CREATE ACCESS METHOD
CREATE ACCESS METHOD is a DDL command for defining an access method.
CREATE ACCESS METHOD was added in PostgreSQL 9.6.
Available access methods
As of PostgreSQL 12, both table and index access methods are supported.
In PostgreSQL 11 and earlier, only the index access method was available.
There is no
ALTER ACCESS METHOD command.
heptree" index access method noted in the documentation is fictitious.
CREATE ACCESS METHOD has not been modified since it was added in PostgreSQL 9.6.