Great explanation Rick. Short, not too involved but yet covers the topic nicely. Something everyone needs to review periodically.
Thanks, Susan On Wed, May 14, 2008 at 12:53 PM, Rick Cook <[EMAIL PROTECTED]> wrote: > ** The two things to look in determining the appropriate maximum number of > indexes for a form are the usage of the form and the number of rows > involved. If you have only a few hundred or thousand rows in a table, > indexes probably won't help all that much, and performance might be > negatively impacted if you went way over the top in your indexing. (Aside: > Remedy put like 16 on HPD:HelpDesk in ITSM 7. Draw whatever conclusions you > like from that). > > On tables with ~100k+ rows, the basic rule is that indexes speed up > queries, but slow down submits, because on each submit, every index must be > updated. So on forms where lots of records are submitted, you might want to > keep the number of indexes lower than on a form against which reports are > run. 7 indexes is not excessive, but is starting to get to the point where > adding more would probably be noticed on submits. There isn't a hard number > at which your performance will fall off a cliff, you will just notice > gradual degradation of performance as the number increases beyond somewhere > around 7. It's up to you to find the best balance of performance and > functionality for your installation. > > One other thing to look at, if you haven't already, is how the indexes you > have in place are being used, and whether changing or removing one or more > of those makes sense. That takes a lot of analysis of SQL logs, and working > with your DBA to determine which searches are taking the most time, etc. > > Rick > > > On Wed, May 14, 2008 at 10:35 AM, Tadeu Augusto Dutra Pinto < > [EMAIL PROTECTED]> wrote: > >> ** Hi all, >> >> I'd like to know if has a white paper that describes what's max number of >> index to a form... >> >> I've read a document from 2003 and I've noticed that more than 7 index (or >> 4 composite index) in one form is bad... >> >> >> I have an application that has a form with 8 index (some of them composite >> index) ... and we're having problems with performance (searches in >> database).. I'd like to know if it's possible to insert more index in this >> form! >> >> Remembering: I'd like to improve performance... >> >> >> Att, >> Tadeu Augusto Dutra Pinto >> __Platinum Sponsor: www.rmsportal.com ARSlist: "Where the Answers Are" >> html___ > > > __Platinum Sponsor: www.rmsportal.com ARSlist: "Where the Answers Are" > html___ > _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org Platinum Sponsor: www.rmsportal.com ARSlist: "Where the Answers Are"
