Is There Performance Loss If I Delete Frequently
Apr 17, 2008
I use SQL2005 EE to capture the "In Progress Data" from the Devices and have connected it to the Main server-SQL2005 SE thro linked Server. I Run a Job that updates the Main server and Clears the "in Process Data".
Off late I have been seeing that the systems with SQL2005 EE have gone slow ? I have not investigated the reason. But wanted to find out if using this method ,should I need to take additional precautions ?
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Oct 26, 2007
was trying to performance tune a query and came up on this weird issue(Weird to me atleast.. possibly because I am a newbie:-))).
When I run the query mentioned below, I get the results in 1 second, while the same query, if I declare a variable for the value I am comparing, it takes 40 seconds. I am on SQL Server 2000. Both queries are being run in the same DB on the same tables and the only difference between the two is that the date has been declared as a variable. I am able to consistantly reproduce this. Tried casting the variable, declaring it as varchar , replacing the date by getdate() at both places, but the moment I use the variable, the performance goes for a toss. Has anyone came across any similar issues?
TIA
Callista
Query 1
select ae.Col1, ae.Col2, ae.Col3, ae.Col4, ge.Col4, c.Col5, 0
from table1 ae WITH (INDEX=ind_Col3 NOLOCK), table2 ge with (nolock), table3 c with (nolock)
where ae.Col1 = ge.Col1
AND ae.Col4 = c.Col1
AND ae.Col3 > '2007-10-25 14:18:12.380'
and ae.Col6 is not null
Query 2
declare @MyVariable datetimeselect @MyVariable = '2007-10-25 14:18:12.380'
select ae.Col1, ae.Col2, ae.Col3, ae.Col4, ge.Col4, c.Col5, 0
from table1 ae WITH (INDEX=ind_Col3 NOLOCK), table2 ge with (nolock), table3 c with (nolock)
where ae.Col1 = ge.Col1
AND ae.Col4 = c.Col1
AND ae.Col3 > @MyVariable
and ae.Col6 is not null
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Jan 6, 2006
I am doing a mass update of our SQL script files by adding dbo.to all references to the tables.The code is also adding dbo. in front of existing lines of codethat are like this:SELECT CLIENT.FIRSTNAME,CLIENT.LASTNAMEFROM CLIENT....The mass update is causing this to become:SELECT dbo.CLIENT.FIRSTNAME,dbo.CLIENT.LASTNAMEFROM dbo.CLIENT....My goal is to see FROM dbo.CLIENTbut even the column names are getting the "dbo."added, so my question is if there's any performanceloss or any other side effect if I end up all my columnswith a preceeding "dbo."?Thank you
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Jan 15, 2008
I've about 2-10 millions records to delete. Is there anyway to have this delete statement run faster?
while exists (select * from table_report WHERE report_date between @from_date and @to_date)
begin
DELETE TOP (10000) FROM table_report WHERE report_date between @from_date and @to_date
end
Thanks,
-Ash
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Jul 23, 2005
Hi!I'm experiencing the following experience problem with my SQL Server 2000.Explanation a' la example;1.I insert data using my SP; EXEC dbo.up_DataInsertThis is fine, SQL Profiler duration only a few ms.2.I try to select the data.select * from dbo.tblData where DataNumber = 283279This is fine, SQL Profiler duration only a few ms.3.delete from dbo.tblData where DataNumber = 283279This is NOT fine, SQL Profiler duration up to 50 seconds!!!I have got a unique index with ignore duplicate key and the table has about180.000 records.What could be wrong here??/Magnus
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Jan 15, 2008
I want to use "on delete cascade" in one of my tables but I'm worried though whether this can affect the performance when having millions of records. To explain more I'm working on a social networking website and I have two tables UserAccounts, in which I only keep the username and password and a few related fields, and Profiles in which I keep the profile data for users, I want to be sure that I won't have any records in the Profiles table without corresponding records in the UserAccounts table. Please see the DDL below to understand more the structure of the tables:
CREATE TABLE UserAccounts
(
UserID INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
UserName VARCHAR(20) NOT NULL,
Password VARCHAR(20) NOT NULL,
--other fields (e.g. last login .. etc)
)
CREATE TABLE Profiles
(
UserID INT NOT NULL REFERENCES UserAccount(UserID),
-- other fields (e.g. birthdate, nationality .. etc)
)
Any suggestions are highly appreciated...
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Oct 10, 2000
I have a query that retrieves a single record from searching on two tables.
The statement goes like this...
select sum(amount) from Table1 A union Table2 B on a.id = b.id
where date < ### and date > #### and account = ###
As people are running a particular report, this statement is executed time and
time again to pull up the numbers necesarry for the report. When the report gets slow, I can speed it up by updating the statistics. My concern is that I'm having to update the statistcs every hour; otherwise, the query becomes slow. I have noticed that users are inserting data while users are running the report on one of the tables listed above. I'm sure that's making it become more fragmented and ultimately slowing down the query.
Do you have any suggestion on how I can make the union of these two tables faster? Or is there anything I could do to speed the query besides creating clusted indexes?
Any help would be appreciated....thank you
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Jul 2, 2001
Hi Everybody:
We have a table which needs to be updated 2 million times per day. It hosts all real time transaction. There are 200K records in this table. Would you please to share your experience with me about how to protect/save such table in SQL 2000 from any possible damage?
We plan to use point-in-time backup (every 5 minutes). It still takes at half an hour to recover the whole database. Any new technology from Microsoft or SQL 2000 you can recommend?
Thank you very much.
Joan
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Sep 25, 2001
Can any one recommend an approach for identifying the frequently accessed tables and files in a SQL/Server application? Particularly, if the database is stored on raw partitions instead of FAT or NTFS. Thanks.
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Mar 28, 2004
Hi,
I have Oracle 9i. Oracle listener is aborting by itself after every few minutes giving TNSLSNR.exe failed. While listener is running I can do all the activity on the database.
Please let me know if there is any solution.
Thanks in Advance.
Pushpam
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Sep 14, 2005
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Jan 24, 2008
Hey guys. I need a little help once again, here's the problem:
We are using an attendance system software that adds records in an Access 97 table whenever someone logs in or out of the room (Yes, it's old and I hate it, but it came with the hardware).
So we plan to create a program that lets admins check those login/logout data in an SQL Server 2005 database using a Visual Basic as the frontend.
Our only problem is, how do we transfer data from the Access 97 tables to our SQL tables *everytime* it gets updated? We don't need every detail the Access97 table has (it has IDNo, CardNo, Time, Location, plus other useless stuff). We just need to extract the IDNo(int) and Location(varchar) field(we'll just use getdate() for the Time since the update is done in realtime anyway).
So in a way, we are trying to find out a way to technically sync both tables, just like Database Mirroring style.
Any suggestions?
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May 7, 2007
Hi,
In a project with SQL Servcer 2005 the customer is interested to save (archive) content of a table frequently. They want to have possibility to restore the table content as before. I have suggested to export the table every day to a text file and save the file in Visual source safe. If they need there will be possibility to import the text file later. Now I wonder, is there any other way to do archiving of the table content in SQL Server 2005?
Best regards
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Sep 1, 2015
We are receiving following alerts frequently about 1:40 AM in the morning. We have backups running on 11:00 PM everyday and rebuild job running at 2:00 AM. Not sure the exact cause of this error.
Error:
The file group "PRIMARY"Â for the database "tempdb" in SQL instance "MSSQLSERVER" on computer "XYZ" is running out of space.Â
tempdev Initial size : 133,100 MB Growth: By 10 percent, Limited to 140000 MBÂ
templog  Initial Size : 5,475 MB   Growth: By 10 percent, Unlimited
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Aug 27, 2015
How to solve the below blocking issue
One of our production server is configured with Always on with sql cluster.
We are getting frequently blocking
Waiting Resource Key Type: Key
WaitType: LCK_M_S
WaitResourceDatabaseName : ReportServerTempDB
WaitingSessionProgramName: Report Server
BlockingSessionProgramName: Report Server
WaitCommandType: Select
WaitingCommandText: Create Procedure dbo.checksessionLoak @sessionID...
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Oct 10, 2006
Hi guys,
I faced problem related to Locking and Isolation Level on Table(s).
My problems is there r some tables which r frequently updated, and I also want to fire select query over those tables every 1 seconds and want to get only committed records.
In current scenario we start transactions with ReadCommitted Lock for updating records. But in this scenario I can€™t get select query result because of some of recourses r used by transactions so after some time it gives Deadlock error.
So I want solution like both operation run simultaneously and get only committed records at a time of transaction running
Please help me for solving my problem.
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Sep 1, 2015
We are receiving following alerts frequently about 1:40 AM in the morning. We have backups running on 11:00 PM everyday and rebuild job running at 2:00 AM. Not sure the exact cause of this error.
Error:
The file group "PRIMARY" for the database "tempdb" in SQL instance "MSSQLSERVER" on computer "XYZ" is running out of space.
tempdev Initial size : 133,100 MB Growth: By 10 percent, Limited to 140000 MB
templog Initial Size : 5,475 MB Growth: By 10 percent, Unlimited
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Dec 23, 2014
I'm working on databases where statistics of some indexes (tables) are changing too frequently. Once I update them manually, one minute after they get 10-20% change, and five minutes after they get over 100% change. Tables get updated very frequently (multiple times in a second).
When I run a query to read from sys.stats, sys.dm_db_stats_properties and other dynamic views, I see that they were last updated when I did it manually, but the change rate overpassed the 500+20% (tables have multiples of 10K rows). Auto create and update statistics are set to true on all databases, and I don't know why sql server does not do that automatically.
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Jul 6, 2014
Running Frequently Transaction logbackup during Integrinty check DB /optimization job will cause any issue /impact as duration will extend ...
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May 14, 2008
When I launch Outlook, it takes forever for the program to finally open. With any inbound email, it stops processing whatever is underway at the time....and frequently there is a 2-3 second lag between keyboard input and what appears on the screen. SQLserver is usually consuming upwards of 1-gb of memory....help. Mike
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Jan 6, 1999
If I have unregistered a server for some time and I forget the sa password ,how can i register the server again.
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Jul 20, 2005
Hi,I have a big problem with a database in MS SQL SERVER 2000.the rows into the some tables, for the second time, have been mixed betweenthey without appearing reason.the application that uses the db is totally TRANSACTIONAL and they do notexist query that they do not have clause WHERE.The database is on a computer with NAS architecture.I have this problem for the first time in 5 years of use of MS SQL SERVERCan someone help me?TIA
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Dec 18, 2007
its meant to be so simple .. yet i just can not get this to work. i have a Sequence container which has a execute SQL task in it. The SQL query is simple . 'Select companyname from clientadmin where Licence = '217514'
Connection is Native OLE DBSQL Native Client. When i test connectio it succeeds
I used the build query option to build and test the SQL Query and it returned the company name
but when i execute the task i get the following error
[Execute SQL Task] Error: Executing the query "" failed with the following error: "Retrieving the COM class factory for component with CLSID {7816B7A3-CD60-4539-BD38-C35AFC61F200} failed due to the following error: 80040154.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
Once that hurdle is over how can i get the result into a variable called 'company' , type string ??
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Oct 15, 2006
Hi, I have the following problem
In a flat file I have 250000 rows when I them go on to the DB only 249995 come, 5 got lost
Not where it can spend the mistake the loggind does not say anything of mistake
Not which can be the reason of the problem
If someone save for that it can be spending this???
helps please.
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Mar 5, 1999
After rebuilding my SQL 6.5 server and restoring all of my drives I noticed that the mssql/data direcory didnt properly backup. I reinstalled SQL, applied SP5a, recreated my device and databases, and then replaced my dat files from my restores. The only database that I am affraid of is my Master. I can run Queries successfully against all my databases successfully. Is there anything else I need to do or should be worried about? I might be able to restore the master from a backup done earlier yesterday morning. But dont want to unless necessary.
Thanks in advance.
David
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Aug 8, 2007
I am using sp_helptext to generate script of stored procedure. However someone said sp_helptext loss something if stored procedure is big. That means the script is not completed. Is it true?
Thanks
ZYT
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Dec 6, 2006
hi,
Im using merge replication.I have created one publisher with dynamic filtering and i have creted two subscribers from it(pull subscription).It was working fine.but after sysnchronizing 2-3 times data from some tables went missing
can any one help me....
thanks and regards
Dhanya
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Jun 13, 2008
I am using SQL Server 2005.
I am trying to import data from CSV files into an SQL Server table using the Import wizard. The text qualifier is double quotes ("), column delimeter is a comma (,), first row has column names. One of the field name is "id", which is a GUID, whose datatype in SQL Server is uniqueidentifier. It looks like this in the file:
..."data","data","dbf7edf8-0ca8-4e53-91e3-5901cdc1819a","data"...
As you can see, there are no enclosing curly braces for the guid value. The DTS chokes on this and throws this error:
The value could not be converted because of a potential loss of data
If I add curly braces like this {dbf7edf8-0ca8-4e53-91e3-5901cdc1819a}, it imports with no problem.
Is there way to import this type of data, because there is no way I can edit these files, and I would prefer not changing the datatype of the id field?
Or is this a limitation of SQL Server?
Thanks,Bullpit
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Jul 23, 2005
Hi All,I'm trying to track down a mysterious problem we're experiencing inwhich updates and inserts to tables in our mssql2k server appear to be'disappearing.'To explain our situation:We have a web page (written in ASP, if that's relevant) on which weaccept enrollment information.When that page is submitted, the form data is passed to a storedprocedure on our mssql2k server, which performs several operations,all of which are wrapped in a transaction.In particular, the stored procedure performs an update operation on arecord in one table (i'll call it TableA) and an insert into anothertable (TableB).If the procedure encounters a problem (ie after each update / insertoperation in the procedure we test for IF @@Error<>0) it performs arollback, performs a select similar to the one immediately below, andthen RETURNs.SELECT '1' as error, 'Unable to update TableA' as errormsgIf the procedure doesn't fail any of the @@Error tests, thetransaction is committed, and a membership number is SELECTed to bereturned.SELECT '0' as error, @memnum as membershipnumberThe @memnum variable is populated within the transaction.Back in the ASP page we test both for the proc returning an emptyrecordset, or for it passing an explicit value in the error field, andpush the page to an error page if either of these conditions are met.If, on the other hand, none of these conditions are met, and themembershipnumber field in the recordset is populated with a validmembership number, we push to a confirmation page.This confirmation page receives the membership number in a sessionvariable, performs a SELECT against TableB (the table that receivedthe insert during the proc) using that membership number in the WHEREclause, and the resultant recordset is used to populate theconfirmation details on that page. That recordset is also then used topopulate the details of a confirmation email, which is automaticallysent by the confirmation page.And now here's our problem: we've become aware of a handfull of peoplewho have gone through the enrollment process, have received theconfirmation email containing the information they supplied asexpected, but the data appears to be entirely missing from our tables.By that I mean that the record in TableA does not appear to have beenupdated (under normal circumstances that record should have hadseveral flags set, and several other fields updated with informationsupplied by the person enrolling), and the record in TableB does notappear to have been inserted.In essence, looking at our tables, it *feels* like the transaction inthe stored procedure for that particular enrollment hit a problem andwas rolled back. However, the evidence that we have in the form of theconfirmation email argues strongly that the data must have existed inour tables (particularly in TableB), if only for an unknown period oftime.We're kind of at our wit's end to work out what is going wrong withthese enrollments. From my understanding of transactions (and I couldwell be wrong) any changes to data (ie updates, inserts etc) containedwithin are essentially 'invisible' to any other operation (ie theSELECT that happens in the confirmation page) until the transaction iscommitted, implying that the effect of the update and insert shouldhave been 'permanently' successful if no error code is received and ifa valid membership number was returned. I ask, because someone in ourteam has suggested that maybe the operations in the transaction'lasted long enough' in the tables to have been visible for the SELECTon the confirmation page to have worked, but were then subsequentlyrolled back, explaining why the confirmation email is appropriatelypopulated and why the data then appears to be missing. However, as Isaid, this doesn't match my understanding of how transactions behave.Sorry for the length of this post, but I felt it was best to explainthis as best as I could.Does anyone have any advice they can give us on this situation? ie,are there any known problems with operations in transactions 'bleedingover' into tables, but then being rolled back at some later point?Does anyone have any thoughts or suggestions on how we can furtherdiagnose this issue?Truly, any help will be immensely appreciated...Thanks in advance,M Wells
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May 17, 2007
I have a FoxPro dbf that includes From Milepost (f_mp) and To Milepost (t_mp) fields. These fields contain values between -1 and 9999.9999.
I don't have FoxPro installed, but when I attach the dbf to Access, I see the fields defined as datatype Double.
I have a SQL table that I'm trying to import the dbf data into. In that table the two fields are defined as datatype Real.
When I execute the task, it fails at the first milepost value with 4 digits to the left of the decimal point.
I read up on datatypes, then redefined the milepost fields as Floats, but nothing changed.
Any ideas or suggestions would be greatly appreciated.
ginnyk
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Mar 30, 2007
Dear friends,
everytime i used to open the package has a sql server configuration file saved and also has loggin enabled, with password for sensitive data storage given, it shows some errors and all the time the errors are with the created connection.
yes, i have given the right password at the time of opening it.
any idea?
thanks,
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May 30, 2006
During import from CSV i am getting following error "The value could not be converted because of a potential loss of data". My CSV file contains a column "years" and i have selected datatime in the import wizar. Can I scape from this error and import all my data.
Waqar
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Aug 22, 2007
we had setup merge replication on 2 db servers. For some reason, the subscription started failing a month back with the error " invalid object sysmergexxxx on the subscriber. I did a reinitialize and now all the changes on the subscriber which werent synced got deleted. I have tried all 3 log recovery tools with no luck. Is there any hope of recovering data. the last backup on the subscriber was a month ago.
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