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dbms_sqldiag_internal tips

Oracle Database Tips by Donald BurlesonApril 13, 2016

Question: What does the dbms_sqldiag_internal package do?  Can you show an example of using dbms_sqldiag_internal to change a SQL execution plan?

Answer:  To use the dbms_sqldiag_internal package allows you to create your own SQL patch to direct the SQL optimizer to use a set of hints when it optimizes a query. 

You can use dbms_sqldiag_internal.i_create_patch to insert hints into a query whose text you cannot edit.  This function lets you specify a query text and a set of hints to apply to the query. 

Oracle provide an undocumented package called dbms_sqldiag_internal., which gives you the ability to manually create a SQL patch for the purpose of adding hints to SQL from vendor applications, in cases where you are not able to modify the SQL.  This has the same functionality as optimizer plan stability. 

In this example, we intercept the SQL for the query "select * from bigtable;" in the library cache and apply a parallel hint to the query:


   sql_text => 'select * from bigtable,
   hint_text => 'parallel(bigtable,31)',
   name => 'big_table_parallel_sql_patch');

Also see dbms_sqldiag.

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