Procedural code automatically executed in response to a database event.

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19
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1answer
2k 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
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 ...
11
votes
1answer
4k 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. ...
10
votes
2answers
3k 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 ...
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
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 ...
9
votes
4answers
12k 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 ...
8
votes
4answers
320 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
3k 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 ...
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
1k 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
598 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
1answer
9k 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 ...
7
votes
1answer
434 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 ...
7
votes
2answers
4k 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 ...
6
votes
3answers
4k 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 ...
6
votes
2answers
2k 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
681 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 ...
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
439 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
4answers
21k 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 -- ...
5
votes
4answers
865 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
5k 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
1answer
499 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
2answers
392 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
723 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
1answer
183 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

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
2answers
834 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
5k 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
2answers
518 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
220 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
236 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
1answer
278 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 ...
5
votes
2answers
749 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 ...
4
votes
3answers
4k 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 ...
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
1answer
113 views

How to determine if insert or update

Whenever INSERT is happened in the CUSTOMER table,I need to call the "StoredProcedure1"and UPDATE is happend in the CUSTOMER table,I need to call the "StoredProcedure2" in the Trigger. How to ...
4
votes
1answer
196 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 ...
4
votes
1answer
268 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 ...
4
votes
2answers
2k 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 ...
4
votes
2answers
1k 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
2k views

Trigger in MySQL

Please help me for few question in SQL.. I want to create the trigger which prevents insertion in the reservation table of flights (numflights), which does not exist. Tables ...
4
votes
1answer
607 views

Subquery returned more than 1 value

In my database I have two tables: projects and comp_types. When a new project is created a trigger is hit which inserts a concatenated value in a column in the projects table. A fully working SQL ...
4
votes
2answers
218 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

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
750 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 ...
4
votes
1answer
21k views

How to create a trigger that update the date field and time field upon modify of the row?

I have created a table testtable inside the database testbase that have the following structure: product_no (int, not null) product_name (varchar(30), not null) price (money, null) expire_date (date, ...
4
votes
2answers
2k views

Deadlock on insert for a table with an insert trigger that updates column in same triggered table

By specification each table uses a guid as the primary key. Another requirement is that each resource requires a 6 number identifier (100001, 100002, ...) as a public id that is unique within the ...
4
votes
1answer
244 views

Stored procedure deadlocking itself

I have a strange situation, seen from the log: Process 37278 waits for ExclusiveLock on advisory lock [16421,999999,12864385,2]; blocked by process 53807. Process 53807 waits for ExclusiveLock on ...