Query Hangs on Values that start with a number

Having a strange thing happen:
Have the following query:
SET NOCOUNT ON
DECLARE @.StartDate DateTime
DECLARE @.EndDate DateTime
SET @.StartDate = DateAdd(dd,-5,GetDate())
SET @.EndDate = GetDate()
SET NOCOUNT OFF
SET ROWCOUNT 0
SELECT SummaryDate = sd.SummaryDate, TagName = sd.TagName, Value = sd.Value, Duration = sd.Duration, EventTag = sd.EventTag
FROM v_SummaryData sd
INNER JOIN Tag ON Tag.TagName = sd.TagName
WHERE SummaryDate >= @.StartDate
AND SummaryDate <= @.EndDate
AND sd.TagName in ('20SWD','22SWD') AND CalcType = 'AVG' AND
Duration= '86400' ORDER BY SummaryDate, TagName
SET ROWCOUNT 0
If running this query, it hangs for about 9 minutes before returning a
value. If we comment out the INNER JOIN statement, works in 1 second.
Now, here's the really big twist. If we add in a tagname of 'TI74' as
a third tag, query runs right away!
It appears that if there is more then one tagname that starts with a
number, it will hang. As soon as a tagname is present that starts with
a letter, it works great.
We are at a loss as to what could be causing the issue. Have tried re-
indexing the Tag table, but still no resolve.
Running SQL Server 2000 SP3On Jun 12, 2:54 am, Mini67 <wor...@.gmail.com> wrote:
> Having a strange thing happen:
> Have the following query:
> SET NOCOUNT ON
> DECLARE @.StartDate DateTime
> DECLARE @.EndDate DateTime
> SET @.StartDate = DateAdd(dd,-5,GetDate())
> SET @.EndDate = GetDate()
> SET NOCOUNT OFF
> SET ROWCOUNT 0
> SELECT SummaryDate = sd.SummaryDate, TagName = sd.TagName, Value => sd.Value, Duration = sd.Duration, EventTag = sd.EventTag
> FROM v_SummaryData sd
> INNER JOIN Tag ON Tag.TagName = sd.TagName
> WHERE SummaryDate >= @.StartDate
> AND SummaryDate <= @.EndDate
> AND sd.TagName in ('20SWD','22SWD') AND CalcType = 'AVG' AND
> Duration= '86400' ORDER BY SummaryDate, TagName
> SET ROWCOUNT 0
> If running this query, it hangs for about 9 minutes before returning a
> value. If we comment out the INNER JOIN statement, works in 1 second.
> Now, here's the really big twist. If we add in a tagname of 'TI74' as
> a third tag, query runs right away!
> It appears that if there is more then one tagname that starts with a
> number, it will hang. As soon as a tagname is present that starts with
> a letter, it works great.
> We are at a loss as to what could be causing the issue. Have tried re-
> indexing the Tag table, but still no resolve.
> Running SQL Server 2000 SP3
Comments:
1. Why you are doing SET NOCOUNT OFF , SET ROWCOUNT 0
2. Is V_SummaryData View ? If so , table involved is index on
tagname ?
3. Try changing sd.TagName in ('20SWD','22SWD') to
Tag.TagName in ('20SWD','22SWD') and check
4. In the Where clause introduce the tablename , Instead of Duration='86400'
sd.Duration= '86400'