Execution Time Anomaly In Stored Procedures In SQL Server 2005
Dec 3, 2006
Background: We have SQL Server 2005 x64 running on a quad-core (dual dual-core) machine with 16GB of RAM. The database is about 10GB in size and we execute around a million stored procedures a day on it. Our application uses about 1000 different stored procedures on this machine. The application is a transactional B2B web-app with about 2000 users.
The problem we have is a really odd one that I can't seem to find much information on. We have a small number (3-4) of stored procedures that's exibiting this problem.
The stored proc in question takes on average 100ms CPU time to execute. It's a fairly complex stored proc, about 300 lines long, 6-7 select statements and it uses temp tables. No updates / inserts except for on the temp tables. It's executed about 5000 times per day. About once a week, though, execution times will suddenly jump up to 3000 ms average. This happens randomly during the day, although it seems to happen more often on Monday mornings (the DB is mostly unutilized over the weekend)
To fix this, I force the DB to recalculate the execution plan by adding / removing (depending what I did last time around) the line 'set arithabort on' at the top of the stored procedure. I have no idea why this works, but it does. Within seconds of changing it, the stored proc execution time will go back to it's normal range of 60-150ms.
I've tried setting the execution plan of the stored procedure but I can't get it to work - the execution plan is very long and I don't know how to debug the error I get.
What is happening? This happens with a couple of stored procedures - usually the more complex ones. Has anyone seen anything like this?
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Oct 13, 2005
Dear group,is it possible in SQL-Server to see when a stored procedure wasexecuted ?I would say it is only possible with some traces but not with thestandard settings.For a short answer on that matter i'd be thankful.RegardsUli
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Oct 16, 2007
Hi ,
I ma using sql server 2005.I have a bunch of statements of sql and i have created a stored procedure for those. When i execute i found that there is lot's of difference between execution time of stored procedure and direct sql in query windows.
can anyone help me to optimize the execution time for stored prcedure even stored prcedure is very simple.
I have used sql server 2000 and i am new in sql server 2005.
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Jun 11, 2015
Is there a way to keep track in real time on how long a stored procedure is running for? So what I want to do is fire off a trace in a stored procedure if that stored procedure is running for over like 5 minutes.
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Jul 3, 2015
I have a stored proc that is executing in 2 sec on production and test database. It is taking more than a min on dev environment.
I have verified sqlserver version is same on both of the server.Prod is running on 2012Sp1 however dev don't have sp1. I am downloading it.
Both are 64bit, has same collation and compatibility level.I have confirmed that sp on both servers has same execution plan. I have reset and import stats from prod too.
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Apr 27, 2005
This is a solution for a very specific problem, and it's one that you'll hardly ever use, but it's important to know about that one scenario where it can save your neck. Ordinarily, stored procedures are only recompiled if they're no longer in the procedure cache. But if a stored procedure's execution plan is still in the cache, then SQL Server reuses the compiled storedprocedure and its existing execution plan. This is almost always the best course of action. Almost always, but not always.Sometimes, however, reusing an existing plan doesn't offer the most efficient performance. Imagine, for example, that your stored procedure accepts a parameter that determines the natureof a JOIN operation. The results can vary in a big way, so you wouldn't want your procedure to be locked into an execution plan that might be completely inappropriate for that JOIN. In a highlyspecialized case like this, you might want to force SQL Server to recompile the procedure every time the procedure runs. Doing so comes at a performance cost, but this might be offset by thesavings you gain in not executing the procedure with an awful compiled execution plan. Consider carefully whether to use this approach (or whether to re-engineer the over-design of yourapplication to avoid this situation in the first place). Should you need to instruct SQL Server to recompile each time, add the WITH RECOMPILE directive to the procedure, like this: CREATE PROCEDURE ProcName @Param int /* ... other parameters */ WITH RECOMPILE AS /* ... procedure code follows */
If we omit "WITH RECOMPILE", what will be the consequence? Thanks
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Oct 28, 2005
Hi,
I need advice on how to automate stored procedures within my SQL2003 DB.
I have a stored procedure I want to automate on 120 second cycle - to link to some external software.
I have little experiance of this and need some pointers on where to research or how to achieve my goal.
Many thanks,
J
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Jan 20, 2008
Hi,
I'm would like know if the analysis service data mining enables to detect anomalies from "normal" behavior/patterns of data (1), and alert about such anomalies when detected (2). both above sql server relational DB (3).
Thanks,
Eyal
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Apr 19, 2007
Hello
I have a .Net application which invokes an stored procedure (SQL Server 2005 Express installed on the same machine). When the stored procedure is called the first time, the application hangs because the sp never ends execution and the application's process has to be killed. But when the application is executed again, the sp runs as expected. What could be happening?
The stored procedure references remote tables by means of synonyms. If the Management Studio is used instead, the sp never ends execution when invoked the first time, but the query can be cancelled.
Now, if the sp is invoked first in the Management Studio first and then by the application, this does not hang (the sp executes as expected).
Thanks a lot.
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Aug 30, 2005
To set up the problem, paste this into QA:if exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[WorkOTRate]') and OBJECTPROPERTY(id, N'IsUserTable')= 1)drop table [dbo].[WorkOTRate]GOCREATE TABLE [dbo].[WorkOTRate] ([TimeFrom] [smalldatetime] NOT NULL ,[TimeTo] [smalldatetime] NOT NULL ,[RateMultiplier] [float] NOT NULL) ON [PRIMARY]GOINSERT INTO dbo.WorkOTRate (TimeFrom, TimeTo, RateMultiplier)VALUES ('18:00:00', '23:59:59', 1.2)SELECT TimeFrom, TimeTo, RateMultiplier FROM dbo.WorkOTRateThis gives the following result:1900-01-01 18:00:001900-01-02 00:00:001.2So, it's storing the time 23:59:59 as midnight. That's odd.(NOTE: If you rescript the table using datetime instead ofsmalldatetime types, the data are stored correctly.)It gets worse (or better, if you like perversity).If I go to Enterprise Manager, right-click on WorkOTRate and select"Open Table" -> "Return All Rows" I get:01/01/1900 18:00:0002/01/19001.2So, I bite the bullet and change the two column types to datetime,clear out the old data and run the INSERT again. The data looks betternow.Go back to the view in EM.If I put the cursor in a new row, and type into the TimeFrom column18:30:00 and the TimeTo column 19:30:00 and the RateMultiplier column1.3, and refresh the data by pressing the red shriek !, I get this:01/01/1900 18:00:0001/01/1900 23:59:591.218:30:0019:30:001.3If I re-run the SELECT from the QA, I get this:1900-01-01 18:00:00.0001900-01-01 23:59:59.0001.21899-12-30 18:30:00.0001899-12-30 19:30:00.0001.3Is it just me, or does this seem to be remarkably inconsistent?Edward
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Aug 15, 2007
Running [dbo].[insertlogin] ( @log = hiten, @pas = hiten ).A .NET Framework error occurred during execution of user-defined routine or aggregate "insertlogin": System.Data.SqlClient.SqlException: Must declare the scalar variable "@Log".System.Data.SqlClient.SqlException: at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnectionSmi.EventSink.ProcessMessagesAndThrow(Boolean ignoreNonFatalMessages) at Microsoft.SqlServer.Server.SmiEventSink_Default.ProcessMessagesAndThrow(Boolean ignoreNonFatalMessages) at System.Data.SqlClient.SqlCommand.RunExecuteNonQuerySmi(Boolean sendToPipe) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at SqlServerProject1.StoredProcedures.insertlogin(SqlString log, SqlString pas).No rows affected.(0 row(s) returned)@RETURN_VALUE = Finished running [dbo].[insertlogin]. ***************************************************************all i am trying to do is : creating a SP in VS using managed code and then trying to execute it. But every time i get the above error. If you can tell me how to edit connection string in this that would be very helpful. At present i am using : Using conn As New SqlConnection("context connection=true") I tried to do "" ALTER ASSEMBLY SqlServerProject1 WITH PERMISSION_SET=EXTERNAL_ACCESS""but i get this error "" Msg 10327, Level 14, State 1, Line 1ALTER ASSEMBLY for assembly 'SqlServerProject1' failed because assembly 'SqlServerProject1' is not authorized for PERMISSION_SET = EXTERNAL_ACCESS. The assembly is authorized when either of the following is true: the database owner (DBO) has EXTERNAL ACCESS ASSEMBLY permission and the database has the TRUSTWORTHY database property on; or the assembly is signed with a certificate or an asymmetric key that has a corresponding login with EXTERNAL ACCESS ASSEMBLY permission. If you have restored or attached this database, make sure the database owner is mapped to the correct login on this server. If not, use sp_changedbowner to fix the problem.""" *********************************************************************Plz help
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Mar 14, 2000
Can anyone tell me how to turn logging on to get statistics on execution times for stored procedures
Thanks
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Mar 7, 2008
Hi all,I have a problem with a stored procedure.This stored procedure inserts around bout 500,000 records but when it is executed it takes about 15-16 hours to do so.The stored procedure is using a temporary table to do this and is also calling a function.Please let me know if there is a way to reduce the execution time.will a cursor help?
Thanks,
Anne.
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Sep 18, 2006
I'm having some problems debugging SQL Server stored procedures on a SQL Server 2005 server. I have installed Visual Studio 2005 on a workstation running Windows XP, now I'm trying to debug a ASP.Net web application that has some code that executes the stored procedures on a Windows 2003 Server running SQL Server 2005.
I opened VS2005 ... created a connection to the SQL Server 2005 instance ... open the Stored procedure ... right click the stored procedure name and selected Step into Stored Procedure and the following message is displayed:
Unable to start T-SQL debugging.Could not attach to SQL Server process on 'ServerName'.
Any ideas.
Thanks,
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Dec 6, 2007
Hello, everyone:
For performance issue, I need to catch the stored procedure execution time. Any suggestion will be appreciated. Thanks.
ZYT
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Feb 21, 2002
HI,
I have an interesting situation. I have created a stored procedure which has a select union query and it accepts some parameters. When I execute this procedure it takes 8 minutes. When I copy the script in stored procedure and run it directly in Query Analyzer it takes 2 1/2 minutes?? Same numbers of rows are returned either way in the result set with about 13,000.
I cannot figure this out and it is almost the same thing except that in Query Analyzer I declare the parameters variables and its values?
Any feedback would be appreciated!
Thanks in advance...
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Jul 23, 2005
I have a Stored Procedure (SP) that creates the data required for areport that I show on a web page. The SP does all the work and justreturns back a results set that I dump in an ASP.NET DataGrid. The SPtakes a product area and a start and end date as parameters.Here are the basics of the SP.1.Create temp table to store report results, all columns are createdthat will be needed at this point.2.Select products and general product data into the temp table.3.Create a cursor that loops through all the products in the temptable, running a more complex query with each individual product.4.The results of that query are updated on the temp table based on thecurrent product of the cursor.5.A complex "totals" query is run and the results from that areinserted into the temp table as the last 3 rows.In all we are talking about 120 rows in the temp table with 8 columnsthat are mostly numbers.I originally wrote this report SP about a month ago and it worked fine,ran in about 10 - 20 seconds based on server traffic and amount ofdata in the temp table. For the example I'm running there are the120 products.Just yesterday the (SP started timing out and when I ran the SPmanually from Query Analyzer (QA) (exec SP_NAME ... ) with the sameparameters as it was getting in the code it took 6 minutes to complete.I was floored. I immediately copied the SQL out of the SP and pastedinto another QA window, changed the variables to be hard coded valuesand ran it. It completed in 10 seconds.I'm really confused now. I ran a Profiler on the 2 when I ran themagain. The SQL code in QA executed again in ~10 seconds with 65,000reads. When the SP finished some 6 minutes later it had completed witthe right results but it needed 150,000,000 reads to do its job.How can the exact same SQL code produce such different results (time,disk reads) based on whether its in a SP or just run from QA but stillgive me the exact same output. The reports both look correct and havethe same numbers of rows.I asked my Sys Admin if he had done anything to anything and he saidno.I've been reading about recompiles and temp table indexes and allkinds of other stuff that could possibly be affecting it but havegotten nowhere.Any ideas are appreciated.
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Aug 9, 2007
Hai,
I just waana know whether we can use "FOR statement" in Stored Procedures. If yes, can you describe it with some examples of how they are used in stored procedures ?
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Jan 30, 2008
Hi,
I was wondering, is it really true that in Sql Server 2005, there is no updated date -property for stored procedures? There is a created date -property, but it's not useful, because stored procedure's get updated often. This is a huge disadvantage for me, and I was really waiting for ms to fix this problem after sql server 2000, but no. Does anyone figured out any solution to this problem?
Br,
Riika
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Jan 12, 2000
How can I compile all the stored procedures in the database at one shot?
thanks in advance
Pranav
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Apr 23, 2006
Hi,In SQL 2000 if I wanted to take a complete copy of another running sqldatabase all did was create a new database locally and right-click itand select import and point to another database and click copyeverything (stored procedures as well) and it did it for. I can't seemto find the same functionality in SQL 2005. You can copy tables andviews but not the whole database. Is there another way of doing this?Our SQL database is hosted externaly and they recommend using theimport/export feature to do it. Does anyone know I can copy everything(such stored procedures, data table relations...etc)TanksMA.
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Mar 19, 2007
1). When you right click stored procedure in the Query Analyzer on 2000 you can select debug from the list of menues.
I can't find this functionality in the SQL Server Management studio.
2). By the way I also can't find where went the output of my print statement.
3). Does server cursor functionality is still working in 2k5?
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Aug 22, 2007
Hi,
I am using SQL server 2005 stored procedures being called from my java application using the CallableStatement. As long as my stored procedure is a simple and direct Select statement things are moving nicely.
But my stored procedures are a little bit more complicated and this causes problems for me to parse the data in a ResultSet.
a sample stored procedure:
Create procedure sp_Get
@cat int,
@itemId bigint
as
declare @results table (tableId bigint, label varchar(200), typeId int)
if @cat = 1
begin
insert @results (tableId, label, typeId)
select
tableId = personId,
label = fname + lname,
typeId = 1
from Person where catId = @itemId
insert @results (tableId, label, typeId)
select
tableId = prospectId,
label = prospect,
typeId = 2
from Prospects where catId = @itemId
end
else if @cat = 2
begin
insert @results (tableId, label, typeId)
select
tableId = companyId,
label = Company,
typeId = 1
from Company where regionId = @itemId
end
/* result set*/
select
tableId,
label,
typeId
from @results
GO
my java code:
Connection conn = this.getConnection() //opens connection to db
CallableStatement cmd = conn.prepareCall(" { call sp_Get (?,?) }");
cmd.setInteger("cat", 1);
cmd.setLong("itemId", 2);
//this returns false?
boolean hasResults = cmd.execute();
//this also returns false?
boolean moreResults = cmd.getMoreResults();
The strange part of this is that when you execute this query in the SQL Server Managent Studio it returns 1 result set.
Why is my java code not able to see this result?
Thanks for any help,
- Rogier
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Jan 30, 2007
Hello,
What permissions do I need to set on our new SQL Server 2005 test server so that I can see the stored procedures, views and tables from Visual Studio development environment.
Example, I can see my older SQL Server 7 tables, edit them, write stored procedures, and so on. But while I can see the SQL Server 2005 and its databases, the folder underneath are empty and I cannot right-click to create New stored procedure or table.
My guess is that there is security involved, if so, what do I set on the new server?
If I'm wrong, and it's something else entirely, please advise.
Thanks!
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Jul 18, 2007
I'm a new developer to both SQL Server 2005 & Windows 2003, so forgive me if this question seems a little too basic. I'm coming from a Oracle and UNIX background.
I've create a stored procedure in SQL Server 2005. I now want to execute this from the command line in Windows 2003. Eventually, I want our UNIX scheduler, autosys (which runs on a different UNIX machine obviously) to be able to execute this. In my old environment, I created a UNIX shell script as a wrapper let's say 123.sh. This shell script would accept as a parameter the name of the stored procedure I wanted to execute. If this stored procedure also had parameters it needed to be passed to it, I would have strung these values out in the command line in UNIX. Two examples of how the command line in UNIX I used to execute the Oracle stored procedure might look are listed below.
123.sh sp_my_stored_procedure input_parm1 input_parm2
123.sh sp_different_stored_procedure input_parm1
This way anytime I created a new stored procedure, I could reuse the shell script wrapper 123.sh and just pass in the name of the newly created stored procedure and any parameters it needed.
How can I accomplish this same type of functionality in the SQL Server 2005/Windows 2003 environment.
Thanks, Jim
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Jul 9, 2006
Hi,
I would like to use a stroed procedure within another stored procedure ( nested sp )
in a SQL project in VS.NET 2005. Since I have to use "context connection = true" as
connection string, I wont be able to use this connection for another sqlconnection
object. Because its already open. and If i try to use a regular connection string
("server=localhost;...") it will raise a security permission error. Having this
problem, Im not able to use nested stored procedures. Would anyone please give me a
hint how to resolve this issue?
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Jan 20, 2006
Stupid question but please be gentle and answer anyway please....
Background: We have SQL Server 2003 (32bit) running on our servers. Our .Net applications (from old release of VS) are still running on them and using the old databases. From what I understand there is no immediate plans to upgrade the servers. However the developers were just given this new upgrade (2005) SQL Server and VS (and fixing depreciated code etc in the .net apps).
Question: Can the applications and new stored procedures written via the 2005 environment be deployed successfully on the 2003 Servers? Same goes with Reporting Services?
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Mar 5, 2008
This question is about SQL Server 2005:
I have been trying to figure out how to copy tables and stored procedures between 2 databases (on the same server) using SQL Server Management Studio. I have tried right clicking on the table name, "script table as", "drop to", "clipboard", then I click on the 2nd database, and then click on the "tables" . I change the name of the database and click "execute". This creates the table but does not copy the data. I have also tried "create to" "clipboard" and "insert to" "clipboard" and cannot seem to be able to figure out how to get the results that I want. I am new at this but need to get the tables with the data copied along with the stored procedures, even if I have to do them one at a time. When I was using SQL Server 2000, I was able to use DTS to copy objects to other databases easily. Can someone please tell me a way to accomplish what I need to do? I have gotten information here before that was very useful and was hoping that someone can help me again.Thank you so much. Carol Quinn
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Apr 25, 2001
Hi
I have many existing tables within my db with the date format mm/dd/yyyy
Is it possible to run a stored procedure in order to convert the EXISTING records to the date format dd/mm/yyyy?
Thanks
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Sep 30, 2006
Hi,
This Might be a really simple thing, however we have just installed SQL server 2005 on a new server, and are having difficulties with the set up of the Store Procedures. Every time we try to modify an existing stored procedure it attempts to save it as an SQL file, unlike in 2000 where it saved it as part of the database itself.
Thank you in advance for any help on this matter
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Dec 20, 2007
I have successfully moved my data from a SQL Server 2000 hosting site to a SQL Server 2005 hosting site. I Made a backup of my database using Enterprise Manager (2000) and imported the database tables using SQL Server Management Studio (2005). I do not know how to move the 25 or so stored procedures that I have in SQL Server 2000. I have a very short amount of time to figure this out and am hoping that someone can give me a brief step by step answer on how to get this done. I would appreciate any information you can provide. Thank you!!
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Apr 14, 2008
Hello,
I have a database (SQL 2005) with two schemas (dbo and s1) and with tables defined in dbo and tables defined in s1. The stored procedures are also defined in both schemas, some of them in dbo some of them in s1. Some of the stored procedures query tables from dbo and s1 at the same time.
I want to have a new db role with access to the database only through sps and no other access read/write to the tables. I created a new db role and granted execute permission to it and assigned a user to it.
When I execute stored procedure defined in dbo with query against dbo tables, it works as expected.
However, if I run stored procedure defined in s1 with query to table in dbo, I receive error about missing select permission for the table in dbo. I am not sure why, but I can assume there is an issue with the ownership chain.
I can grand read/write permission for the tables, but this will break our original requirement for limited access to the db only through sp.
The other option is to have another role r2, with read/write, privilege and to use EXECUTE AS r2 in the sp.
I would like to ask first why the error for missing select permission happens and is there another way to have role restricted to only execute permission for all stored procedures.
Thanks,
IT
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Oct 31, 2006
It's been about two weeks since I first began using SQL Stored procedures and now I am thinking already about changing many of my plans and doing those operations in them. There is a problem I want to address and see if it is possible to accomplish it in SQL Server instead of the client C# code.
I have a time series. In simplified presentation it is a table of two columns. The first one is float, the second is DateTime. There might be quite a few rows in the table:
A1 ... DT1
A2 ... DT2
................
An.... DTn
What I need to do is to find patters among A1,A2,....An elements. They vary in magnitude in a rather random order. They constitute what some would call a Markov chain. I demonstrate what I want in a couple of real life examples that I would not have a problem to run in my C# code at all.
(1) element Ak may be only 90% of the element in the previous row Ak-1. I want to catch it. I want to get the DateTime stamp when it happened. The next step is: I want to go down the chain of rows and find the element Am which rebounds to the magnitude of the element Ak. In other words Am==Ak. I want to remember its DateTime stamp.Then I want to find all elements in the chain of rows that follow the same pattern.
How can I do it in SQL language? Is it possible? I've been thinking about creating a bunch of temporary tables with rows shifted up by one and and destroying them after a pattern has been found in the same rows of many tables.
(2) I want to collect a distribution of many such patterns and analyze then in C# code but the elementary block is the operation I described in point (1). If I could get a cue as to how to go about it I could figure out the rest, I hope.
I learn by examples, by looking at code samples. So far I haven't seen anything that fits this task. If anyone could send me in such direction it would be great. Most of the things I've seen is "SELECT FROM CUSTOMERS," etc.
A somewhat related question. Years ago I stumbled in MSN help on a set of Math routines (they could have been part of a class) that were designed specifically for analyzing patters. It is not the Math class, I have looked into it. It is something different. I cannot find them now. I did not save a bookmark back then.
Does anyone know what I am talking about: math functions for time series analysis?
Thanks.
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