The system provides two features to improve the integrity and consistency
of your data.
- Referential constraints let you put controls (constraints) on data in
files you define as having a mutual dependency. A referential
constraint lets you specify rules to be followed when changes are made to
files with constraints. Constraints are described in detail in Ensuring data integrity with referential constraints.
- Triggers let you run your own program to take any action or evaluate
changes when files are changed. When predefined changes are made or
attempted, a trigger program is run. Triggers are described in detail
in Triggering automatic events in your database.
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