Create indexes for Query Optimization

I am using ASP.net application on SQL server 2005.
I am getting data from the DB using this SQL statement from 2 tables:
Select Table1.a,Table1.b,Table2.C from Table1 INNER JOIN Table1 ON
Table2.e=Table.e Where Table1.a=XXX AND Table1.b>YYY Order Table1.a DESC
Table1 has around 2,000,000 Records and table has 3 records.
The query is running very slow.
How do Optimize the query using Indexes ?
On Which fields should I create the indexes ?
Thanks
ra294
ra294@.hotmail.comra294 wrote:
> I am using ASP.net application on SQL server 2005.
> I am getting data from the DB using this SQL statement from 2 tables:
> Select Table1.a,Table1.b,Table2.C from Table1 INNER JOIN Table1 ON
> Table2.e=Table.e Where Table1.a=XXX AND Table1.b>YYY Order Table1.a DESC
> Table1 has around 2,000,000 Records and table has 3 records.
> The query is running very slow.
> How do Optimize the query using Indexes ?
> On Which fields should I create the indexes ?
> Thanks
> ra294
> ra294@.hotmail.com
>
>
try using database engine tuning advisor, find it in tools menu of the
management studio|||Without looking at the data Im just guessing but try doing this:
Table1 index: Key columns: a,b,e
Table2 index: key columns: e included: c
MC
"ra294" <ra294@.hotmail.com> wrote in message
news:uTLstxSUIHA.5404@.TK2MSFTNGP03.phx.gbl...
>I am using ASP.net application on SQL server 2005.
> I am getting data from the DB using this SQL statement from 2 tables:
> Select Table1.a,Table1.b,Table2.C from Table1 INNER JOIN Table1 ON
> Table2.e=Table.e Where Table1.a=XXX AND Table1.b>YYY Order Table1.a DESC
> Table1 has around 2,000,000 Records and table has 3 records.
> The query is running very slow.
> How do Optimize the query using Indexes ?
> On Which fields should I create the indexes ?
> Thanks
> ra294
> ra294@.hotmail.com
>
>|||ra294,
You might want to recheck your posting. The query is not valid (because
of typos?), and the number of rows are suspect (really just 3 rows in
one table and 2 million rows in the other table?).
How many rows does the query return? 3? 6 million? How big is the table
with the 2 million rows (how many pages or how much MB)?
How slow is the query currently? 200 milliseconds, 5 seconds, 5 minutes?
In general, you should always define a Primary Key for each table. This
will automatically create a corresponding unique index. You should also
define any Foreign Key relations. In general, it is a good idea to index
Foreign Key relations.
If you would like more assistence, then please post simplified DDL (and
the answers to the questions above).
--
Gert-jan
ra294 wrote:
> I am using ASP.net application on SQL server 2005.
> I am getting data from the DB using this SQL statement from 2 tables:
> Select Table1.a,Table1.b,Table2.C from Table1 INNER JOIN Table1 ON
> Table2.e=Table.e Where Table1.a=XXX AND Table1.b>YYY Order Table1.a DESC
> Table1 has around 2,000,000 Records and table has 3 records.
> The query is running very slow.
> How do Optimize the query using Indexes ?
> On Which fields should I create the indexes ?
> Thanks
> ra294
> ra294@.hotmail.com|||On Jan 7, 6:56=A0pm, "ra294" <ra...@.hotmail.com> wrote:
> I am using ASP.net application on SQL server 2005.
> I am getting data from the DB using this SQL statement from 2 tables:
> Select Table1.a,Table1.b,Table2.C from Table1 INNER JOIN Table1 ON
> Table2.e=3DTable.e Where Table1.a=3DXXX AND Table1.b>YYY Order Table1.a DE=SC
> Table1 has around 2,000,000 Records and table has 3 records.
> The query is running very slow.
> How do Optimize the query using Indexes ?
> On Which fields should I create the indexes =A0?
> Thanks
> ra294
> ra...@.hotmail.com
Do you have index on either columns a or b? Also, you might consider
remove the order by clause and do it later.