| Once again back with questions pls help [message #318125] |
Mon, 05 May 2008 17:03  |
aatishpatel
Messages: 4
Registered: March 2008
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Junior Member |
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hello oracle gurus please help me out with this querry:-
1) Write a query to find out which file has had the most physical read activity?
2) Write a SQL statement to change the retention time of your undo tablespace to 10 mins.
your help is appreciated
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| Re: Once again back with questions pls help [message #318132 is a reply to message #318125] |
Mon, 05 May 2008 18:20  |
rlockard
Messages: 19
Registered: April 2008
Location: Baltimore, MD
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Junior Member |
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| aatishpatel wrote on Mon, 05 May 2008 18:03 | hello oracle gurus please help me out with this querry:-
1) Write a query to find out which file has had the most physical read activity?
2) Write a SQL statement to change the retention time of your undo tablespace to 10 mins.
your help is appreciated
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This is sounding like homework questions. So, I'll point you in the correct direction; however I am not going to answer it for you.
For question #1 look at v$filemetric.
For question #2 I am going to assume you are using Automatic Undo Management. So in the init.ora file you need to set UNDO_MANAGEMENT=AUTO. Now because I believe this is homework, I will leave it up to you to find the second parameter that needs to be set. But because I'm a nice guy, I give you a hint it starts with UNDO.
But there is an issue with this you need to know. If you don't have the space then you will not be able to have your 10 minute retention unless you set the GUARANTEE option and you are using 10g or 11g.
-Rob
-Rob
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