Hard analysis of the same statement

Simple example:

SQL > select * from table_1 where col_1 =: b;  -can also use literal here

Use "INDEX RANGE SCAN.

SQL > alter session set OPTIMIZER_INDEX_COST_ADJ = 1000;

Will cause the same instruction to use "TABLE ACCESS FULL".


Why the database generates new plan? When the same statement is still hard analyzed, assuming there is enough space in the shared pool and the statement is not 'Compatible with Bind?

Thank you.

The view V$ SQL_SHARED_CURSOR shows some of the causes as to why the optimizer will choose not not to share an existing child cursor.

Change OPTIMIZER_INDEX_COST_ADJ falls under the cover of OPTIMIZER_MISMATCH.

The question that arises is almost reversed from what you ask.

It is not so when the optimizer chooses to make a difficult analysis.

It's more when a cursor existing being/not reusable.

that is, you will get an analysis hard whenever there is no such thing as an existing child shareable cursor.

So, if you run the SQL statement in a session and lend an existing child cursor reuse does not exist, then you will get a difficult analysis.

Tags: Database

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