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If you are thinking of using dietlibc in your projects, one thing that you need to be aware of is that dietlibc is GPL (i.e., released under the GNU General Public License), not LGPL (i.e., released under the GNU Lesser Public License). I am not a lawyer (thank goodness!), but in a nutshell, this means that code that links with dietlibc is also GPL. Glibc is LGPL so that it can be used by proprietary code without that code becoming GPL. This is not the case with dietlibc. For more information about licensing and dietlibc, contact the dietlibc folks on their site, http://www.fefe.de/dietlibc/.

11/17/05

This recipe used the sp_configure system stored procedure to change the nested trigger behavior at the server level. To disable nesting altogether, sp_configure was executed for the nested trigger server option, followed by the parameter 0, which disables nesting: EXEC sp_configure 'nested triggers', 0 RECONFIGURE WITH OVERRIDE GO Because server options contain both a current configuration versus an actual runtime configuration value, the RECONFIGURE WITH OVERRIDE command was used to update the runtime value so that it takes effect right away. In order to enable nesting again, this server option is set back to 1 in the second batch of the recipe.

For more information about dietlibc, there is an enlightening and entertaining presentation by its author at http://www.fefe.de/dietlibc/talk.pdf. It is a talk that was originally presented in 2001 at the Linux-Kongress in Germany. It is well worth a read if not just for its amusing observations regarding Glibc, BSD, and Linux licensing and coding philosophy.

Trigger nesting is considered to be recursive if the action performed when a trigger fires causes the same table trigger to fire again. Recursion can also occur when a trigger s fire impacts a different table, which also has a trigger that impacts the original table, thus causing the trigger to fire again. You can control whether recursion is allowed by configuring the RECURSIVE_TRIGGERS database option. If you allow recursion, your AFTER triggers will still be impacted by the 32-level nesting limit, preventing an infinite looping situation. This example demonstrates enabling and disabling this option: -- Allows recursion ALTER DATABASE AdventureWorks SET RECURSIVE_TRIGGERS ON -- View the db setting SELECT is_recursive_triggers_on FROM sys.databases WHERE name = 'AdventureWorks' -- Prevents recursion ALTER DATABASE AdventureWorks SET RECURSIVE_TRIGGERS OFF -- View the db setting SELECT is_recursive_triggers_on FROM sys.databases WHERE name = 'AdventureWorks' This returns: is_recursive_triggers_on -----------------------1 is_recursive_triggers_on -----------------------0

ALTER DATABASE was used to configure database-level options, including whether or not triggers were allowed to fire recursively within the database. The option was enabled by setting RECURSIVE_TRIGGERS ON: ALTER DATABASE AdventureWorks SET RECURSIVE_TRIGGERS ON The option was then queried by using the sys.databases system catalog view, which showed the current database option in the is_recursive_triggers_on field (1 for on, 0 for off): SELECT is_recursive_triggers_on FROM sys.databases WHERE name = 'AdventureWorks' The recipe then disabled trigger recursion by setting the option OFF, and then confirming it again in a sys.databases query.

The easiest way to get the latest dietlibc is to retrieve it from its online source code repository, which is stored in CVS, a popular source code control system. To retrieve dietlibc, create a working directory to hold its source code and your notes, and then issue the following command: $ cvs -d :pserver:cvs@cvs.fefe.de:/cvs -z9 co dietlibc This creates the directory dietlibc on your system and populates it from the source code archive on the dietlibc CVS server. Depending on the speed of your Internet connection, retrieving the source code may take a few minutes.

In general you should try to encapsulate triggers that react to the same events within a single trigger. This improves manageability and supportability of the triggers, because you ll have an easier time finding the code you are looking for, and be able to troubleshoot accordingly. You ll also avoid the issue of trying to figure out which trigger ran first. Instead, you can define multiple triggers on the same table, referencing the same DML types (for example multiple INSERT triggers). DDL triggers can also be set on the same database or server scope events or event groups. If you find that you must have separate triggers referencing the same database objects (perhaps you ve added triggers so as not to overlap a third party s code), and if the order in which they are fired is important to you, you should configure it using the sp_settriggerorder system stored procedure. The syntax for sp_settriggerorder is as follows: sp_settriggerorder [ @triggername = ] '[ triggerschema. ] triggername' , [ @order = ] 'value' , [ @stmttype = ] 'statement_type' [ , [ @namespace = ] { 'DATABASE' | 'SERVER' } ] Table 12-6 details the arguments of this command. Table 12-6. sp_settriggerorder Arguments