One Query Killing Performance For All Queries
Jan 15, 2008
We have an issue where a cube hasn't been designed properly - when someone queries it with Excel, it is doing a mega-crossjoin. When anyone else tries to do *anything* on the AS server (connect with management studio, etc.) it just hangs. We have to either track down the person running the query (via the flight recorder), or restart the service. Obviously the correct fix is to change the design of the cube - I plan on doing it asap. But it brings up this important question - is there a setting I can change to allow others to use the box while this is going on? Maybe some thread isolation, or parallelism? I'm just throwing out ideas, as I haven't experienced this part of AS administration yet.
Thanks in advance,
John
View 7 Replies
ADVERTISEMENT
Jun 15, 2007
I have recently started working with a new group of people and I find myself doing a lot of reporting. While doing this reporting I have been writing a TON of sql. Some of my queries were not performing up to par and another developer in the shop recommended that I stay away from the "GROUP BY" clause.
Backing away from the "GROUP BY" clause and using "INNER SELECTS" instead as been more effective and some queries have gone from over 1 minute to less that 1 second.
Obviously if it works then it works and there is no arguing that point. My question to the forum is more about gather some opinions so that I can build an opinion of my own.
If I cannot do a reasonable query of a couple of million records using a group by clause what is the problem and what is the best fix?
Is the best fix to remove the "GROUP BY" and write a query that is a little more complex or should I be looking at tuning the database with more indexes and statistics?
I want to make sure that this one point is crystal clear. I am not against following the advice of my coworker and avoiding the "GROUP BY" clause. I am only intersted in listening to a few others talk about why the agree or disagree with my coworked so that I can gain a broader understanding.
View 6 Replies
View Related
Mar 12, 2008
Hi all
I have a Large log table with large size data(I month only),If I run a query like SELECT * FROM <table_name> Server will go€¦very very slow€¦.
Because of large Data system is going slow€¦..
Please some body helps me with suggestion how get good performance.
View 4 Replies
View Related
Nov 3, 2004
All,
Is there a way to have SQL server automatically kill a spid when its result set gets to be larger than a specific threshold( eg 3 gigs) ?
Any help is greatly appreciated: any sample stored procedures or code library for doing something like this?
Thanks,
Isaac
View 1 Replies
View Related
Sep 13, 2004
I am updating a db with data from a file, in this data we have new info, info that has been updated and info that is to be removed from the db.
Now I was wondering which approach results in better performance/shorter executin time:
1. first update excisting values, then insert new ones, and last delete cancelled data
or
2. delete cancelled data and data that will be updated, then insert new and updated info
I get all this data from a file, in that file all rows are similar and there is one column that defines if the data is new, updated or to be deleted (thus all the updates also include the information for the enty that has not been altered).
// Pati
View 4 Replies
View Related
Mar 5, 2001
Does anyone know how to improve performance on insert statements. I have to run a query of several thousand insert statements, but it just takes too long. Does anyone know of any good tips to improve performance?
joe
View 3 Replies
View Related
Nov 22, 2006
Hey there :)Sorry if I'm asking a dumb question here, but I'm still quite new to MS SQL,so this problem might appear larger to me than it really is.I'm trying to create a performance test environment for a Ruby on Rails andMongrel setup with an MS SQL Server 2000.The adapter, mssqlclient, uses some kind of "conversion" for unicode, here'sa quote from the homepage:"Automatically translate from proper UTF-16LE nvarchar fields in thedatabase to UTF-8 Ruby Strings you can display in your application"As far as the local DB designer knows, we're not using UTF16-LE nvarcharfields, unless it's something that happens implicitly.Either way, this is how a query from the mssqlclient adapter might look:SELECT TOP 1 * FROM Item WHERE (Item.Itemnumber = N'45783745')Response time the first couple of times was upwards of 20+ seconds, afterthe sql server has "awaken from its slumber", it's roughly 4 seconds.Omitting the "N" from the WHERE clause, response time is in milliseconds (asone would expect, regardless of the fact that there's currently >2.5million items in the table).Any tips on how to resolve this? Is the SQL statement bad, or is it aquestion of configuring SQL Server correctly?Thanks in advance for any help,Daniel Buus :)--http://www.rhesusb.dk
View 2 Replies
View Related
Feb 27, 2008
Hi All
I struck up with Slow perfornace query,Please some body help me how to analyze Slow perforamnce queris.
View 6 Replies
View Related
Dec 5, 2007
I have a number of complex search stored procedures that use the following syntax to try to simplify the code.
WHERE @SearchParam IS NULL OR SearchCol = @SearchParam
unfortunately it appears that this is really inefficient as far as the database is concerned.
If I run the following query on the AdventureWorks database (SQL Server 2005 with SP2 and fixes up to v3054)
Code Block
SET STATISTICS IO ON
Declare @CustomerID int
SET @CustomerID = 1
SELECT SalesOrderID
FROM Sales.SalesOrderHeader
WHERE @CustomerID IS NULL OR CustomerID = @CustomerID
SELECT SalesOrderID
FROM Sales.SalesOrderHeader
WHERE CustomerID = @CustomerID
Is see that the first select results in 45 logical reads, whereas the second results in only 2 logical reads.
Does anyone have any idea how I can get the benefit of a search procedure that does not have loads of IF blocks, or dynamic SQL without this major performance issue?
Cheers,
Justin
View 3 Replies
View Related
Dec 1, 2005
Hello everyone, I am hoping someone can help me with this problem. Iwill say up front that I am not a SQL Server DBA, I am a developer. Ihave an application that sends about 25 simultaneous queries to a SQLServer 2000 Standard Edition SP4 running on Windows 2000 Server with2.5 GB of memory. About 11 of these queries are over views (all overthe same table) and these queries are all done from JDBC but I am notsure that matters. Anyway, initially I had no problem with thesequeries on the tables and the views with about 4 years of information(I don't know how many rows off hand). Then we changed the tables toreplicated tables from another server and that increased the amount ofdata to 15 years worth and also required a simple inner join on 2columns to another table for those views.Now here is the issue. After times of inactivity or other times duringthe day with enough time between my test query run I get what lookslike blocking behavior on the queries to the views (remember these allgo to the same tables). I run my 25 queries and the 11 view queriesall take about 120 seconds each to return (they all are withinmilliseconds of each other like they all sat there and then werereleased for processing at the same time). The rest of the queries arefine. Now if I turn around and immediately run the 25 queries again,they all come back in a few seconds which is the normal amount of time.Also, if I run a query on one of views first (just one) and then runthe 25 queries they all come back in a few seconds as well.This tells me that some caching must be involved since the times are sodifferent between identical queries but I would expect that one of thequeries would cache and thus take longer but the other 10 would befast, not all block for 2 minutes. What is more puzzling is that thisbehavior didn't occur before where now the only differences are:1) 3 times more data (but that shouldn't cause a difference from 3seconds to 120 and all tables have been through the index wizard with aSQL trace file to recommend indexes)2) There is now a join between 2 tables where there wasn't before3) The tables are replicated throughout the day.I would appreciate any insight into this problem as 120 seconds is waytoo long to wait. Thanks in Advance.Chris
View 1 Replies
View Related
Jul 20, 2005
I changed from Access97 to AccessXP and I have immense performanceproblems.Details:- Access XP MDB with Jet 4.0 ( no ADP-Project )- Linked Tables to SQL-Server 2000 over ODBCI used the SQL Profile to watch the T-SQL-Command which Access ( whocreates the commands?) creates and noticed:1) some Jet-SQL commands with JOINS and Where-Statements aretranslated very well, using sp_prepexe and sp_execute, including thesimilar SQL-Statement as in JET.2) other Jet-SQL commands with JOINS and Where-Statements aretranslated very bad, because the Join wasn´t sent as a join, Accesscollects the data of the individual tables seperately.Access sends much to much data over the network, it is a disaster!3) in Access97 the same command was interpreted wellCould it be possible the Access uses a wrong protocol-stack, perhapsJet to OLEDB, OLEDB to ODBC, ODBC to SQL-Server orJet to ODBC, ODBC to OLEDB and OLEDB to SQL-Server instead ofJet to ODBC and ODBC direct to SQL-ServerDoes anyone knows anything about:- Command-Interpreter of JetODBC, Parameters, how to influence thecommand-interpreter- Protocol-Stack of a Jet4.0 / ODBC / SQL-Server applicationThanks , Andreas
View 6 Replies
View Related
Jun 23, 2006
Hello Everyone,I have a very complex performance issue with our production database.Here's the scenario. We have a production webserver server and adevelopment web server. Both are running SQL Server 2000.I encounted various performance issues with the production server with aparticular query. It would take approximately 22 seconds to return 100rows, thats about 0.22 seconds per row. Note: I ran the query in singleuser mode. So I tested the query on the Development server by taking abackup (.dmp) of the database and moving it onto the dev server. I ranthe same query and found that it ran in less than a second.I took a look at the query execution plan and I found that they we'rethe exact same in both cases.Then I took a look at the various index's, and again I found nodifferences in the table indices.If both databases are identical, I'm assumeing that the issue is relatedto some external hardware issue like: disk space, memory etc. Or couldit be OS software related issues, like service packs, SQL Serverconfiguations etc.Here's what I've done to rule out some obvious hardware issues on theprod server:1. Moved all extraneous files to a secondary harddrive to free up spaceon the primary harddrive. There is 55gb's of free space on the disk.2. Applied SQL Server SP4 service packs3. Defragmented the primary harddrive4. Applied all Windows Server 2003 updatesHere is the prod servers system specs:2x Intel Xeon 2.67GHZTotal Physical Memory 2GB, Available Physical Memory 815MBWindows Server 2003 SE /w SP1Here is the dev serers system specs:2x Intel Xeon 2.80GHz2GB DDR2-SDRAMWindows Server 2003 SE /w SP1I'm not sure what else to do, the query performance is an order ofmagnitude difference and I can't explain it. To me its is a hardware oroperating system related issue.Any Ideas would help me greatly!Thanks,Brian T*** Sent via Developersdex http://www.developersdex.com ***
View 2 Replies
View Related
Apr 11, 2000
Hey,
How can we kill a process initiated by an Extended Stored Procedure.
For example, I issued
exec xp_cmdshell "C:Notepad.exe"
and scheduled as a job and it started running and it never finished.
I dunno watz goin on behind the scene and i couldnt kill the process.
Anybody who knows how to do it,please help me out. And my process is still
running in the server for more than two days. Do i have to restart the
server? If so, everytime when it get a problem like this, am i supposed to restart?
Please help me in this issue...
View 1 Replies
View Related
Jul 8, 2005
Hi, i was try a very simple transaction, but it show me error: Exception Details: System.InvalidOperationException: This SqlTransaction has completed; it is no longer usable. Below is my code, wat i did wrong for tis... i tried 2 days just for transaction alrd.... pls help.Sub bt1_click(sender as object, e as eventargs) dim i as integer Dim myTrans As SqlTransaction dim strExDate,StrSAPNum,strID,StrPartNum,strRemark,strWAID,strQty,strQty1,StrPartNum1 as string '================ loop thru n insert data=============================== try for i=0 to DgData.items.count-1 strExDate = CType(dgData.Items(i).FindControl("tbExDate"), textbox).text strRemark = CType(dgData.Items(i).FindControl("tbRemark"), textbox).text strQty = CType(dgData.Items(i).FindControl("tbQty"), TextBox).text StrSql="Insert into tbl_GrDE(Qty, ExDate, Remark, EntBy) Values " & _ (@Qty, @ExDate, @Remark, @EntBy)" ObjCmd=New SqlCommand(StrSql, ObjConn) With ObjCmd.Parameters: .Add(New Sqlparameter("@qty", strQty)) .Add(New Sqlparameter("@ExDate", strExDate)) .Add(New Sqlparameter("@Remark", strRemark)) .Add(New Sqlparameter("@EntBy", session("User_ID"))) End with
ObjCmd.Connection.Open() myTrans = ObjConn.BeginTransaction ObjCmd.Transaction = myTrans ObjCmd.ExecuteNonQuery() ObjCmd.Connection.Close() next myTrans.Commit() catch ex as exception response.write("error") myTrans.Rollback() end tryEnd SubRegardslife's Ng
View 4 Replies
View Related
May 30, 2001
Hi
One DTs package job running and we stop the job.Job was stoped but process not killing.We tried using kill spid but no use.please any body give suggestion. this production server.
View 3 Replies
View Related
Jan 10, 2001
Please could anyone help I run an restore on a specific database overnight, in order to do so I have to kill all user connections. When I try to kill all user SPIDs some still remain ? , why please can anyone help me !
Heres a typical example of what I am doing:
sp_who snapshot of before the kill:
61,sleeping,TDI.CO.UKSUZANA, ,0,RPT,AWAITING COMMAND
63,runnable,TDI.CO.UKNEILL, ,0,RPT,SELECT
Attempting to disconnect 2users
KILL 61
KILL 63
sp_who snapshot of After the kill:
63,runnable,TDI.CO.UKNEILL, ,0,RPT,SELECT
I would greatly appreciate any help , im using SQL Server 7 currently
Many Thanks,
Marcus Stuart
View 4 Replies
View Related
Dec 22, 1999
I'm going to try to explain my situation.
I have a spid that I'm not able to kill, this were a select statement from with in access 97 application using a DNS connection.
So even that I reboot the client pc and kill the spid it still shows as active with status RollBack.
We have similar problem before and the only way that it disappear were re - starting Sql.
(system Sql 7.0 with sp1 and Access 97)
Thanks.
View 2 Replies
View Related
Apr 15, 2003
I have a script that I use to see if someone has been logged in for too long. Does anyone know how to take a varible spid and kill that login. I tried using kill @spid, but that does not work. Any Suggestions?
View 1 Replies
View Related
Aug 28, 2002
Dear SQLGuru,
I hope you can help me to find the way to resolve this issue.
When I've accidentally triggered a process in SQL 6.5 without knowing that it's going to hold a lot of resources and making the network very slow and end users will be started complaining about the slowness.
I've no other way other than the killing the process kill <spid>. Funniest part is, even it is not get killed even when I tried multiple times and the process is still active and still running.
When I tried to find the way out, One another guy stopped the SQL server and restarted again. That's it, it took a long time to stop and restart and ends up with the recovery mode of the database and it was running more than 3-4 hours to get into the usual mode.
Based on the scenario, what would be your suggestion when I've encoutered the same situation. I've triggered some application like DBCC checkdb and it's keep running for a long time. But I need to kill the process immediately without affecting any other process. Pls. advise me.
Thanks a lot,
Naga
View 1 Replies
View Related
Apr 15, 2002
I have a problem. I am trying to kill a spid that is blocking updates to a table.
The spid number is '-2'. I am using KILL with UOW and I am getting this error:
Server: Msg 6112, Level 16, State 1, Line 1
Distributed transaction with UOW {FCF8D536-27ED-11D6-9CF2-0002A56BDA54} is in prepared state.
Only Microsoft Distributed Transaction Coordinator can resolve this transaction. KILL command failed.
Users are connecting through MTS server. I am runnnig SQL2000 sp2 +hotfix, on NT4.0.
Has anyone encountered this problem before, and has a solution for it (besides rebooting the MTS and SQL Server)?
Thanks,
Peter
View 1 Replies
View Related
Dec 2, 2004
Hey all,
Just wondering if there is any way to kill a thread within an sqlerver process. The thread we are trying to kill is a rollback statement that has been running for a very long time.
Any ideas ?
Thanks in advance,
Kilka
View 7 Replies
View Related
May 25, 2008
If we have a deadlock we will check in the error log and and find the spids which are involving in the deadlock.
We will kill one of the process by using SPID (no) KILL.
Is there specific steps to consider while killing a process
View 3 Replies
View Related
Sep 1, 2004
Hi,
I would like to use the result table of the first query in a number of other queries. How do I do this ?
Thanks.
View 2 Replies
View Related
Jul 20, 2005
HiI have the following tables and stored procedure. I need to pass a value tothe stored procedure and have it use the value in a query. After runningthat query it will return an ID which is then used in an insert statement.At present the values in @MovieId int, @UserID int are left empty (see myoriginal code at the bottom of posting). I think this is due to an issuewith when the sql is executed (?).I get the feeling I should have something like this instead, but not sure:ALTER proc inserttransactions@MovieName nvarchar(50) = 'team',@uName nvarchar(50) = 'frank',@FrameNumber int = 0asDECLARE @MovieId int, @UserID int-- Find MovieID from MovieName@MovieId = exec MovieName2Id @MovieName-- Find UserID from UserEmail@UserEmail = exec Email2UserId @uName-- Insert DataINSERT INTO Transactions(MovieId, UserId, FrameNumber)VALUES (@MovieId, @UserID, @FrameNumber)Thanks in advance.========MY CODE=============Tables:CREATE TABLE [dbo].[movies] ([movieID] [int] IDENTITY (1, 1) NOT NULL ,[movieName] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,[movieDateAdded] [datetime] NOT NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[transactions] ([userID] [int] NULL ,[movieID] [int] NULL ,[FrameNumber] [int] NOT NULL ,[transDate] [datetime] NOT NULL) ON [PRIMARY]GOCREATE TABLE [dbo].[users] ([userID] [int] IDENTITY (1, 1) NOT NULL ,[userEmail] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,[userDateRegistered] [datetime] NULL) ON [PRIMARY]GOStored Procedure:ALTER proc inserttransactions@MovieName nvarchar(50) = 'team',@uName nvarchar(50) = 'frank',@FrameNumber int = 0asDECLARE @MovieId int, @UserID int-- Find MovieID from MovieNameSELECT @MovieId = MovieIdFROM MoviesWHERE MovieName = @MovieName-- Find UserID from UserEmailSELECT @UserID = UserIDFROM UsersWHERE UserEmail = @uName-- Insert DataINSERT INTO Transactions(MovieId, UserId, FrameNumber)VALUES (@MovieId, @UserID, @FrameNumber)GOSET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS ONGO
View 2 Replies
View Related
Mar 24, 2004
hi, what is a good way to kill the duplicates from a table. when i say killing duplicated, i mean killing all the rows for the repeated row.
WorkTempID ItemNo Seq
100196 RTP-22 1
100197 RTP-22 2
100198 RTP-22 3
100199 RTP-22 3
100200 RTP-22 4
100201 RTP-22 4
100202 RTP-22 5
100203 RTP-22 5
********************************************************
see how Seq 3, 4 and 5 are repeated? so for the output i want.
WorkTempID ItemNoSeq
100196RTP-221
100197RTP-222
********************************************************
i DO NOT want this as the output. i already know how to achive this using DISTINCT keyword
WorkTempID ItemNoSeq
100196RTP-221
100197RTP-222
100198RTP-223
100200RTP-224
100203RTP-225
View 12 Replies
View Related
Oct 19, 2000
Is there a way to kill all user connections to a database using T-SQL?
Thanks!
View 2 Replies
View Related
Dec 17, 1999
if we kill sp, let's say, on the third statement, will the first two
be rolled back (undo) ?
View 1 Replies
View Related
Aug 30, 1999
I wish to select processes from sysprocess that are SLEEPING and more than a certain time old (say 10 minutes) so that I may KILL them. I can get the query to do the select, but how do I KILL the process? I have tried selecting the SPID into a local variable and then trying KILL @var_name, but I get "Incorrect syntax near '@var_name'".
I have tried all of the resources that I can find, but without success. Is this possible? If so, how do I go about doing it?
Thanks in advance.
Matthew
View 3 Replies
View Related
Jul 21, 1999
If I kill a blocked process, why does the current activity window still show the process? Both processes, blocking and blocked, are scheduled tasks. Also, the blocked process is still listed as a running task in the manage scheduled task window.
View 1 Replies
View Related
Oct 10, 2006
Hi Peepz! my problem is this i am managing more than 3 servers which has a many users. this servers have one common problem. the most users uses high cpu utilizations what make it worst is even if the process is already done for a long time (status = sleep) they still uses high cpu or IO utilization. One time i ask to confirm one user if they are really having that process and found out that the user have gone home already and no other is using thier computer. And assuming that we have more than 20 users with the same case it really make the server slow and occationally hangup. i try to kill these process/user but i think killing is not an option. Kindly help pls. are there any way to refresh connections or terminate it, how do you handle this situations?
Thanks,
Keez.
If you give me a fish ill eat for a day but if you teach me how to fish ill eat for life. :beer:
View 12 Replies
View Related
Sep 22, 2014
I am working with a report performance issue.The report is a consolidated report of 4 other report. I need to remove one of the report from that. How to do?
View 0 Replies
View Related
Feb 16, 2015
I did Index defragmentation a week ago . for 1 database only , In the middle of rebuild I kill the process twice cause It takes more than 1 hour so I killed it and wonder how many high level fragmented indexes left ...
View 2 Replies
View Related
Apr 12, 2006
Hi everybody,We have a very large database and high transaction volume. Time to timethese transactions are locking each other and decrease the performanceof the database. Is there any way that I can automate the killingprocess when blocking and deadlock time is exceeded in certain timeelipsade? Can somebody help me on this please?Regardsasa.
View 6 Replies
View Related
