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Monitoring Database Object Usage in SGA Buffer Cache

Avatar photoCustomer December 13, 2019 at 1:06 pm

We need to identify which database objects (tables/indexes) are heavily utilizing the SGA buffer cache and potentially forcing other necessary objects out. Which report shows this usage by object?

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    • Support December 14, 2019 at 3:14 pm  

      Run the DBA SGA Buffer Cache Object Usage report. This report shows SGA buffer cache space usage broken down by object names in megabytes.

    • Avatar photoCustomer December 15, 2019 at 11:21 am  

      What is the key metric in that report that tells me if an object is entirely or mostly cached?

    • Support December 15, 2019 at 6:52 pm  

      Look at the ‘Object Percentage’ column. A value of 100% indicates that the object is completely resident in the buffer cache. This helps identify ‘hot’ objects and potential objects that should be pinned.

    • Avatar photoCustomer December 16, 2019 at 10:57 pm  

      If I notice an imbalance between our Shared Pool and Buffer Cache, where can I find the current split?

    • Support December 18, 2019 at 11:22 pm  

      The DBA SGA Memory Allocation report provides the current SGA memory usage in gigabytes, specifically showing the split between the buffer cache and the shared pool.

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