Query Slow On Client, Fast On Server
Feb 15, 2006
I have a very unusual situation - we converted a client from DB2 7.2 to MS SQL Server 2000, SP3. There is one report that runs very quickly when ran on the Database Server, but it takes a long time to complete when it is ran from a client system. This query is ran from within the application and not from within Query Analyzer.
Has anyone else here ever encountered this issue? What did it turn out to be? I am leaning away from it being a network issue.
Thanks in advance.
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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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Apr 2, 2008
I'm trying to figure out how to determine why the same database is fast on my desktop but slow on a robust multiprocessor win2003 server.
I have a complex proc that takes about 27 seconds on my desktop sql server but takes almost 5 minutes on the server. The server processors are running at about 1% utilization while the proc is running.
Any ideas on how to troubleshoot this extremely poor performance?
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Sep 20, 2007
I have a package which completes in 3 minutes when ran from Visual Studio but when deployed to SSIS (same machine) it rans for more than 2 hours. What could be the reason for this?
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Aug 14, 2001
In an ASP, I have a dynamically created SQL statement that amounts to "SELECT * FROM Server1.myDB.dbo.myTable WHERE Col1 = 1" (Col1 is the table's primary key). It returns the data immediately when executed.
However, when the same record is updated with "UPDATE Server1.myDB.dbo.myTable SET Comments = 'blah blah blah' WHERE Col1 = 1", the page times out before the query can complete.
I watched the program in Profiler, and I saw on the update that sp_cursorfetch was being executed as an RPC once per each row in the table. In a table of 78000 records, the timeout occurs well before the last record is fetched, and the update bombs.
I can run the same statements in Query Analyzer from a linked server and have the same results. The execution plan shows that a Remote Query is occurring on the select that returns 1 row, and a Remote Scan is taking place on the update scanning 78000 rows (I guess this is where all the sp_cursorfetch calls are happening...?).
How can I prevent the Remote Scan? How can I prevent the execution of the RPC sp_cursorfetch for each row in the remote table?
Thank you!
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Apr 23, 2008
Performance issue.
I have a very complex Stored Procedure called by a Job that is Scheduled to run every night.
It's execution takes sometimes 1 or 2 hours and sometimes 7 hours or more.
So, if it is running for more than 4 hours I stop the Job and I run the procedure from a Query Window and it never takes more than 2 hours.
Can anyone help me identify the problem ? I want to run from the Job and not to worry about it.
Some more information:
- It is SQL 2000 Enterprise with SP4 in a Cluster (It happens the same way in any node).
- The SQL Server and SQL Agent services run using a Domain Account that have full Administrative access.
- When I connect to a Query Window I also use a Windows Account.
- There is no locks or process bloking or being blocked while the job is running.
- Using the Task Manager the processor activity is ok, no more than 30 % in any processor.
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Oct 16, 2005
I have a very puzzling situation with a database. It's an Access 2000 mdbwith a SQL 7 back end, with forms bound using ODBC linked tables. At ourremote location (accessed via a T1 line) the time it took to go to a recordwas very slow. The go to mechanism was a box that the user typed the indexvalue into a combo box, with very simple code attached:with me.RecordsetClone.FindFirst "[Index] = " & me.cboGoToIf Not .NoMatch ThenMe.Bookmark = .BookmarkEnd Ifend withNow, one would say that going to a record is slow because I'm using..FindFirst over a T1 line. And that's what I thought. However, as I wasworking with the form, commenting out various sections not related to the GoTo, I found that the Go To functionality changed, though I didn't modify thecode.Previously, going to a record near the end of the 50,000 record recordsettook about 1-2 seconds, but going to a record near the beginning, took about20 seconds. After the form changed, going to any record in the recordsettook about 1-2 seconds.So the question remains: why did it take so long to go to a record near thebeginning of the recordset, but not near the end (and the ones in the middletook an amount of time about halfway between the two), and what changed sothat now the form is working fine for all records?I've compared the changed form with the previous copy, and I don't see anydifferences. I've compared all code in the form module, and I've comparedall form properties. The forms are identical as far as I could tell. Butsomething happened as I was commenting/uncommenting code in the form thatgot rid of the problem with it taking a long time to go to some of therecords.My first thought was that something got recompiled, and now the form isfast. So I went back to the original version and changed some code andrecompiled, also did a compact and repair. But it was still slow. I alsotried doing an explicit decompile and then recompiled it. But it was stillslow.So this is very frustrating that the form is now working fine, but I can'tsee anything that's changed. If I don't see why the form is now fast, thenthere's no reason to believe that it might not at some point go back tobeing slow again. And then I'd just have to hope that something changes. Itwould be good to figure this out.Any ideas as to what might have changed here to cause the form's Go To to befast would be appreciated.Thanks,Neil
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Oct 10, 2006
I have created an integration services package with a script-source reading data from Active directory. Pretty much data is read and written into a sql2005 database.
I have notised that when I run the package via right-clicking the package (Under stored packagesMSDB) and selecting "Run Package" it takes about 45 minutes for it to complete successfully. The same goes if I run the package from inside Visual Studio. However, when I create a job and put this package as one of it's tasks the task takes about 1h 40min. This is more then double the time! In neither case the server is occupied with soething else. And I have tried it several times so it wasn't just an "accident".
Any idéa of what this depends on?
regards Andreas
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Jul 29, 2005
Hi!
we've got a curious problem. we've two identicall databases, same tables, same date, same indexes, same server, both replicated.
One of them is our life database and the other is our development database. If I execute the following query at the development database the query takes less then one second. If I execute the same query at the live database the query takes about 4 seconds to complete. This is very unsatisfactory!!
What I've noticed is, if I try to analyze the query in the tuning advisor on the developement database it completes without tuning tips. If I do the same on the live database I get the following error:
TITLE: DTAEngine
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Nov 2, 2007
Hi,
I have a query that takes 15minutes to run the first time after sql server start but then for subsequent querys is superfast (less than 10 secs).
Why? What could I do to speed up the first run?
Here is the source:
Code Block
SELECT Articoli.Articolo, Articoli.BarCodeVen, Articoli.Descri, Articoli.Merce, Articoli.CodIVA, Articoli.UMBase, Articoli.PrzBase, Articoli.Sconto1, Articoli.Sconto2,
Articoli.ScontoFormula, Articoli.Ricarico, Articoli.TipoArt, Articoli.CatMerc, Articoli.CatOmo, Articoli.CatProvv, Articoli.CntrprtVen, Articoli.CntrprtAcq,
Articoli.Dispniblta, Articoli.Vendita, Articoli.SiCli, Articoli.SiFor, Articoli.NotaPriv, Articoli.NotaPubb, Articoli.Immagine, Articoli.Produttore, Articoli.SiMatr,
Articoli.OldCodArt, Articoli.Disattivo, Articoli.CatProd, Articoli.SotCatProd, Articoli.EsplKit, Articoli.ScaricoCom, Articoli.ImmagLun, Articoli.DataModCS,
Articoli.ValorizPr, Articoli.Natura, Articoli.UMSecScelta, Articoli.SecScelta, Articoli.Acquisto, Articoli.CntConsumi, Articoli.NonMovimentabile,
Articoli.ProvAgente, Articoli.Taglia, Articoli.Colore, Articoli.CodArtNeutro, Articoli.Collezione, Articoli.Assortimento, Articoli.Centro,
Articoli.InibisciRicercaUnMis, Articoli.Commessa, Articoli.DescriTesto, Articoli.Disattivabile, Articoli.KwTipoArt, Articoli.KwTipoArtNeutro,
Articoli.KwNeutro, Articoli.KwCollezione, Articoli.KwLinea, Articoli.KwModello, Articoli.KwMateriale, Articoli.KwComposizione, Articoli.KwPosRiga,
Articoli.KwVarRiga, Articoli.KwPosColonna, Articoli.KwVarColonna, Articoli.KwPos3D, Articoli.KwVar3D, Articoli.KwGrpVarRiga, Articoli.KwGrpVarColonna,
Articoli.KwGrpVar3D, Articoli.KwEtiMan, Articoli.KwAssortimento, Articoli.KwGrpFormule, Articoli.KwSpecimen, KwVarArticolo.TipoVariante,
KwVarArticolo.Variante, KwVarArticolo.Posizione, KwVarArticolo.Categoria, KwVarArticolo.DescriVariante,
KwVarArticolo.P07009Descrizione1 AS Descrizione1, KwVarArticolo.P07009Descrizione2 AS Descrizione2, CatOmo.Descri AS CatOmoDescri,
KwModelli.Descri AS DescriModello, KwMateriali.Descri AS DescriMateriale, MFDBCompon_Tomaia2.DatoTecnico,
MFDBCompon_Tomaia2.DBPosColonna, MFDBCompon_Tomaia2.DBPos3D, MFDBCompon_Tomaia2.CompNeutro,
MFDBCompon_Tomaia2.CompVarRiga, Articoli_1.Descri AS DescriCompNeutro, MFKwVariantiRiga.DescriVariante AS DescriRigaCompo,
CatProvv.Descri AS CatProvvDescri, MFDBCompon_Tomaia3.CompNeutro AS CompNeutroT3,
MFDBCompon_Tomaia3.CompVarRiga AS CompVarrigaT3, Articoli_2.Descri AS DescriCompNeutroT3,
MFKwVariantiRiga_1.DescriVariante AS DescriRigaCompoT3, MFDBCompon_Acc1.CompNeutro AS CompNeutroAcc1,
MFDBCompon_Acc1.CompVarRiga AS CompVarRigaAcc1, Articoli_3.Descri AS DescriCompNeutroAcc1,
MFKwVariantiRiga_2.DescriVariante AS DescriRigaCompoAcc1, MFDBCompon_Acc2.CompNeutro AS CompNeutroAcc2,
MFDBCompon_Acc2.CompVarRiga AS CompVarRigaAcc2, Articoli_4.Descri AS DescriCompNeutroAcc2,
MFKwVariantiRiga_3.DescriVariante AS DescriRigaCompoAcc2, MFDBCompon_SottoP_Tallonet.CompNeutro AS CompNeutroSottop,
MFDBCompon_SottoP_Tallonet.CompVarRiga AS CompVarRigaSottop, MFDBCompon_SottoP_Tallonet.DescriCompNeutroSottop,
MFDBCompon_SottoP_Tallonet.DescriRigaCompoSottop, MFDBCompon_SottoP_Tallonet.DatoTecnico AS DatoTecnicoSottop,
MFDBCompon_RicSol.CompNeutro AS CompNeutroRicSol, MFDBCompon_RicSol.CompVarRiga AS CompVarRigaRicSol,
MFDBCompon_RicSol.DescriCompNeutroRicSol, MFDBCompon_RicSol.DescriRigaCompoRicSol,
MFDBCompon_Fodera.CompNeutro AS CompNeutroFodera, MFDBCompon_Fodera.CompVarRiga AS CompVarRigaFodera,
MFDBCompon_Fodera.DescriCompNeutroFodera, MFDBCompon_Fodera.DescriRigaCompoFodera, MFDBCompon_Forma.Descri AS DescriForma,
MFDBCompon_Tacco.Descri AS DescriTacco, MFVar3D_Pos1.DescriVariante AS Descri_Pos1, MFVar3D_Pos2.DescriVariante AS Descri_Pos2,
MFVar3D_Pos3.DescriVariante AS Descri_Pos3, MFVar3D_Pos4.DescriVariante AS Descri_Pos4, MFListinoP00New.Prz AS P00,
MFListinoP00New.InVigoreDa AS DataP00, MFListinoP05New.Prz AS P05, MFListinoP05New.InVigoreDa AS DataP05, MFListinoPUSANew.Prz AS PUSA,
MFListinoPUSANew.InVigoreDa AS DataPUSA,
CASE WHEN KwVarArticolo.P07009Descrizione2 <> '' THEN KwVarArticolo.P07009Descrizione2 ELSE CASE WHEN Articoli.CatProvv = '30SPORT' THEN Articoli.KwNeutro
+ KwVarArticolo.Variante + '.jpg' ELSE Articoli.KwNeutro + '.jpg' END END AS MFFoto, MFListinoRUSANew.Prz AS RUSA,
MFListinoRUSANew.InVigoreDa AS DataRUSA, MFListinoRITANew.Prz AS RITA, MFListinoRITANew.InVigoreDa AS DataRITA, ArtMerce.Fornitore
FROM Articoli INNER JOIN
KwVarArticolo ON Articoli.Articolo = KwVarArticolo.Articolo INNER JOIN
CatOmo ON Articoli.CatOmo = CatOmo.Categoria INNER JOIN
KwMateriali ON Articoli.KwModello = KwMateriali.KwModello AND Articoli.KwMateriale = KwMateriali.KwMateriale INNER JOIN
KwModelli ON Articoli.KwModello = KwModelli.KwModello AND Articoli.KwMateriale = KwModelli.KwMateriale LEFT OUTER JOIN
ArtMerce ON Articoli.Articolo = ArtMerce.Articolo LEFT OUTER JOIN
MFListinoRUSANew ON KwVarArticolo.Variante = MFListinoRUSANew.VarRiga AND Articoli.KwNeutro = MFListinoRUSANew.Neutro LEFT OUTER JOIN
MFListinoRITANew ON KwVarArticolo.Variante = MFListinoRITANew.VarRiga AND Articoli.KwNeutro = MFListinoRITANew.Neutro LEFT OUTER JOIN
MFListinoPUSANew ON KwVarArticolo.Variante = MFListinoPUSANew.VarRiga AND Articoli.KwNeutro = MFListinoPUSANew.Neutro LEFT OUTER JOIN
MFListinoP05New ON KwVarArticolo.Variante = MFListinoP05New.VarRiga AND Articoli.KwNeutro = MFListinoP05New.Neutro LEFT OUTER JOIN
MFListinoP00New ON Articoli.KwNeutro = MFListinoP00New.Neutro AND KwVarArticolo.Variante = MFListinoP00New.VarRiga LEFT OUTER JOIN
MFVar3D_Pos4 ON Articoli.KwNeutro = MFVar3D_Pos4.Articolo LEFT OUTER JOIN
MFVar3D_Pos3 ON Articoli.KwNeutro = MFVar3D_Pos3.Articolo LEFT OUTER JOIN
MFVar3D_Pos2 ON Articoli.KwNeutro = MFVar3D_Pos2.Articolo LEFT OUTER JOIN
MFVar3D_Pos1 ON Articoli.KwNeutro = MFVar3D_Pos1.Articolo LEFT OUTER JOIN
MFDBCompon_Forma ON KwVarArticolo.Variante = MFDBCompon_Forma.DBVarRiga AND
Articoli.Articolo = MFDBCompon_Forma.DBNeutro LEFT OUTER JOIN
MFDBCompon_Tacco ON KwVarArticolo.Variante = MFDBCompon_Tacco.DBVarRiga AND
Articoli.Articolo = MFDBCompon_Tacco.DBNeutro LEFT OUTER JOIN
MFDBCompon_Fodera ON KwVarArticolo.Variante = MFDBCompon_Fodera.DBVarRiga AND
Articoli.KwNeutro = MFDBCompon_Fodera.DBNeutro LEFT OUTER JOIN
MFDBCompon_RicSol ON KwVarArticolo.Variante = MFDBCompon_RicSol.DBVarRiga AND
Articoli.KwNeutro = MFDBCompon_RicSol.DBNeutro LEFT OUTER JOIN
MFDBCompon_SottoP_Tallonet ON KwVarArticolo.Variante = MFDBCompon_SottoP_Tallonet.DBVarRiga AND
Articoli.KwNeutro = MFDBCompon_SottoP_Tallonet.DBNeutro LEFT OUTER JOIN
MFDBCompon_Acc2 INNER JOIN
Articoli AS Articoli_4 ON MFDBCompon_Acc2.CompNeutro = Articoli_4.Articolo INNER JOIN
MFKwVariantiRiga AS MFKwVariantiRiga_3 ON MFDBCompon_Acc2.CompVarRiga = MFKwVariantiRiga_3.Variante ON
KwVarArticolo.Variante = MFDBCompon_Acc2.DBVarRiga AND Articoli.KwNeutro = MFDBCompon_Acc2.DBNeutro LEFT OUTER JOIN
MFDBCompon_Acc1 INNER JOIN
Articoli AS Articoli_3 ON MFDBCompon_Acc1.CompNeutro = Articoli_3.Articolo INNER JOIN
MFKwVariantiRiga AS MFKwVariantiRiga_2 ON MFDBCompon_Acc1.CompVarRiga = MFKwVariantiRiga_2.Variante ON
KwVarArticolo.Variante = MFDBCompon_Acc1.DBVarRiga AND Articoli.KwNeutro = MFDBCompon_Acc1.DBNeutro LEFT OUTER JOIN
MFDBCompon_Tomaia3 INNER JOIN
Articoli AS Articoli_2 ON MFDBCompon_Tomaia3.CompNeutro = Articoli_2.Articolo INNER JOIN
MFKwVariantiRiga AS MFKwVariantiRiga_1 ON MFDBCompon_Tomaia3.CompVarRiga = MFKwVariantiRiga_1.Variante ON
KwVarArticolo.Variante = MFDBCompon_Tomaia3.DBVarRiga AND Articoli.KwNeutro = MFDBCompon_Tomaia3.DBNeutro LEFT OUTER JOIN
CatProvv ON Articoli.CatProvv = CatProvv.Categoria LEFT OUTER JOIN
Articoli AS Articoli_1 INNER JOIN
MFDBCompon_Tomaia2 ON Articoli_1.Articolo = MFDBCompon_Tomaia2.CompNeutro INNER JOIN
MFKwVariantiRiga ON MFDBCompon_Tomaia2.CompVarRiga = MFKwVariantiRiga.Variante ON
KwVarArticolo.Variante = MFDBCompon_Tomaia2.DBVarRiga AND Articoli.KwNeutro = MFDBCompon_Tomaia2.DBNeutro
WHERE (Articoli.KwCollezione = @KwCollezione) AND (Articoli.KwLinea = @KwLinea) AND (KwVarArticolo.TipoVariante = 52559872) AND
(Articoli.CatProvv IN (@CatProvv)) AND (Articoli.Disattivo = '0') AND (KwVarArticolo.Disattivo = '0') AND (ArtMerce.Fornitore IN (@Fornitore)) OR
(Articoli.KwCollezione = @KwCollezione) AND (Articoli.KwLinea = @KwLinea) AND (KwVarArticolo.TipoVariante = 52559872) AND
(Articoli.CatProvv IN (@CatProvv)) AND (Articoli.Disattivo = '0') AND (KwVarArticolo.Disattivo = '0') AND ('ALL' IN (@Fornitore)) OR
(Articoli.KwCollezione = @KwCollezione) AND (Articoli.KwLinea = @KwLinea) AND (KwVarArticolo.TipoVariante = 52559872) AND (Articoli.Disattivo = '0')
AND (KwVarArticolo.Disattivo = '0') AND (ArtMerce.Fornitore IN (@Fornitore)) AND ('ALL' IN (@CatProvv)) OR
(Articoli.KwCollezione = @KwCollezione) AND (Articoli.KwLinea = @KwLinea) AND (KwVarArticolo.TipoVariante = 52559872) AND (Articoli.Disattivo = '0')
AND (KwVarArticolo.Disattivo = '0') AND ('ALL' IN (@CatProvv)) AND ('ALL' IN (@Fornitore))
ORDER BY Articoli.CatProvv, Articoli.CatOmo, Articoli.Articolo, KwVarArticolo.Posizione
Thank you!
Roberto
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Mar 29, 2006
I'm trying to work out a database design to make it quicker for my clientprogram to read and display updates to the data set. Currently it reads inthe entire data set again after each change, which was acceptable when thedata set was small but now it's large enough to start causing noticabledelays. I've come up with a possible solution but am looking for others'input on its suitability to the problem.Here is the DDL for one of the tables:create table epl_packages(customer varchar(8) not null, -- package_type char not null, -- primary keypackage_no int not null, -- /dimensions varchar(50) not null default(0),weight_kg int not null,despatch_id int, -- filled in on despatchloaded bit not null default(0),item_count int not null default(0))alter table epl_packagesadd constraint pk_epl_packagesprimary key (customer, package_type, package_no)My first thought was to add a datetime column to each table to record thetime of the last change, but that would only work for inserts and updates.So I figured that a separate table for deletions would make this complete.DDL would be something like:create table epl_packages(customer varchar(8) not null,package_type char not null,package_no int not null,dimensions varchar(50) not null default(0),weight_kg int not null,despatch_id int,loaded bit not null default(0),item_count int not null default(0),last_update_time datetime default(getdate()) -- new column)alter table epl_packagesadd constraint pk_epl_packagesprimary key (customer, package_type, package_no)create table epl_packages_deletions(delete_time datetime,customer varchar(8) not null,package_type char not null,package_no int not null)And then these triggers on update and delete (insert is handled automaticallyby the default constraint on last_update_time):create trigger tr_upd_epl_packageson epl_packagesfor updateas-- check for primary key changeif (columns_updated() & 1792) > 0 -- first three columns: 256+512+1024insert epl_packages_deletionsselectgetdate(),customer,package_type,package_nofrom deletedupdate Aset last_update_time = getdate()from epl_packages Ajoin inserted Bon A.customer = B.customer andA.package_type = B.package_type andA.package_no = B.package_nogocreate trigger tr_del_epl_packageson epl_packagesfor deleteasinsert epl_packages_deletionsselectgetdate(),customer,package_type,package_nofrom deletedgoThe client program would then do the initial read as follows:select getdate()selectcustomer,package_type,package_no,dimensions,weight_kg,despatch_id,loaded,item_countfrom epl_packageswherecustomer = {current customer}order bycustomer,package_type,package_noIt would store the output of getdate() to be used in subsequent updates,which would be read from the server as follows:select getdate()selectcustomer,package_type,package_no,dimensions,weight_kg,despatch_id,loaded,item_countfrom epl_packageswherecustomer = {current customer} andlast_update_time > {output of getdate() from previous read}order bycustomer,package_type,package_noselectcustomer,package_type,package_nofrom epl_packages_deletionswherecustomer = {current customer} anddelete_time > {output of getdate() from previous read}The client program will then apply the deletions and the updated/insertedrows, in that order. This would be done for each table displayed in theclient.Any critical comments on this approach and any improvements that couldbe made would be much appreciated!
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Jul 20, 2005
Hi,I am seeing very slow connections from some client enterprise managersto server. Even at server level it takes 1 minute or less to open adatabase. I have adjusted some of the memory for the SQL server, butthere are only about 60 Dbs on the server, totalling about 2 GBs.CPU is very low at all times, 1 GB of ram, p3 1.4Ghz. SQL 2k.I know I should refrag the disk, but is there anything else I can doto speed up SQL operation via enterprise manager--ODBC connections is fairly fast, as well as query analyzer.Adam
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Mar 4, 2005
Does anyone know how to upload (bulk) data from a client (written in Excel VBA) to a remote SQL2000 database? Of coarse I tried "INSERT INTO" and rst.addnew but I noticed this is much, much slower as downloading from the same remote database.
Thanks.
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Sep 21, 2007
I have this 3rd party query:
SELECT D_P.PostId, D_P.TopicId, D_P.PostingUserId, D_P.BasePostId, D_P.ParentPostId, D_P.PostLevel, D_P.SortOrder, D_P.PostTitle,
D_P.PostDate, D_P.IsAnon, D_P.FileId, D_P.Property, D_P.IsDeleted, D_P.IsHTML, D_P.LastEdittedByUserId, D_P.LastEditDate,
CAST( ISNULL(D_P.FileId,0) AS BIT ) AS HasFile, F.FileName, CAST( ISNULL( U_RP.IsRead, 0 ) AS BIT) AS IsRead,
CAST( ISNULL( U_RP.IsFlagged, 0 ) AS BIT) AS IsFlagged, CASE WHEN IsAnon = 1 THEN CAST('Anonymous'AS VARCHAR(128))
ELSE U.FirstName+' '+U.LastName END AS Poster
FROM DISCUSSION_POSTS D_P
INNER JOIN USERS U ON D_P.PostingUserId = U.UserId
LEFT JOIN FILES F ON D_P.FileId=F.FileId
LEFT JOIN DISCUSSION_READPOSTS U_RP ON U_RP.UserId = 4265 AND D_P.TopicId = U_RP.TopicId
AND D_P.PostId = U_RP.PostId
WHERE D_P.TopicId = 460106
AND BasePostId IS NOT NULL
AND ((PostTitle LIKE '%flood%') OR (PostText LIKE '%flood%'))
AND ((PostTitle LIKE '%flood%') OR (PostText LIKE '%flood%')) -- No idea why they are doing this twice
ORDER BY PostDate DESC, D_P.PostId DESC
On the same server DatabaseA the query runs in less than 5 seconds. On DatabaseB the query times out. I can not see the execution plan for the query that times out. I am executing the query using SQL Server MGMT Studio. I have rebuilt all of the indexes, stats updated usage. Still no luck. I have checked all of the database setting and they are the same. If I comment out theste 2 lines "AND ((PostTitle LIKE '%flood%') OR (PostText LIKE '%flood%')) " the query run like it should and uses an execution plan all most the same as when using DatabaseA. Any pointers in the the right direction would be greatly apprecited!!!
Oh ya SQL Server EE 2005 sp 2 cu 3
Thanks,
~Joseph~
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May 10, 2007
We have a static class that makes an HTTPWebRequest to get XML data from one of our vendors. We use this as input to a stored proc in SQLServer2005. When I compile this class and call it from a console application in visual studio it executes in milliseconds, everytime. When I compile it, create the assembly and clr function and execute it in SQLServer, it takes around 14 seconds to execute the first time, then on subsequent requests it is again really fast, until I wait for 10 seconds and re-execute, once again it is slow the first time and then fast on subsequent requests. We do not see this behavior when executing outside SQLServer. Makes me think that some sort of authentication is perhaps taking place the first time the function is run in SQLServer? I have no idea how to debug this further. Anyone seen this before or have any ideas?
Here is the class:
Code Snippet
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
namespace Predict.Services
{
public static class Foo
{
public static string GetIntradayQuote(string symbol)
{
string returnQuote = "";
HttpWebRequest request = (HttpWebRequest)(WebRequest.Create("http://data.predict.com/predictws/detailed_quote.html?syms=" + symbol + "&fields=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,28,30"));
request.Timeout = 1000;
HttpWebResponse response = (HttpWebResponse)(request.GetResponse());
StreamReader streamReader = new StreamReader(response.GetResponseStream());
returnQuote = streamReader.ReadToEnd();
streamReader.Close();
response.Close();
return returnQuote;
}
}
}
When I run call it from a console app it is fine.
I compile it into a dll and then create the assembly and function as follows:
Code Snippet
drop function fnTestGetIntradayQuoteXML_SJS
go
drop assembly TestGetIntradayQuoteXML_SJS
go
create ASSEMBLY TestGetIntradayQuoteXML_SJS from 'c:DataBackupsCLRLibrariesTestGetIntradayQuote_SJS.dll' WITH PERMISSION_SET = EXTERNAL_ACCESS
go
CREATE FUNCTION fnTestGetIntradayQuoteXML_SJS(@SymbolList nvarchar(max)) RETURNS nvarchar(max) AS EXTERNAL NAME TestGetIntradayQuoteXML_SJS.[Predict.Services.Foo].GetIntraDayQuote
go
declare @testing nvarchar(max)
set @testing = dbo.fnTestGetIntradayQuoteXML_SJS('goog')
print @testing
When I execute the function as above, again, really slow the first time, then fast on subsequent calls. Could there be something wrong with the code, or some headers that need to be set differently to operate from the CLR in SQLServer?
Regards,
Skipper.
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Aug 10, 1998
At my location we are running Great Plains on SQL server with the Great Plains client on the front end communicating over IP Sockets. Occasionally the client will stop responding for up to 15 minutes. This occurs to all clients at the same time. While this is happening I have ran performance monitor on the SQL server using the SQL counters and everything looks fine. Performance on the server and the network does not degrade. Only the Great Plains client is affected. From this I feel this is not a network problem. I would like some suggestions on what could possible cause this type of problem. I am really just looking for a starting point on where the problem may be originating from. Any suggestions will be greatly appreciated.
thanks.
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Jan 28, 2002
I am experiencing VERY slow connectivity between client and server SQL 2000. I have checked the network activity and it is low. It also takes Enterprise manager ages to load, and then browsing tables and trees is impossible!
HELP!!
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Mar 25, 2004
Hello,
(Using win2k, sqlserver2k, framework 1.1)
I have an fairly data-heavy application that uses Windows authentication (Trusted connection/aspnet account) to connect to Sql Server. The site uses IIS basic authentication.
On the dev server everything works fine but when I move to the live server things get strange and it starts to crawl along. (Pages load OK but then it just crawls as it loads the datagrids etc. Sometimes it brings back incomplete/incorrect data )
BUT When I use Sql Authentication to connect to Sql Server and there is no problem at all!
Ok, there is something obviously wrong with the live server (which is identical setup to dev)but I dont know where to start.
Any ideas??
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Jan 26, 2007
Hallo
i'm experiencing an extremely slow connection from a WXPP Sp2 client to a MSSQL2000 running on a W2k server. The client is running a VB6 application that connect with Windows authentication: every form requesting data opens with a long delay at the first launch; next attempts run normally fast.
In the same LAN there are some others identical clients, all running fine.
Every other network activity from that client is ok.
Where should i start to investigate from?
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Mar 18, 2008
Hi
I have a database and when I run a query on it the query takes 10 minutes to complete. I am running the following query
SELECT t103.cs_flag, t103.pr_flag, SUM (t103.amount), COUNT (t103.record_id)
FROM br_data t103
WHERE t103.acct_id = 12 AND (t103.state = 3 OR t103.state = 7)
GROUP BY t103.cs_flag, t103.pr_flag
The br_data table doesnt seem to be using its indexes ?? And it has around a million records. Now when I export the database and import on to another SQL server and then run the same query as above it only takes 1 or 2 seconds.
On the server that we are having problems with I have tried to re-build the indexes using DBCC DBREINDEX (br_data,' ',0) but this hasnt helped. I have also tried backing up the database, delete the database then restore, this also hasnt helped. I have no idea why the query runs slow on the original box, but then quick when I transfer it to another server??
Both servers are running windows 2003 with SQL 2000 SP4. There are no resorrce problems such as CPU / memory, Any ideas??
Thanks
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May 11, 2004
Hello, everyone:
There is a big table with several million records. I am developing a query that retrieve the first rowset that meets WHERE condition. Any suggestions for the fast query? Thanks a lot.
ZYT
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Nov 8, 2006
Hello,
i have created an RPC from my SQL server which queries a database of a linked server (remote server).
the query result is very very slow. (it is a mis-size query, with many JOINs on tables with many entries). Let's say it takes about two minutes to get about 3000 results.
The query uses five tables in the database of the linked server, runs a few (let's about 5-8) JOIN clauses and selects the entries. except for two tables (out of 8), each table has about 1000-2000 entries. the two have about 40,000 entries.
Is this normal?!
Is there anyway i can optimize my query?
i also tested my query and asked for only 100 results as opposed to all of the 3000. there was only 2-3 second difference in getting the results back, which indicates that it is not the remote connection but the query itself which is slow.
any help would be greatly appreciated!!
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Oct 17, 2006
Hello,
I have 2 servers (say MAINSRV e SECSRV) running SQL2000 Standard SP3 on Windows 2000 Advanced within a NT (!) domain and each server is linked to the other.
My problem is that if I run a query returning few dozens of rows like:
SELECT * FROM MAINSRV.DbName.dbo.TblName TBLA
WHERE Fieldx = 'anyval'
from a client connected to the SECSRV server, it takes something like 35 minutes to complete, while the same query completes in no time when run on clients connected to MAINSRV.
Even the simplest SELECT Count(*) FROM... takes more than one minute from SECSRV while completing in a fraction of second from MAINSRV.
I tried to change the linked server security options (SQL/Windows), but the remote query remains slow.
There are no locks active on the table, both the servers have almost no load (CPU less than 10%, when tested) and the query returns just a few KBytes, so communication overhead will not be the problem.
Any suggestions will be very appreciated, thank you!!!
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Jul 20, 2005
Hi All,I have a table that currently contains approx. 8 million records.I'm running a SELECT query against this table that in somecircumstances is either very quick (ie results returned in QueryAnalyzer almost instantaneously), or very slow (ie 30 to 40 seconds toreturn results), and I'm trying to work out how I improve performance.Essentially the query I'm running is nothing more complex than:SELECT TOP 1 * FROM Table1 WHERE tier=n ORDER BY member_id[tier] is a smallint column with a non-clustered, non-unique index onit. [member_id] is a numeric column with a clustered, unique index onit.When I supply a [tier] value of 1, it returns results instantaneously.I have no idea if this is meaningful, but the tier = 1 records wereloaded first into the table, and comprise approximately 5 millionrecords.When I supply a [tier] value of 2, the results take 30 to 40 seconds.tier =2 records were loaded second, and comprise approximately 3million records.I've tried running an execution plan, and while I'm no expert, itappears to me that the index on tier isn't being used, even if I use:tier = CAST(2 as SMALLINT)I'm wondering if anyone can give me ANY advice on how to get anybetter performance out of this SELECT statement?Also, out of curiosity, can a disk defragment have a positive impacton SELECT query performance?Any help very much appreciated!Much warmth,Murray
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Jun 14, 2006
Hello can some one explain this to me and give me some advice. I have sqlserver1 and sqlserver2 I have a linked server set up [ipaddress] on both servers. When I pass a variable to the stored proc or the query it takes up to 20 seconds to return 1 row but if I replace my varibles like email='sqlboy@coxnet' and firstname='ted' and lastname='clien' it returns the one row im looking for in about 2 seconds but if I pass email =@email ,fname=@fname,lname=@lname I get the 20 second thing. The query is a stored proc being called from an asp app. I get the same results when I run this in query analyzer.
Here is the query.
DECLARE @email VARCHAR(75),@fname VARCHAR(50),@lname VARCHAR(100)
IF EXISTS (SELECT TOP 1 email
FROM [ipaddress].{database}.dbo.{tablename}--server1
WHERE email = @email )
BEGIN
set nocount on
SELECT TOP 1 email,
FIRSTNAME,
MIDDLENAME,
LASTNAME,
TITLE,
COMPANYNAME,
ADDRESS1,
ADDRESS2,
CITY,
STATE,
ZIP,
COUNTRY
FROM [ipaddress].{database}.dbo.{tablename} --server2
WHERE email in(SELECT EMAIL
FROM [ipaddress].{database}.dbo.{tablename} where email=@email--server1)
AND RecordStatusID ='1' and FirstName=@fname and LastName=@lname
END
ELSE
IF EXISTS (SELECT top 1 email,
FIRSTNAME,
MIDDLEINITIAL,
LASTNAME,
TITLE,
COMPANYNAME,
ADDRESS1,
ADDRESS2,
CITY,
STATE,
ZIP,
COUNTRY
FROM {databases}.dbo.attendees--server1
WHERE email =@email and FirstName=@fname and LastName=@lname)
BEGIN
SELECT TOP 1 email,
firstname,
MIDDLEINITIAL AS MIDDLENAME,
lastname,
title,
companyname,
address1,
address2,
city,
state,
zip,
country
FROM {database}.dbo.attendees --server1
WHERE email in (SELECT DISTINCT email
FROM server1.dbo.ebooksrequests--server1
where email=@email) and email=@email and FirstName=@fname and LastName=@lname
SET NOCOUNT OFF
END
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Jan 8, 2008
Ok, I'll admit right off the bat that I never suspected that I'd ever raise this complaint, much less worry about how to fix the "problem" associated with it!
We're preparing to take a large set of changes (projects) to PeopleSoft Financials from development to test. The code is still somewhat rough, but it has been "desk checked" to ensure that it does what the developers think that it ought to do, and they've blessed it at that point. The code is now moving into the test phase, and the QA team is finding locking/blocking issues that we've never seen in this code before... Sort of a "lock avalanche" where no one process locks for very long, but many of them block one another to the point where applications actually "freeze" while almost never hitting a deadlock.
My solution was to create a "blitzkrieg" query / stored procedure that would periodically sample master.dbo.sysprocesses, master.dbo.sysdatabases, and apply one of the dm_ functions to gather information on locking, blocking, and deadlocking. My procedure runs nicely (it never hangs) and gets about 99.3% of the data that I want.
The problem is that the blasted query / stored procedure runs either too fast or too slow, depending on how you look at it. Because the dm_ function takes a few ms to run, there can be a situation where either a row appears as a false positive or as a missing row because of timing... Either the culprit shows up as a blocker, but by the time the victim spid is evaluated the block has cleared, or the row is skipped and by the time the victim is evaluated the block has occured.
The whole process runs in well under 100 ms when there is nothing to report, and I've never seen it run 200 ms yet under the worst conditions it has faced, so the code is fast... The problem is that I really don't want to try to enforce any kind of locking to resolve the issue, because that locking would impact performance and that is EXACTLY what I do NOT want to do.
Any suggestions?
-PatP
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Oct 17, 2007
Hello,
I was in a confusion that is Stored Procedures are really fast ? I have a .NET application where I am using Stored Procedures. But recently I cam through this link http://weblogs.asp.net/fbouma/archive/2003/11/18/38178.aspx which describes Stored Procedures are bad and it won't give any performance difference. What is the truth ? Will it give good performance that passing query from the application ?
Please make it clear
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May 2, 2006
On Windows XP systems I get the following issue when trying to browse the MSDB folder in SSIS
Client unable to establish connection
Encryption not supported on SQL Server. (Microsoft SQL Native Client)
I have noticed another post where several others have noticed the same issue. It appears to only occur on Windows XP installations. Is there a workaround or fix for this?
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Jan 5, 2006
On my development machine (XP Pro), when I run several reports in a loop, my connection count (in performance monitor) climb up to around 25 then immediately drop back to 1 when the reports are done being generated.
On our production server (WinServer 2003, IIS6) the SQL connection count climbs up to around the same number, then holds there for a few minutes. I know I am closing the connections properly in my code because they clean up fine on the development machine.
I'm sure this is a timeout setting or an IIS 6 option I need to tweak. How can I make my production machine remove those connections faster?
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Jun 21, 2007
I've been using full-text for quite some time, but I switched to another product for quite some time. The reason is that microsoft full-text doesn't offer the feature where one can get a resultset of page x out of y pages, i.e: give me top 100 matches of page 125 out of 5000 pages. I disappointedly waited for SQL Server 2005 and now it doesn't seem to support in sql server 2008 full-text search either. I had to get all 5000 pages of data, then jumped to page 125 to get just 100 records of that page--had to go get a coffee and came back for a 2+ millions rows table. Customers want the result in a split of a second.
Anyone knows if the final version of sql server 2008 will have better support for paging and getting top x rows? I scanned through 2008 BOL and didn't see any change from sql server 2005 or even sql server 2000 full-text search. (one improvement in sql server 2005 over sql server 2000 was the speed of populating large catalog and multiple languages support)
Thanks,
HH
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Mar 1, 2007
Storing large graph in
relational form doesn't allow us to perform graph operations such as
shortest path quite efficiently. I'm wondering if storing the graph as
objects would be better? How should I design the schema? Thanks!
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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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