AUTO_UPDATE_STATISTICS A Good Idea?
May 20, 2003
Can anyone tell me if turning on the AUTO_UPDATE_STATISTICS option will have any adverse effects on performance? I've read that it is possible for it to adversely affect performance, because SQL Server “takes a quick break to update database statistics in the middle of the day”. The book does not explain why and I'm always leery of simply accepting something, simply because I’ve read it from a book. This is the first time that I’ve ever heard this and cannot find anything from SQL BOL or any other source.
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Jul 23, 2005
Hi guysWe have a following problem. For security reasons in each table in ourDB we have addition field which is calculated as hash value of allcolumns in particular row.Every time when some field in particular row is changed we create andcall select query from our application to obtain all fields for thisrow and then re-calculate and update the hash value again.Obviously such approach is very ineffective, the alternative is tocreate trigger on update event and then execute stored procedure whichwill re-calculate and update the hash value. The problem with thisapproach is that end user could then change the date in the tables andthen run this store procedure to adjust hash value.We are looking for some solution that could speed up the hash valueupdating without allowing authorized user to do itThanks in advance,Leon
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Jan 28, 2008
I have a complex select statement that is used in several stored procedures. I decided that instead of having x number of T-SQL scripts with the same exact select statement that I would to put this query into a view and then do a select * from View. Recently an instructor told me that this was a bad idea and that anyone who uses a select * from anything should be fired. When I asked for his reasoning his response was to say the least abnoxious. I can understand why a Select * from Table might be a bad idea as the table definition can change, but the chances of a view changing seems much less likely.
Is a view a good idea in this case? Is the Select * from View really a bad idea?
Thanks
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Jun 11, 2008
Hi
I have about six different entities that can have zero or more note entities associated with them. The easy way to do this is obviously to have a different "note" table for each of the entities i.e. WorkItemNote, CustomerNote etc.. But I would much rather have a single "note" table since they would all be identical, so I came up with this design:
CREATE TABLE WorkItem
(
WorkItemGuid uniqueidentifier PRIMARY KEY DEFAULT (newid()),
-- rest of table declaration removed for bravity
)
CREATE TABLE Customer
(
CustomerGuid uniqueidentifier PRIMARY KEY DEFAULT (newid()),
-- rest of table declaration removed for bravity
)
CREATE TABLE Note
(
NoteId int IDENTITY(1,1) NOT NULL PRIMARY KEY,
ReferenceGuid uniqueidentifier NOT NULL,
Text ntext NOT NULL,
-- rest of table declaration removed for bravity
)
This way I can get notes associated with a given entity, either Customer or WorkItem, by just selecting from the Note table with its WorkItemGuid or CustomerGuid.
My question is: Is this the best approach to what I am trying to accomplish?
(ps: Apologies if "many to one" is not the right terminology)
Regards, Egil.
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Sep 14, 2006
Hi,
Today I discovered this command completely by accident and thought that ther are several places which we could use it in our apps.
Talking with a colleague, he is not to sure as it new to him too.
By using this to recover lost identity values, would this have any possible adverse effects on the table, indexes etc.
I can see potential problems when constraints are set between tables/keys. Anyone with any experience using this good and bad would be useful to hear.
Thanks
Adam
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Jan 29, 2008
What would happen if I dropped the distribution db?
I'm having problems configuring distribution and after searching, I found someone that claims they solved the same problem by dropping the distribution db. The resolution is the last post on this thread: http://www.ureader.com/msg/11563430.aspx
Is this safe to do? There are currently no publications and the distribution server is not configured.
Thanks
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Jul 20, 2005
Hi.I am wondering if it is a good idea to replicate sql server db filesusing frs.I don't really know how the frs works, sodoes frs replicates the whole database from time to time or just theportion that is changed?Also if the db is expected to change very often, and wouldn't it makethe whole system down?I wonder if it's a good idea just to make a backup of the database andcopy it.What's the usual practice?
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Nov 16, 2007
I am out of my element here but I have someone who is working on a project for me that entails him migrating our Access database to sql. He wants to load the sql software on our exchange server but our IT guy is saying this is not a good idea. Any thoughts???
Thanks,
Beth
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Feb 24, 2007
I am writing a web application that uses a Teradata database as the primary data source. While Teradata is great as a data warehouse and managing Terabytes of information it doesn't do as well when update or inserting. I was thinking of using a local SQL2005 MDF file to hold a few reference tables and an audit table to collect usage information and exception database to capture any errors.
There could be a few thousand users of the web application but no more than a couple hundred at a time.
I just trying to get some opinions on these technique. I am open to all comments and suggestions.
Thank You
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Sep 25, 2000
Hi,
Any pros and cons of putting sprocs into Source Safe?
Thanks,
Judith
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May 21, 2008
I have an application that automatically reads a lot of data from a third-party application into my database, via XML. For example, I might read a couple thousand rows-worth of XML data, one row at a time in a foreach loop.
To reduce the load on their server and database, I thought about putting a 2 second delay in between each of my automatic requests. Would this really help much, or is there enough overhead (setting up/tearing down connections, etc) with each request that it wouldn't reduce server load much anyway?
Is 2 seconds enough? Too little or too much?
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Sep 4, 2007
My db is about 80G, and I turned this option auto_update_statistice on
How can i know when this run? How can i say if this is running at inappropriate times?
Many thanks
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Mar 4, 2008
i have a table FORUM_REPLY it contain follwing fieldsquest_id,answer_id, reply_user_id.i want who is post most answer.so i need reply_user_id and max(no_of_answer).but following query given reply_user_id and no_of_answer onlySELECT reply_user_id,count(answer_id) as no_of_answer FROM FORUM_REPLY GROUP BY(reply_user_id)How to get max_no_of_answer?
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May 21, 2001
Hi all,
I am new to the DTS game - or at least to trying to do anything other than transfer rows between databases with identical structures.
I now need to create a far more complex DTS package to transfer data between an SQL Server database (I am using SQL Server 7.0) and an Oracle database. I have no trouble in making the connections and performing simple DTS's beween the two.
However, my current task is more complicated.
Problem 1:
In one database I would store fifty values as 5 five records each containing 10 values (i.e. has ten fields). However, in the other database these fifty values would all be stored as one record (i.e. one row with 50 fields). How could I go about creating a DTS to transfer this information?
Problem 2:
These values should only be transfered if certain conditions are met in an another unrelated table. For example, a flag in another table indicating that transfer of the said values should occur.
Any help with either of these problems would be much appraciated.
Thanks in advance,
Ross
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Nov 16, 2000
When one of the users log into the database via a thrid party application
they receive an error message:
2000/11/16 10:40:13.84spid51Error : 605, Severity: 21, State: 1
2000/11/16 10:40:13.84spid51Attempt to fetch logical page 7832 in database 'highview' belongs to object '1241055457', not to object 'application_data'.
2000/11/16 10:45:07.68spid46Getpage: bstat=0x1008/0, sstat=0x80002110, disk
2000/11/16 10:45:07.68spid46pageno is/should be:objid is/should be:
2000/11/16 10:45:07.68spid460x1e98(7832)0x49f900e1(1241055457)
2000/11/16 10:45:07.68spid460x1e98(7832)0x4810b86f(1209055343)
2000/11/16 10:45:07.68spid46... extent objid 0, mask 0/0, next/prev=0/0
2000/11/16 10:45:07.68spid46... retry bufget after purging bp 0x2da7e060
I tried running DBCC checkdb, newalloc,& checktable to fix the probelm and than droping the table and rebuilding it but not success, any suggestion are
more than welcome.
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Jun 21, 2002
If anybody can suggest the most efficient way to "page" the output from a big and wide table (about 7000000 records) in order to display on the web in the user requested sort order. Sort order could be on at least 7 different columns from 50 of returned.
I need to find a solution to move to the next and previous page.
Any Idea?
Dim
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Jul 23, 2004
what if I took this trigger and based it on a view rather then a table
CREATE TRIGGER TerminationUpdateTrigger ON EmployeeGamingLicense
FOR UPDATE
AS
INSERT INTO TERMINATION(Status,[TM #],LastName, FirstName, [SocialSecurityNumber], DateHired, Title)
SELECT STATUS, [TM#], LASTNAME, FIRSTNAME, [SSN#], HIREDATE, JOBTITLE
FROM Inserted
WHERE STATUS = 'TERMINATED'
CREATE VIEW dbo.Update_Terminations
AS
SELECT STATUS, TM#, LASTNAME, FIRSTNAME, SSN#, HIREDATE,
JOBTITLE
FROM dbo.EmployeeGamingLicense
WHERE (STATUS = N'TERMINATED')
Base the Trigger on this View rather then on the Table itself????
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Apr 27, 2008
Hi I'm new to sql and it would be great if someone could give some idea on how to do the following
This is the relational model:
Department(DeptNum, Descrip, Instname, DeptName, State, Postcode)
Academic(AcNum, DeptNum, FamName, GiveName, Initials, Title)
Paper(PaNum, Title)
Author(PaNum, AcNum)
Field(FieldNum, ID, Title)
Interest(FieldNum, AcNum, Descrip)
The question is :-
Which academics have the largest number of fields of interests? Return their academic number,
given name, family name, institution and total number of fields they are interested in. Your must use a
subquery in the sense that you must use 2 sql statements and use any of the following to connect both:-
1)Exists
2)Not exists
3)IN
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Sep 18, 2006
I have a table call CLIENTE and another table call ENDERECO where the CLIENTE table has the FOREIGN KEY of the ENDERECO table.
When I try INSERT COMMAND in C# this message is show.
The instruction INSERT conflicted with a constraint of FOREIGN FUNDAMENTAL "FK_CLIENTE_ENDERECO." The conflict happened in the database "E:ARQUIVOS DE PROGRAMASMICROSOFT SQL SERVERMSSQL.1MSSQLDATALINETEC.MDF", table "dbo.I ADDRESS", column 'IDENDERECO.'
The instruction was concluded.
I am a "little" lost.
Thanks.
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Mar 21, 2007
Hi there,
I have number of tasks in my control flow most of them are execute sql task. I want to update one of the column in my table when anyone of the task in the control get fails?
Please let me know if anyone have an idea how to do this.
Thanks and Regards
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Mar 3, 2004
Lets say I have to insert 60,000 or so records into SQL Server from another data source using the sqlTransaction class.
However if at any point an error should occur I would like to roll back any changes.
Would a transaction be a bad idea when dealing with this many records?
Thanks for any advice.
SA
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Mar 8, 2007
Dear Friends,I'm a junior DBA,
I've to prepare an online examination.
for this, I've three categories.
a)beginer level
b)intermediate level
c)expert level
again here subjects are 6. like sqlserver,oracle,c#,vb.net,html,javascript.
in these subjects, i've to select these three types of questions.
now how can i design for this requirement? shall i create three tables for beginer, intermediate,expert or shall i create 6 tables and write according that?
am i given correct inputs?
please give me an idea to design
thank you verymuch experts.
Vinod
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Jun 23, 2007
Having no more experience than reading books online, here is an interesting idea I would like to run by you guys and you can let me know if it is feasible or tell me I need to put the crack pipe down...
We are going to increase the number of disks in our SAN, and I was speaking with the SAN administrator and he mentioned the shuffling of logical drives to match the new space. He said he is going to have to go through quite a few combinations/permutations on figuring out the best configuration for what data goes on the old vs. new to get the optimal space.
Is this something that can be modeled out? I can write something that recursively figures it out, but why not explore fun ideas with tools that may be able to do it?
Thank you in advance,
John Hennesey
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Nov 7, 2007
Hi,
Does anyone have any idea waht this means:
aspnet_wp!resourceutilities!5!07/11/2007-10:32:00:: i INFO: Reporting Services starting SKU: Developer
aspnet_wp!resourceutilities!5!07/11/2007-10:32:00:: i INFO: Evaluation copy: 0 days left
It is take from the ReportServer log file.
Thanks in advance for any response.
Jon
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Sep 12, 2007
I need help regarding what is a collate and where to use.If any examples with INNER JOIN it could be more helpful....
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May 31, 2007
Hi,
I have a table that has the ff:
LastName varchar(50)
FirstName varchar(50)
PhotoPath varchar(50)
Now I want to create a form that can accept the LastName,Firstname and also can upload a picture which in turn the filename of the image will be the value for the PhotoPath field, and eventually displays it using the repeater control.
Your Help/Info. is highly appreciated...
Jeff
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Oct 6, 2007
Last night, I have this idea, but can not know if it can have a good performance and efficiency when the @CurrentPage is big.-------------------------------------------------------------------DATABASE:AdventureWorks DECLARE @CurrentPage intDECLARE @PageSize intDECLARE @OrderExpression nvarchar(100)DECLARE @Sql nvarchar(500)SET @CurrentPage = 1SET @PageSize = 10SET @OrderExpression = N' employeeid 'DECLARE @BigTop intDECLARE @SmallTop intSET @BigTop = @CurrentPage * @PageSizeSET @SmallTop = (@CurrentPage -1) * @PageSizeDECLARE @StartTime datetimeSET @StartTime = GETDATE()SET @Sql = N' SELECT TOP (' + CAST(@BigTop AS nvarchar(10)) + ') * FROM humanresources.Employee '+ ' EXCEPT '+ ' SELECT TOP (' + CAST(@SmallTop AS nvarchar(10)) + ') * FROM humanresources.Employee ORDER BY ' + @OrderExpressionEXEC sp_executesql @SqlDECLARE @EndTime datetimeSET @EndTime = GETDATE()SELECT DATEPART(s,@EndTime-@StartTime)SELECT DATEPART(ms,@EndTime-@StartTime)GO-----------------------------------------------------------------
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Oct 29, 2004
I am looking for a good reference on hardware specs for a dedicated SQL server. I don't want to talk to vendors, because I'm not looking to get snowed. Does anyone know of any resources? The server is to be a dedicated dataserver, for about 300 clients.
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Nov 16, 2006
Hi.. Never used MSSQL 2000 db. I have this website that uses mssql2000. I want to export it and convert db in mysql. Please help me understand how i can do that. I have all login info..
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Aug 3, 2004
Hi, all..
One database called POS in a server A is replicated with another server B with merge replication.
Server A is distributor and publisher.
I tried to replicate POS db it keeps giving me error following.
"SQL Server Enterprise Manager could not retrieve information about database 'POS'
Error 21776: [SQL-DMO] The name 'POS was not found in the ReplicationDatabase collection. If the name is a qualified name.
user [] to separate various parts of the name, and try again."
When other try it gives following error..
SQL Server Enterprise Manager could not enable database 'POS' for merge replication.
Error 20736: [SQL-DMO] This object has been dropped from the server.
I did all I can do..
I reinstalled sql server and tried again.. but it gives same error..
Does anyone has any idea of this problem????
Please post any idea.
Thank you...
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May 23, 2007
Good morning
In messages system i have table to store messages and another table to contain the links which the message is posted through
Now i want to delete a link but i don't want to delete the message sent through this link
The problem:
When displaying the message sent what will be found in the link field (i.e. for the deleted link)
If any one has a good idea for doing that please reply to me
I don’t want the sql code
I want just the idea
Thanks
kind regards
mohammed Al Maghraby
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May 23, 2007
Good morning
In messages system i have table to store messages and another table to contain the links which the message is posted through
Now i want to delete a link but i don't want to delete the message sent through this link
The problem:
When displaying the message sent what will be fount in the link field (i.e for the deleted link)
I tried to move the deleted link data to separate table (EX: deletedLink) but if the user added new link with the same name as the deleted link? The problem mainly in when displaying the message sent i will have the same link twice one for the deleted and the other for the added one.
If any one has a good idea for doing that please reply to me
I don’t want the sql code
I want just the idea
Thanks
mohammed Al maghraby
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