openedge - What would be the most efficient way of using 'BREAK BY' in a nested for each in Progress 4GL? -


assume there 4 tables grouph, groupl, member, incident. if write nested each below,

for each grouph use-index grouph-id     no-lock,     each groupl use-index groupl-id     groupl.grphid = grouph.grphid     no-lock,     each member use-index member-id     member.memberid = groupl.memberid     no-lock,     each incident use-index incident-key     incident.memberid = member.memberid     no-lock     break         member.memberid         member.schemid         member.emplid:      //do something.   end.

what facts can make query inefficient in relation 'break by' fields?

the biggest positive change can make rid of use-index phrases restricts db engine 1 index , prohibits index bracketing.

beyond that, if eachs least amount of data greatest amount of data, these fine.


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