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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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new 6: START WITH id = 0 AND statement_id = 'newplan1' newplan SELECT STATEMENT HASH JOIN /* step 4 */ TABLE ACCESS FULL CUSTOMERS /* step 2 */ TABLE ACCESS BY INDEX ROWID ORDERS /* step 3 */ INDEX RANGE SCAN ORD_ORDER_DATE_IX /* step 1 */ Elapsed: 00:00:00.01 SQL> In step 1, the query first does an index range scan of the orders table using the ORD_ORDER_ DATE_IX index. Why an index range scan Because this index isn t unique it has multiple rows with the same data value the optimizer has to scan these multiple rows to get the data it s interested in. For example, if the indexed column is a primary key, it will be unique by definition, and you ll see the notation Unique Scan in the EXPLAIN PLAN statement. In step 2, the customers table is accessed through a full table scan, because account_ manager_id in that table, which is part of the WHERE clause, isn t indexed. In step 3, the query accesses the orders table by INDEX ROWID, using the ROWID it derived in the previous step. This step gets you the order_id, customer_id, and order_total columns from the orders table for the date specified. In step 4, the rows from the orders table are joined with the rows from the customers table based on the join condition WHERE o.customer_id=c.customer_id. As you can see from the preceding examples, the EXPLAIN PLAN facility provides you with a clear idea as to the access methods used by the optimizer. Of course, you can do this without having to run the query itself. Often, the EXPLAIN PLAN will provide you with a quick answer as to why your SQL may be performing poorly. The plan s output can help you determine how selective your indexes are and let you experiment with quick changes in code.
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Using Autotrace
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The Autotrace facility enables you to produce EXPLAIN PLANs automatically when you execute a SQL statement in SQL*Plus. You automatically have the privileges necessary to use the Autotrace facility when you log in as SYS or SYSTEM. First, if you plan to use Autotrace, you should create a plan table in your schema. Once you create this plan table, you can use it for all your future executions of the Autotrace facility. If you don t have this table in your schema, you ll get an error when you try to use the Autotrace facility, as shown here: SQL> SET AUTOTRACE ON SP2-0618: Cannot find the Session Identifier . Check PLUSTRACE role is enabled SP2-0611: Error enabling STATISTICS report SQL> You can create the PLAN_TABLE table by using the CREATE TABLE statement, as shown in Listing 19-5. You can also create this table by executing the utlxplan.sql script, as I explained earlier. Listing 19-5. Manually Creating the Plan Table SQL> 2 3 4 5 CREATE TABLE PLAN_TABLE( STATEMENT_ID VARCHAR2(30), REMARKS VARCHAR2(80), OPTIONS VARCHAR2(30), OBJECT_OWNER VARCHAR2(30), TIMESTAMP OPERATION OBJECT_NODE OBJECT_NAME DATE, VARCHAR2(30), VARCHAR2(128), VARCHAR2(30),
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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6 OBJECT_INSTANCE 7 OPTIMIZER 8 ID 9 POSITION 10 CARDINALITY 11 OTHER_TAG 12 PARTITION_STOP 13 OTHER Table created. SQL>
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NUMERIC, OBJECT_TYPE VARCHAR2(255),SEARCH_COLUMNS NUMERIC, PARENT_ID NUMERIC, COST NUMERIC, BYTES VARCHAR2(255),PARTITION_START VARCHAR2(255),PARTITION_ID LONG, DISTRIBUTION
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VARCHAR2(30), NUMBER, NUMERIC, NUMERIC, NUMERIC, VARCHAR2(255), NUMERIC, VARCHAR2(30));
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Next, the SYS or SYSTEM user needs to grant you the PLUSTRACE role, as shown here: SQL> GRANT PLUSTRACE TO salapati; * ERROR at Line 1: ORA-1919: role 'PLUSTRACE' does not exist. If, as in the preceding case, the PLUSTRACE role doesn t already exist in the database, the SYS user needs to run the plustrace.sql script, as shown in Listing 19-6, to create the PLUSTRACE role. Listing 19-6. Creating the PLUSTRACE Role SQL> @ORACLE_HOME/sqlplus/admin/plustrce.sql SQL> DROP ROLE plustrace; drop role plustrace * ERROR at line 1: ORA-01919: role 'PLUSTRACE' does not exist SQL> CREATE ROLE plustrace; Role created. SQL> SQL> GRANT SELECT ON v_$sesstat TO plustrace; Grant succeeded. SQL> GRANT SELECT ON v_$statname TO plustrace; Grant succeeded. SQL> GRANT SELECT ON v_$mystat TO plustrace; Grant succeeded. SQL> GRANT plustrace TO dba WITH ADMIN OPTION; Grant succeeded. SQL> Third, the user who intends to use Autotrace should be given the PLUSTRACE role, as shown here: SQL> GRANT plustrace TO salapati; Grant succeeded. SQL> The user can now set the Autotrace feature on and view the EXPLAIN PLAN for any query that is used in the session. The Autotrace feature can be turned on with different options: SET AUTOTRACE ON EXPLAIN: This generates the execution plan only and doesn t execute the query itself. SET AUTOTRACE ON STATISTICS: This shows only the execution statistics for the SQL statement. SET AUTOTRACE ON: This shows both the execution plan and the SQL statement execution statistics.
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