Choose your database:
MS SQL Server
SQL Anywhere

Subscribe to our news:
Armin Braunstein: "Also I must say, that your PostgreSQL Maestro tool is the best tool for PostgreSQL I have seen. For general I am really happy about the tool and how it works".
Simon Pills: "Someone finally invented an intuitively used and easily customized PostgreSQL database administration tool! Keep up the good work. I will be in touch. I am able to do this horrendous work because your software enabled me to create a new database with all necessary objects in several minutes! I am sure that I have found what I really need".


Add your opinion

PostgreSQL Maestro online Help

Prev Return to chapter overview Next

Types of dependencies

This topic contains short descriptions for each type of database object dependencies.



A normal relationship between separately created objects. The dependent object may be dropped without affecting the referenced object. The referenced object may only be dropped by specifying CASCADE, in this case the dependent object is dropped as well. Example: a table column has a normal dependency on its data type.



The dependent object can be dropped separately from the referenced object, and should be automatically dropped (regardless of RESTRICT or CASCADE mode) if the referenced object is dropped. Example: a named constraint on a table is made auto dependent on the table, so that it will go away if the table is dropped.



The dependent object has been created as a part of creation of the referenced object, and is really just a part of its internal implementation. A DROP of the dependent object will be disallowed outright (we'll tell the user to issue a DROP against the referenced object instead). A DROP of the referenced object will be propagated through to drop the dependent object whether CASCADE is specified or not. Example: a trigger that's created to enforce a foreign-key constraint is made internally dependent on the constraint's pg_constraint entry.



There is no dependent object; this type of entry is a signal that the system itself depends on the referenced object, so that the object must never be deleted. Entries of this type are created only by initdb. The columns for the dependent object contain zeroes.



Prev Return to chapter overview Next