RE: "direct path read" and "db file sequential read" used for full table scans in 11g
From: Allen, Brandon <Brandon.Allen_at_OneNeck.com>
Date: Thu, 30 Aug 2012 21:09:24 +0000
Message-ID: <A250F0C68C23514CA9F3DF63D60EE10E1A825068_at_onews32>
I found the answer to question #3 - apparently it's a new feature called "In-Memory Parallel Execution" as documented at the links below. I'm still looking for answers on #1 and 2 though if anyone has any ideas. http://docs.oracle.com/cd/E11882_01/server.112/e25554/px.htm
Date: Thu, 30 Aug 2012 21:09:24 +0000
Message-ID: <A250F0C68C23514CA9F3DF63D60EE10E1A825068_at_onews32>
I found the answer to question #3 - apparently it's a new feature called "In-Memory Parallel Execution" as documented at the links below. I'm still looking for answers on #1 and 2 though if anyone has any ideas. http://docs.oracle.com/cd/E11882_01/server.112/e25554/px.htm
http://docs.oracle.com/cd/E11882_01/server.112/e25523/parallel002.htm
From: Allen, Brandon
- How can I force production to use the direct path reads?
- Why is it using "db file sequential read" for a full table scan instead of "db file scattered read"?
- I also tried setting PARALLEL to 2 on the table in question and it did force Oracle to use a parallel execution plan, but it still used "db file sequential read" instead of "direct path read" - any idea why this could be?
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