Procedural code automatically executed in response to a database event.
17
votes
1answer
1k views
Is there a good way to run a trigger for each record in a postgres table?
I have a system where I can't control the design of some tables (replicated via Slony-I), and so I have a series of what we refer to as 'shadow tables', where I extract some information out of the ...
12
votes
3answers
805 views
Slow deletion of records when a trigger is enabled
Thought this was solved with the link below - the work around works - but the patch doesn't. Working with Microsoft support to resolve.
http://support.microsoft.com/kb/2606883
Ok so I have an ...
9
votes
3answers
998 views
How to change the firing order of Triggers?
Realy I rarely use triggers. So I met a problem at first time. I have a lot of tables with triggers (2 or more for every table). I would like to know and change the order of firing triggers for every ...
7
votes
3answers
2k views
Wise to use trigger to update another table?
I have an Object table which is populated from an Integrated service (which I can change if needed) from another database. At certain points we need to manually add posts in another table ...
7
votes
1answer
624 views
Why am I NOT getting a mutating table error in trigger?
It's (or at least was) known that you cannot use DML statements on a mutating table inside a trigger. An excerpt from the Oracle documentation:
A mutating table is a table that is being modified ...
7
votes
3answers
4k views
How to detect any changes to a database (DDL and DML)
There are a lot of databases on my client's sql server. In common, these databases is under development, so developers can design, refactor, do data modifications and so on. There are some databases ...
7
votes
1answer
315 views
How can I rewrite for SQL Server a trigger that writing for Oracle?
How can I rewrite for SQL Server a trigger that was originally written for Oracle ?
Here is my Oracle trigger code:
CREATE OR REPLACE TRIGGER P000KUL_TEST
BEFORE
INSERT
ON P000KUL
REFERENCING NEW AS ...
6
votes
2answers
2k views
Trigger: move deleted rows to archive table
I have a small (~10 rows) table called restrictions in my PostgreSQL database, where values are deleted and inserted on a daily basis.
I would like to have a table called restrictions_deleted, where ...
6
votes
3answers
850 views
How to log data changes in Access at the table level?
I support an Access database for a non-profit organization. We have some issues with data mysteriously changing, and there been some, um, friendly debate over whether this is caused by users who are ...
6
votes
2answers
2k views
Performance of a Trigger vs Stored Procedure in MySQL
A post here on DBA.StackExchange (What are the best practices for triggers to maintain a revision number on records?) has spawned an interesting question (at least, interesting to me) regarding ...
5
votes
3answers
720 views
Alternatives to an INSERT Trigger
Looking for an example code in Oracle to do the same. i.e.
Remove an insert trigger on table T1 whose job is to create a row in T2 based on the derived data. How would this PL-SQL api look like?
...
5
votes
1answer
313 views
If an 'after' DDL trigger causes an error, is the DDL rolled back?
It has been suggested that DDL is logically performed something like this:
begin
COMMIT;
perform any appropriate pre-DDL trigger code;
do the ddl;
perform any appropriate post-DDL ...
5
votes
1answer
516 views
Should I add SET NOCOUNT ON to all my triggers?
It is fairly common knowledge that you should have
SET NOCOUNT ON
by default when creating new stored procedures.
Microsoft has changed the default template to include this in 2012. I thought ...
5
votes
1answer
2k views
Trigger to UPDATE after UPDATE?
I want to make a trigger to record the time of any update as
CREATE TRIGGER col_update
AFTER UPDATE ON col
FOR EACH ROW BEGIN
UPDATE col SET updated=NOW() WHERE id=NEW.id; // or OLD.id
END
The ...
5
votes
1answer
142 views
In a Trigger, can I determine if a column was explicitly set to a values or not mentioned in update statement?
Given a Table with a column col1 like this:
create table MyTest (
col1 int NULL,
col2 decimal(7, 2) NULL
);
insert into MyTest values ( 1, 1.1);
Is there a way for a trigger for update to ...
5
votes
2answers
280 views
considerations when using triggers on a replicated (target) database
Our SQL Sever 2008 application database is replicated from Server A to Server B (push replication). We use the copy, let's call it database_b, on Server B to create reports and run other queries so ...
5
votes
1answer
159 views
Triggers and the Transaction
We recently made a change to create constraints based on logic previously used in stored procedures, and part of that included the use of INSTEAD OF triggers to centralize logic.
The logic is ...
4
votes
7answers
321 views
Policies RE database triggers in well-designed applications?
I've heard all kinds of horror stories around gremlins living in database triggers, and--worse--systems being brought down by the addition of a trigger that caused a chain of cascading ones.
I'm ...
4
votes
3answers
535 views
Making a column immutable in MySQL
I want to make a column in a relation unmodifyable for consistency reasons.
The backstory is that I have a n:n relationship where the "connecting" relation has additional values. I don't want that ...
4
votes
3answers
934 views
Restrict update on certain columns. Only allow stored procedure to update those columns
I have sensitive price columns that I would like to have updated only through a stored procedure. I would like all code or manual attempts to alter values in these price columns to fail if it is not ...
4
votes
1answer
871 views
Why doesn't INSERT AFTER Trigger add all results?
I'm working on the exercises for db-class.org where we have to write a trigger that makes new students named 'Friendly' automatically like everyone else in their grade. That is, after the trigger ...
4
votes
2answers
625 views
Is there a way to ensure that a SQL Server trigger will be executed?
My supervisor is hesitant to use a trigger in a process because if there is a network interruption at just the right time, the process would not complete. Does SQL Server include the trigger in the ...
4
votes
2answers
372 views
Implementing a Circular Buffer (Sliding window) in MySQL
I intend to store some Java objects in a MySQL database, accompanied by a timestamp. These objects should be kept in a Sliding Window fashion (also known as Circular Buffer), meaning that only the ...
4
votes
2answers
151 views
Can I be notified of a rollback in my DDL Trigger?
I'd like DDL changes in SQL Server to trigger an external process (outside of SQL). The problem is, is there a way for me to be notified via my trigger that a rollback occurred?
For instance, with ...
4
votes
2answers
2k views
Database logon trigger
To block a particular user and IP combination on an Oracle Database , I created the following trigger, and compiled without errors.
Create or replace trigger you_may_not_login
after logon on database
...
4
votes
1answer
895 views
Can a trigger access the query string?
I'm thinking about using triggers as a logging mechanism in MySQL (v. 5.1) and therefore I'd like my trigger to get the query string in order to store it in another tabe.
I couldn't find anything ...
4
votes
1answer
775 views
Is it possible to get execution call stack in a trigger?
I have 10 stored procedures and each of them does INSERTs into one tableX.
Is it possible in a trigger body of tableX to get what object causes modification of tableX (stored proc1 or sp2 or....) ?
...
4
votes
1answer
158 views
How can I know which store procedure or trigger is using a table on SQL Server 2008 R2?
This is the case that in the DB I'm checking, there is an archive table which keeps the user history, and there is a trigger or store procedure that after some time delete rows from this table, in ...
4
votes
1answer
136 views
Prevent users deleting more than a certain number of rows in MySQL
The problem:
I have a table with rows, nothing special about it
When a database user removes a row, it should increment a number
A database user is only allowed to remove 3 rows max in the table
A ...
3
votes
1answer
180 views
Trigger in combination with transaction
Suppose we have the following situation:
We have a table (let's say Table_A), wich has a trigger on INSERT. The trigger job is to update some rows in table_B based on the inserted values in table_A.
...
