Do you need the rows to be checked for duplicates and remove duplicates?
If not replace UNION with UNION ALL.
Additionally you need indexes for both tables, depending on (additional)
WHERE Conditions.
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"
?Train people well enough so they can leave, treat them well enough so they
don't want to.? (Richard Branson)
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of a4g atl
Sent: Donnerstag, 28. Juni 2018 17:12
To: midrange-l@xxxxxxxxxxxx
Subject: Need advice on how to index UNIONed tables
I have a need to create UNIONed tables into a VIEW to give me access to data
in both libraries from a single SELECT.
The UNION is working but the response is very slow.
I created the unions very simply example:
Select * from lib1/file_a
UNION
Select * from Lib2/File_a
I will experiment adding the order by in the SELECT.
What is the best practice?
TIA
Darryl Freinkel
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