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SQL Optimization

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Hi All,

I am trying to improve a Domino application we have that pulls data from our iSeries via a DB2 connector using SQL. In an SQL statement it has the following select:

where FLDA = 'x' and (FLDB = 'y' or FLDC = 'y')

So I figured I would create a new Logical File over by DB2 Physical file for this access path. The original Logical was keyed by FLDA then FLDB with no reference to FLDC and I am assuming that this is not very efficient. So I thought I would CONCAT FLDB and FLDC into a new field in the Logical called FLDX and then key the logical such:


And use the following select statement:

where FLDA = 'x' and FLDX like '%y%'

So do anyone know if this will be more efficient or will the use of the "like" slow me down?

Or does any one else have any suggestions as to how I can achieve this?

Are there any good tools to monitor the performance of any given SQL statement over a DB2 connection?


Jul 7 '06 #1
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