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on the execution plan it chooses for the statement. If, for example, the bind peeking dictates using an index, Oracle will continue to do so, even if later values would actually dictate a full scan instead. Since bind peeking actually leads to suboptimal execution plans in cases such as these, hard-coded variable values would be preferable to bind values. As the preceding discussion indicates, cursor sharing using bind variables may not always lead to the best (optimal) execution plans. Hard-coded values for variables may actually provide more optimal execution plans than using bind variables, especially when dealing with heavily skewed data. Oracle provides you the adaptive cursor sharing feature, which is an attempt to resolve the conflict between cursor sharing using bind variables and query optimization. Using adaptive cursor sharing, whenever the database estimates that it s cheaper to produce a new execution plan for a statement than reusing the same cursors, it ll do so, generating new child cursors for the statement. The database strives to minimize the number of child cursors to take advantage of cursor sharing. However, the database won t blindly try to reuse cursors.



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Two concepts the bind sensitivity of a cursor and a bind-aware cursor play a critical role in how adaptive cursor sharing works. If changing a bind variable s values leads to different execution plans, a cursor is called a bind-sensitive cursor. Whenever the database figures that it must create new execution plans because the bind values vary considerably, the variable is deeded bind sensitive. Once the database marks a cursor as bind sensitive, the cursor is termed bind aware.

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Here s an example that illustrates how adaptive cursor sharing works. Suppose you execute the following query several times in your database: SQL> select * from hr.employees where salary = :1 and department_id = :2; The SQL statement uses two bind variables, SALARY and DEPARTMENT_ID. During the very first execution of a new SQL statement, the database makes the cursor bind sensitive if it peeks at the bind values and computes the selectivity of the predicate. The database assigns each execution plan with a set of selectivity values such as (0.25, 0.0050), which indicates the selectivity range of the execution plan. If new bind variables fall within the selectivity range, the optimizer reuses the execution plan, and if not, it creates a new execution plan. The next step is to evaluate whether the cursor is a bind-aware cursor. After the first hard parse, the database performs soft parses for the subsequent executions and compares the execution statistics with the hard parse execution statistics. If the database decides that the cursor is bind aware, it uses bind-aware cursor matching when it executes the query again. If the new pair of bind values falls inside the selectivity range, the database reuses the plan; otherwise, it performs a hard parse, thus generating a new child cursor with a different plan. If the new execution produces a similar plan, the database merges the child cursors, which means that if the bind values are roughly the same, the statements will share the execution plan.

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The V$SQL view contains two columns, named IS_BIND_SENSITIVE and IS_BIND_AWARE, that help you monitor adaptive cursor sharing in the database The IS_BIND_SENSITIVE column lets you know whether a cursor is bind sensitive, and the IS_BIND_AWARE column shows whether the database has marked a cursor for bind-aware cursor sharing The following query, for example, tells you which SQL statements are binds sensitive or bind aware: SQL> SELECT sql_id, executions, is_bind_sensitive, is_bind_aware FROM v$sql; SQL_ID EXECUTIONS -----------------------57pfs5p8xc07w 21 1gfaj4z5hn1kf 4 1gfaj4z5hn1kf 4 .. 294 rows selected SQL> In this query, the IS_BIND_SENSITIVE column shows whether the database will generate different execution plans based on bind variable values Any cursor that shows an IS_BIND_SENSITIVE column value of Y is a candidate for an execution plan change.

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