Re: External table performance
Date: Fri, 12 Jan 2018 22:57:56 +0000 (UTC)
Message-ID: <436136621.2221433.1515797876858_at_mail.yahoo.com>
Kellyn
On Friday, January 12, 2018, 4:22:39 PM EST, Kellyn Pot'Vin-Gorman <dbakevlar_at_gmail.com> wrote:
Be aware, there is also a known bug in 12.1 with external tables causing performance issues.
Length
Mark
On Friday, January 12, 2018, 2:29:48 PM EST, Powell, Mark <mark.powell2_at_dxc.com> wrote:
Sanjay, you did not identify your Oracle version and edition nor post the actual code you have an issue with but consider the following.
I do not have access to a server where I can test right now but I believe that you can select from an external table using parallel query if you are on EE.
Mark PowellDatabase Administration(313) 592-5148
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> on behalf of Sanjay Mishra <dmarc-noreply_at_freelists.org>
Sent: Friday, January 12, 2018 2:23:40 PM
To: Oracle-L Freelists
thanks for the information. Do you have more details about the bug ?
Sanjay
On Fri, Jan 12, 2018 at 2:31 PM Sanjay Mishra <dmarc-noreply_at_freelists.org> wrote:
Oracle 12.1.2 and it is Single Node RAC instance and is Enterprise Edition. The issue with Select is where Clause for 2-3 column where Index can definitely be helpful but External table dont allow index. Select was Tried with Parallel but no difference in terms of performance. One option trying is MV and as data is not much but table is extensively used for various purpose.
Sanjay
Subject: External table performance Can someone share the Tuning activites that can be done for Selecting data from External table in 12c (12.1)? I am working on project that is getting every 6hourly data as flat file from external source and then has to be selected from ORacle table for some processing. Data is only 50K records but Select is taking time. It is Local Storage where File is located. I don;t think we can have indexes yet and so checking experience from the experts.
TxSanjay
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Received on Fri Jan 12 2018 - 23:57:56 CET
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