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CHAPTER 19 IM PR OVING DA TA BAS E PERFORM ANC E: S QL QUE RY OPTIMIZA TION
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The specific access and join methods used for each table mentioned in the SQL statement. The cost of each operation. Oracle creates the PLAN_TABLE as a global temporary table, so all the users in the database can use it to save their EXPLAIN PLAN output. However, you can create a local plan table in your own schema by running the utlxplan.sql script, which is located in the $ORACLE_HOME/rdbms/admin directory. The script, among other things, creates the plan table, where the output of the EXPLAIN PLAN utility is stored for your viewing. You are free to rename this table. Here s how you create the plan table so you can use the EXPLAIN PLAN feature: SQL> @$ORACLE_HOME/rdbms/admin/utlxplan.sql Table created. SQL>
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Creating the EXPLAIN PLAN
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To create an EXPLAIN PLAN for any SQL data manipulation language statement, you use a SQL statement similar to that shown in Listing 19-2. Listing 19-2. Creating the EXPLAIN PLAN SQL> EXPLAIN PLAN 2 SET statement_id = 'test1' 3 INTO plan_table 4 FOR select p.product_id,i.quantity_on_hand 5 FROM oe.inventories i, 6 oe.product_descriptions p, 7 oe.warehouses w 8 WHERE p.product_id=i.product_id 9 AND i.quantity_on_hand > 250 10 AND w.warehouse_id = i.warehouse_id; Explained. SQL>
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Producing the EXPLAIN PLAN
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You can t easily select the columns out of the PLAN_TABLE table because of the hierarchical nature of relationships among the columns. Listing 19-3 shows the code that you can use so the EXPLAIN PLAN output is printed in a form that s readable and shows clearly how the execution plan for the statement looks. Listing 19-3. Producing the EXPLAIN PLAN SQL> SELECT lpad(' ',level-1)||operation||' '||options||' '|| 2 object_name "Plan" 3 FROM plan_table 4 CONNECT BY prior id = parent_id 5 AND prior statement_id = statement_id 6 START WITH id = 0 AND statement_id = '&1' 7 ORDER BY id; Enter value for 1: test1 old 6: START WITH id = 0 AND statement_id = '&1' new 6: START WITH id = 0 AND statement_id = 'test1' Plan
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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-------------------------------------------------------SELECT STATEMENT HASH JOIN NESTED LOOPS TABLE ACCESS FULL INVENTORIES INDEX UNIQUE SCAN WAREHOUSES_PK INDEX FAST FULL SCAN PRD_DESC_PK 6 rows selected. SQL>
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Other Ways of Displaying the EXPLAIN PLAN Results
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You can also use the DBMS_XPLAN package to display the output of an EXPLAIN PLAN statement in an easily readable format. You use a table function from this package to display the EXPLAIN PLAN output. You use the DISPLAY table function of the DBMS_XPLAN package to display the output of your most recent EXPLAIN PLAN. You can use the table function DISPLAY_AWR to display the output of the SQL statement s execution plan from the AWR. Here s an example that shows how to use the DBMS_XPLAN package to produce the output of the most recent EXPLAIN PLAN statement. First, create the EXPLAIN PLAN for a SQL statement: SQL> EXPLAIN PLAN FOR 2 SELECT * FROM persons 3 WHERE PERSONS.last_name LIKE '%ALAPATI%' 4 AND created_date < sysdate -30; Explained. SQL> Make sure you set the proper line size and page size in SQL*Plus: SQL> SET LINESIZE 130 SQL> SET PAGESIZE 0 Display the EXPLAIN PLAN output: SQL> SELECT * FROM table (DBMS_XPLAN.DISPLAY); ----------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ----------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 37 | 3 (0) | 00:00:01 | |* 1 | TABLE ACCESS FULL| PERSONS | 1 | 37 | 3 (0) | 00:00:01 | ----------------------------------------------------------------------------Predicate Information (identified by operation id) : ______________________________________________ - filter ("ENAME" LIKE '%ALAPATI%' AND "CREATED_DATE">SYSDATE@!-30) 13 rows selected. SQL> If you wish, you can use the Oracle-provided utlxpls.sql script to get nicely formatted output. The utlxpls.sql script is an alternative to using the DBMS_XPLAN package directly, and it relies on the same package. The utlxpls.sql script is located in the $ORACLE_HOME/rdbms/admin directory, as I mentioned earlier, and uses the DBMS_XPLAN package to display the most recent EXPLAIN PLAN in the database. Of course, you must make sure that the table PLAN_TABLE exists before you can use the utlxpls.sql script. Here s how you d run this script:
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