at the DB level traffic prioritization


Hi all

Oracle version: 11g r2

operating system: hp - ux

business hours querires reports are running in production which degrades performance and consuming most of the resources, in fact user reports had a 4 open sessions
running queries with parallel processes, consuming resources DB intensively, and after having killed the session other users that connect to db was very good, in the future, how we can avoid this scenerio?

"what traffic prioritization" at the level of the DB, don't not cannibalizing the resources, to avoid this problem in the future

Enjoyed the entries

Prakash G R

PMP, how many sessions limit you to a user via the user profile is a management decision.  Users have a legitimate reason to have multiple connections to the database?  If not, then 2 1 or more likely would be a reasonable value, but it could be that many more is warranted.  How the application works such enters the recommendation that you give the direction.  If the user uses the default profile, then you will need to create another profile.  Other users can run the same query, while there might be users who should also be added in the new profile.

- -

Another factor to consider is how big a degree of parallelism was in use on each statement and how this degree has been assigned.  Parallelism should be used sparingly because it is easy for a negative impact on the entire database of spawning too many parallel session as you saw.  The default level of parallelism at the level of the table may be necessary to visit.  You haven't posted your database for the PQO feature setting.  This may also need adjustment.  This depends on how the PQO option is currently being implemented and controlled in your environment.

- -

The mentioned database resource manager feature managed via the dbms_resouce_manager may also be part of the solution.

- -

HTH - Mark D Powell.

Tags: Database

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