Are there any ways to optimize UNION performance - in general or with an Oracle 8.17 backend?
I have 5 data sets that I need to merge via a UNION and the time to its to build each set individually is 9 secs but the time it takes to build the same set of data and union together into a single set is 33 seconds. The total set size is 1M of records with the largest set being unioned being about 750K. I've tried rearranging the position of the big data set in the union process, but this does not affect performance. Any tips or am I just seeing what's pretty much standard overhead for performing unions. Thanks, Malcolm _______________________________________________ Post Messages to: ProFox@leafe.com Subscription Maintenance: http://leafe.com/mailman/listinfo/profox OT-free version of this list: http://leafe.com/mailman/listinfo/profoxtech ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
