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Is it possible to write Trigers on Data Dictionary Tables & Views? [message #525277]

Fri, 30 September 2011 10:01

bhavinjparmar
Messages: 8
Registered: September 2011
Location: London

Junior Member

Hi All!

Is it possible to create triger on the various tables and views exists (i.e. dynamic performance views) in data dictionary, when ever any DML operations performs by Oracle it self? If it is possible how and if not why it is not?

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Re: Is it possible to write Trigers on Data Dictionary Tables & Views? [message #525278 is a reply to message #525277]

Fri, 30 September 2011 10:04

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

please post reproducible test case.

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Re: Is it possible to write Trigers on Data Dictionary Tables & Views? [message #525279 is a reply to message #525278]

Fri, 30 September 2011 10:17

bhavinjparmar
Messages: 8
Registered: September 2011
Location: London

Junior Member

I have particular criteria for each case (i.e. Sessions, File States, Progress of Job and Tasks, Locks, Backup Status, Memory Usgae and Allocation, System and Session Parameters, SQL Executions). Is it possible to fire triggers, for example if Any memory segment is used 80% of allocated memory then it should fire.

I hope I am able to make it clear.

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Re: Is it possible to write Trigers on Data Dictionary Tables & Views? [message #525281 is a reply to message #525279]

Fri, 30 September 2011 10:23

Michel Cadot
Messages: 68641
Registered: March 2007
Location: Nanterre, France, http://...

Senior Member
Account Moderator

Quote:

Is it possible to create triger on the various tables and views exists (i.e. dynamic performance views) in data dictionary

No.

Quote:

for example if Any memory segment is used 80% of allocated memory then it should fire.

This is example is not a good one (or explain what you mean), anyway create a job that periodically checks what you want to check.

Regards
Michel

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Re: Is it possible to write Trigers on Data Dictionary Tables & Views? [message #525408 is a reply to message #525281]

Sun, 02 October 2011 11:07

Berny
Messages: 4
Registered: June 2009
Location: Munich

Junior Member

If your goal is to avoid excessive resource usage you should use better use one of the following:

Resource Parameters of User Profile
Database Resource Manager

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Re: Is it possible to write Trigers on Data Dictionary Tables & Views? [message #525710 is a reply to message #525408]

Tue, 04 October 2011 13:11

bhavinjparmar
Messages: 8
Registered: September 2011
Location: London

Junior Member

Hi!

I want to write a triger, when any new record is inserted to Outstanding alerts DBA_OUTSTANDING_ALERTS, i want to execute the trigger content. This is one of the example.

Regards,
Bhavin

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Re: Is it possible to write Trigers on Data Dictionary Tables & Views? [message #525718 is a reply to message #525710]

Tue, 04 October 2011 14:54

John Watson
Messages: 8929
Registered: January 2010
Location: Global Village

Senior Member

Hi - I can answer your last question regarding dba_outstanding_alerts. The alert system is based on advanced queueing: mmon raises alerts by enqueuing a message to the sys.alert_que queue. You need to write an alert handler which will subscribe to the queue and do something when a message arrives. The PL/SQL isn't that difficult, though you do need to understand advanced queueing. Read up on it, and have a go.

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