thnx my queries are running in 1/3rd the time now!! ritesh
On Mon, 2006-01-02 at 22:22, Dennis Cote wrote: > Ritesh Kapoor wrote: > > >Hi, > > > >I need to optimize/speed up my 'select' queries. The query creates > >about 3 to 6 left joins from 7 different tables depending on the > >different conditions passed. The problem is that this is taking a lot > >of time. > > > >The table column's are of both varchar and integer types - on which > >comparisions are done to collect the final data. Could you advise me on > >how to create indexes to speed up my queries. > > > >1. A little background on how indexes work - or a link containing info > >on this. > > > >2. Do I need to create an index on each column for each table or create > >an index for each table on all of its columns? > > > >3. Please note that the columns on which comparisions are done are of > >varchar type also so do indexes work on them as well? > > > >4. Any other suggestions which the experienced folks would have come > >across. > > > >Thanks and Regards, > >Ritesh Kapoor > >Atrenta Pvt. Ltd. > > > > > > > > > Check out these pages for information on optimizing SQLite queries. > > http://www.sqlite.org/php2004/page-001.html > http://www.sqlite.org/optoverview.html > http://www.sqlite.org/cvstrac/wiki?p=PerformanceTuning > http://www.sqlite.org/cvstrac/wiki?p=QueryPlans > http://www.sqlite.org/lang_explain.html > http://www.sqlite.org/lang_analyze.html > http://web.utk.edu/~jplyon/sqlite/SQLite_optimization_FAQ.html > > There is also an undocumented EXPLAIN QUERY PLAN command that can help > when optimizing complex queries. It work like the EXPLAIN command, but > displays the order that tables are scanned, and which indexes are used. > > HTH > Dennis Cote
