Nope. The answer is b). In the FIRST_ROWS mode, optimizer prefers NL to all other
methos despite the price.
On 2004.01.06 13:44, Jay Wade wrote:
> Hello:
>
> I was looking through some OCP questions posted on the web and came across
> the one below.
> I believe the answer is (D), because the join type would be dependent on the
> number of rows within the table. Is this correct or does the OPTIMIZER_MODE
> set to FIRST_ROWS alter this behavior?
>
>
> The cost-based optimizer can choose between a nested loops join and a sort
> merge join operation. All tables are analyzed and the OPTIMIZER_MODE is set
> to FIRST_ROWS. Which execution plan will be the result?
>
> a. The sort-merge join.
>
> b. The nested loops join.
>
> c. This depends on some sort parameter values.
>
> d. This depends on the number of rows in each table.
>
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>
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--
Mladen Gogala
Oracle DBA
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Received on Tue Jan 06 2004 - 12:59:26 CST
