Tuesday, March 20, 2012

Data read is so slow

I have a table with 3.5 million records and 50 columns. Users have been
complaining that they get ODBC errors when trying to run any query from MS
Access against this table. I created a view few fewer columns (about 25).
When I test it by doing select * from viewx in the query analyzer on my loca
l
machine it takes 14 minutes (slams my machine) to get back the whole dataset
.
What could be happening.
Comments Please.
Thank youBringing back 3.5 million rows will take time. Who could make use of such ma
ny rows.
Start by retrieving only the data you need, then tune the query by adding in
dexes etc to get better
execution times.
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://www.solidqualitylearning.com/
Blog: http://solidqualitylearning.com/blogs/tibor/
"helpplease" <helpplease@.discussions.microsoft.com> wrote in message
news:D1F44BC4-6478-4155-B9FF-5F6AF1A030E8@.microsoft.com...
>I have a table with 3.5 million records and 50 columns. Users have been
> complaining that they get ODBC errors when trying to run any query from MS
> Access against this table. I created a view few fewer columns (about 25).
> When I test it by doing select * from viewx in the query analyzer on my lo
cal
> machine it takes 14 minutes (slams my machine) to get back the whole datas
et.
> What could be happening.
> Comments Please.
> Thank you|||Do you have the WHERE clause in you SELECT ?
Please, post the execution plan for your query.
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Regards,
Rodrigo Fernandes
"helpplease" wrote:

> I have a table with 3.5 million records and 50 columns. Users have been
> complaining that they get ODBC errors when trying to run any query from MS
> Access against this table. I created a view few fewer columns (about 25).
> When I test it by doing select * from viewx in the query analyzer on my lo
cal
> machine it takes 14 minutes (slams my machine) to get back the whole datas
et.
> What could be happening.
> Comments Please.
> Thank you

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