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MySql - Is it better to select from many tables with union or using temp tables? -
we have report users can run needs select records 5 different services. right not, using union combine tables in 1 query, sometimes, server , crashed! optimized bits , pieces of query (where's , table joins) , there haven't been crashes since, report still takes long time load (ie query slow).
the question is, mysql perform faster , more optimally if create 5 temp tables different service types, , select of temps? or there different idea? could, of course, use 5 separate selects , combine them in code (php). imagine cause report load slower...
any ideas?
usually limiting factor in speed database, not php. i'd suggest running seperate queries , let php combining, see if faster. if you're not storing data in arrays or doing other heavy processing, suspect php way faster.
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