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SQL Optimizer for DB2 ZOS 5.5.1 - User Guide

Table of Contents

About SQL Optimizer Connections Connect to the Database SQL Optimization Workflow Create Support Bundles Join the SQL Optimizer Community Register SQL Optimizer 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 Animate Execution Plans

Generate Index Alternatives

About Generating Index Alternatives Test Run Index Alternatives Generate Index Alternatives

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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MIXSCAN

Scan a multiple-index.

MSJOIN

Use to perform a merge join.

NLJOIN

Use to perform a nested loop join.

This join is used to join tables and is represented by a NLJOIN node and right and left subtrees. The inner table is represented by the right subtree and the outer table by the left subtree. Use either a single-index scan, a multiple-index scan, or a table space scan to access both the inner and outer tables. You can also include another join operation with the left subtree.

PARTITION

Separate a single data stream into multiple data streams.

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