Oracle RAC Global Cache Lost Blocks Test
This test reports the number of blocks that were lost during transfer from one Oracle instance to another through private interconnects in this Oracle RAC.
This test is disabled by default. To enable the test, go to the enable / disable tests page using the menu sequence : Agents -> Tests -> Enable/Disable, pick the Oracle RAC as desired Component type, set Performance as the Test type, choose the test from the disabled tests list, and click on the >> button to move the test to the ENABLED TESTS list. Finally, click the Update button.
Target of the test : Oracle Cluster
Agent deploying the test : An internal agent
Outputs of the test : One set of results for every Oracle cluster.
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Measurement | Description | Measurement Unit | Interpretation |
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Block lost count: |
Indicates the number of blocks that were lost during transfer from one Oracle instance to another.
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Number |
Ideally the value of this measure should be zero. A high value is indicative of network problems. The use of an unreliable IPC protocol such as UDP may result in the value for global cache blocks lost being non-zero. This ratio should be as small as possible. Many times, a non-zero value for global cache blocks lost does not indicate a problem because Oracle will retry the block transfer operation until it is successful. |