We all know ASH is an integral part of the Oracle Database self-management framework and is useful for diagnosing performance problems in Oracle RAC environments. The Top Cluster Events report lists events that account for the highest percentage of session activity in the cluster wait class event along with the instance number of the affected instances. AWR does not store data that is aggregated from across the entire cluster. Top 10 Foreground Events by Total Wait Time, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~, Event Waits Time Avg(ms) time Wait Class, ------------------------------ ------------ ---- ------- ------ ----------, DB CPU 20.1 29.9, gc cr multi block request 690,708 18.3 27 27.3 Cluster, gc cr grant 2-way 1,357,057 8315 6 12.4 Cluster, gc cr grant congested 78,942 5275 67 7.9 Cluster, db file sequential read 2,193,186 2698 1 4.0 User I/O, db file scattered read 850,137 2693 3 4.0 User I/O, external table write 707,925 2657 4 4.0 User I/O, gc current block congested 25,452 1690 66 2.5 Cluster, gc current block 2-way 185,282 1429 8 2.1 Cluster, cursor: pin S wait on X 2,090 1273 609 1.9 Concurrenc. Increase the PCT free for the table. The 10046 trace file shows lots of 'gc current block 2-way' waits but also a few 'gc cr failure' and 'cr request retry' waits. The message-oriented wait event statistics indicate that no block was received because it was not cached in any instance. An additional segment statistic, gc buffer busy, has been added to quickly determine the busy objects without having to query the V$SESSION_WAIT view mentioned earlier. Added on Apr 22 2009 Instead a global grant was given, enabling the requesting instance to read the block from disk or modify it. The oradebug command can be used to verify which network is being used for RAC traffic: This will dump a trace file to the location specified by the user_dump_dest Oracle parameter containing information about the network and protocols being used for the RAC interconnect. Fri, Feb 17, 2023 6:00 AM PST. Oracle How will I know which sessions are causing these wait events? FlashGrid Cloud Cluster for Oracle RAC is an engineered cloud system. Oracle 12c R1 RAC (Real Application Cluster) Oracle RAC Oracle Database ( Storage , Oracle Instance ( advertisements and self-proclaimed expertise. Oracle Database 12c R2: RAC Administration Ed 2 | ExitCertified Understanding the internals will help us understand it even These wait events are all very similar to the buffer busy wait events in a single-instance database and are often the result of: Hot Blocks multiple sessions may be requesting a block that is either not in buffer cache or is in an incompatible mode. What is the LMS CR slave timer event in top 5 events in oracle RAC configuration in 12c? The gc current block busy the database. When a node fails, the VIP associated with the failed node is automatically failed over to one of the other nodes in the cluster. 911RAC strive to update our BC Oracle support information. Save my name, email, and website in this browser for the next time I comment. TrainingOracle Your vendor-specific interconnect documentation for more information about adjusting IPC buffer sizes, Oracle Clusterware Administration and Deployment Guide for more information about enabling and using the OIFCFG and OCRDUMP utilities.
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oracle rac cluster wait events