You need to create a separate index for each column you are searching on. The only time you will create an single index containing multiple columns is if you will always be searching on the indexed fields in the order you declared them in your index (i.e. State+County).
On Jul 28, 2004, at 8:25 AM, [EMAIL PROTECTED] wrote:
Ok, I will be the first to say that I am learning about indexes, however
it is my understanding that if I have a database with MANY rows and I
wish my queries to be faster I should index my database. With that being
said, I have 2 tables in my database that are being queried with a
single query using a UNION these 2 tables combined are about 9 Million
records (yes I said million).
My query which is below takes about 1 minute to run, now some people would say that this isn't long, however when the 2 tables were sub 5 million it only took a matter of about 20 seconds to run, so I figure I need an index. So I have created an index called "Main" within both tables and added 6 columns to that index, most of the columns that are used in my query.
Sorry for the long background, but here is the problem, my query DID NOT
speed up at all. It still takes right at 1 minute per query, so indexing
didn't buy me anything as far as I can tell.
Can someone tell me how the indexes are supposed to be done ( to ensure that I did it correctly) and tell me if they think that it should have sped up or if there is a more efficient way to do my query.
###QUERY HERE ###
Select ALL PRTC_DIALUP.Id, PRTC_DIALUP.Date, PRTC_DIALUP.Time, PRTC_DIALUP.Record_Type, PRTC_DIALUP.Full_Name, PRTC_DIALUP.Framed_IP_Address from PRTC_DIALUP Where PRTC_DIALUP.Framed_IP_Address = 'someipaddress' AND (PRTC_DIALUP.Date = 'one-date-here' OR PRTC_DIALUP.Date = 'one-day-earlier' OR PRTC_DIALUP.Date = 'one-day-later') UNION Select ALL PRTC_DSL.Id, PRTC_DSL.Date, PRTC_DSL.Time, PRTC_DSL.Record_Type, PRTC_DSL.Full_Name, PRTC_DSL.Framed_IP_Address from PRTC_DSL Where PRTC_DSL.Framed_IP_Address = 'someipaddress' and (PRTC_DSL.Date = 'one-date-here' OR PRTC_DSL.Date = 'one-day-earlier' OR PRTC_DSL.Date = 'one-day-later') order by Full_Name, Time;
### END QUERY ###
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