Select * taking a long time
Hello:
Performing a "SELECT * from my_TABLE" takes a looooong time...
What's the reason?
When you execute that SELECT, the first 50 rows normally appear in a few seconds...
I have ANALYZED the table, rebuilded all its indexes... The problem continues...
The first 50 rows are shown in aprox. 3 minutes!!!!
In another ORACLE environment this SELECT takes only a few seconds (the number of rows is similar)...
Must I analyze another tables?
Any ideas?
My ORACLE version is 10.2.0.4.0
pacoKAS wrote:
Hello:
Performing a "SELECT * from my_TABLE" takes a looooong time...
What's the reason?
When you execute that SELECT, the first 50 rows normally appear in a few seconds...Apart from posting the information shown in {message:id=9360003} as already indicated to you...
What tool are you running the query in?
When you talk about it returning the first 50 rows, this usually indicates that the tool you are using has run the query and is displaying the results as they are being retrieved. So the query itself has run in just a few seconds, but the time it is taking to retrieve that data and display it to you, especially when you want the next 50 rows etc. takes longer, and if you want all of the data then of course that will be longer still.
You can't judge the performance of a query just based on how long it takes to get the first 50 rows of it. You need to look at the explain plans and execution plans/traces to see what has happened and where the slowness of the query is. It could simply be that you don't have the appropriate statistics, or that there is just a lot of data and the interface is slow in displaying it.
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BHDCollections
SET ANSI_NULLS ON
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SET QUOTED_IDENTIFIER ON
GO
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GO
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SET ANSI_NULLS ON
GO
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GO
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[CollectionDetailid] [bigint] IDENTITY(1,1) NOT NULL,
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[BankFax] [varchar](25) NULL,
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TEMP_TABLE2 AS
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HAVING COUNT(DSLIPS)<>0;Without seeing an execution plan of the query it is hard to suggest something useful. Try insert the result of UNION ALL to the temporary table and then perform an aggregation on that table, not a CTE.
Just
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The version of BI discoverer is 10 and database also is 10g and the platform is win server 2003.
I have checked the forums and they talk about explain plan and tkprof and other commands, but my problem is that i am unable to find the query that discoverer is running i mean once the report is clicked the query runs and gives the estimate time it would take. can some one tell me where this query is stored so that i can check this query,
Also there were no changes made in the query or to the database.
The temp space fills up 100%, i increased the size of temp space but still it goes to 100% also i noticed that the CPU utilisation goes to 100%
i also increased the SGA but still no go.
can someone kindly help me as to what could be causing this problem
also kindly guide me to some good documents for tuning the discoverer.
thanks in advance,
regards,
Edited by: user10243788 on Jan 4, 2010 12:47 AMHi,
The fact that the report used to work fast and now not can be related to many things but my guess is that the database statistics were changed and so the explain plan has changed.
This can be done due to change in the volume of the data that crossed a level were oracle optimizer change the behavior but it can be other things as well.
Anyway it is not relevant since it will be easier to tune the SQL than to find what have changed.
In order to find whether the problem is with the discoverer or in the SQL extract the SQL as described above and run it in SQL tool (SQL Plus, TOAD, SQL Developer and so on).
The best way to get to the problem is run a trace on your session and then use the TKPROF command to translate it to a text file you can analyze - you can assist your DBA team they should have no problem doing that.
By doing that you will get the problematic statements/ functions/ procedures that the report uses.
From there you can start working on improving the performance.
Performance is expertise for itself so i'm sorry i don't know to tell you where to start from, I guess the start will be from understanding the meaning of the explain plan.
Hope I helped a little although I wish Ii had a magic answer for you
BTW, until you resolve that problem you can use the discoverer scheduler to run the reports in the background and so the users will get the data.
Tamir
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