Expert remote DBA team of Dbametrix is offering high quality professional Oracle DBA support with strong response time to fulfill your SLA. Beginning Performance Tuning: Diagnose the Past - Oracle Two useful sections in Oracle's Database Performance Tuning Guide: Table of Wait Events and Potential Causes Important Statistics & Wait Events on Exadata - Uwe Hesse Your query says seconds in wait is 0. Wait events AWR,ASH Time model scripts - ORACLEAGENT BLOG Troubleshooting I/O Related Waits - Oracle If a session is not active it will not be sampled. Common Oracle Wait Events says: October 30, 2014 at 3:00 pm. As a troubleshooting example, I will explore a system spending 14.22% (a bit of an extreme case) of its DB time waiting on cursor: pin S wait on X. Oracle provides wait events that allow you to understand the total time a query spends in the database. In this system there are 119 Idle wait events, so all the rest would be classified as non-idle wait events. The top wait events identify the next places to investigate. The most common wait events related to this are gc cr request and gc buffer busy. There is nothing wrong with that; something has to be the Top Wait Event. SQL Top wait col c1 heading 'Average Waits for|Full scan Read I/O' format 9999.99 . Gouranga's Tech Blog: Oracle Wait Events and Solution The window can be also viewed by choosing the operator then clicking F4. The main reason why this value is high is that the archives sent to the Standby side arrive late due to the network. Tune gc current block 3-way wait event of Oracle RAC ... - dbametrix 3 ) One of my business operation takes 300ms (select + insert + update +select+ select etc . 1) you would use the memory advisors (part of enterprise manager) or use statspack itself. These expose session and query waits. alter system set cell_offload_processing = false; Tuning.

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