RE: Why I get different 'db file scattered read' values?
- From: "Juan Carlos Reyes Pacheco" <jreyes@xxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 19 Jul 2004 14:45:17 -0400
Hi Chris, my block size is 8K, how do I get my stripe size in NT 2000?, I
don't use RAID
-------Original Message-------
From: oracle-l@xxxxxxxxxxxxx
Date: 07/19/04 13:44:54
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: Why I get different 'db file scattered read' values?
Stripe size?
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Juan Carlos Reyes
Pacheco
Sent: Monday, July 19, 2004 12:34 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Why I get different 'db file scattered read' values?
Hi list, I runt the following script to get the
DB_FILE_MULTIBLOCK_READ_COUNT value
=20
SQL> ALTER SESSION SET DB_FILE_MULTIBLOCK_READ_COUNT =3D100;
SQL> SET AUTOTRACE TRACEONLY
SQL> ALTER SESSION SET TRACEFILE_IDENTIFIER=3D'TEST_BLOCK_SIZE';
SQL> ALTER SESSION SET EVENTS '10046 TRACE NAME CONTEXT FOREVER, LEVEL
SQL> SELECT /*+ FULL(A) */ * FROM ADM.TRANSAC_ME A;
371196 filas seleccionadas.
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=3DCHOOSE (Cost=3D206 Card=3D308952 Byte
s=3D46342800)
=20
1 0 TABLE ACCESS (FULL) OF 'TRANSAC_ME' (Cost=3D206 Card=3D308952
Bytes=3D46342800)
Statistics
----------------------------------------------------------
1118 recursive calls
0 db block gets
33023 consistent gets
8490 physical reads
60 redo size
31569813 bytes sent via SQL*Net to client
272709 bytes received via SQL*Net from client
24748 SQL*Net roundtrips to/from client
6 sorts (memory)
0 sorts (disk)
=20
But I get the different values in p3
WAIT #1: nam=3D'db file scattered read' ela=3D 32568 p1=3D3 p2=3D51689 =
p3=3D8
WAIT #1: nam=3D'db file scattered read' ela=3D 15915 p1=3D3 p2=3D51778 =
p3=3D7
WAIT #1: nam=3D'db file scattered read' ela=3D 16483 p1=3D3 p2=3D51785 =
p3=3D8
WAIT #1: nam=3D'db file scattered read' ela=3D 29985 p1=3D3 p2=3D51937 =
p3=3D8
WAIT #1: nam=3D'db file scattered read' ela=3D 150 p1=3D3 p2=3D52050 =
p3=3D7
=20
Any idea?, my ntfs disk is compressed.
=20
Juan Carlos Reyes Pacheco
OCP
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