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Lawson on the Wait Facility

In this excellent article by Chris Lawson, author of the bestselling “The Art and Science of Oracle Performance Tuning”, we see " Null Events" brought into a new light:

Many DBAs are becoming familiar with the Oracle “Wait Event” facility. Using some special views, it is possible to find out what the database is waiting for. This has proven to be an excellent diagnostic tool; in fact, many DBAs begin their performance analysis by using the Wait Event views.

Lawson also relays:

there are some problems in Oracle 9i that makes this facility a little harder for DBAs to use. To see why, let’s review how the Wait facility is supposed to work.

Lawson also goes on to explain how the Wait Event works and further concludes:

Your preliminary identification of the Null Event as a disk-read can gain further confidence if different Null Events point to different blocks within the same database object.  In the case of the Scattered Read event, the P1 parameter will point to the file number, and the P2 parameter will indicate a different Block ID


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