Re: db file scattered read

If 14706+3 is one extent and another extent begins at 14710, it will NOT read 14706+8. A DB_FILE_MULTIBLOCK_READ will not span extents. Hemant

At 09:04 AM 14-03-03 -0800, you wrote:
>Here is a part of trace file . I am finding that oracle is trying to read
>8 or 3 or 7 blocks at a time . But block numbers are all sequential i.e.
>it will read 3 blocks starting from 14706 and then 8 blocks starting from
>14710 ( 14706+3 ). Why it doesn't read 8 blcoks always it multi_block_read
>is set to 8 ? Any Idea .
>Also what is ela=1 ,does it mean elapsed time is 1 sentisec ?
>
>
>
>WAIT #32: nam='db file scattered read' ela= 0 p1=4 p2=14706 p3=3
>WAIT #32: nam='db file scattered read' ela= 1 p1=4 p2=14710 p3=8
>WAIT #32: nam='db file scattered read' ela= 2 p1=4 p2=14718 p3=8
>WAIT #32: nam='db file scattered read' ela= 0 p1=4 p2=14727 p3=3
>WAIT #32: nam='db file scattered read' ela= 0 p1=4 p2=14731 p3=7
>WAIT #32: nam='db file scattered read' ela= 1 p1=4 p2=14739 p3=3
>WAIT #32: nam='db file scattered read' ela= 1 p1=4 p2=14744 p3=8
>WAIT #32: nam='db file scattered read' ela= 1 p1=4 p2=129784 p3=8
>
>
>Thanks
>-ak

Hemant K Chitale
My personal web site is : http://hkchital.tripod.com

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