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Possible Values same as setting the DFTDEGREE 20 Optimizer Profiles Example 6: INLIST to Nested Loop Join Change the list of values (inlist) to use the GENROW function which is more efficient and can improve query performance. 21 Optimizer Profiles Example 7: Sub-Query to Join By enabling the SUBQ2JOIN, a sub-query is transformed to a join during query rewrite. 22 Optimizer Profiles Example 8: Influencing Join Order Most of the time the join order of a query will greatly determine the query execution performance, as filtering rows early as possible is the most efficient. 23 Usefull Links Developer Work Article - Influence query optimization with optimization and statistical views in DB2 V9x DB2 V9.7 Info Center - Optimization Profiles and Quidelines 24 Optimizer Profiles QA 25.

Reina Email: aereinaca.ibm.com.

IBM Software Accelerated Value Program.

Reina Email: aereinaca.ibm.com IBM Software Accelerated Value Program The IBM Software Accelerated Value Program delivers a proactive, cost-reducing, and productivity enhancing advisory service.

The program pairs you with an assigned team who build a foundational understanding of your overall environment.

Through that understanding, the trusted partnet works to facilitate faster deployment, lifecycle leadership, risk mitigation, and more by identifying ways to improve your environment, staff skill set, and processes.

Optimizer Profiles Mechanism to alter default access plan Overrides the default access plan selected by the optimizer.

Can be employed without changing the application code Compose optimization profile, add to db, rebind targeted packages.

Should only be used after all other tuning options exhausted Query improvement, RUNSTATS, indexes, optimization class, db and dbm configs, etc.

Should not be employed to permanently mitigate the effect of inefficient queries.

Optimizer Profiles Anatomy of an optimizer profile: XML document Elements and attributes used to define optimization guidelines.

Profile Header (exactly one) Meta data and processing directives.

Global optimization guidelines (at most one) Applies to all statements for which profile is in effect.

Example: eligible MQTs guideline defining MQTs to be considered for routing.

Specifies directives for desired execution plan.

Optimizer Profiles Anatomy of an optimizer profile (continued): Profile Header Global optimization guidelines section.

Zero or more. 5 Optimizer Profiles Each statement profile contains a statement key (STMTKEY) and one or more statement-level optimization guidelines (OPTGUIDELINES).

The statement key identifies the statement or query to which the statement-level optimization guidelines apply.

Create the SYSTOOLS.OPTPROFILE table in the SYSTOOLS schema: Using the CREATE TABLE statement: CREATE TABLE SYSTOOLS.OPTPROFILE ( SCHEMA VARCHAR(128) NOT NULL, Schema name NAME VARCHAR(128) NOT NULL, Profile name PROFILE BLOB (2M) NOT NULL, Profile XML PRIMARY KEY ( SCHEMA, NAME )); Using the SYSINSTALLOBJECTS procedure: db2 call sysinstallobjects(optprofiles, c,, ) 2.

Compose optimization profile in XML file prof1.xml.

Optimizer Profiles How to create and use an optimizer profile (continued): 3.

Import prof1.del into SYSTOOLS.OPTPROFILE table as follows: IMPORT FROM prof1.del OF DEL MODIFIED BY LOBSINFILE INSERT INTO SYSTOOLS.OPTPROFILE; 5.

Enable the PROF1 profile for the current session: db2 set current optimization profile EXAMPLE.PROF1 9 Optimizer Profiles Checking if the guidelines are applied: SQL0437W reason code 13 is issued if there were problems with applying the guidelines (usually due to syntax error) Db2exfmt output contains a section with details on the problems encountered while attempting to apply the guidelines: Db2exfmt Profile Information section informs on which guidelines were used: 10 Optimizer Profiles Example 1 Examine the optimize profile in example1.xml: Global guideline forces OPTLEVEL 7 for all queries in the current session.

Statement guideline forces nested loop join method (NLJOIN) for tables MOVIE and TRANSACTIONDETAIL for a given query.

Run example1.bat this will create and apply an optimizer profile named PROF1.

It will also collect db2exfmt output before and after using the profile.

Compare the before and after.exfmt files how can you tell if the guidelines were applied 11 Optimizer Profiles Example1.xml 12 Optimizer Profiles Example1.sql Example1.del 13 Optimizer Profiles Example1.bat 14 Optimizer Profiles Example1-base.exfmt 15 Optimizer Profiles Example1-prof1.exfmt 16 Optimizer Profiles Example 2: Specify to always use a specific index Force the access plan to always use T1X index when accessing T1 table.

Optimizer Profiles Example 3: Use REOPT always Defer the query optimization until the input variables have been provided during runtime.

Possible Values ONCE, ALWAYS, or NONE 18 Optimizer Profiles Example 4: Change Optimization Level Change the optimization level for a particular sql.

Possible Values same as setting the DFTQUERYOPT 19 Optimizer Profiles Example 5: Runtime Degree setting Change the runtime degree of a query for INTRA-PARTITION environment.

Optimizer Profiles Example 7: Sub-Query to Join By enabling the SUBQ2JOIN, a sub-query is transformed to a join during query rewrite.

Optimizer Profiles Example 8: Influencing Join Order Most of the time the join order of a query will greatly determine the query execution performance, as filtering rows early as possible is the most efficient.

Usefull Links Developer Work Article - Influence query optimization with optimization and statistical views in DB2 V9x DB2 V9.7 Info Center - Optimization Profiles and Quidelines 24 Optimizer Profiles QA 25.

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