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SQL Optimizer for DB2 ZOS 5.6.1 - User Guide

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About SQL Optimizer About Product Improvement Program Connections Connect to the Database SQL Optimization Workflow Create Support Bundles Join the SQL Optimizer Community Product Licensing Additional Resources SQL Operations

BTBSCAN CORSUB DELCUR DELETE DFETCH DIXSCAN EXCEPT EXCEPTA FETCH FFETCH FIXSCAN HBJOIN HSSCAN INLIST INSERT INTERSECT INTERSECTA IXAND IXOR IXSCAN MERGE MERGESTMT MIXSCAN MSJOIN NLJOIN PARTITION PIXSCAN PRUNED QB RETURN REPARTITION RGLIST RIDFETCH SELUPD SEMIJOIN SIXSCAN SORT SORTRID STARJOIN TBSCAN TRUNCATE UNION UNIONA UPDATE UPDCUR WFSCAN WORKFILE XIXAND XIXOR XIXSCAN

About Optimizing SQL Create Optimize SQL Sessions Open Optimizer SQL Sessions Optimize SQL Statements Specify Session Test Run Criteria Automatically Optimize SQL Statements Execution Plan

About Execution Plans Review Execution Plans Get Execution Plans Fill Missing Execution Plans Copy Execution Plans Generate Execution Plan Alternatives Compare Execution Plan Alternatives Execute Execution Plan Alternatives Retrieve Run Results Deploy Plan Guides Animate Execution Plans

Generate Index Alternatives

About Generating Index Alternatives Test Run Index Alternatives Generate Index Alternatives Delete Remaining Indexes

Test Run SQL Alternatives Retrieve Run Results Create User Defined Alternatives Set Bind Variables Review Alternatives Alternative SQL Text View Optimization Details View Schema Information View Bind Variables Show or Hide Table Attributes Show or Hide Column Attributes Compare SQL Statements Generate Optimize SQL Resolution Report Troubleshoot Optimization Results

Execution Plan Options Directory Setup Options Appearance Options

Intelligence Options Optimization Options SQL Options Quota Options

Index Generation

Index Options Intelligence Options (Index Generation)

Test Run Options Execution Method Options Order and Termination Options Best Alternative Criteria Options

Tutorial: SQL Optimizer

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UNION

Welcome > SQL Operations > UNION

Combine rows from multiple tables and remove duplicate rows.

A UNION construct contains a UNION node and at least one subtree. Each subtree contains a WFSCAN node, a WORKFILE node, a SORT node, and the source query block node.

UNIONA

Welcome > SQL Operations > UNIONA

Combine rows from multiple tables and retain duplicate rows.

An UNION ALL construct contains a UNIONA node and at least one subtree. Subtrees denote any source query blocks.

UPDATE

Welcome > SQL Operations > UPDATE

Modify rows in a table.

An update construct contains one UPDATE node and one of the following: single-index access, multiple-index access construct, or table space scan.

UPDCUR

Welcome > SQL Operations > UPDCUR

Represents UPDATE WHERE CURRENT OF CURSOR value.

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