Slow Query When Run In Multiple Threads
Aug 9, 2006
Hi, I'm trying to stress test my web application, but when I get high load, the queries that used to take 10-20 ms starts taking 500 - 2000+ ms. Or to put it another way, when i run them single threaded i can do about 43000 a minute, when they are run in paralell it drops to about 2500 a minute.
What can i do about this ?
There are severeal queries thats affected, but here is one example:
update [user] with (ROWLOCK XLOCK) set timestamp = getdate() where userid = 1''
btw: im running sql server 2005 sp 1. The stress test is run on 3 machines total (web, sql and client) the client is simulation 400 users, cliking a page as soon as the last one is loaded, ie there will always be 400 page requests.
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Aug 22, 2007
hi,
do i need to use specially synchronized code if i have multiple threads inserting, updating and reading rows to and from the same database?? in this case, i know that no 2 threads will try to insert or update the exact same row into the DB, however, multiple threads might try to read the same row from the database.
thanks!
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Dec 21, 2004
Our company is in the retail business, thus, the window for processing cubes is very small during Christmas season (only 4 hours each day).
To speed things up, we have partitioned our cube at monthly level so, potentially, 12 threads can be run simultantsly. However, when I looked at DTS, I am not so sure whether or how it can accomplish that task. Has anyone tried this before or is aware of another third party tool can do the trick?
thx in adcance,
Carl.
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Mar 3, 2008
Hi All
I have been asked by developers if there is any advantage in processing multiple clustering models simultaneously by using AMO and multiple threads as against processing one after another.
I have limited experience with Analysis Services but based on my reading I don't see this method providing any advantage.
Does anyone have any recommendations or advice? The system Enterprise Edition running on an x86 Server with 2 dual core processors and 4GB of RAM. Would the answer alter if the server running x64 version of SQL Server and Windows.
Thanks
Nadreck
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Jan 24, 2006
I found a peculiar thing today while working with SQL Mobile in a multithreaded application (VS2005, application for Pocket PC 2003).
I created a class which has one SqlCeConnection object. Every time I call a function to insert/select/delete something from the local db, I open the connection, execute the query an then close the connection again.
But when I'm calling a function from the db class in thread 1 and in the meantime call a different function (from the same db class of course) in thread 2, things go wrong. Because when function 1 wants to close the connection, function 2 is still using the connection and it will crash my application with a native exception (0xC0000005: access violation).
I can see why the error is happening, but shouldn't there be a nice .NET handled exception instead of a native exception which grinds my app to a hold?
(A workaround I use now is to use multiple connection objects instead of one, but I thought I'd give this feedback anyway)
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Jul 16, 2001
Hi Guys,
I am searching for some information on achieving performance improvement by spawning multiple threads in single Stored procedure or rather say within Single Database connection. We have a batch process that updates around 200 tables and each table update takes around 2 mnts. I am trying to optimize this by running these updates in parallel rather than sequential. These all tables are mutually exclusive. I have written a stored procedure which updates these tables in loop. Concern is that every update statement waits for other to get over. I am calling this Sp from Java application. One crude way will be opening multiple connections to database each running separate T-SQL statement. It comes with lot of overhead in opening connections .Is there any way I can force explicitly in T-SQL stored procedure to spawn a new thread for every Update statement. In case I try to do same process from a Java connection.. is there a way I can open multiple threads for each statement under same database connection.
Thanks,
Vikalp
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Jul 24, 2012
we are queirying an stored procedure multiple times same time,from our application. In this case, few processes executing successfully and few getting failed with error "50000 error executing the stored procedure" and if we run thesame process again its getting executed sucessfully.Does the MySQL cannot handle multiple threads same time?
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Aug 14, 2007
Hi,
I am using distributed transactions where in I start a TransactionScope in BLL and receive data from service broker queue in DAL, perform various actions in BLL and DAL and if everything is ok call TransactionScope.Commit().
I have a problem where in if i run multiple instances of the same app ( each app creates one thread ), the threads pop out the same message and I get a deadlock upon commit.
My dequeue SP is as follows:
CREATE PROC [dbo].[queue_dequeue]
@entryId int OUTPUT
AS
BEGIN
DECLARE @conversationHandle UNIQUEIDENTIFIER;
DECLARE @messageTypeName SYSNAME;
DECLARE @conversationGroupId UNIQUEIDENTIFIER;
GET CONVERSATION GROUP @conversationGroupId FROM ProcessingQueue;
if (@conversationGroupId is not null)
BEGIN
RECEIVE TOP(1) @entryId = CONVERT(INT, [message_body]), @conversationHandle = [conversation_handle], @messageTypeName = [message_type_name] FROM ProcessingQueue WHERE conversation_group_id=@conversationGroupId
END
if @messageTypeName in
(
'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog',
'http://schemas.microsoft.com/SQL/ServiceBroker/Error'
)
begin
end conversation @conversationHandle;
end
END
Can anyone explain to me why the threads are able to pop the same message ? I thought service broker made sure this cannot happen?
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Jun 18, 2014
I have two tables called ECASE and PROJECT
In the ECASE table there is trigger to get the max value of case_id column in ecase based on project and increment one to that case_id value and insert into ecase table .
When we insert a new record to the ECASE table this trigger calls and insert the case_id column value.
When i run with multiple threads , the transaction is rolled back because of trigger . The reason is , on the project table the lock is happening while getting the max value of case_id column based on project.
I need to prevent the deadlock .
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Jul 23, 2005
I am able to run a query which runs FAst in QA but slow in theapplication.It takes about 16 m in QA but 1000 ms on theApplication.What I wanted to know is why would the query take a longtime in the application when it runs fast on SQL server?How should we try debugging it?Ajay
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Nov 19, 2004
I have an update query running which to just now has been running for 22 hours running on two tables 1 a lookuptable that has just been created within the batch the other a denormalised table for doing data analysis on
the query thats causing teh problem is
--//////////////////////////////////// this is the one thats running
Print 'Update Provider 04-05 EmAdmsCount12mths : ' + CAST(GETDATE() AS varchar)
GO
Update Provider_APC_2004_05
set EmAdmsCount12mths =
(Select COUNT(*)-1
from Combined_Admissions
where ((Combined_Admissions.NHSNumber = Provider_APC_2004_05.NHSNumber) or
(Combined_Admissions.PASNUMBER = Provider_APC_2004_05.PDDISTNO)) and
(Combined_Admissions.AdmDate BETWEEN DateAdd(yyyy,-1,Provider_APC_2004_05.AdmDate) AND Provider_APC_2004_05.AdmDate) AND
Combined_Admissions.AdmMethod like 'Emergency%')-- and
-- CA.NHSorPrivate = 'NHS'))
FROM Provider_APC_2004_05, Combined_Admissions
any help in improving speed would be most welcome as there are 3 more of these updates to run right after this one and the analysis tables are almost double the size of this one
Dave
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Sep 25, 2006
Hi there
Running query analyzer against two different server.
the first only need 1-2 secs to return the query result,
the other return 7-8 secs for the query result.
plz advice what could cause this slow performance?
thx
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Mar 8, 2007
This sounds like a pretty easy one. I have a SQL 2000 database with 2-3.4GHZ CPUs and 1GB of RAM. I have one database on it. I go in Query Analyzer on another machine and run a simple query like 'SELECT * FROM USERS' which should return 15,000 rows.
IT takes 30 (thirty) seconds to finish this query. OMG
Where do I start to decipher why on Earth this takes more than .01 seconds?
Thanks.
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Mar 16, 2001
Hi,
I have a query which has suddenly started responding slow.
CAn anyone tell me what could be the possibilities?
I tried update stats(I am on sql 70-though it's done auto but i did it manually again)
I used union all in place of union but had no big effect.any othe thought?
Thanks!
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Oct 12, 2000
Hi,
I have a query that takes minutes to execute, even through there are about 300,000 records are being processed. I would appreciate any help with optimizing that query.
I have two tables: User and Usage. Table user has two fields: User_Id and Date_Created and a non-clustered index on User_Id. Table usage has two fields also: User_Id and Date_Used and non-clustered index on both fields. The User table is populated when the user registers. The Usage table is populated every time the user opens a document.
Here is what I need to do: get the number of users from the Usage table who opened a document at least once after they have registered during the last 30 days for each day in the time frame, where the time frame varies.
For example, if the time frame is 8/01/00 - 8/31/00, I need to get the following data:
date returns
---- -------
8/01/00 10 (10 users returned to the document between 7/2/00 and 8/1/00)
8/02/00 15 (15 users returned between 7/3/00 and 8/02/00)
.
.
.
8/31/00 20 (20 users returned between 8/1/00 and 8/31/00)
Here is my query:
SELECT [date],
(SELECT count(distinct user_id)
FROM usage u JOIN [user] ON u.[user_id] = [user].[user_id]
WHERE u.[date] BETWEEN usage.[date]-30 AND usage.[date]
AND u.[date]>[user].date_created
GROUP BY usage.[date])returns
FROM usage
WHERE [date] BETWEEN @date1 AND @date2
This query works fine, but too slow. We use MS SQL server 7.0.
Thank you,
Yana
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Dec 2, 2002
I have a query which responds immediately when run however if I add an order by clause it takes 40 seconds. Below is the query with the order by clause
SELECT distinct Licenseplate, platetypecode.platetypecode, platetypecode.platetypecodeid
FROM Ticket INNER JOIN PlateTypeCode
ON PlateTypeCode.PlateTypeCodeID = Ticket.PlateTypeCodeID
ORDER BY licenseplate
The Ticket table contains approx. 11,000 records. I have created a nonclustered index for the licenseplate field, a 7 char varchar field.
Any suggestions for speeding up the query?
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Jun 15, 2004
The following query is causing some problems because it's taking too long to complete. I looked at the estimated execturion plan and I am unsure why it appears to spend over 50% of its time doing a 'Bookmark Lookup' on on particular column (SRA_SR_ID in the S_EVT_ACT table). There is an index on the column - S_EVT_F14. I'm not sure if the query is using the index properly. What can be done to specifically improve this particular problem? In general, does anyone have some suggestions for optimizing the query as a whole?
Thanks in advance. Clive
SELECT
T1.APPT_REPT_FLG,
T18.X_ALIS_ID,
CONVERT (VARCHAR (10),T1.APPT_START_TM, 101) + ' ' + CONVERT (VARCHAR (10),T1.APPT_START_TM, 8),
T1.ASGN_USR_EXCLD_FLG,
T2.NAME,
T19.STAT_CD,
T1.APPT_REPT_TYPE,
T15.NAME,
CONVERT (VARCHAR (10),T1.TODO_ACTL_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_ACTL_END_DT, 8),
T1.TODO_CD,
T1.X_DOC_CAT_ID,
CONVERT (VARCHAR (10),T1.TODO_PLAN_START_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_PLAN_START_DT, 8),
T1.TARGET_OU_ID,
T7.ZIPCODE,
T3.ZIPCODE,
T9.EXP_RPT_NUM,
T1.LAST_UPD_BY,
T1.OWNER_PER_ID,
T1.PART_RPR_ID,
T1.RATE_LST_ID,
CONVERT (VARCHAR (10),T1.APPT_REPT_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.APPT_REPT_END_DT, 8),
T1.ACTIVITY_UID,
T4.NAME,
T1.PR_TMSHT_LINE_ID,
T18.LAST_NAME,
T7.ADDR,
T18.SEX_MF,
T1.BILLABLE_FLG,
CONVERT (VARCHAR (10),T1.TODO_PLAN_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_PLAN_END_DT, 8),
T1.SRA_SR_ID,
T1.TARGET_PER_ADDR_ID,
T18.X_FST_NAME,
T1.EVT_STAT_CD,
CONVERT (VARCHAR (10),T1.X_SCAN_DATE, 101) + ' ' + CONVERT (VARCHAR (10),T1.X_SCAN_DATE, 8),
T1.ROW_STATUS,
T1.ACD_CALL_DURATION,
T5.NAME,
T8.FAX_PH_NUM,
T8.X_FST_NAME,
T8.LAST_NAME,
T1.MODIFICATION_NUM,
T1.X_CAMP_ID,
CONVERT (VARCHAR (10),T1.X_SCAN_TIME, 101) + ' ' + CONVERT (VARCHAR (10),T1.X_SCAN_TIME, 8),
T1.ASSOCIATED_COST,
T13.NAME,
CONVERT (VARCHAR (10),T1.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T1.LAST_UPD, 8),
T17.TMSHT_NUM,
T1.PR_SYMPTOM_CD,
T1.OPTY_ID,
CONVERT (VARCHAR (10),T18.BIRTH_DT, 101) + ' ' + CONVERT (VARCHAR (10),T18.BIRTH_DT, 8),
T1.PR_EXP_RPT_ID,
CONVERT (VARCHAR (10),T1.APPT_START_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.APPT_START_DT, 8),
T8.FST_NAME,
T16.SR_NUM,
T1.SRA_DEFECT_ID,
T1.CREATED_BY,
T8.WORK_PH_NUM,
CONVERT (VARCHAR (10),T1.COST_EXCH_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.COST_EXCH_DT, 8),
T1.CALL_ID,
T1.X_CLIENT_ID,
T1.PROJ_ID,
T12.DEFECT_NUM,
T1.CREATOR_LOGIN,
T1.CONFLICT_ID,
T19.OUTCOME_CD,
T1.TEMPLATE_FLG,
T2.PR_ADDR_ID,
T1.PREV_ACT_ID,
T1.X_DOC_NAME,
T1.EXP_RLTD_FLG,
T1.X_BATCH_REF,
T1.PRI_LST_ID,
T1.SRC_ID,
T1.X_POLICY_REF,
CONVERT (VARCHAR (10),T1.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T1.CREATED, 8),
T1.EMAIL_FORWARD_FLG,
T11.DMT_NUM,
T1.TMSHT_RLTD_FLG,
T1.ROW_ID,
T10.NAME,
T18.CONSUMER_FLG,
T1.TARGET_PER_ID,
T18.FST_NAME,
T1.PRIV_FLG,
T3.PROVINCE,
T8.X_ALIS_ID,
T8.JOB_TITLE,
T14.NAME,
T1.NAME,
T1.PCT_COMPLETE,
T1.SRA_TYPE_CD,
T1.ALARM_FLAG,
T1.CAL_DISP_FLG,
T1.EVT_PRIORITY_CD,
T1.COST_CURCY_CD,
T2.LOC,
CONVERT (VARCHAR (10),T1.TODO_ACTL_START_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_ACTL_START_DT, 8),
T20.FILE_NAME,
T1.SRA_RESOLUTION_CD,
T6.PRDINT_ID,
T1.OWNER_LOGIN
FROM
dbo.S_EVT_ACT T1
LEFT OUTER JOIN dbo.S_ORG_EXT T2 ON T1.TARGET_OU_ID = T2.ROW_ID
LEFT OUTER JOIN dbo.S_ADDR_ORG T3 ON T2.PR_ADDR_ID = T3.ROW_ID
LEFT OUTER JOIN dbo.S_PRI_LST T4 ON T1.PRI_LST_ID = T4.ROW_ID
LEFT OUTER JOIN dbo.S_PRI_LST T5 ON T1.RATE_LST_ID = T5.ROW_ID
LEFT OUTER JOIN dbo.S_ACT_PRDINT T6 ON T1.ROW_ID = T6.ACTIVITY_ID
LEFT OUTER JOIN dbo.S_ADDR_PER T7 ON T1.TARGET_PER_ADDR_ID = T7.ROW_ID
LEFT OUTER JOIN dbo.S_CONTACT T8 ON T1.TARGET_PER_ID = T8.ROW_ID
LEFT OUTER JOIN dbo.S_EXP_RPT T9 ON T1.PR_EXP_RPT_ID = T9.ROW_ID
LEFT OUTER JOIN dbo.S_OPTY T10 ON T1.OPTY_ID = T10.ROW_ID
LEFT OUTER JOIN dbo.S_PART_RPR T11 ON T1.PART_RPR_ID = T11.ROW_ID
LEFT OUTER JOIN dbo.S_PROD_DEFECT T12 ON T1.SRA_DEFECT_ID = T12.ROW_ID
LEFT OUTER JOIN dbo.S_PROD_INT T13 ON T6.PRDINT_ID = T13.ROW_ID
LEFT OUTER JOIN dbo.S_PROJ T14 ON T1.PROJ_ID = T14.ROW_ID
LEFT OUTER JOIN dbo.S_SRC T15 ON T1.SRC_ID = T15.ROW_ID
LEFT OUTER JOIN dbo.S_SRV_REQ T16 ON T1.SRA_SR_ID = T16.ROW_ID
LEFT OUTER JOIN dbo.S_TMSHT_LINE T17 ON T1.PR_TMSHT_LINE_ID = T17.ROW_ID
LEFT OUTER JOIN dbo.S_CONTACT T18 ON T1.X_CLIENT_ID = T18.ROW_ID
LEFT OUTER JOIN dbo.S_CAMP_CON T19 ON T1.X_CAMP_ID = T19.SRC_ID AND T1.TARGET_PER_ID = T19.CON_PER_ID
LEFT OUTER JOIN dbo.S_ACTIVITY_ATT T20 ON T1.ROW_ID = T20.PAR_ROW_ID
WHERE
((T1.APPT_REPT_FLG != 'Y' OR T1.APPT_REPT_FLG IS NULL) AND
(T1.TEMPLATE_FLG != 'Y' AND T1.TEMPLATE_FLG != 'P' OR T1.TEMPLATE_FLG IS NULL)) AND
(T1.SRA_SR_ID = '1-EQLOO')
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Oct 12, 2006
I have a query that is taking too long to run. It take 14 seconds to return 6800 rows. However, if I move the query out of a stored proc, it takes 1 second. I want to understand this issue and ideally fix the stored proc case.
I've simplified my actual queries for readability.
-- @filter is value to filter against or NULL to return all records.
CREATE PROCEDURE queryPlayerStations(@filter INTEGER)
AS
SELECT * FROM MyTable
-- Other joins and query logic omitted for brevity
WHERE ((@filter IS NULL) OR (MyTable.Column = @filter))
GO
DECLARE @filter INTEGER
SET @filter = NULL
-- Takes 14 seconds to return 6800 rows. That's unacceptable performance
EXEC dbo.queryPlayerStations @filter
When I run the query directly in Query Analyzer, it runs very fast.
DECLARE @filter INTEGER
SET @filter = NULL
-- Takes ~1 second to return 6800 rows. That's great performance
SELECT * FROM MyTable
-- Other joins and query logic omitted for brevity
WHERE ((@filter IS NULL) OR (MyTable.Column = @filter))
When I put the parameters in the stored proc it runs fast.
CREATE PROCEDURE queryPlayerStations
AS
DECLARE @filter INTEGER
SET @filter = NULL
SELECT * FROM MyTable
-- Other joins and query logic omitted for brevity
WHERE ((@filter IS NULL) OR (MyTable.Column = @filter))
GO
-- Takes ~1 second to return 6800 rows. That's great performance
EXEC dbo.queryPlayerStations
Anyone have any ideas what I can do to improve the stored proc case?
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Mar 27, 2008
Hi guys/gals
I have only just signed up, as I have a problem thats confusing me a lot
I have a page (classic asp - sadly) that displays a list of invoices for a certain customer
Each of these customers has fairly complex permissions system, but the page generates a list of invoices and values in 0.01 seconds
However in the while...do loop, for each invoice it checks a database table for "extra charges"..
This is a simple SQL query
"Select Sum(amount) from extra_charges where invoice_number=" & current_invoice_number
However each time it runs this simple select statement it takes 2 seconds - which causes the page to load in 70 seconds instead of 0.01
I am absolutely beyond confused. I have tried it in a stored procedure, and a direct ado query..
The table by the way is empty on my current test system, and one one other system has about 150 records in it. Both take the same time
Any help would be appreciated?
This is a MSSQL 2000 database I've inherited, I am usually a PHP/MYSQL developer - so im a little out of my field of expertise here
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May 26, 2004
i want to have a like search in the following query.
SELECT DISTINCT TOP 200 a.AccountID,
a.AccountNumber,
c.CLI,
con.SurName,
addr.Address1 [Account Address],
addr.Postcode as [Account Postcode],
atp.Name AS Type,
cs.Code AS Status
FROM account_t a
INNER JOIN customer_t cust on a.customerID = cust.CustomerID
INNER JOIN AccountType_T atp on cust.AccountTypeID = atp.AccountTypeID
INNER JOIN CustomerStatus_T cs ON a.CustomerStatusID = cs.CustomerStatusID
INNER JOIN Contacts_T con on cust.MasterContactID = con.ContactID
INNER JOIN Address_T addr ON cust.MasterAddressID = addr.AddressID
LEFT OUTER JOINCLI_T c ON a.AccountID = c.AccountID
WHERE (c.CLI LIKE @CLI + '%')
AND (con.SurName LIKE @Surname + '%')
AND (addr.Address1 LIKE @Address + '%')
AND (REPLACE(addr.Postcode, ' ', '') LIKE @Postcode + '%')
AND c.DateArchived IS NULL
here all fields @CLI, @Surname, @Address, @Postcode are varhcar types...which is making this query very slow...is there any suggestion to improve this query?
thanks in advance
bhavya
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Mar 18, 2008
When I want to display the total records (#) in a webpage, it is very slow. When I try to remove the total records and show them per 20s, it responds very fast.
Any ideas?
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Sep 13, 2006
What might be going on here? The Query is against a single table withsome criteria. The database is active with upto 200 connected usersand at peak times there are 10 or more active sessions. Most of thetime, the query comes back in milliseconds. Occasionally though, it itcan take a whole minute. I've been watching CPU, Memory, Disk. Noneof these appear to be the bottlenecking. (CPU usually below 10% andalways below 50%, pages/sec is 0, and disk % is low and does notspikes during hangs) I also checked to see if hangs were synching withTlog backups or other scheduled jobs, but that is not the case. Thebox has good hardware 4GB RAM and 2 CPU at 3.4 GHz. What could beholding this query up?Thanks for any ideas.Dave
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Jul 20, 2005
This UNION query is very slow. With only 3,000 records in the Parent tableand 7,000 records in the Child table, it takes about 60 seconds to run andreturns about 2200 records.Any ideas on speeding it up? Thanks.-- PART 1: HAS NO CHILD RECORDSSELECT P.PROJECT_ID, 'No Child Data' AS SUB_TYPEFROM PROJECTS P LEFT JOIN PROJECTS_CHILDREN CON P.PROJECT_ID = C.PROJECT_IDWHERE P.PROJECT_ID IS NULLUNION-- PART 2: HAS CHILD RECORDS, BUT NOT OF TYPE ZSELECT PROJECT_ID, 'Child Data, Not type Z' AS SUB_TYPEFROM PROJECTSWHERE PROJECT_ID NOT IN((SELECT PROJECT_IDFROM PROJECTS_CHILDRENWHERE CHILD_TYPE Like "Z*")ANDPROJECT_ID NOT IN (SELECT P.PROJECT_IDFROM PROJECTS P LEFT JOIN PROJECTS_CHILDREN CON P.PROJECT_ID = C.PROJECT_IDWHERE P.PROJECT_ID IS NULL));
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Jul 20, 2005
Excuse me in advance fo my little English.I've got this stored procedure************************************************** ************************************declare @Azienda as varchar(3), @Utente as varchar(20),@DataDa as datetime, @DataA as datetime,@AreaDa as varchar(3), @AreaA as varchar(3),@LineaDa as varchar(3), @LineaA as varchar(3),@TipoDa as varchar(3), @TipoA as varchar(3),@FamigliaDa as varchar(3), @FamigliaA as varchar(3),@ProdottoDa as varchar(20), @ProdottoA as varchar(20),@AgenteDa as varchar(4), @AgenteA as varchar(4),@NazioneDa as varchar(50), @NazioneA as varchar(50),@ZonaDa as Varchar(3), @ZonaA as Varchar(3),@ProvinciaDa as varchar(2), @ProvinciaA as varchar(2),@ClienteDa as Varchar(12), @ClienteA as Varchar(12),@DestinDa as varchar (5), @DestinA as varchar (5),@TipoDestinDa as varchar(1), @TipoDestinA as varchar(1),@FlagProdNoTarget as varchar(5),@GrAcqDa as varchar(10), @GrAcqA as varchar(10),@TipoCliDa as varchar(3), @TipoCliA as varchar(3),@SettMercDa as varchar(3), @SettMercA as varchar(3)Set @Azienda = '900'Set @Utente = 'Eugenio'Set @DataDa = '2004-01-01'Set @DataA = '2004-01-10'Set @AreaDa = 'UNI'Set @AreaA = 'UNI'Set @LineaDa = ''Set @LineaA = 'ZZZ'Set @TipoDa = ''Set @TipoA = 'ZZZ'Set @FamigliaDa = ''Set @FamigliaA = 'ZZZ'Set @ProdottoDa = ''Set @ProdottoA = 'ZZZZZZZZZZZZZZZZZZZZ'Set @AgenteDa = ''Set @AgenteA = 'ZZZZ'Set @NazioneDa = ''Set @NazioneA = 'ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ ZZ'Set @ZonaDa = ''Set @ZonaA = 'ZZZ'Set @ProvinciaDa = ''Set @ProvinciaA = 'ZZ'Set @ClienteDa = ''Set @ClienteA = 'ZZZZZZZZZZZZ'Set @DestinDa = ''Set @DestinA = 'ZZZZZ'Set @TipoDestinDa = ''Set @TipoDestinA = 'Z'Set @FlagProdNoTarget = 'Vero'Set @GrAcqDa = ''Set @GrAcqA = 'ZZZZZZZZZZ'Set @TipoCliDa = ''Set @TipoCliA = 'ZZZ'Set @SettMercDa = ''Set @SettMercA = 'ZZZ'Select WSDFR.AreaCommerciale,WSDFR.Agente,WSDFR.NazDestin,WSDFR.ZonaDestin,WSDFR.ProvDestin,WSDFR.Cliente,WSDFR.DescrCliente,WSDFR.GruppoAcq,WSDFR.TipoCli,WSDFR.SettMerc,WSDFR.CDestin,WSDFR.DescrDestin,WSDFR.TipoDestin,WSDFR.EsclStatis,WSDFR.EsclTarget,WSDFR.ValoreNetto,WSDFR.TpDocum,WSDFR.VCambioITL,WSDFR.VCambioEUR,WSDFR.MeseFatt,WSDFR.PosizioneFrom W_St_DocFatt_Righe WSDFRinner join UniP_Prodotti UPP onWSDFR.prodotto=UPP.CodWhere WSDFR.Dtdocum between @DataDa and @DataA andWSDFR.AreaCommerciale between @AreaDa and @AreaA andWSDFR.LineaProdotto between @LineaDa and @LineaA andWSDFR.TipoProdotto between @TipoDa and @TipoA andWSDFR.FamigliaProdotto between @FamigliaDa and @FamigliaA andWSDFR.Prodotto between @ProdottoDa and @ProdottoA andWSDFR.Agente between @AgenteDa and @AgenteA************************************************** **************************************************"W_St_DocFatt_Righe" is a view.This query run on my SQL7 server and it takes about 10 seconds.This query exists on another SQL7 server and until last week it took about10 seconds.The configuration of both servers are same. Only the hardware is different.Now, on the second server this query takes about 30 minutes to extract the same details, but anybody has changed any details.If I execute this query without Where, it'll show me the details in 7seconds.This query still takes about same time if Where isWhere WSDFR.Dtdocum between @DataDa and @DataA andWSDFR.AreaCommerciale between @AreaDa and @AreaA andWSDFR.LineaProdotto between @LineaDa and @LineaA and--WSDFR.TipoProdotto between @TipoDa and @TipoA and--WSDFR.FamigliaProdotto between @FamigliaDa and @FamigliaA andWSDFR.Prodotto between @ProdottoDa and @ProdottoA andWSDFR.Agente between @AgenteDa and @AgenteAorWhere WSDFR.Dtdocum between @DataDa and @DataA andWSDFR.AreaCommerciale between @AreaDa and @AreaA and--WSDFR.LineaProdotto between @LineaDa and @LineaA and--WSDFR.TipoProdotto between @TipoDa and @TipoA andWSDFR.FamigliaProdotto between @FamigliaDa and @FamigliaA andWSDFR.Prodotto between @ProdottoDa and @ProdottoA andWSDFR.Agente between @AgenteDa and @AgenteAorWhere WSDFR.Dtdocum between @DataDa and @DataA andWSDFR.AreaCommerciale between @AreaDa and @AreaA and--WSDFR.LineaProdotto between @LineaDa and @LineaA and--WSDFR.TipoProdotto between @TipoDa and @TipoA and--WSDFR.FamigliaProdotto between @FamigliaDa and @FamigliaA and--WSDFR.Prodotto between @ProdottoDa and @ProdottoA andWSDFR.Agente between @AgenteDa and @AgenteAIt is a real puzzle!What happen?Is there someone that had such as problems and have the right solution?Thanks in advance.ByeEugenio
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Apr 17, 2008
Is there a more efficient way to write this query? It takes 2 minutes and 15 seconds to run against 200,000 records.
UPDATE Tbl_a
SET Flag = NULL
WHERE Flag = 1 And Not Exists(Select Id From Upload
Where Tbl_a.Id = Upload.Id)
thanks,
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Feb 29, 2008
How can i delete my old threads from Mythreads.
Any Body
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Feb 5, 2008
Hi all.I want to use the following query in a sp to enable paging using ObjectDataSource.The problem (being EXTREMELEY slow) arises when I add these joins and where statements.
SELECT r.RID AS ReqID, r.Name AS ReqName, r.Family AS ReqFamily,t3.Name AS DistName, t4.Name AS RurName,t5.Name AS VilName, n.Name+' '+n.Family AS NazerName ,ROW_NUMBER() over (order by r.Family) AS RowRankFROM Requests rLEFT OUTER JOIN Nazeran n ON r.nazerID = n.ID LEFT OUTER JOIN t1States t1 ON t1.ID = r.StateID LEFT OUTER JOIN t2Provinces t2 ON t1.ID = t2.StateID AND r.ProvID = t2.ID LEFT OUTER JOIN t3Districts t3 ON t2.ID = t3.provID AND t1.ID = t3.stateID AND r.DistID = t3.ID LEFT OUTER JOIN t4RuralDistricts t4 ON t3.ID = t4.distID AND t2.ID = t4.provID AND t1.ID = t4.stateID AND r.RurID = t4.ID LEFT OUTER JOIN t5Villages t5 ON t4.ID = t5.rurID AND t3.ID = t5.distID AND t2.ID = t5.provID AND t1.ID = t5.stateID AND r.VilID = t5.IDWHERE r.stateid=(case when @StateID is null or @StateID='' then r.stateid else @StateID end) and r.provid=(case when @provID is null or @provID='' then r.provid else @provID end) and r.rID=(case when @ReqID is null or @ReqID='' then r.rID else @ReqID end) and isnull(r.nazerID,'')=(case when @nazerID is null or @nazerID='' then isnull(r.nazerID,'') else @nazerID end) and r.name+' '+r.family like (case when @ReqName is null or @ReqName='' then r.name+' '+r.family else '%'+@ReqName+'%' end)
**there are 1million rows in [Requests] table ,200000 rows in [t5villages], and about total 5000 rows in other tables.As you can see, this is for a GridView showing list of people requesting a loan allowing users to make alternative searches based on Name, Familyname ,ID ,...
would you please help me optimize and make fast this query.Many thanks..
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Feb 19, 2008
Hai i use Sql Server 2000 today i got this problem
when i execute "select * from service_db" some times it is executed successfully but most of times the query on execution continusly
why this happen how to solve this pbm very urgent
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Dec 2, 2003
Hi all,
I have sql query to search for fields in a rather big view. If I execute the
query in sql server enterprise manager, the results will be displayed in
less than 6 seconds. However, if I execute it using asp.net, it will take
very long (more than 2 minutes).
The query is a simple one like "SELECT * FROM myview WHERE name LIKE
'%Microsoft%'". And the code I use to execute it in asp.net is
Dim dsRtn As DataSet
Dim objConnection As OleDbConnection
Try
objConnection = GetOleDbConnection()
objConnection.Open()
Dim objDataAdapter As New OleDbDataAdapter(strSearch, objConnection)
Dim objDataSet As New DataSet()
objDataAdapter.Fill(objDataSet, strTableName)
dsRtn = objDataSet
Catch ex As Exception
dsRtn = Nothing
Finally
If objConnection.State = ConnectionState.Open Then
objConnection.Close()
End If
End Try
Where strSearch is the sql search string.
I don't have any problem using such code for other queries.
Could somebody suggest the cause of the problem and how to solve it? Thanks!
Best regards,
David
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Jul 1, 2004
Hi,
I am having a query where I am connecting to eight different tables using joins. When I join one table to another the speed of the execution becomes less. Even on my local server it is taking nearly 2 to 3 minutes to execute the query. How can I increase the speed of execution of my query.
Thanks in advance,
Uday
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Mar 6, 2002
This queries performance is acceptable (about 1 second) when run like this:
SELECT a.f1,a.f2,b.ff1,b.ff2 FROM table1 a LEFT OUTER JOIN table2 b ON a.id = b.id AND b.ff3 = 'T'
WHERE a.mydate BETWEEN '3/4/2002' AND '3/6/2002' AND b.ff4 = 'somevalue'
It is terrible (60 seconds) when run like this:
SELECT a.f1,a.f2,b.ff1,b.ff2 FROM table1 a LEFT OUTER JOIN table2 b ON a.id = b.id AND b.ff3 = 'T'
WHERE b.mydate BETWEEN '3/4/2002' AND '3/6/2002' AND b.ff4 = 'somevalue'
I need the date range to come from the b.maydate. The field is indexed. If I run another query directy on table2 b without a JOIN and using b.mydate for some daterange it is quite fast. Any idea how to speed this up?
Thanks,Adrian
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Aug 12, 2006
Please help me out:
It is textremely slow when I run a query in My SQL Server 2000 Query Analyzer on my laptop. But when I turn off the wireless card on the laptop, the query runs instantly.
Could you please tell me how can I make the server running faster when my computer is connected to the internet?
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Mar 25, 2004
tblElements.ID is a foreign key to tblOwner.eID
@PrevRec = dynamic number of previous records
@owner = owner ID
SELECT TOP 2 tblOwner.eID FROM tblOwner
LEFT JOIN tblElements ON
tblElements.ID = tblOwner.eID
WHERE tblOwner.own_ID = @Owner AND tblElements.ID NOT IN
(SELECT TOP + @PrevRec + tblOwner.eID FROM tblOwner
LEFT JOIN tblElements ON
tblElements.ID = tblOwner.eID WHERE tblOwner.own_ID = @Owner) ORDER BY tblOwner.eID ASC
This query is used to display one record per page on a ASP paging script, I select top 2 because, I want to be able to know if I have another page or record to go to and deside if I need to display the "Next" button.
Also It is suppose to select records only assigned to it's ower.
It works fairly quick when viewing first few hundred records, then it takes a very long time.
I have indexed ID and eID as clustered indexes also tblOwner could have multiple instances eID.
Is there an easier way of writing this out.
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