Which three statements are correct?

Examine the Exhibit.
Which three statements are correct?

A.
Global Cache Block Access Latency indicates how many block transfers incurred a delay
(busy) or an unexpected longer delay (congested).

B.
Global Cache Block Access Latency indicates how many block transfers received blocks
cached by other instances as well as blocks read from disk.

C.
Global Cache Block Transfer Rate shows the total aggregated number of blocks received by all
instances in the cluster over the interconnect.

D.
Global Cache Block Transfer Rate is essentially a profile of how much work is performed in the
local buffer cache, rather than the portion of remote references and physical reads, which both
have higher latencies.

E.
Global Cache Block Transfers and Physical Reads shows the percentage of read operations
that retrieved blocks from disk, and the buffer cache of other instances using Cache Fusion.

F.
Global Cache Block Transfers and Physical Reads shows the aggregated number of data
blocks received by all instances in the cluster over the interconnect.

Explanation:
Global Cache Block Access Latency
The global cache access latency represents the end-to-end elapsed time for a block request. The
request is timed from when the request is initiated until it completes. Cache transfer indicates how
many current and CR blocks per block class were received from remote instances, including how
many transfers incurred a delay (busy) or an unexpected longer delay (congested).
If accessing a database block of any class does not locate a buffered copy in the local cache, a
global cache operation is initiated. Before reading a block from disk, an attempt is made to find the
block in the buffer cache of another instance. If the block is present in another instance, a version
of the block may be shipped. Two different kinds of blocks are distinguished: current and
consistent read blocks. The average block receive time represents the end-to-end elapsed time or
latency for a block request.
Global Cache Block Transfer Rate
The global cache block transfer rate shows the total aggregated number of data blocks received
by all instances in the cluster by way of an interconnect. If a logical read fails to find a copy of the
buffer in the local cache, it attempts to find the buffer in the database cache of a remote instance.
If the block is present in another database, it is sent to the current instance.
Global Cache Block Transfers and Physical Reads
The chart represents the percentage of logical reads that read data from the buffer cache of other
instances via Direct Memory Access and from disk. It is essentially a profile of how much work is
performed in the local buffer cache, rather than the portion of non-local references that incur some
latency overhead.
Active Sessions for Cluster Wait Class
The chart represents the active sessions for the cluster wait class. You can view the top modules
and top SQL for a time period by selecting the time period in the active sessions chart.
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