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What does a high gc current block busy event value indicate?
A. Access to cached data blocks was delayed because they were busy either in the remote or the local cache.
B. A large number of requested blocks were not cached in any instance.
C. Asynchronous input/output (I/O) is disabled.
D. Delay in processing has occurred in the GCS, caused by CPU saturation and would have to be solved by additional CPUs and load-balancing.
Correct Answer: A
Explanation/Reference:
Analyzing Performance Using GCS and GES Statistics
This section describes how to monitor GCS performance by identifying data blocks and objects which are frequently used (hot) by all instances. High concurrency on certain blocks may be identified by GCS wait events and times.
The gc current block busy wait event indicates that the access to cached data blocks was delayed because they were busy either in the remote or the local cache. This could be caused by any of the following:
The blocks were pinned
The blocks were held up by sessions
The blocks were delayed by a log write on a remote instance
A session on the same instance was already accessing a block which was in transition between instances and the current session needed to wait behind it (for example, gc current block busy)
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