Performance - PAGEIOLATCH_SH
Mar 30, 2007
Hi,
I need to delete data which is older than a year from a table which contains 54 million rows (yes i know, ridiculous isn't it).
I am using the below query:
DELETE tblLineCard
WHERE CreateDT <= dateadd(yy,-1,getdate())
It worked fine for the smaller tables, but shortly after starting up the above query it starts blocking itself (ie. it shows: SPID 55(Blocked by 55), under current activity in EM), goes into sleeping status and and has a wait type of PAGEIOLATCH_SH.
There are NO other queries taking place.
The transaction log keeps on growing and Query analyzer shows the "Executing Query Batch" message.
Any ideas? I have killed the process and restarted but same scenario each time. Your help would be wonderful.
Yours sincerely
SQLJunior...
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Dec 7, 2007
Hi,I wondered in anyone can help with the following problem that i'mexperiencing, i'll try to provide as much info as possible and anysuggestions would be appreciated.I have just started at an organsiation and there seems to be slowperformance maybe on the san on a 64bit itanium dual core machine. 4CPUs are being showed to sql server, it also has 16gb of RAM. I'llstart with the configuration of the SAN.After speaking to the SAN guy, rather than carve the SAN up intodifferent area's for san Logs/Data etc they have gone for the approachof spreading a Vdisk across as many spindles as possible (All 145 ofthem). So the area that is presented to the SQL Server according thethe SAN guys is a vraid 5 stripe made up of all 145 disks which areall 72gb fibre-channel disks.This storage is not just made available to sql server but also madeavailable to other apps as well that need storage. Having read themanufactres best practice on setting this up there is a valid argumentfor doing this.The bandwidth from the SAN is 2Gb fibre, with each computer that usesthe SAN having 2Gb fibre cards.Clearly, that could act as a bottle-neck. But, there's nothing thatcan be done about it according to the SAN guy.Needless to say, any changes on the SAN are pretty much going to beout of the question as far as he's concerned but i think performanceisn't that good for the type of box they have and the SAN its attachedto.The 2nd thing i'll explain is the setup of the database in question,firstly whoever set it up split the database into 16 different file of4 filegroups so the table that i'm selecting to is in one filegroupsplit over 4 files and the the table selecting from is in anotherfilegroup made up of another 4 files. These are placed on the samephysical disk made up of the SAN LUN with 145 spindles.Anyway when i do a select from a sales table which has various groupbys and then insert the results into a blank table with no indexes itcan take over 2hours for 200k rows which i find very slow.When i look at the sysprocesses table i am getting various waits asfollows :-72427200x0042900PAGEIOLATCH_SH 6:9:219209472427200x00690SLEEP_TASK72427200x00000SOS_SCHEDULER_YIELDThe process seams to be going inbetween a PAGEIOLATCH andSOS_SCHEDULER_YIELD a few times per second.Running the following to get io stalls gives the following :-Select * from sys.dm_io_virtual_file_stats (6,7)Select * from sys.dm_io_virtual_file_stats (6,8)Select * from sys.dm_io_virtual_file_stats (6,9)Select * from sys.dm_io_virtual_file_stats (6,10)gives results like :-67170853985015624218246512844829457222526431245540454412438340307010565449074954240x0000000000000954It worries me that when the process is on the PAGEIOLATCH the waitcan be over 1000. Is it normal for the wait to be this long and whatwould be the best way to prove one way or another if the configurationof the san is causing this kind of performance???Thanks for any suggestions in advanceIan.
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Aug 1, 2000
I am running into problems while running a large procedure, and i think it may have something to do with a PAGEIOLATCH_SH wait problem.
My server, whose sole purpose is to run this one procedure, is doing plenty of disk i/o, and the CPU’s bouncing around, so I assume it’s working. But when I look at its process info, it seems to be sleeping a lot of the time on PAGEIOLATCH_SH. No other users are in the DB, so I'm quite confused. I don't find much info on this anywhere, so any insight would be very appreciated.
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Sep 12, 2004
1. Use mssql server agent service to take the schedule
2. Use a .NET windows service with timers to call SqlClientConnection
above, which way would be faster and get a better performance?
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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 ***
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Jun 22, 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 witha particular query. It would take approximately 22 seconds to return100 rows, thats about 0.22 seconds per row. Note: I ran the query insingle user mode. So I tested the query on the Development server bytaking a backup (.dmp) of the database and moving it onto the devserver. I ran the same query and found that it ran in less than asecond.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 isrelated to some external hardware issue like: disk space, memory etc.Or could it be OS software related issues, like service packs, SQLServer configuations 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 systemrelated issue.Any Ideas would help me greatly!Thanks,Brian T
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Mar 9, 2007
We have the same application installed on a few different environments with similar servers and similar hardward. The only difference is the versions of SQL and the colations.
Is SQL 2005 a lot faster that SQL 2000? Could colation type make a big effect on performance?
ScAndal
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Aug 31, 2007
HiI want to insert 1000s of records into SQL Server 2005 Database with some manipulation. So that i put into the For Loop and inserting record.Inside the loop i am opening the connection and closing after use. The sample code is belowfor(int i=0;i<1000;i++){ sqlCmd.CommandText = "ProcName"; sqlCmd.Connection = sqlCon; sqlCmd.Connection.Open(): sqlCmd.ExecuteNonQuery(); sqlCmd.Connection.Close(); } What my Question is.. How is the Performance of this Code..?? Will is take time to get the Connection and Close the Connection in every itration?Or Shall I Open the Connection in Begining of the outside loop and close the connection at end of the Loop? will it increase the Performace?Please clarify me these question.. Thanks in advance.
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Dec 8, 2003
I have a following problem with SQL performance:
this line 'select * from [viewUserLatestFee]' executes instantly (in Query Analiser)
this line 'select * from [viewUserLatestFee] where orgID = 1' takes up to 30 seconds for 1000 rows (still in Query analiser)
can anyone please help - I seem to have ran out of ideas
I have a feeling people might be curious about the view so here it is:
SELECT dbo.viewUserPosition.id, dbo.viewUserPosition.username, dbo.viewUserPosition.password, dbo.viewUserPosition.title,
dbo.viewUserPosition.firstName, dbo.viewUserPosition.lastName, dbo.viewUserPosition.email, dbo.viewUserPosition.address1,
dbo.viewUserPosition.address2, dbo.viewUserPosition.suburb, dbo.viewUserPosition.postcode, dbo.viewUserPosition.country,
dbo.viewUserPosition.state, dbo.viewUserPosition.mailAddress1, dbo.viewUserPosition.mailAddress2, dbo.viewUserPosition.mailSuburb,
dbo.viewUserPosition.mailPostcode, dbo.viewUserPosition.mailCountry, dbo.viewUserPosition.mailState, dbo.viewUserPosition.birthDate,
dbo.viewUserPosition.joinDate, dbo.viewUserPosition.lastUpdated, dbo.viewUserPosition.orgID, dbo.viewUserPosition.positionID,
dbo.viewLatestPaidFee.feeID, dbo.viewLatestPaidFee.mshipID, dbo.viewLatestPaidFee.name, dbo.viewLatestPaidFee.[desc],
dbo.viewLatestPaidFee.terms, dbo.viewLatestPaidFee.period, dbo.viewLatestPaidFee.periodType, dbo.viewLatestPaidFee.fee,
dbo.viewLatestPaidFee.startDate, dbo.viewLatestPaidFee.endDate, dbo.viewLatestPaidFee.deleted, dbo.viewLatestPaidFee.feePaidID,
dbo.viewLatestPaidFee.paidDate, dbo.viewLatestPaidFee.effectiveDate, dbo.viewLatestPaidFee.approved, dbo.viewLatestPaidFee.optionID,
dbo.viewLatestPaidFee.paidAmount, dbo.viewLatestPaidFee.feePaidEndDate
FROM dbo.viewUserPosition LEFT OUTER JOIN
dbo.viewLatestPaidFee ON dbo.viewUserPosition.id = dbo.viewLatestPaidFee.userID
Here is viewUserPosition:
SELECT dbo.tblUser.id, dbo.tblUser.username, dbo.tblUser.password, dbo.tblUser.title, dbo.tblUser.firstName, dbo.tblUser.lastName, dbo.tblUser.email,
dbo.tblUser.address1, dbo.tblUser.address2, dbo.tblUser.suburb, dbo.tblUser.postcode, dbo.tblUser.country, dbo.tblUser.state,
dbo.tblUser.mailAddress1, dbo.tblUser.mailAddress2, dbo.tblUser.mailSuburb, dbo.tblUser.mailPostcode, dbo.tblUser.mailCountry,
dbo.tblUser.mailState, dbo.tblUser.birthDate, dbo.tblUser.joinDate, dbo.tblUser.lastUpdated, dbo.tblRelPosition.orgID,
dbo.tblRelPosition.positionID
FROM dbo.tblUser INNER JOIN
dbo.tblRelPosition ON dbo.tblUser.id = dbo.tblRelPosition.userID
and viewLatestPaidFee:
SELECT dbo.tblMshipFee.id AS feeID, dbo.tblMshipFee.mshipID, dbo.tblMshipFee.name, dbo.tblMshipFee.[desc], dbo.tblMshipFee.terms,
dbo.tblMshipFee.period, dbo.tblMshipFee.periodType, dbo.tblMshipFee.fee, dbo.tblMshipFee.startDate, dbo.tblMshipFee.endDate,
dbo.tblMshipFee.deleted, fp.id AS feePaidID, fp.paidDate, fp.effectiveDate, fp.approved, fp.optionID, fp.paidAmount, fp.endDate AS feePaidEndDate,
fp.userID
FROM dbo.tblRelMshipFeePaid fp INNER JOIN
dbo.tblMshipFee ON dbo.tblMshipFee.id = fp.feeID AND fp.endDate =
(SELECT MAX(fp2.[endDate])
FROM [dbo].[tblRelMshipFeePaid] fp2
WHERE fp2.[userID] = fp.[userID])
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Jan 13, 2005
We used a stored proc to pull totals from a database. Everything was fine until the table grew and started to time out. So we created a temp table to populate with a range of data and then pull the totals from there. Everything was fine until the table grew and started to time out. Any suggestion?
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Jan 17, 2002
Hi,
I am newly joined as SQL DBA. I want to check the Physical disk Performance. we have RAID 5 with 5+1 disks. I calculated NO Of IO's Per Disk. But how do we know what is actual limit of IO's per disk.
Thanks
Praveen
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May 8, 2001
What's my best bet in getting better performance out of one of my database servers? Currently we have 1 set of Raid5 disks partitioned into 2 drives. This houses everything (system, database, and logs) If that server has 2 slots left for drives I was thinking of putting 2 mirrored drives and getting the logs off the main database space? (Make sense?) This is a vendored application so working with new indexes etc. isn't something I should do wo/ the vendor's interaction. Will what I describe above help?
Thanks
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Mar 31, 2001
hi,
i am using to move data from oracle to oracle.
i have used stored procedure in oracle for the update/insert .
the dts calls the stored procedure for each record, due to this the performance has gone down. how do i increase the speed of data xfer.
has any one done any thing similar ?
Tushar
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Jun 26, 2001
We have SQL Server running on a dual processor Pentium 500mhz server. Our database is hit by about 300 users. 200 of those users are doing constant searches though a client table of about 250,000 records, which in turn is linked to a history table containing over 5,000,000 records. This is only the tip of the iceberg, we have many triggers, procedures, updates, etc. going in the background. The database has over 500 tables.
Keep in mind, these searches that are taking place can involve all kinds of fields: phone number, company name, fax number, first name, last name, status, wildcard searches, etc. So as you can imagine, the database is being hit with all kinds of funky requests to find records. I will be the first to admit that our developers (vendor) are not the best code writers, and we have a tough time getting them to optimize something they do not even understand themselves.
As I speak, our processor utilization is maxing out between 95 to 100 percent. I've done a lot of performance tuning and all of the problems lie in the searching. We've built, tested, rebuilt, re-tested each and every index. I even used the Profiler to filter what I could. It has improved, but our database is growing at a rate of 10 megs a day (already close to 3 gigs, not that huge). I think I've optimized my indexes as best as I can considering all the fields and possibilities available to users to search for records.
For a database that requires all of these different search criteria, what would be a more optimal server? We are looking to purchase something ASAP. I could really use help from someone in a similar situation. It seems odd, in mind, that a company of 300 people would need to rely on a quad server (four processor capability.).
Thanks. JT
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May 31, 2000
HI
I have 700 to 900 mb of production database , 2 gb of ram , 30 gb hard disk,
My production machine is runnng very slow , i have check everything memory,
page/sec, catch hit ratin , dbcc dbreindex but still it performance is not up to the mark.
If i stop SQL SERVER & restart for few days machine works fine but after that
again same thing it work very slow, what could be the reason
if any one had any solution please suggest.
Thanks
Nil
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Jan 17, 2000
Hi friends,
My company has aution web site, it is written in Java and all sql statements generated dynamically. No stored procedures used. If 30 users uses this site it is OK but if around 300 users uses then the site becomes very slow(almost dead) and developers saying that database is the bottle neck. Please help me in this problem how can I check and overcome this problem.
Thanks
dindu
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Apr 27, 2000
I am running a SQL 7.0 server on a two processor machine. We are having some performance issues.
one of the processor is always above 90% utilization but the second is barely at 50%.
Will adding another processor help or are the processes locked to one processor.
The server is a dedicated sql server. nothing else is running on it.
Thanks for any info you can provide.
Pierre
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Oct 20, 1999
Hi,
What I have to do to determine which is the capacity (transactions / sec) of MS SQL Server 7.0 on a specific hardware configuration?
Thank you,
Sebastian Bologescu
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May 5, 2001
We have recently upgraded to SQL 7.0 on NT 4.0/sp6 box which has got 4 PIII 700 processors, 1GB RAM, and 70GB HDD on RAID 1 and RAID 5. We feel that the application performance is not great as expected in SS7. (The application was running in 6.5 smoothly and performance was good)
Is there any option needs to set to improve performance? Now, SS 7 using all the 4 processors and dynamically allocated memory, etc. Any thoughts greatly appreciated.
Thanks in Advance
Jaya
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Mar 14, 2002
I'm running MS SQL Server on a 1.4 GHz AMD Athlon Processor with 750 MB or RAM and ample disk space. I have a table with 14 columns; 2 datetime, 8 int and the rest are varchar of various sizes less than 13.
I run a java process on another machine that connects to the database and insert records. It takes about 6 minutes to insert 100,000 records.
I run the xp performance monitor and only about 25% of the SQL Server machine's cpu is being used. I run top on the Linux box running java and I see about the same results. Neither machine is kept busy processing. Why don't I get better performance? Could my local area network be that slow? How many inserts per minutes is good performance?
Thanks for your input.
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Jan 23, 2001
Does anyone know the performance differences between returning data from SQL Server as XML vs. as a record set? We are about to dive into the For XML world full force, but we wanted to make sure that we are not heading for a performance nightmare.
Thanks for any insight on this. I'll try to look for white papers and do some testing in the meantime.
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Feb 5, 2004
I ave the following Code in my Stored procedure.
Declare Cursor for table A
WHILE @@FETCH_STATUS = 0
Get values from other function based on some business logic.
INSERT Into another table B
(or)
UPDATE to another table B
END
I have to insert/update values to table B, one by one row. So, it is taking more time.
Is there any way to collect the values into a temporary storage and Insert/update or Move the values to table B.
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Apr 4, 2008
1. where do we see the buffer cache hit ratio. can we set the buffer catche hit ratio manually.
2.In query execution plan we execute the query for performance issue.which parameters we check to take an action?
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Apr 14, 2008
I have a small doubt. If we keep our data files and log files on sepertate disks how this can improve the database performance.
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Apr 5, 2006
Hello,
I build a query in SQL-server 2000 but i'm not happy with the performance, it takes about 15 minutes to execute the query (4 min INSERT and 11 min UPDATE). The table tbl_total has 3 million records and an index on Contract and Item, the table contracts has 1 million records and a key on Contract and Item.
How can I speed up this query, is it for example possible to put an index on @table (internal table)?
Thanx in advance!
DECLARE @table TABLE (Contract nvarchar(15), Item nvarchar(12), Change_date datetime)
INSERT INTO @table
SELECT TOT.Contract, TOT.Item, MAX(TOT.Change_date)
FROM tbl_total TOT
WHERE EXISTS (SELECT 'X' FROM contracts CONT
WHERE TOT.Contract = CONT.Contract
AND TOT.Item = CONT.Item)
GROUP BY TOT.Contract, TOT.Item
UPDATE contracts
SET contracts.Change_date = TT.Change_date
FROM contracts INNER JOIN @table TT On
contracts.Contract = TT.Contract AND
contracts.Item = TT.Item
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Dec 4, 2006
Hi
I wanted to find out which is faster in terms of performance:
e.g.
select * from orders where orderRef = '00093'
Or
select * from orders where orderRef like '00093'
I know there is a differnece if i use the wild cards % etc in the results but i wanted to find out with regards to the queries above?
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Jan 20, 2007
For performance should we index on primary key & data in table in the same file group or different file group (same or different drive) ?
Thanks,
Andy
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Aug 23, 2007
i need help in gaining the performance of this query
SELECT
tblSuperClientFile.ClientRefNo,
tblReferral.RefID,
tblRail.RailDescr,
tblReferral.SuperClientVendorID,
tblVendor.VendorName AS Client,
tblReferral.AssignedVendorID,
tblReferral.ReferralDate,
tblSpikeDate.DateCompleted AS PlanRevCompleted,
tblReferral.CloseDate,
tblCloseReason.CloseReason,
tblBankruptcyInfo.BK_Filing_State,
tblBankruptcyInfo.BK_Case_Number
INTO #PlanRev
FROM FNFBSDataMart.dbo.tblSpikeDate tblSpikeDate WITH (NOLOCK)
INNER JOIN #ActiveBK
ON tblSpikeDate.MasterID = #ActiveBK.MasterID
AND tblSpikeDate.FID = 3160
AND tblSpikeDate.DateCompleted <= GetDate()-5
INNER JOIN FNFBSDataMart.dbo.tblReferral tblReferral WITH (NOLOCK)
ON tblReferral.RefID = tblSpikeDate.RefID
AND tblReferral.ReferralDate >= GetDate()-180
AND tblReferral.AssignedVendorID NOT IN (188,1721)
INNER JOIN FNFBSDataMart.dbo.tblBankruptcyInfo tblBankruptcyInfo WITH (NOLOCK)
ON tblReferral.RefID = tblBankruptcyInfo.RefID
AND #ActiveBK.bk_Case_Number = tblBankruptcyInfo.bk_Case_Number
INNER JOIN FNFBSDataMart.dbo.tblSuperClientFile tblSuperClientFile WITH (NOLOCK)
ON tblReferral.ClientFileID = tblSuperClientFile.ClientFileID
AND tblSuperClientFile.SuperClientVendorID IN (1816,125,127,1706,766,1820,137,141,144,145,1593,1808,146,990,1745,149,1215,1854,1867)
INNER JOIN FNFBSDataMart.dbo.tblRail tblRail WITH (NOLOCK)
ON tblReferral.RailID = tblRail.RailID
INNER JOIN FNFBSDataMart.dbo.tblVendor tblVendor WITH (NOLOCK)
ON tblReferral.SuperClientVendorID = tblVendor.VendorID
INNER JOIN FNFBSDataMart.dbo.tlkpState tlkpState WITH (NOLOCK)
ON tblSuperClientFile.StateID = tlkpState.StateID
AND (tblSuperClientFile.SuperClientVendorID <> 1820
OR tlkpState.Abbrev NOT IN ('AZ','AK','CA','HI','ID','NV','OR','TX','UT','WA'))
LEFT OUTER JOIN FNFBSDataMart.dbo.tblCloseReason tblCloseReason WITH (NOLOCK)
ON tblReferral.CloseReaID = tblCloseReason.CloseReaID
can anyone have a look at it and give me a feed back asap
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Jul 23, 2005
This:SELECT MAX(TheDate) FROM MyTableor this:SELECT TOP 1 TheDate FROM MyTable ORDER BY TheDate DESCAs a follow up question to save me having to post, if I want a differentfield from the result set of a MAX query, how do I do it? ie. I want the"Condition" field of the record with the most recent date. I have beendoing it like this:SELECT TOP 1 Condition FROM MyTable ORDER BY TheDate DESCbut if MAX(TheDate) is quicker, I would like to SELECT TOP 1 Condition ....where TheDate is the max date...... Hope this makes sense.....Basically, I'm going to be performing this query nested inside another queryand I want the maximum performance possible (indexes are a differentquestion), which means trying to avoid table scans....
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Feb 15, 2007
Hi...I have a server that responds to web pagesand back end processing....im not sure the best place to start to increaseperformance.....im a programmer..not a super dba but im pretty good...i have two servers at the isp site....wasthinking of putting all the backen store procedures on one server and whenthere invoked to retrieve the record sets from server1 ....looking for some ideas...on how to make this server performanceincrease.....thanksMark
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Jul 20, 2005
Hi,Can anyone advise me of a quick way to estimate the time taken by DTS toimport a table (24 columns x 700,000 rows) from JD Edwards (running onAS400) into SQL Server (new table and no manipulation involved)?Many thanks,Steve
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Nov 1, 2007
I have a stored proc which is the basis for a report and it takes approx 2 minutes to run from mgt studio. When the proc runs from the report however, it takes approx 6 minutes. This behavior is consistent and happens in a similar fashion with many of the procs behind the reports. It does not appear to be sql server load dependent, it does this when there is no other sql server load. any ideas?
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May 23, 2007
Hi everyone,
I've got the following problem.
I'm trying to pull data to the device by means of RDA and I faced the following issue. When trying to run the same query twice I get completely different results.
The first one takes much more time to run. It takes about a minute while the second time the same query takes about a second!!! Furthermore, MS SQL Profiler says that the first query comes to MS SQL only about 30-40 seconds after it was posted by the device. (emulator, device connected via ActiveSync or WiFi - it doesn't matter).
Could you advise what's the problem and what's the point I missed?
Thanks in forward
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