Database Tuning (MOSC)

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read by other session

edited Jun 28, 2017 5:00AM in Database Tuning (MOSC) 7 commentsAnswered

the application which accesses our database has been designed such that if the transaction does not complete within a certain period of time say 2 seconds it times out. We have been noticing such time outs intermittently during certain period for a while now, While investigating we found that the issue is due to blocking session with wait event "read by other session". The same object file#, block # is being accessed by both the sid's with one sid waiting on "read by other session" and times out after 20 seconds. The execution plan of the query is the same.

PCTFREE is set at default of 10% and based on the average row length calculation, the default of 10 is good for the objects in question. We see this pretty much on a daily basis around a similar time each day.

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