CREATE ACCESS METHOD — define a new access method
CREATE ACCESS METHODname
TYPEaccess_method_type
HANDLERhandler_function
CREATE ACCESS METHOD
creates a new access method.
The access method name must be unique within the database.
Only superusers can define new access methods.
name
The name of the access method to be created.
access_method_type
This clause specifies the type of access method to define.
Only TABLE
and INDEX
are supported at present.
handler_function
handler_function
is the
name (possibly schema-qualified) of a previously registered function
that represents the access method. The handler function must be
declared to take a single argument of type internal
,
and its return type depends on the type of access method;
for TABLE
access methods, it must
be table_am_handler
and for INDEX
access methods, it must be index_am_handler
.
The C-level API that the handler function must implement varies
depending on the type of access method. The table access method API
is described in Chapter 63 and the index access method
API is described in Chapter 64.
Create an index access method heptree
with
handler function heptree_handler
:
CREATE ACCESS METHOD heptree TYPE INDEX HANDLER heptree_handler;
CREATE ACCESS METHOD
is a
PostgreSQL extension.