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Don Burleson Blog 







bind_aware hint tips

Oracle Database Tips by Donald BurlesonFebruary 12, 2013

Question:  I noticed a query using the bind_aware hint and I was hoping to get more information about the bind_aware hint and how it works.  Can you explain the bind_aware hint?

Answer:  The bind_aware hint is used with Oracle's adaptive cursor sharing facility.

select /*+ bind_aware */
   region = 'ATLANTA';

Starting in release and beyond, using the bind_aware hint forces bind-aware cursor_sharing from the first execution of the SQL statement.  By making the SQL statement bind aware, Oracle considers the bind variable value in determining whether to use the existing execution plan or generate a new execution plan.

Plan first for bind_aware

Oracle Corporation strongly recommends examining the existing child cursors in the library cache before using the bind_aware hint, largely because there is additional overhead associated with the bind_aware hint

  • Additional cursor memory required
  • Overhead of extra soft & hard parses
  • Extra child cursors

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