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SQL Optimizer for DB2 ZOS 5.6.2 - 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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WFSCAN

Welcome > SQL Operations > WFSCAN

Scan a work file.

A work file scan construct contains a WFSCAN node plus a work file node that is labeled WORKFILE.

WORKFILE

Welcome > SQL Operations > WORKFILE

Denotes a work file or temporary table that DB2 generates.

DB2 labels a work file node with the word WORKFILE or with specific name. Sort (for JOIN, UNION, DISTINCT, GROUP BY, or ORDER BY operations) is the most common operation for generating work files.

XIXAND

Welcome > SQL Operations > XIXAND

Denotes operation where DB2 returns intersection of two sorted DOCID lists. Output includes only DOCIDs in both lists.

XIXOR

Welcome > SQL Operations > XIXOR

Denotes operation for XML data where DB2 returns the union of two sorted DOCID lists.

The output includes any DOCID that exists in at least one of the DOCID lists and removes duplicate DOCIDs.

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