent read

read - Being read from disk

mrec - In media recovery mode

irec - In instance recovery mode

XNC NUMBER Number of PCM x to null lock conversions due to contention with another instance.

This column is obsolete and maintained for backward compatibility. 
LOCK_ELEMENT_ADDR RAW(4 | 8) Address of the lock element that contains the PCM lock that

is covering the buffer. If more

than one buffer has the same address, then these buffers are covered by the same PCM lock. 
LOCK_ELEMENT_NAME NUMBER The address of the lock element that contains the PCM lock that

is covering the buffer. If more than one buffer has the same address, then these buffers are

covered by the same PCM lock. 
LOCK_ELEMENT_CLASS NUMBER The address of the lock element that contains the PCM lock that

is covering the buffer. If more than one buffer has the same address, then these buffers are

covered by the same PCM lock. 
FORCED_READS NUMBER Number of times the block had to be reread from the cache because

another instance has forced it out of this instance's cache by requesting the lock on the block

in exclusive mode 
FORCED_WRITES NUMBER Number of times GCS had to write this block to cache because this

instance had used the block and another instance had requested the lock on the block in a

conflicting mode 
DIRTY VARCHAR2(1) Y - block modified 
TEMP VARCHAR2(1) Y - temporary block 
PING VARCHAR2(1) Y - block pinged 
STALE VARCHAR2(1) Y - block is stale 
DIRECT VARCHAR2(1) Y - direct block 
NEW VARCHAR2(1) Always set to N. This column is obsolete and maintained for backward compatibility. 
OBJD NUMBER Database object number of the block that the buffer represents 
TS# NUMBER Tablespace number of block

转载 http://hi.baidu.com/jdsnhan/item/d8c91b9f62fcd3de1f427124