Large String Parameters Causing Performance Issues

Hi All,
Bit of strange one this. I have a key field in one of my databases that is a
Char(18). I use this as a parameter field in one of my reports.
When I run the report and specify the key field parameter manually the
report runs instantly. If I attempt to set this as a parameter variable and
enter the criteria in the parameter box, the report takes over a minute to
run. The 2 statements are as follows.
1) select sum(sales_value) as sales from production.dbo.epos_transactions
where transaction_ref = '085505010500074995'
When run as above, the report runs instantly.
2) select sum(sales_value) as sales from production.dbo.epos_transactions
where transaction_ref = @.TREF
When I enter the parameter and run the report it takes over a minute to run.
Running the query through query analyser causes no issues on any of the
servers involved and the response time on all servers is instant.
I'd be grateful if anyone can shed any light on this.
Many thanks for any help.
--
Nick Colebourn
DBA
United Coop LtdHi Nick,
Could you supply a generic repro for this issue. An RDL for Northwind or a
simple DB. I would love to take a look at it.
| Thread-Topic: Large String Parameters Causing Performance Issues
| thread-index: AcUC1GzdZAw/tJ+RRciPnzP3TypLNA==| X-WBNR-Posting-Host: 213.146.135.115
| From: "=?Utf-8?B?TmljayBDb2xlYm91cm4=?="
<NickColebourn@.discussions.microsoft.com>
| Subject: Large String Parameters Causing Performance Issues
| Date: Tue, 25 Jan 2005 03:53:03 -0800
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|
| Hi All,
| Bit of strange one this. I have a key field in one of my databases that
is a
| Char(18). I use this as a parameter field in one of my reports.
| When I run the report and specify the key field parameter manually the
| report runs instantly. If I attempt to set this as a parameter variable
and
| enter the criteria in the parameter box, the report takes over a minute
to
| run. The 2 statements are as follows.
|
| 1) select sum(sales_value) as sales from production.dbo.epos_transactions
| where transaction_ref = '085505010500074995'
|
| When run as above, the report runs instantly.
|
| 2) select sum(sales_value) as sales from production.dbo.epos_transactions
| where transaction_ref = @.TREF
|
| When I enter the parameter and run the report it takes over a minute to
run.
|
| Running the query through query analyser causes no issues on any of the
| servers involved and the response time on all servers is instant.
|
| I'd be grateful if anyone can shed any light on this.
|
| Many thanks for any help.
|
| --
| Nick Colebourn
| DBA
| United Coop Ltd
||||Hi Brad,
Many thanks for your reply. I'll see if I can get it to do the same
with a northwind query and post back asap. For your info, I've created an
in-line table valued function containing the sql with the parameter and
called this as the dataset instead of the sql text itself. This works ok
either with static criteria or using a parameter passed across to the
function. The performance issue only seems to happen when you pass the
parameter value directly across to the sql text.
Many thanks
Nick
""Brad Syputa - MS"" wrote:
> Hi Nick,
> Could you supply a generic repro for this issue. An RDL for Northwind or a
> simple DB. I would love to take a look at it.
>
> --
> | Thread-Topic: Large String Parameters Causing Performance Issues
> | thread-index: AcUC1GzdZAw/tJ+RRciPnzP3TypLNA==> | X-WBNR-Posting-Host: 213.146.135.115
> | From: "=?Utf-8?B?TmljayBDb2xlYm91cm4=?="
> <NickColebourn@.discussions.microsoft.com>
> | Subject: Large String Parameters Causing Performance Issues
> | Date: Tue, 25 Jan 2005 03:53:03 -0800
> | Lines: 29
> | Message-ID: <EFE8F146-E9CC-49C8-A5B8-4E29E3F57EC2@.microsoft.com>
> | MIME-Version: 1.0
> | Content-Type: text/plain;
> | charset="Utf-8"
> | Content-Transfer-Encoding: 7bit
> | X-Newsreader: Microsoft CDO for Windows 2000
> | Content-Class: urn:content-classes:message
> | Importance: normal
> | Priority: normal
> | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.0
> | Newsgroups: microsoft.public.sqlserver.reportingsvcs
> | NNTP-Posting-Host: TK2MSFTNGXA03.phx.gbl 10.40.1.29
> | Path: cpmsftngxa10.phx.gbl!TK2MSFTNGXA03.phx.gbl
> | Xref: cpmsftngxa10.phx.gbl microsoft.public.sqlserver.reportingsvcs:40737
> | X-Tomcat-NG: microsoft.public.sqlserver.reportingsvcs
> |
> | Hi All,
> | Bit of strange one this. I have a key field in one of my databases that
> is a
> | Char(18). I use this as a parameter field in one of my reports.
> | When I run the report and specify the key field parameter manually the
> | report runs instantly. If I attempt to set this as a parameter variable
> and
> | enter the criteria in the parameter box, the report takes over a minute
> to
> | run. The 2 statements are as follows.
> |
> | 1) select sum(sales_value) as sales from production.dbo.epos_transactions
> | where transaction_ref = '085505010500074995'
> |
> | When run as above, the report runs instantly.
> |
> | 2) select sum(sales_value) as sales from production.dbo.epos_transactions
> | where transaction_ref = @.TREF
> |
> | When I enter the parameter and run the report it takes over a minute to
> run.
> |
> | Running the query through query analyser causes no issues on any of the
> | servers involved and the response time on all servers is instant.
> |
> | I'd be grateful if anyone can shed any light on this.
> |
> | Many thanks for any help.
> |
> | --
> | Nick Colebourn
> | DBA
> | United Coop Ltd
> |
>