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Re: LIOs from 10g when using CPU_TEST.SQL

From: Norman Dunbar <norman.dunbar_at_environment-agency.gov.uk>
Date: 2006-01-10 16:06:16
Message-id: s3c3cd74.032@environment-agency.gov.uk

Hi Tim,

Norman Dunbar.
Contract Oracle DBA.
Rivers House, Leeds.

Internal : 7 28 2051
External : 0113 231 2051

>>> "Tim Onions" 01/10/06 02:42pm >>>

>> So what am I missing, why does 10g require less LIO? It clearly is
much
>> quicker whatever it is doing.

In addition to Connor's comments, Oracle 10g also has FAST DUAL access. This is where there are zero LIOs to access dual when you don't specify the actual contents of the row in DUAL.

SELECT * FROM DUAL or
SELECT DUMMY FROM DUAL will incurr LIO, but

SELECT SYSDATE FROM DUAL or
SELECT USER FROM DUAL etc

will have zero LIO.

Cheers,
Norman.

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Received on Tue Jan 10 2006 - 16:06:16 CST

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