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SQL Optimizer for Oracle 10.0 - User Guide

Welcome to SQL Optimizer
About SQL Optimizer SQL Optimization Workflow New in This Release Additional Resources Database Privileges Database Privileges Script Connect to the Database Windows Layout Customize Toolbars Keyboard Shortcuts Support Bundle Register SQL Optimizer Check for Updates SQL Operations
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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PARTITION LIST

 

Operation: PARTITION LIST

 

Option: EMPTY

PARTITION LIST EMPTY does not perform the operation on any partition in the table.

 

Option: OR

PARTITION LIST OR performs the operation on all table partitions in a disjunction.

 

Option: SUBQUERY

PARTITION LIST SUBQUERY performs the operation on all list table partitions based on a subquery.

 

  

 

 

PARTITION RANGE

 

Operation: PARTITION RANGE

 

Option: EMPTY

PARTITION RANGE EMPTY does not perform the operation on any partition in the table.

 

Option: OR

PARTITION RANGE OR performs the operation on all range table partitions in a disjunction.

 

Option: SUBQUERY

PARTITION RANGE SUBQUERY performs the operation on all table partitions based on a subquery.

 

  

 

 

PROJECTION

Execution Plan image: image\projection.gif   

Row operation.

PROJECTION is used by the INTERSECTION, MINUS, and UNION operations to return a single set of records from the results of multiple queries.

Example

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 the MINUS operation is performed, the PROJECTION operation resolves the output into a single set of data for output to the user. PROJECTION is always used in conjunction with the MINUS, INTERSECTION, and UNION operations.

 

Related Topics

 

PX BLOCK ITERATOR

 

The PX BLOCK ITERATOR operation retrieves data from blocks after dividing the scan process between parallel scan slaves.

 

  

 

 

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