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Oracle® Database Reference
11g Release 2 (11.2)

E40402-12
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DBA_HIST_INTERCONNECT_PINGS

DBA_HIST_INTERCONNECT_PINGS displays information about measured latency of interconnect messages (round-trip) from instance to instance. In Oracle Database 11g, the PING process assesses the latencies associated with communications for each pair of instances.

Every few seconds, the process in one instance (INSTANCE_NUMBER value) sends two messages to each instance (TARGET_INSTANCE value). One message has a size of 500 bytes and the other has a size of 8 KB. The message is received by the PING process on the target instance and is immediately acknowledged. The time for the round-trip is measured and collected.

Column Datatype NULL Description
SNAP_ID NUMBER NOT NULL Unique snapshot ID
DBID NUMBER NOT NULL Database ID for the snapshot
INSTANCE_NUMBER NUMBER NOT NULL Instance number for the snapshot
TARGET_INSTANCE NUMBER NOT NULL Target instance number
CNT_500B NUMBER   Number of pings of size 500 bytes from INSTANCE_NUMBER to TARGET_INSTANCE since the startup of the source instance (INSTANCE_NUMBER)
WAIT_500B NUMBER   Sum of round-trip times for messages of size 500 bytes from INSTANCE_NUMBER to TARGET_INSTANCE since the startup of the source instance (INSTANCE_NUMBER). Dividing by CNT_500B gives the average latency.
WAITSQ_500B NUMBER   Sum of squares (divided by 1000) of round-trip times for messages of size 500 bytes from INSTANCE_NUMBER to TARGET_INSTANCE since the startup of the source instance (INSTANCE_NUMBER). When used with CNT_500B and WAIT_500B, the standard deviation of the latency can be calculated.
CNT_8K NUMBER   Number of pings of size 8 KB from INSTANCE_NUMBER to TARGET_INSTANCE since the startup of the source instance (INSTANCE_NUMBER)
WAIT_8K NUMBER   Sum of round-trip times for messages of size 8 KB from INSTANCE_NUMBER to TARGET_INSTANCE since the startup of the source instance (INSTANCE_NUMBER). Dividing by CNT_8K gives the average latency.
WAITSQ_8K NUMBER   Sum of squares (divided by 1000) of round-trip times for messages of size 8 KB from INSTANCE_NUMBER to TARGET_INSTANCE since the startup of the source instance (INSTANCE_NUMBER). When used with CNT_8K and WAIT_8K, the standard deviation of the latency can be calculated.