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SQL Optimizer for Oracle 9.3.3 - User Guide

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ALL PARTITION ALTER INDEX AND EQUAL ANTI JOIN BITMAP AND BITMAP COMPACTION BITMAP CONSTRUCTION BITMAP CONVERSION BITMAP INDEX BITMAP JOIN INDEX UPDATE BITMAP JOIN INDEX UPDATE STATEMENT BITMAP KEY ITERATION BITMAP MERGE BITMAP MINUS BITMAP OR BUFFER SORT CARTESIAN JOIN COLLECTION ITERATOR CONCATENATION CONNECT BY CONNECT BY PUMP COUNT COUNT STOPKEY CREATE AS SELECT CUBE SCAN DDL STATEMENT DELETE DOMAIN INDEX FAST FULL INDEX SCAN FILTER FIRST ROWS FIXED INDEX FIXED TABLE FOR UPDATE FULL INDEX SCAN FULL INDEX SCAN DESCENDING FULL INDEX SCAN (MIN/MAX) HASH GROUP BY HASH GROUP BY PIVOT HASH JOIN HASH JOIN BUFFERED HASH PARTITION HASH UNIQUE INDEX INDEX BUILD NON UNIQUE INDEX RANGE SCAN INDEX RANGE SCAN DESCENDING INDEX RANGE SCAN (MIN/MAX) INDEX SAMPLE FAST FULL SCAN INDEX SKIP SCAN INDEX SKIP SCAN DESCENDING INDEX UNIQUE SCAN INLIST ITERATOR INLIST PARTITION INSERT INTERSECTION INTO INVALID PARTITION ITERATOR PARTITION LOAD AS SELECT MAT_VIEW ACCESS MAT_VIEW REWRITE ACCESS MERGE JOIN MINUS MULTI-TABLE INSERT NESTED LOOPS OUTER JOIN PARTITION PARTITION HASH EMPTY PARTITION LIST PARTITION RANGE PROJECTION PX BLOCK ITERATOR PX COORDINATOR PX ITERATOR PX PARTITION PX PARTITION HASH ALL PX PARTITION LIST ALL PX PARTITION RANGE ALL PX RECEIVE PX SEND RANGE PARTITION RECURSIVE EXECUTION RECURSIVE WITH PUMP REFERENCE MODEL REMOTE SELECT SEMI JOIN SEQUENCE SINGLE PARTITION SINGLE RANGE PARTITION SORT SORT AGGREGATE SORT GROUP BY SORT GROUP BY CUBE SORT GROUP BY NOSORT SORT GROUP BY ROLLUP SORT JOIN SORT ORDER BY SORT UNIQUE SQL MODEL TABLE ACCESS TABLE ACCESS BY GLOBAL INDEX ROWID TABLE ACCESS BY INDEX ROWID TABLE ACCESS BY LOCAL INDEX ROWID TABLE ACCESS BY ROWID TABLE ACCESS BY USER ROWID TABLE ACCESS CLUSTER TABLE ACCESS FULL TABLE ACCESS HASH TABLE ACCESS SAMPLE TABLE QUEUE TEMP TABLE GENERATION TEMP TABLE TRANSFORMATION UNION UNION ALL UNION ALL (RECURSIVE WITH) UNPIVOT UPDATE VIEW VIEW PUSHED PREDICATE WINDOW
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SORT JOIN

Execution Plan image: image\Plan_Sort_Join.gif  

Aggregation operation.

SORT JOIN sorts a set of records to use in a MERGE JOIN operation.

Example

The example from theMERGE JOIN topic is used again. All of the tables used in this example are fully indexed, so the following example deliberately disables the indexes by adding 0 to the numeric keys during the join, in order to force a merge join to occur.

select COMPANY.Name
from COMPANY, SALES
where COMPANY.Company_ID+0 = SALES.Company_ID+0
and SALES.Period_ID =3
and SALES.Sales_Total>1000;

Execution Plan

MERGE JOIN
SORT JOIN
TABLE ACCESS FULL SALES
SORT JOIN
TABLE ACCESS FULL COMPANY

Interpreting the Execution Plan

The Execution Plan shows that the COMPANY table and SALES table are accessed using TABLE ACCESS FULL operations. Before the records from those tables are passed to the MERGE JOIN operation, they are first processed by SORT JOIN operations that sort the records. The SORT JOIN output is used as input to the MERGE JOIN operation.

 

Related Topics

 

SORT ORDER BY

Execution Plan image: image\Plan_Sort_Order_By.gif   

Aggregation operation.

SORT ORDER BY sorts result sets without eliminating duplicate records.

Example

select Name
from COMPANY
order by Name;

Execution Plan

SORT ORDER BY
TABLE ACCESS FULL COMPANY

Interpreting the Execution Plan

The Execution Plan shows that after the query is resolved (by the TABLE ACCESS FULL operation), the records are passed to the SORT ORDER BY operation for ordering. The SORT ORDER BY operation orders the records by their Name values, and sends the output to the user.

Note: If the example had used the Company_ID column instead of the Name column, the optimizer would have used the COMPANY_PK index to perform the ordering.

 

Related Topics

 

SORT UNIQUE

Execution Plan image: image\Plan_Sort_Unique.gif   

Aggregation operation.

SORT UNIQUEsorts result sets and eliminates duplicate records prior to processing with the MINUS, INTERSECTION and UNION operations.

Example

A MINUS operation is used in this example, although the SORT UNIQUE operation is also shown in the INTERSECTION and UNION topics.

select Company_ID
from COMPANY
MINUS
select Company_ID
from COMPETITOR;

Execution Plan

PROJECTION
MINUS
SORT UNIQUE
TABLE ACCESS FULL COMPANY
SORT UNIQUE
TABLE ACCESS FULL COMPETITOR

Interpreting the Execution Plan

The Execution Plan shows that after each of the queries is separately resolved (by the TABLE ACCESS FULL operations), the records are passed to the SORT UNIQUE operation prior to being input into the MINUS operation. The SORT UNIQUE operation sorts the records and eliminates any duplicates, sends the records to the MINUS operation.

 

Related Topics

 

SQL MODEL

 

Operation: SQL MODEL

 

Option: ACYCLIC

The SQL MODEL ACYCLIC operation retrieves and organizes data into an AUTOMATIC ORDER SQL Model.

 

Option: ACYCLIC FAST

The SQL MODEL ACYCLIC FAST operation retrieves and organizes data into an AUTOMATIC ORDER SQL Model using the FAST method.

 

Option: ORDERED

The SQL MODEL ORDERED operation retrieves and organizes data into a SEQUENTIAL ORDER SQL Model.

 

Option: ORDERED FAST

The SQL MODEL ORDERED FAST operation retrieves and organizes data into a SEQUENTIAL ORDER SQL Model using the FAST method.

 

  

 

 

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