Implicit and explicit null values  set commands in triggers

Chapter 19: Triggers: Enforcing Referential Integrity

Triggers and performance

In terms of performance, trigger overhead is usually very low. The time involved in running a trigger is spent mostly in referencing other tables, which may be either in memory or on the database device.

The deleted and inserted trigger test tables are always in active memory. The location of other tables referenced by the trigger determines the amount of time the operation takes.

For more information on how triggers affect performance, see the Performance and Tuning Guide.





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