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Investigating High Latch Misses and Wait Times

Avatar photoCustomer October 8, 2019 at 11:56 pm

We have performance bottlenecks characterized by high latch misses and wait times. How can I analyze the latch statistics over a specified historical snapshot interval?

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    • Support October 10, 2019 at 11:50 am  

      You should use the DBA AWR Latch Summary report. This report provides a summary of latch statistics, including misses and wait times, for a specified AWR snapshot interval.

    • Avatar photoCustomer October 12, 2019 at 7:30 am  

      I need to see if the contention spikes occurred at specific times of the day. Is there a report that breaks down latch activity chronologically?

    • Support October 13, 2019 at 9:34 am  

      Yes, use the DBA AWR Latch by Time report. Each row in this report shows the system-wide latch contention wait time per latch name for one AWR snapshot interval, allowing you to identify high contention periods at specific times.

    • Avatar photoCustomer October 15, 2019 at 11:33 am  

      If the contention is specifically related to blocking sessions (e.g., buffer busy waits), which wait time metric in the SQL performance summary should I check?

    • Support October 15, 2019 at 4:35 pm  

      In the DBA AWR SQL Performance Summary report, examine the ‘Concurrency Wait Time’ column, which totals the elapsed time from wait event class ‘Concurrency’ like ‘buffer busy waits’.

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