What Are Some Of The Drawbacks To Using Triggers?
Mar 5, 2008What is the answeof this ?
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DTS Drawbacks
Dec 26, 2006I am trying to compile a case of why DTS packages need to be migrated to SSIS packages. Is there any document, whitepaper which can provide me drawbacks in DTS?
Thanks,
Vijay.
SQLDatasource Benefits/drawbacks - When To Use?
Apr 14, 2008Hi,
I've never really used the SQLDatasource, I usually fill a dataset & use that. When would you use an SQLDatasource? I notice it doesn't return dataviews but I also noticed that you don't need to open the conenction. Any ideas on best practice?
Many thanks
Benefits/drawbacks With NVarChar(max)
Feb 15, 2006Hi,
I wonder if there are any drawbacks with NVarChar(max) contra e.g. NVarChar(40) when it comes to performance and amount of storage used?
Are there other arguments to use e.g. NVarChar(40) than that you have more control of how long the strings are when you set the upper limit?
I'm using Sql Server 2005.
Tomsi
AWE/Lock Page In Memory Drawbacks? Min/Max Settings, Memory Issues
Oct 11, 2007I've been researching AWE to determine if we should enable this for our environment.
Currently we have a quad core box with 4 gb of RAM (VMware). OS: Windows 2003 std, SQL Server 2005 std. 3GB is not set but will be as soon as we can perform maintenance on the server.
I have read mixed feedback on AWE, either it works great or grinds you to a hault. I would assume that the grinding to a hault is due to not setting the min/max values correctly or not enabling the lock page in memory setting.
We only have one instance of SQL on the server and this box won't be used for anything else aside from hosting SQL services. We do plan on running SSRS off of this server as well.
1. Will running SSRS and enabling AWE cause me problems? Will I have to reduce the max setting by the SSRS memory usage or will it share and play nice?
2. How do I go about setting the Max value? Should it be less than the physical RAM in the box? Right now its set to the default of 214748364, even if I don't enable AWE should this default value be changed?
3. It seems that even at idle the SQL server holds a lot of memory and the page file grows. If I restart the process in the morning, memory usage in taskmon is at 600mb or so. By the end of the day, its up around 2gb. How can I track down whats causing this, should this even concern me?
4. The lock Page in memory setting worries me. Everything I've read on this seems to give a warning about serious OS and other program support degradation. In some cases to the point where they have to restore the settings on the server before they can bring it back up. What are your thoughts on this.
Multiple Triggers On A Table Or Encapsulated Triggers
May 12, 2008This isn€™t an problem as such, it€™s more of a debate.
If a table needs a number of update triggers which do differing tasks, should these triggers be separated out or encapsulated into one all encompassing trigger. Speaking in terms of performance, it doesn€™t make much of an improvement doing either depending upon the tasks performed. I was wondering in terms of maintenance and best practice etc. My view is that if the triggers do totally differing tasks they should be a trigger each on their own.
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Triggers
Jan 3, 2007Is it possible to achieve this using triggers:When someone tries to delete a row in table A, the trigger should first delete a corresponding row in table B and then delete the row in table A. The reason being that, there is a foreign key set on Table B that references table A. So any attempt to delete a row in table A without deleting the corresponding row from B, throws an error.
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May 31, 2007Hello All,
I have to write Trigger for Update,
I have two tables, one is for storing records of current values, and one is for storing history of values.
How to Write a Trigger on Main Table. As we have Inserted and Deleted Tables through which we can find Values, We dont have any Table for UPDATED Values.
Help me.
General Problem
Triggers - Is This Possible?
Jun 15, 2007I need to create a set of rows every time a new row is inserted into a table.
Example (I think this would work)...
select @insertedId = column1 from insertedselect @id = column1 from table1 where column2 in (select column1 from table2 where column2 = @insertedId)insert into table3 values(x, y, @id)
Is it possible to do the same kind of thing in a situation where the select statement returns multiple values and execute the insert statement for each of these values?
Also, if table3 was in fact the table on which the trigger acts, would it then be executed for every row created by the trigger?
Sorry if I sound confused. I am.
Triggers
Dec 6, 2007
hi everybody..i tried to put thios loop in sql server 2000 But it is not taking The @ action taken value ,,it is only taking the default value of @actiontaken value.
SET @ActionTaken = 'A'
IF (@AType = 'A')IF @Status= 'O' IF (@KAppInd ='Y' AND @DAppInd=null)BEGINSET @ActionTaken = 'O'END
Please tell me other option in sql server 2000 for setting variable value based on conditions
Triggers In .net
Dec 21, 2007Hi using triggers i try to insert some values in to my 2 tables: But its showing teh error as "The request for procedure 'Triginsert123s' failed because 'Triginsert123s' is a trigger object." This is my code in back end: sqlcon.Open() Dim cmd As New SqlCommand("Triginsert123s '" & txtID.Text & "','" & txtName.Text & "','" & txtRole.Text & "','" & txtDep.Text & "'", sqlcon) cmd.ExecuteNonQuery() sqlcon.Close() My trigger is: CREATE TRIGGER Triginsert123s ON [dbo].[EmpRole] FOR INSERT AS declare @Eid as tinyint, @Ename as varchar(50), @Role as char(10) Insert into Emprole(Eid,Ename,Role) values(@Eid,@Ename,@Role) insert into empdep(eid,dep) values(@eid,@Role) Whats the probs?, Plz i am new to triggers help me,
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May 9, 2004Hi All,
I'm using triggers to handle my transaction log to cature inserts and updates. It works fine except if the user clicks on the Save button more than once, the trigger is fired and the record is written to the log even if the record wasn't changed. Does anyone know how to check if the record was actually changed so that it isn't written to the table if it wasn't?
Thank you,
Mike
SQL Triggers
Jun 17, 2004When I execute a stored proc from my asp.net page, will the results of a trigger be returned to my program?
For instance say my stored proc is:
Update Employees set
(Lastname = @Lastname)
where ID = @ID
And my trigger is:
CREATE TRIGGER tr_Employees_U on Employees FOR UPDATE AS
IF UPDATE(lastname)
BEGIN
RAISERROR ('cannot change lastname', 16, 1)
ROLLBACK TRAN
RETURN
END
GO
It seems like since this is an AFTER trigger that my webpage would actually get a valid return code from my stored procedure however the trigger would rollback those changes correct? Or would the trigger get fired and send it's return code to my webpage?
Instead Of Triggers
Mar 5, 2006I'm trying to write an instead of trigger for a view in SqlExpress...the table and views are defined as such:CREATE TABLE [dbo].[Work]( [WorkID] [int] IDENTITY(1,1) Primary Key, [ResourceID] [int] NOT NULL, [TaskID] [int] NOT NULL, [WorkDate] [datetime] NOT NULL, [WorkQuantity] [float] NOT NULL, [IsEstimate] [bit] NOT NULL DEFAULT ((0)), [Project] [int] NOT NULL,);CREATE VIEW [dbo].[ActualWork]ASSELECT WorkID, ResourceID, TaskID, WorkDate, WorkQuantity, ProjectFROM dbo.[Work]WHERE (IsEstimate = 0);CREATE VIEW [dbo].[EstimatedWork]ASSELECT WorkID, ResourceID, TaskID, WorkDate, WorkQuantity, ProjectFROM dbo.[Work]WHERE (IsEstimate = 1);Given that, what is wrong with the following create trigger statement:Create Trigger trg_InsertActualWork ondbo.ActualWork Instead of InsertasBEGIN Insert into dbo.Work( ResourceID, TaskID, Project, WorkDate, WorkQuantity, IsEstimate ) values ( inserted.ResourceID, inserted.TaskID, inserted.Project, inserted.WorkDate, inserted.WorkQuantity, 0 );END
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Dec 4, 2001l'm trying to build a trigger on a table. The reason for the trigger is to check a certain field for the first three characters if it has ie abc it must update another field in this case loanbook to newabc.How do l write the trigger so that it also check if exists and perform the updates. Please help its Urgent. l've listed the trigger below.
CREATE TRIGGER UpdTest_TRGData
ON Test_TRG
FOR insert,Update AS
IF left('Loan_No',3)='ABC'
update Test_TRG
set loanbook = 'NEWABC'
else
IF left('Loan_No',3)='DEF'
update Test_TRG set
loanbook = 'NEWDEF'
where loanbook is null
else
update Test_TRG
set loanbook =left('Loan_No',3)
where loanbook is null
Triggers
Dec 5, 2001I'm a bit confused on this bit please elaborate : " FROM Test_TRG t INNER JOIN inserted i ON t.PK = i.PK ".
The PK is on which field? Basically this trigger should ensure that on insertion of o new loan if
The left(loan_no,3)=MCG and its null then NEWMCG
left(loan_no,3)=MCG and its null then NEWMCG
left(loan_no,3)=KVS and its null then NEWKVS
left(loan_no,3)=MFS and its null then MFS
left(loan_no,3)=TCR and its null then TCR
left(loan_no,3)=ABL and its null then ABL
Listed below is what l've tried to do but l'm missing the PK part.Otherwise everything else you explained
in the script is clear. Thanks man its urgent. When l parse the query its fine , but When l run it
l get an error.
CREATE TRIGGER UpdTest_TRGData
ON Test_TRG
FOR INSERT, UPDATE
AS
UPDATE Test_TRG
SET LoanBook = CASE WHEN LEFT( i.Loan_No, 3 ) = 'MCG' THEN 'NewMCG'
WHEN LEFT( i.Loan_No, 3 ) = 'KVS' AND i.LoanBook IS NULL THEN 'NewKVS'
WHEN LEFT( i.Loan_No, 3 ) = 'MFS' AND i.LoanBook IS NULL THEN 'MFS'
WHEN LEFT( i.Loan_No, 3 ) = 'ABL' AND i.LoanBook IS NULL THEN 'ABL'
WHEN i.LoanBook IS NULL THEN LEFT( i.Loan_No, 3 )
END
FROM Test_TRG t INNER JOIN inserted i ON t.PK = i.PK
-- Fill in Primary Key or other Join Column(s)
WHERE LEFT( i.Loan_No, 3 ) = 'MCG'
OR ( LEFT( i.Loan_No, 3 ) = 'KVS' AND i.LoanBook IS NULL )
OR i.LoanBook IS NULL
====== Error message =================
Server: Msg 207, Level 16, State 3, Procedure UpdTest_TRGData, Line 11
Invalid column name 'PK'.
Server: Msg 207, Level 16, State 1, Procedure UpdTest_TRGData, Line 11
Invalid column name 'PK'.
Triggers
Jan 11, 2002I an loading records from a flat file into a table, which is done everyday by a scheduled job in SQL Server 7.0.
How can I make sure that if the job is run twice in a day for some reason that the same rows are not inserted into the table again? Do I have to write a insert trigger on the table ??? If so how can I achive the objective ??
Triggers
Jan 31, 2002Hi! i have a simple question...is possible to create a trigger who affect multiple tables?
The idea will be something like this:
create trigger mytrigger
on sales, users
as...
of course, this don´t work :)
Triggers
Aug 3, 2001Hey everyone...
I'm working on trying to figure out how to update the child table from the parent via a trigger. This works fine as long as the value is in the child table. If it's not, then I get my foreign key violation. So, My next thought was to simply put in a begin tran / rollback tran within the trigger... My question is this : If I have multiple triggers on the parent table all based on the update of the key field (and the child tables... some 7 of them) all have FK's, if I rollback one trigger does it rollback the entire transaction? Or just the functionality of that trigger? From what I've read, it appears as if it's the entire transaction... if so, how do I get a trigger to 'ignore' itself or not fire based on a select criteria that i have within that same trigger...
Thank you...
Triggers
Oct 24, 2001I just tried creating my first trigger and I'm a little bit confused. I am trying to see if certain fields have changed and will do that by checking the values of the fields in the "master" table and the "Inserted" table. I wasn't sure which table would have the old data and which would have the new, so I created the following trigger to help me determine which was which:
CREATE Trigger upd_cost_master On tbl_cost_master
For Insert, Update As
Declare @U_Name varchar(65)
Declare @O_Name varchar(65)
Select @U_Name=I.submitted_by, @O_Name=O.submitted_by
From tbl_cost_master O Inner Join Inserted I On O.autokey = I.autokey
Print 'Inserted: ' + @U_Name
Print 'tbl_cost_master: ' + @O_Name
Commit Tran
To my surprise, @U_Name and @O_Name contained the same values. I though that one table contained the old values and one contained the new. Was I wrong? If so, is there anyway to compare the Old and New values through a trigger?
Chris
Triggers....
Jul 20, 2000Hi,
I'm using SQL Server 7.0. I have an insert trigger on table t05r. I populate table t05r with a DTS package. The trigger is supposed to add the record which was inserted into t05r, into t39r. After I run the DTS package to populate t05r, I checked t39r and no records where added. What is going wrong? Is it that DTS uses bulk copy and triggers don't fire on bulk copy?
Any help would be greatly appreciated.
Thanks in advance,
Darrin
Triggers
Nov 1, 1999I have an insert trigger on table A which inserts records into table B.
This insertion into B fails( or may fail ) at certain conditions.
I do not want the insertion into A to be affected because of this. Any ways to achieve this ?
Triggers
Oct 8, 1999Hi,
I have 3 tables A,B C and Triggers on each table like.
for insert/update on table 'C' calculates sum(xxfield) and updates
table 'B'.
for insert/update on table 'B' calculates sum(yyfield) and updates
table 'A'.
This works fine if I insert rows OneByOne.
Problem :- Doesn't work if I post entries(hundreds) in to table 'C' using a Query.
whats happening. Can anyone help Me????????
TRIGGERS
Nov 12, 2001How do I know if the triggers on table has been disabled or not. Thanks for your ideas!!!!
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Nov 21, 2002Hello,
I've update triggers on my table, But for some of the transactions, I don't want the triggers to fire. I know in Sybase there are set triggers off. In MS SQL, Is there any similar commands which will set triggers off for particular sql statements.
Thanks A Lot
Sejal
Triggers In SQL
May 1, 2003Hi! I am having trouble with setting triggers while doing my project. The project is on ATM machine driven through SQL. So I have Date of Transaction in one table and Account Expiry in another.
I want to set the trigger to check Account expiry when doing transaction so i wrote T-SQL
select........
getDate()-Dateoftransaction=expiry
begin '...'
end
the system saying I have got an error near the word 'begin'.
I am desperately needing help. running out of ideas.
Thanks in advance.
Triggers
Jan 18, 2005I need to create an after insert, update and delete trigger on the same table. Can I create one trigger that would have all three operations in it or I need to create three separate triggers? Thanks for your help.
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Feb 23, 2006I have not used triggers before and wanted to know if it was approproate for my issue:
When a new user registers via the web, a record is inserted into the "student" table. I would also like to insert a record into the "StudentCourse" table that adds this new student to a class (studentID, CourseID). I thought I could look into a trigger or stored procedure for this. The problem is that I do not want to mess with the programming side of it as it is an off the shelf system and written in Java/JSP, so I would like to handle this in the DB.
Thanks in advance,
Need Help With Triggers
Aug 29, 2007I am not actually sure if Triggers are the solution to my problem, but I have no experience with them and need help understanding if they will solve my problem.
Users that Access the database through our Front End Software can search on any field (indexed or not). For the most part, they search on indexed fields, but the problem is when they enter and empty string and attempt a search.
The Query that is passed to SQL essentially searches for everything - example below:
SELECT FieldA, FieldB, FieldC FROM Table WHERE IndexedField LIKE ''%'' ORDER BY IndexedField
The result of this is a timeout after 60 seconds and the server being practically coming to a halt during that wait. All users trying to make reads or writes are queued behind that query and it appears as though they are frozen. I have done a lot of monitoring with Profiler to figure out the problem, but I am stuck on how to stop it. The issue lies with the users and that is something I cannot fix. The Front End software cannot be modified. I cannot limit what they search on nor can I limit the fields they can search on.
Being that I can't do anything there, I was hoping I could intercept this query when SQL receives and possibly time it out faster. The queries follow a format, so I was hoping a trigger would do the trick.
Please provide any ideas or input that may help solve my problem. Also, if anybody has any good links to help me with triggers if that will take care of the problem.
EDIT: After doing some reading it is looking like triggers may not be applicable to my problem, but I am still looking for a solution.
Thanks in advance,
Don
SQL Triggers
Apr 3, 2008Is Cascedaing of Triggers possible..??
(Cascading means by one trigger firing another trigger and so on..)
Triggers
Jun 7, 1999I am attempting to place an update trigger on a column. The following is incorrect:
CREATE TRIGGER cus_name
ON dbo.customertable
FOR UPDATE AS
IF UPDATE(cus_name)
INSERT INTO AUDITTABLE(AUD_TABLENAME,AUD_COLNAME,AUD_OLD,AUD_N EW,AUD_DATE,LANID,COMPNO)
VALUES ('customertable','cus_name',deleted.cus_name,inser ted.cus_name,GETDATE(),inserted.lanid,inserted.com pno)
Does anybody know how to do it correctly?
Triggers
Nov 23, 1998I came for a new assignment.
Here, we've got about 70 tables and almost each table has got 3 triggers. So, in total, we have about 200 triggers, which makes the process cumbersome.
Is there a way to get rid of these triggers?
Can we replace the trigges with something else?
or any best way to debug triggers?
Thanks for your help.
Mohan.
Triggers
Oct 31, 2001How do I query any data that is changed through a trigger. IN oracle you would use .new or .old to query the data. All I can find is temporary tables called Inserted and deleted but dont seem to be able to query these tables. I need to update other tables with data that was changed in the original table through a trigger.
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