How do you prevent a recursive trigger in SQL Server?
Only direct recursion is prevented when the server trigger recursion option is set to 0 (OFF). (To disable indirect recursion, set the nested triggers option to 0.)
What is Pg_trigger_depth?
Be aware that pg_trigger_depth() counts any trigger, not only the same trigger to prevent recursion, so the condition prevents the trigger from firing if called from any other trigger, too. current nesting level of PostgreSQL triggers (0 if not called, directly or indirectly, from inside a trigger)
Can a trigger trigger itself?
Trigger Self-Recursion By default, a trigger does not call itself recursively. If an update trigger on one column of a table results in an update to another column, the update trigger fires only once. However, you can turn on the self_recursion option of the set command to allow triggers to call themselves recursively.
Are SQL triggers recursive?
Triggers are said to be recursive/nested when a trigger on a table calls another trigger on same or different table and so on. …
How can trigger recursion be prevented?
How to avoid Recursive Trigger: To avoid recursive triggers you can create a class with a static Boolean variable with default value true. In the trigger, before executing your code keep a check that the variable is true or not. Once you check make the variable false.
How do I debug a trigger in postgresql?
sql against the database you’re debugging, restart pgAdmin3, right-click your trigger function, hit ‘Set Breakpoint’, and then execute a statement that would cause the trigger to fire, such as the UPDATE statement above.
Can trigger return a value?
Trigger functions invoked by per-row triggers can return a table row (a value of type HeapTuple) to the calling executor, if they choose. A row-level trigger fired before an operation has the following choices: It can return NULL to skip the operation for the current row.
What are recursive triggers?
A recursive trigger is one that performs an action, such as an update or insert, which invokes itself owing to, say something like an update it performs. Recursion is the process of executing the same task multiple times. There may be chances to hit the Governor Limit with Recursive Trigger.