Help With Performance On A Conditional Trigger

Feb 27, 2004

I have a pretty massive conditional trigger. If there is another way of going about this, please let me know. But I'm populating a temp table with records and based on many conditions, I am transforming this data to another table in a corrected format. These conditions I am using reference the final table in many ways, and this seems to become slower and slower as the final table grows larger.

Take a look and see if you can help me please.

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Conditional Trigger

Jul 17, 2006

I have a trigger that updates values in a table when col2 is updated by a stored procedure.

I'd like to make this a conditonal trigger to prevent negative values from being inserted in the table. I'm not familiar with the syntax of triggers enough to get this to work and I've search for a reference with no luck.

Here's the current trigger code:


Code:

FOR INSERT, UPDATE
AS
UPDATE table1
SET col4= col1 - col2 - col3



I need to evaulate (col1 - col2 - col3) to see if it's less than zero. If it is, I want to set col4=0.

This is what I've tried, but it doesn't work. Any help is appreciated:


Code:

FOR INSERT, UPDATE
AS
select col1, col2, col3 from table1
if (col1 - col2 - col3) < 0
UPDATE table1
SET col4 = 0
else
UPDATE table1
SET col4= col1 - col2 - col3

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Conditional Trigger

Feb 22, 2008

Hello,

I have a situation where I'd like to fire a trigger only when certain conditions are met for data that's inserted into it's parent table.

Here is what I'm working with -

The PropertyScenarioIndex table currently contains this data:
PropertyID ScenarioType ScenarioID
1732 financing 1
1732 financing 2
1732 financing 3
1732 income_expense 1
1732 income_expense 2

The PropertyScenarioIndex table has a trigger on it (the one that needs to be made conditional) whose purpose is to automatically insert rows into another table called IncomeAndExpenseData to make entries easier for the user in that table. Here is the trigger:




Code Snippet

CREATE TRIGGER addstandardIncomeAndExpenserows ON PropertyScenarioIndex
AFTER INSERT
AS
insert into IncomeAndExpenseData
select
properytID = t1.propertyID,
scenarioID = t1.scenarioID,
itemID = t2.itemID,
itemvalue = null,
monthitemvalue = null
from PropertyScenarioIndex t1
cross join IncomeAndExpenseCodes t2
where
t1.propertyID+t1.scenarioID in (select propertyID+scenarioID from Inserted)
and t2.standarditem = 1
With the trigger as it is above, when the user tries to enter the following into PropertyScenarioIndex:
PropertyID ScenarioType ScenarioID
1732 income_expense 3
an error message appears that says Violation of PRIMARY KEY constraint 'PK_IncomeExpenseData'. Cannot insert duplicate key in object 'IncomeExpenseData'.

Is there some way to include code in the trigger that makes it fire only when the data inserted into the PropertyScenarioIndex table has a ScenarioType of 'income_expense'?

Note: in the where statement of the trigger above I have also tried this:




Code Snippet

where
t1.propertyID+t1.scenarioID in (select propertyID+scenarioID from Inserted where scenariotype = 'income_expense')but got the same error message as noted above.

Thanks, Knot

P.S. The primary keys in the PropertyScenarioIndex table are PropertyID, ScenarioType, ScenarioID and the primary keys in the IncomeExpenseData table are called PropertyID, ScenarioID, ItemID.

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Jan 25, 2008

Consider the following two functionally identical example queries:Query 1:DECLARE @Name VARCHAR(32)SET @Name = 'Bob'SELECT * FROM EmployeesWHERE [Name] = CASE WHEN @Name IS NULL THEN [Name] ELSE @Name ENDQuery 2:SELECT * FROM Employees WHERE [Name] = 'Bob'I would expect SQL Server to construct an identical QEP under the hoodfor these two queries, and that they would require essentially thesame amount of time to execute. However, Query 1 takes much longer torun on my indexed table of ~300,000 rows. By "longer", I mean thatQuery 1 takes about two seconds, while Query 2 returns almostinstantly.Is there a way to implement a conditional WHERE clause withoutsuffering this performance hit? I want to avoid using the IF...THENmethod because I frequently require several optional parameters in theWHERE clause.Thanks!Jared

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Feb 15, 2005

On the database that I am maintaining we are having some data integrity issues between our Logon table and another sub table that stores the LogonId.

The best solution would be to put in a foreign key, but that is going to require a lot of work and a lot of code changes for the entire system. This is what we plan to do, but this is not a quick fix. We need something that can be implemented quickly.

The easiest and quickest fix is to check this sub table to see if the LogonId is in the sub table and the row is marked as Active or Working. If it is then we will abort the deletion and raise an error. Otherwise the delete should happen normally.

Is aborting the deletion as simple as :

<code>
Delete From deleted
Where LogonId = @myId
</code>

Or am I missing something?

Thanks for the help,
Tim

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Mar 14, 2006

Is there any way to create a "Conditional Insert Trigger"
My Scenario is this;
When a user adds an email address to the database, I want to look to see if the email address is like '%@acme-holdings%' and if it is then to change the value to 'Not allowed', otherwise to leave it alone and go ahead with inserting the original email address

TIA

ICW

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Jul 3, 2006

I need some help here in creating a conditional update trigger. The purpose of this trigger would check to see if a contact already exist in the database on an insert and update only the fields that are null.

So How would I compare each field from the CONTACTS Table against my INSERTED Table?

Inserted.FirstName (COMPARE) Contacts.Firstname

Inserted.LastName (COMPARE) Contacts.LastName

Inserted.Email (COMPARE) Contacts.Email



I will be using the email address as the check for the duplicate record and if a duplicate is found... Instead of not allowing the insert I want to compare the existing record and update any fields that are NULL in Contacts with Inserted.

I have no idea on how to compare all of the fields.



Any help appreciated.

sadler_david@yahoo.com

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Too Busy To Implement A Trigger? Nor A Conditional Update Query?

Dec 20, 2004

Hi:

In a very busy SQL2000 enterprise edition server with 8GB memory and 6 cpus sp3, I could not install a update trigger, unless all the appl connections are dropped. For this 24 HR running svr, could do it.

then I try to run a query as follows:

if exists (select rfABC.* A
from rfABC inner join remoteSvr.XYZDB.dbo.vwIP L
on A.Address = L.address and
A.metro <> L.metro
begin
print ' ---- Yes metroID <> LAMetro, start job exec.... -----'

insert into tempCatchMetroIDGPRS
select rfABC.*, metro, getdate()
from rfABC inner join remoteSvr.XYZDB.dbo.vwIP L on rfABC.Address = L.address and rfABC.metro <> L.metro

update rfABC A
set A.metro = L.metro
from rfABC A inner join remoteSvr.XYZDB.dbo.vwIP L on A.Address = L.address and A.metro <> L.metro
end
else
begin
print ' ---- no metroID <> LAMetro, skip job exec.... -----'
end

------------------------------
this query hang there could not execute. When I took off the if ... else condition, it run with like 0 second. Wondered if a 'busy' (which updates the IP address continueously) could cause above issues...

thanks
David

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Jul 23, 2005

I have a multi-part question regarding trigger performance. First ofall, is there performance gain from issuing the following within atrigger:SELECT PrimaryKeyColumn FROM INSERTEDopposed to:SELECT * FROM INSERTEDSecondly, what is the optimum way to determine which action fired anAFTER trigger that is defined for INSERT, UPDATE, DELETE? Is itsomething similiar to:IF NOT EXISTS(SELECT * FROM DELETED)--sql block for insertELSEIF NOT EXISTS(SELECT * FROM INSERTED)--sql block for deleteELSE--sql block for updateor is there a superior method?Lastly, is checking @@ROWCOUNT at the beginning of an AFTER trigger thebest way to differentiate between multiple rows being affected or justa single row? Can using this @@ROWCOUNT test fail? Are there anysituations where it would return erroneous results?I realize I'm being somewhat nitpicky on these matters but any feedbackwould be greatly appreciated!

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Oct 25, 2000

I have a very complex trigger on a table, and the performance has always been poor. I always attributed this to the large number of operations being performed. However, we recently upgraded to SQL 7.0, and I was finally able to watch what was really happening with the Query Analyzer's graphical execution plan. Much to my surprise, nearly all of the cost of the update is in simply selecting a few values from the INSERTED table.

Here is a simple update statement that does nothing, but causes the trigger to fire:

update BillHeader
set Status = Status
where pkBillHeader = -2135366980


The following statement is contained in the trigger:

select @pkBillHeader = pkBillHeader,
@NewStatus = Status,
@ServiceProvID = ServiceProvID,
@CareDocNum = CareDocNum,
@BillType = BillType,
@pkClaim = fkClaim
from inserted

According to the query analyzer, this is 98% of the total cost of the query!

Is this correct? Is the query analyzer just being fooled, and something else is really eating up all of this time?

If this is correct, is there any other way to get this data? I could get just the primary key (pkBillHeader) from the INSERTED table, then look up the rest of the values from the "real" table, but I don't see how this would help.

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Mar 7, 2008



Hello everyone,

Is there a way in order to execute a subscribed report based on a certain criteria?

For example, let's say send a report to users when data exist on the report else if no data is returned by the query
executed by the report then it will not send the report to users.

My current situation here is that users tend to say that this should not happen, since no pertinent information is contained in the report, why would they receive email with blank data in it.


Any help or suggestions will be much appreciated.

Thanks,
Larry

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Dec 15, 2006

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=SWITCH(Fields!Wrap.Value >= 3, "Red", Fields!Wrap.Value < 3, "Green")

I already tried =iif(Fields!Wrap.Value >= 3 , "Red", "Green") and got the same results.

Is it because this is a matrix report? What am I doing wrong?

Thanks in advance . . .

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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

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Nov 14, 2006

Hey,

I'm new to this whole SQL Server 2005 thing as well as database design and I've read up on various ways I can integrate business constraints into my database. I'm not sure which way applies to me, but I could use a helping hand in the right direction.

A quick explanation of the various tables I'm dealing with:
WBS - the Work Breakdown Structure, for example: A - Widget 1, AA - Widget 1 Subsystem 1, and etc.
Impacts - the Risk or Opportunity impacts for the weights of a part/assembly. (See Assemblies have Impacts below)
Allocations - the review of the product in question, say Widget 1, in terms of various weight totals, including all parts. Example - September allocation, Initial Demo allocation, etc. Mostly used for weight history and trending
Parts - There are hundreds of Parts which will eventually lead to thousands. Each part has a WBS element. [Seems redundant, but parts are managed in-house, and WBS elements are cross-company and issued by the Government]
Parts have Allocations - For weight history and trending (see Allocations). Example, Nut 17 can have a September 1st allocation, a September 5th allocation, etc.
Assemblies - Parts are assemblies by themselves and can belong to multiple assemblies. Now, there can be multiple parts on a product, say, an unmanned ground vehicle (UGV), and so those parts can belong to a higher "assembly" [For example, there can be 3 Nut 17's (lower assembly) on Widget 1 Subsystem 2 (higher assembly) and 4 more on Widget 1 Subsystem 5, etc.]. What I'm concerned about is ensuring that the weight roll-ups are accurate for all of the assemblies.
Assemblies have Impacts - There is a risk and opportunity impact setup modeled into this design to allow for a risk or opportunity to be marked on a per-assembly level. That's all this table represents.

A part is allocated a weight and then assigned to an assembly. The Assemblies table holds this hierarchical information - the lower assembly and the higher one, both of which are Parts entries in the [Parts have Allocations] table.

Therefore, to ensure proper weight roll ups in the [Parts have Allocations] table on a per part-basis, I would like to check for any inserts, updates, deletes on both the [Parts have Allocations] table as well as the [Assemblies] table and then re-calculate the weight roll up for every assembly. Now, I'm not sure if this is a huge performance hog, but I do need to keep all the information as up-to-date and as accurate as possible. As such, I'm not sure which method is even correct, although it seems an AFTER DML trigger is in order (from what I've gathered thus far). Keep in mind, this trigger needs to go through and check every WBS or Part and then go through and check all of it's associated assemblies and then ensure the weights are correct by re-summing the weights listed.

If you need the design or create script (table layout), please let me know.

Thanks.

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Jul 20, 2005

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Generic Audit Trigger CLR C#(Works When The Trigger Is Attached To Any Table)

Dec 5, 2006

This Audit Trigger is Generic (i.e. non-"Table Specific") attach it to any tabel and it should work. Be sure and create the 'Audit' table first though.

The following code write audit entries to a Table called
'Audit'
with columns
'ActionType' //varchar
'TableName' //varchar
'PK' //varchar
'FieldName' //varchar
'OldValue' //varchar
'NewValue' //varchar
'ChangeDateTime' //datetime
'ChangeBy' //varchar

using System;
using System.Data;
using System.Data.SqlClient;
using Microsoft.SqlServer.Server;

public partial class Triggers
{
//A Generic Trigger for Insert, Update and Delete Actions on any Table
[Microsoft.SqlServer.Server.SqlTrigger(Name = "AuditTrigger", Event = "FOR INSERT, UPDATE, DELETE")]

public static void AuditTrigger()
{
SqlTriggerContext tcontext = SqlContext.TriggerContext; //Trigger Context
string TName; //Where we store the Altered Table's Name
string User; //Where we will store the Database Username
DataRow iRow; //DataRow to hold the inserted values
DataRow dRow; //DataRow to how the deleted/overwritten values
DataRow aRow; //Audit DataRow to build our Audit entry with
string PKString; //Will temporarily store the Primary Key Column Names and Values here
using (SqlConnection conn = new SqlConnection("context connection=true"))//Our Connection
{
conn.Open();//Open the Connection
//Build the AuditAdapter and Mathcing Table
SqlDataAdapter AuditAdapter = new SqlDataAdapter("SELECT * FROM Audit WHERE 1=0", conn);
DataTable AuditTable = new DataTable();
AuditAdapter.FillSchema(AuditTable, SchemaType.Source);
SqlCommandBuilder AuditCommandBuilder = new SqlCommandBuilder(AuditAdapter);//Populates the Insert command for us
//Get the inserted values
SqlDataAdapter Loader = new SqlDataAdapter("SELECT * from INSERTED", conn);
DataTable inserted = new DataTable();
Loader.Fill(inserted);
//Get the deleted and/or overwritten values
Loader.SelectCommand.CommandText = "SELECT * from DELETED";
DataTable deleted = new DataTable();
Loader.Fill(deleted);
//Retrieve the Name of the Table that currently has a lock from the executing command(i.e. the one that caused this trigger to fire)
SqlCommand cmd = new SqlCommand("SELECT object_name(resource_associated_entity_id) FROM
ys.dm_tran_locks WHERE request_session_id = @@spid and resource_type = 'OBJECT'", conn);
TName = cmd.ExecuteScalar().ToString();
//Retrieve the UserName of the current Database User
SqlCommand curUserCommand = new SqlCommand("SELECT system_user", conn);
User = curUserCommand.ExecuteScalar().ToString();
//Adapted the following command from a T-SQL audit trigger by Nigel Rivett
//http://www.nigelrivett.net/AuditTrailTrigger.html
SqlDataAdapter PKTableAdapter = new SqlDataAdapter(@"SELECT c.COLUMN_NAME
from INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk ,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE c
where pk.TABLE_NAME = '" + TName + @"'
and CONSTRAINT_TYPE = 'PRIMARY KEY'
and c.TABLE_NAME = pk.TABLE_NAME
and c.CONSTRAINT_NAME = pk.CONSTRAINT_NAME", conn);
DataTable PKTable = new DataTable();
PKTableAdapter.Fill(PKTable);

switch (tcontext.TriggerAction)//Switch on the Action occuring on the Table
{
case TriggerAction.Update:
iRow = inserted.Rows[0];//Get the inserted values in row form
dRow = deleted.Rows[0];//Get the overwritten values in row form
PKString = PKStringBuilder(PKTable, iRow);//the the Primary Keys and There values as a string
foreach (DataColumn column in inserted.Columns)//Walk through all possible Table Columns
{
if (!iRow[column.Ordinal].Equals(dRow[column.Ordinal]))//If value changed
{
//Build an Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "U";//U for Update
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = dRow[column.Ordinal].ToString();
aRow["NewValue"] = iRow[column.Ordinal].ToString();
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the entry
}
}
break;
case TriggerAction.Insert:
iRow = inserted.Rows[0];
PKString = PKStringBuilder(PKTable, iRow);
foreach (DataColumn column in inserted.Columns)
{
//Build an Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "I";//I for Insert
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = null;
aRow["NewValue"] = iRow[column.Ordinal].ToString();
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the Entry
}
break;
case TriggerAction.Delete:
dRow = deleted.Rows[0];
PKString = PKStringBuilder(PKTable, dRow);
foreach (DataColumn column in inserted.Columns)
{
//Build and Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "D";//D for Delete
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = dRow[column.Ordinal].ToString();
aRow["NewValue"] = null;
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the Entry
}
break;
default:
//Do Nothing
break;
}
AuditAdapter.Update(AuditTable);//Write all Audit Entries back to AuditTable
conn.Close(); //Close the Connection
}
}


//Helper function that takes a Table of the Primary Key Column Names and the modified rows Values
//and builds a string of the form "<PKColumn1Name=Value1>,PKColumn2Name=Value2>,......"
public static string PKStringBuilder(DataTable primaryKeysTable, DataRow valuesDataRow)
{
string temp = String.Empty;
foreach (DataRow kColumn in primaryKeysTable.Rows)//for all Primary Keys of the Table that is being changed
{
temp = String.Concat(temp, String.Concat("<", kColumn[0].ToString(), "=", valuesDataRow[kColumn[0].ToString)].ToString(), ">,"));
}
return temp;
}
}

The trick was getting the Table Name and the Primary Key Columns.
I hope this code is found useful.

Comments and Suggestion will be much appreciated.

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Oct 30, 2007

Table 1





First_Name

Middle_Name

Surname


John

Ian

Lennon


Mike

Buffalo

Tyson


Tom

Finney

Jones

Table 2




ID

F

M

S

DOB


1

Athony

Harold

Wilson

24/4/67


2

Margaret

Betty

Thathcer

1/1/1808


3

John

Ian

Lennon

2/2/1979


4

Mike

Buffalo

Tyson

3/4/04


5

Tom

Finney

Jones

1/1/2000


I want to be able to create a trigger that updates table 2 when a row is inserted into table 1. However I€™m not sure how to increment the ID in table 2 or to update only the row that has been inserted.

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Trigger - Require Help For Updating A Trigger Following An INSERT On Another Table

Feb 5, 2008

A





ID

Name


1

Joe


2

Fred


3

Ian


4

Bill


B





ID


1


4

I want to be able to create a trigger so that when a row is inserted into table A by a specific user then the ID will appear in table B. Is it possible to find out the login id of the user inserting a row?

I believe the trigger should look something like this:

create trigger test_trigger
on a
for insert
as
insert into b(ID)

select i.id
from inserted i
where
--specific USER

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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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Jul 20, 2005

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May 30, 2008

Hi,
I am not sure if this is the right forum to post this question.
I run an update statement like "Update mytable set status='S' " on the SQL 2005 management Studio.
When I run "select * from mytable" for a few seconds all status = "S". After a few seconds all status turn to "H".
This is a behaviour when you have an update trigger for the table. But I don't see any triggers under this table.
What else would cause the database automatically change my update?
Could there be any other place I should look for an update trigger on this table?
Thanks,

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Sep 20, 2007



Hi all in .net I've created an application that allows creation of triggers, i also want to allow the deletion of triggers.
The trigger name is kept in a table, and apon deleting the record i want to use the field name to delete the trigger

I have the following Trigger

the error is at

DROP TRIGGER @DeleteTrigger

I'm guessing it dosen't like the trigger name being a variable instead of a static name
how do i get around this?

thanks in advance

-- ================================================

-- Template generated from Template Explorer using:

-- Create Trigger (New Menu).SQL

--

-- Use the Specify Values for Template Parameters

-- command (Ctrl-Shift-M) to fill in the parameter

-- values below.

--

-- See additional Create Trigger templates for more

-- examples of different Trigger statements.

--

-- This block of comments will not be included in

-- the definition of the function.

-- ================================================

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

-- =============================================

-- Author: <Author,,Name>

-- Create date: <Create Date,,>

-- Description: <Description,,>

-- =============================================

CREATE TRIGGER RemoveTriggers

ON tblTriggers

AFTER DELETE

AS

BEGIN

-- SET NOCOUNT ON added to prevent extra result sets from

-- interfering with SELECT statements.

SET NOCOUNT ON;

Declare @DeleteTrigger as nvarchar(max)

select @DeleteTrigger = TableName FROM DELETED



IF OBJECT_ID (@DeleteTrigger,'TR') IS NOT NULL

DROP TRIGGER @DeleteTrigger

GO

END

GO

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