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 Oracle DBMS_SQLPA
Oracle Tips by Burleson Consulting

Advanced Oracle Utilities: The Definitive Reference by Rampant TechPress is written by the top Oracle database experts (Bert Scalzo, Donald Burleson, and Steve Callan).  The following is an excerpt from the book.

A working example

Many ad-hoc examples found on Web sites, blogs, and other books tend to use the ALL_OBJECTS data dictionary view as a source for generating test data. Therefore, for the sake of consistency, so will this example.

 

As mentioned, the “tool” is the DBMS_SQLPA package. Its subprograms are shown below.

 

CANCEL_ANALYSIS_TASK

CREATE_ANALYSIS_TASK

DROP_ANALYSIS_TASK

EXECUTE_ANALYSIS_TASK

INTERRUPT_ANALYSIS_TASK

REPORT_ANALYSIS_TASK

RESET_ANALYSIS_TASK

RESUME_ANALYSIS_TASK

SET_ANALYSIS_TASK_PARAMETER

SET_ANALYSIS_DEFAULT_PARAMETER

 

The three analysis tasks of interest here are the create, execute and report subprograms. Use the SCOTT schema, create a replica of ALL_OBJECTS and populate the new table with a dump of SELECT * from ALL_OBJECTS. A relatively easy test case or “what if” scenario concerns adding an index to the new objects table. An index on what, though?

 

If using 11g out of the box, the SCOTT account must be unlocked and have the password reset. To get a feel for the amount of data, there are around 53,750 objects and 24 object types. Synonyms and Java classes account for just over 90%, so in terms of selectivity, the next most populous object (views) accounts for 3% and everything else is less than that. Object type seems like a good candidate for being indexed given that most of the queries are looking names of tables, views, packages, functions, procedures and triggers.

 

Use CTAS (Create Table As) to create the table and then gather table statistics using DBMS_STATS.GATHER_TABLE_STATS. For the SCOTT schema, one could also use GATHER_SCHEMA_STATS because it is a relatively small schema.

 

The target table, in keeping with examples elsewhere, is named MY_OBJECTS.

 

create table my_objects as select * from all_objects;

 

exec dbms_stats.gather_table_stats('scott','my_objects');

 

Execute a variety of SQL statements (all queries).

 

SELECT object_type, count(*) FROM my_objects

GROUP by object_type ORDER BY 2 desc;

SELECT object_name FROM my_objects

WHERE object_type = 'VIEW';

SELECT object_name FROM my_objects

WHERE object_type like 'PACKAGE%';

SELECT count(*) FROM my_objects

WHERE object_type NOT IN ('SYNONYMS','JAVA CLASS');

SELECT object_name FROM my_objects

WHERE object_type = 'EDITION';

 

Now create an SQL set using DBMS_TUNE.CREATE_SQLSET, load up a SQLSET cursor, and view what is in DBA_SQLSET_STATEMENTS.

 

The ADMINISTER SQL TUNING SET privilege will need to be granted to SCOTT beforehand.

set serveroutput on

EXEC DBMS_SQLTUNE.CREATE_SQLSET(sqlset_name => 'my_obj_sqlset');

 

DECLARE

  v_cursor  DBMS_SQLTUNE.SQLSET_CURSOR;

BEGIN

  OPEN v_cursor FOR

     SELECT VALUE(x)

     FROM TABLE(

       DBMS_SQLTUNE.SELECT_CURSOR_CACHE(

        basic_filter => 'sql_text LIKE ''%my_objects%''

        and parsing_schema_name = ''SCOTT''',

        attribute_list => 'ALL')) x;

                                              

  DBMS_SQLTUNE.LOAD_SQLSET

    (sqlset_name => 'my_obj_sqlset',

     populate_cursor => v_cursor);

END;

/

 

As confirmation that the tuning set is loaded, use the following query.

 

SQL> SELECT sql_text

  2  FROM dba_sqlset_statements

  3  WHERE sqlset_name = 'my_obj_sqlset';

 

SQL_TEXT

--------------------------------------------------

SELECT object_name FROM my_objects

WHERE object_type = 'VIEW'

 

SELECT object_name FROM my_objects

WHERE object_type = 'EDITION'

 

SELECT count(*) FROM my_objects

WHERE object_type NOT IN ('SYNONYMS','JAVA CLASS')

 

SELECT object_type, count(*) FROM my_objects

GROUP by object_type ORDER BY 2 desc

 

SELECT object_name FROM my_objects

WHERE object_type like 'PACKAGE%'

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Fo
r more details on Oracle utilities, see the book "Advanced Oracle Utilities" by Bert Scalzo, Donald K. Burleson, and Steve Callan.

You can buy it direct from the publisher for 30% off directly from Rampant TechPress.

 

 

 

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