Re: Record selection when reading a big file

["Al Barsa, Jr." <barsa@xxxxxxx>]

At 09:14 PM 6/28/97, you wrote:
>I'm not used to big machines and big files.  The box has V3R2 and I think
>may be an ?F60? (its bigger than their development box, which they keep
>referring to as a 45).  
>
>The file I am concerned with has 5 million records.  I want to go through
>this file making selections based upon choices made for several fields. 
>Normally I would use the RPG cycle and bang down through the file (no K),
>making the selection tests with the most limiting choice first, and as
>soon as a record fails, goto end of cycle.  Any record that tumbled
>through that series of tests would be written to a workfile, with a key
>field made up with the sort-choices as made on the selection screen. Over
>90% of the time the final work file will hold less that 10,000 records.
>
>I've done this a lot on smaller files and smaller machines.  It offers a
>real easy front-end for the user and is flexible.  
>
>But I have never done this on a 5 million record file.  Am I about to make
>a fool of myself? -- 

Booth,

You have too much credibility on midrange-l to make a fool of yourself, here.

On the otherhand, subsetting the records in RPG will take a long time.

Try using ANYTHING else in the system.  My first choice would be OPNQRYF,
however you could be a logical with select/omit, or SQL.  Nevertheless, the
system query function will do a better job subsetting the records.

Al



Al Barsa, Jr.
Barsa Consulting, LLC
400 > 390

Phone:  914-251-9400
Fax:    914-251-9406

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