Buffer Modes:
Buffer State
- KCBMNEW : New buffer for exclusive access
- KCBMSHR : Current buffer for shared access
- KCBMEXL : Current buffer for exclusive access
- KCBMCR : CR buffer for shared access
- KCBMCRX : Variant of CR mode
- KCBMNULL : Used to keep a reference to the buffer
Buffer State
- KCBBHFREE : buffer free
- KCBBHEXLCUR : buffer current
- KCBBHSHRCUR : buffer current
- KCBBHCR : buffer consistent read
- KCBBHREADING : being read
- KCBBHMRECOVERY : media recovery
- KCBBHIRECOVERY : crash or instance recovery
- KCBBHWRITING : write clone
- KCBBHPI : past image
- KCBBHMEMORY : allocated memory buffer
- KCBBHMWRITING : media recovery write clone
- KCBBHDONATED : donated to another memory component
- KCBCDATA : DB blocks
- KCBCSORT : sort blocks
- KCBCSVUN : save undo blocks
- KCBCSEGH : segment header blocks
- KCBCSVSH : save undo segment hdrs
- KCBCFRLS : free list blocks
- KCBCEMAP : extent map
- KCBCBMAP : bitmap block
- KCBCIMAP : bitmap index block
- KCBCBFSB : bitmapped file space bitmap
- KCBCBFSH : bitmapped file space header
- KCBCPW : prewarmed buffers class initially
本文转自maclean_007 51CTO博客，原文链接:http://blog.51cto.com/maclean/1277839
