query to find top 5 wait events in oracle

Oracle - A query to get the "Wait Events" part of the AWR report. Solution for wait event " Read by other session" | orasolution Oracle-L: RE: Wait Event "PX Deq: Execution Msg" How to Check Patches Applied in Oracle Database; Top 10 Ways to Get Current Date and Time in Oracle DB; How to Enable/Disable a Scheduled Job in Oracle; TOP command is also useful for performance tuning. There is no wait event that accounts for using the CPU for processing. Oracle Real Application Clusters (Oracle RAC) is a clustered version of Oracle Database based on a comprehensive high-availability stack that can be used as the foundation of a database cloud system as well as a shared infrastructure, ensuring high availability, scalability, and agility for any application. Active Session History (ASH) was introduced in Oracle 10g. Important Statistics & Wait Events on Exadata - Uwe Hesse A table of common wait events is listed in Table 22-1. The most common wait events related to this are gc cr request and gc buffer busy. You need to query the database to extract the data requried for analysis. Oracle RAC Wait Events - SolarWinds Wait Event that occurs during a Smart Scan on an Index (on behalf of a Direct Index Fast Full Scan) We expect both to be among the Top Wait Events on a Data Warehouse Database, running on Exadata. You can see the current wait class waits by querying the v$system_wait_class view as seen in this example: S QL> Select wait_class, sum (time_waited), sum (time_waited)/sum (total_waits) 2 Sum_Waits 3 From v$system_wait_class see code depot for full script 4 Group by wait_class 5 Order by 3 desc; WAIT_CLASS SUM (time_waited) SUM_WAITS However, in Oracle 10.1 and higher this wait time is now broken out into the "read by other session" wait event. The main reason why this value is high is that the archives sent to the Standby side arrive late due to the network. Statistics Although wait events are great for helping with understanding the speed bumps the sessions experience, they do not show another important attribute of sessions: the use of resources such as CPU, I/O, and memory.

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