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Question 70/80
Which two statements are true concerning buffer states as shown in GV$BH.STATUS in Oracle 12c RAC?
Correct Answer: A,B
A: xcur is a RAM block that has been acquired in exclusive current mode. According the Oracle documentation, if a buffer state is exclusive current (XCUR), an instance owns the resource in exclusive mode.
B: cr mode indicates a "cloned" RAM block (a "stale" block), that was once in xcur mode.
The instance has shared access to the block and can only perform reads. The cr state means the owning instance can perform a consistent read of the block, if the instance holds an older version of the data.
References: http://www.dba-oracle.com/t_v$bh_status_free_buffer_blocks.htm
B: cr mode indicates a "cloned" RAM block (a "stale" block), that was once in xcur mode.
The instance has shared access to the block and can only perform reads. The cr state means the owning instance can perform a consistent read of the block, if the instance holds an older version of the data.
References: http://www.dba-oracle.com/t_v$bh_status_free_buffer_blocks.htm
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