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SQL Optimizer for DB2 ZOS 5.6.2 - User Guide

Table of Contents

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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CORSUB

Welcome > SQL Operations > CORSUB

Use a correlated subquery for access.

The CORSUB operation provides access by a correlated subquery.

DELCUR

Welcome > SQL Operations > DELCUR

Perform a DELETE WHERE CURRENT OF CURSOR operation.

DELETE

Welcome > SQL Operations > DELETE

Remove rows from a table or view.

A delete construct contains a DELETE node and one of the following: table space scan, single-index access, or multiple-index access.

DFETCH

Welcome > SQL Operations > DFETCH

Represents a direct fetch data using ROWID.

ROWID is used as a search condition. This is the most efficient was to access a base table if a ROWID-type column is defined within the table.

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