OT: How can we tune the search performance from the HTMLDB side?

This might be not an issue that can be solved by HTMLDB itself. However, I'd like to give a shot because our HTMLDB apps are 'killing' the server, according to our DBA. One app I made is querying a 50 million records table, so everytime the query is fairly slow. Is there any way to tune the performance? Our DBA suggests using other tools like Discoverer or Orable Form to do the work of HTMLDB.
Thanks for the inputs.
Luc

not OT.
as noted, you need to determine which SQL statements are the culprit (various ways, your DBA should be very happy to help)
but if you are using wizards that include a search field, you may be falling victim to some very inefficient SQL generated by HTML-DB/Apex, for instance (created by the application wizard for an application based on a table, creating a page with a report and a form):
select
"ID",
"OBJECT_OWNER",
"OBJECT_TYPE",
"OBJECT_NAME",
"TAB_COMMENTS",
"OBJECT_CREATED",
"OBJECT_MODIFIED",
"USAGE_NOTES",
"OBSOLETE_FLAG"
from "DEV_TAB_COMMENTS"
where
instr(upper("OBJECT_OWNER"),upper(nvl(:P1_REPORT_SEARCH,"OBJECT_OWNER"))) > 0 or
instr(upper("OBJECT_TYPE"),upper(nvl(:P1_REPORT_SEARCH,"OBJECT_TYPE"))) > 0 or
instr(upper("OBJECT_NAME"),upper(nvl(:P1_REPORT_SEARCH,"OBJECT_NAME"))) > 0 or
instr(upper("TAB_COMMENTS"),upper(nvl(:P1_REPORT_SEARCH,"TAB_COMMENTS"))) > 0 or
instr(upper("USAGE_NOTES"),upper(nvl(:P1_REPORT_SEARCH,"USAGE_NOTES"))) > 0 or
instr(upper("OBSOLETE_FLAG"),upper(nvl(:P1_REPORT_SEARCH,"OBSOLETE_FLAG"))) > 0
which will do a full table scan no matter what search criteria you enter, and cannot be fixed on the database side -- sometimes SQL can be fixed with the creation of function-based-indexes( FBI), that won't work here.
if your pages have such SQL, it needs to be rewritten to take advantage of indexes (FBI or otherwise)

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OT: How can we tune the search performance from the HTMLDB side?

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