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I have a filePROD with 10 million rows, and a fileFIX with 100 rows (both files are identical columns).
I want to join the two files, and update filePROD with fields from fileFIX where the primary key matches.
Unfortunately SQL on v5r4 reads thru the entire 10 million records to locate the 100 to join on.
Is it possible to convince SQL to read sequentially thru the tiny fileFIX with 100 records (instead of the giant file)?
The following SQL ran for an hour - if I could force it to read the fileFIX first, it should only take seconds.
Any ideas?
Thanks in advance!
select * from filePROD
where exists
(select docid from fileFIX
where filePROD.docid = .fileFIX.docid)
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