Your problem is that you created a single index. An index is just a
presorted list of the data. The first column in the index is the most
relevant, being sorted by that column first. If you have an index on
State+County+Town, how would you quickly find a town? You can't if you
don't know the State or County, because the data is sorted first by
State, then by County, then by Town.
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, christopher.l.hood@stripped 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 ###
>
> Chris Hood
> Investigator Verizon Global Security Operations Center
> Email: <mailto:christopher.l.hood@stripped>
> christopher.l.hood@stripped
> Desk: 972.399.5900
>
> Verizon Proprietary
>
> NOTICE - This message and any attached files may contain information
> that is confidential and/or subject of legal privilege intended only
> for
> the use by the intended recipient. If you are not the intended
> recipient or the person responsible for delivering the message to the
> intended recipient, be advised that you have received this message in
> error and that any dissemination, copying or use of this message or
> attachment is strictly forbidden, as is the disclosure of the
> information therein. If you have received this message in error please
> notify the sender immediately and delete the message.
>
>
--
Brent Baisley
Systems Architect
Landover Associates, Inc.
Search & Advisory Services for Advanced Technology Environments
p: 212.759.6400/800.759.0577
