In this recipe, we will explain how to enable an installed module so that it can be used in a particular database. The additional types, functions, and so on will exist only in those databases where we have carried out this step.
Note
Although most modules require this procedure, there are actually a couple of notable exceptions. For instance, the auto_explain
module mentioned earlier, which is shipped together with PostgreSQL, does not create any function, type or operator. To use it, you must load its object file using the LOAD
command. From that moment, all statements longer than a configurable threshold will be logged together with their execution plan. In the rest of this recipe, we will cover all the other modules. They do not require a LOAD
statement because PostgreSQL can automatically load the relevant libraries when they are required.
This recipe describes a procedure that has been greatly simplified in version 9.1 of PostgreSQL with the introduction of the...