DB2 Explain Training

8/7/2019 DB2 Explain Training

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(1) Create a PLAN_TABLE in the default database. Ensure that your userID owns the

object it creates , making it the SCHEMA . Here is the complete DDL .


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(2) Browse the newly created Plan_Table . It should be empty.

(3) Select a Table with data. The table T_NLTR_TRD is selected whose creator isNLD1DBO . This table has following indexes defined on it .

NLTRCU00

NLTRNN01NLTRNN02

NLTRCU00 has following columns in it .TRD_SYMB

TRD_DT

ACCT_NBRORD_NBR

ORIG_ID

NLTRNN01 has following columns in it .

TRD_STAT

NLTRNN02 has following columnsDAYOLD_IND


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(3) Create a SPUFI member for running dynamic EXPLAIN PLAN

EXPLAIN PLAN SET QUERYNO =1

FORSELECT * FROM NLD1DBO.T_NLTR_TRD

WHERE TRD_SYMB = ? AND

TRD_DT> ? ANDACCT_NBR = ? ;

This is a EXPLAIN PLAN with Page Range predicate . This means that any column after

the Page Predicate should not be matched in the search for the data for this SQL to

execute.

(4) To validate the PLAN table browse through the newly populated value in it . Or

run this SPUFI to test it .

SELECT ACCESSTYPE , MATCHCOLS, ACCESSNAME FROMA367123.PLAN_TABLE

WHERE QUERYNO=1 ;

The result is :

---------+---------+---------+---------+---------+---------+

ACCESSTYPE MATCHCOLS ACCESSNAME---------+---------+---------+---------+---------+---------+

I 2 NLTRCU00

DSNE610I NUMBER OF ROWS DISPLAYED IS 1

DB2 Explain Training

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