RE: default optimizer_mode=ALL_ROWS in 10g windows
- From: "Jacques Kilchoer" <Jacques.Kilchoer@xxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 18 Aug 2004 18:42:02 -0700
In 9.2 the default for OPTIMIZER_MODE was CHOOSE. CHOOSE meant use the
rule-based optimizer if none of the tables in the query have statistics.
In Oracle 10.1 the Rule-based optimizer is officially "desupported" (see
metalink note notice 189702.1). So CHOOSE is no longer a valid option.
Therefore the default has been changed. Why is the default ALL_ROWS
instead of FIRST_ROWS_1, for example? That I don't know.
-----Original Message-----
jaysingh1@xxxxxxxxxxxxx
Does anybody have an idea why oracle made default
optimizer_mode=ALL_ROWS in 10g windows. I didn't check other platforms.
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