Procedural code automatically executed in response to a database event.

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19
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1answer
3k 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 ...
13
votes
1answer
8k 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. ...
13
votes
2answers
4k 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 ...
13
votes
3answers
2k 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 ...
10
votes
1answer
5k 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 ...
10
votes
5answers
17k 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 ...
9
votes
3answers
2k 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 ...
9
votes
2answers
107 views

How often will a FOR EACH STATEMENT trigger execute if the operation is caused by an FK constraint with UPDATE CASCADE?

I understand that a trigger on table t defined with FOR EACH STATEMENT will run once when I execute an UPDATE t .... Now, when t is defined with FOREIGN KEY ... REFERENCES a ... ON UPDATE CASCADE, ...
9
votes
1answer
2k 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 ...
8
votes
4answers
441 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 ...
8
votes
1answer
13k 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 ...
8
votes
2answers
5k 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 ...
7
votes
4answers
31k views

Call a stored procedure from a trigger

I have created a stored procedure in mysql using the following syntax. DROP PROCEDURE IF EXISTS `sp-set_comment_count`; DELIMITER $$ CREATE PROCEDURE `sp_set-comment_count` (IN _id INT) BEGIN -- ...
7
votes
3answers
7k 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 ...
7
votes
3answers
3k 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
3answers
2k 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 ...
7
votes
1answer
1k views

Synchronization using triggers

I have a requirement similar to previous discussions at: Writing a simple bank schema: How should I keep my balances in sync with their transaction history? Trigger in combination with transaction ...
7
votes
2answers
2k 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 ...
7
votes
1answer
501 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
7k views

How to get last identity row Inserted when using instead of trigger

When I insert into tables using instead of triggers, @@Identity, IDENT_CURRENT('Table') and SCOPE_IDENTITY() return null. How I can get the last identity of inserted row?
6
votes
2answers
3k 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....) ? ...
6
votes
1answer
940 views

Getting Identity values to use as FK in an INSTEAD OF trigger

I have a series of updateable views we are exposing to end users as the interface for a back end process. One of these views references two tables and requires an INSTEAD OF trigger for UPDATE and ...
6
votes
1answer
1k views

What are the privileges required to execute a trigger function in PostgreSQL 8.4?

What are the privileges required to execute a trigger function in PostgreSQL 8.4? It seems that the privileges set to a role does not matter to execute a trigger function. I think I have seen some ...
5
votes
3answers
1k 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
7answers
461 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 ...
5
votes
3answers
18k views

What are the causes and solutions for mutating table errors?

I understand mutating table errors are caused by a design flaw or problematic query. An old query was recently put into production which throws a mutating table error. Our DBA solved the problem but ...
5
votes
4answers
983 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 ...
5
votes
1answer
8k views

Why I don't need to COMMIT in database trigger?

We can't COMMIT/ROLLBACK in DML triggers because transaction is handled manually after DML statement. However, database triggers seems to be an exception. For example, suppose there's a database ...
5
votes
3answers
3k views

When was a table trigger disabled and re-enabled?

I need to know if the enable/disable history of a table trigger is natively tracked by SQL Server. I've reviewed the system views: • [sys].[triggers] contains a modify_date field • ...
5
votes
3answers
5k views

Disable trigger for just one table

Is it possible to disable a trigger momentarily but for just one table. For example I have table, TableA with an on insert, update and delete trigger. I also have a table B with the same triggers but ...
5
votes
3answers
3k views

Using MySQL triggers or transactions?

I want to ask your opinion in using MySQL triggers or transactions in a website. Actually I have a history payment table with - UserId | OperationId | Comment | Credits | Sign (debit or credit). So ...
5
votes
1answer
466 views

What is the correct way to ensure unique entries in a temporal database design?

I'm having trouble with the design of a temporal database. I need to know how to make sure I have only one active record for any given timeframe for a store. I have read this answer, but I'm afraid I ...
5
votes
1answer
566 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
794 views

How to access NEW or OLD field given only the field's name?

I'm writing a validation trigger. The trigger must validate that the sum of an array equals another field. Since I have many instances of this validation, I want to write a single procedure and create ...
5
votes
2answers
652 views

Optimize queries from MySQL SP/Triggers/Functions

I have to investigate a MySQL Production server,While investigating I found a DELETE query in "SHOW PROCESSLIST" which was taking more than 400 second in preparing state, I tried to find the query in ...
5
votes
1answer
1k views

Check what event called the trigger on PostgreSQL?

I'm trying to check what event called my trigger, like INSERT, UPDATE or DELETE. Oracle triggers can check this in a simple 'IF' statement: IF INSERTING, IF UPDATING or even IF DELETING Is there a ...
5
votes
2answers
3k views

Does a TRIGGER improve the performance?

I understand that TRIGGERs are useful, as they take care of subsequent queries, but do they have an advantage from performance point of view too? Replacing two or three queries as INSERT INTO table1 ...
5
votes
1answer
195 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
1k 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 ...
5
votes
2answers
7k 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 ...
5
votes
3answers
808 views

Deadlock Error from SQL Server 2000 to SQL Server 2008

After migrating data from SQL Server 2000 to SQL Server 2008, when I am doing any a transaction in the table which find out more row on the database, that's gives me error. Transaction (Process ...
5
votes
2answers
671 views

Error using triggers with SQL Server Profiler Tables

After noticing 100's of sort_warning errors in a recent analysis of the default trace output, I am trying get the text of the queries causing those warnings. SQL Server Profiler has an event ...
5
votes
1answer
253 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 ...
5
votes
1answer
292 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 ...
5
votes
2answers
855 views

Transaction independent writes inside a trigger

I am using sql express 2008 r2 express edition. Is it possible to do writes inside a trigger independent from the the transaction of the statement which causes the trigger to fire? I have triggers ...
5
votes
1answer
427 views

How to get output from trigger on linked server

Fair warning, I know this isn't the best way to do this, but I'm trying to extend some existing code without needing to do a rewrite. Anyway, I've got two SQL Server 2012 installs, one local in my ...
4
votes
2answers
453 views

How do I find the next saturday in MySQL

I have trigger and a stored procedure in it (so SP runs when trigger runs). I need a function which finds the next saturday to put in SP. So lets say, it is Wednesday (2015-7-22) today. If my ...
4
votes
1answer
2k views

MySQL possibility to create global routines (stored procedures and/or functions)

Is it possible to somehow define globally available routines? It seems like every routine must be created in a scope of the database. When I tried to create a routine from console (without prior ...
4
votes
1answer
2k 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
840 views

Insert RECORD into a table in a trigger function

I would like to insert a RECORD data type variable (NEW variable) into a table in a trigger. What would the SQL look like? The following attempts were unsuccessful: EXECUTE 'INSERT INTO my_table ...