CREATE ACCESS METHOD

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## CREATE ACCESS METHOD

CREATE ACCESS METHOD — define a new access method

## Synopsis

```
CREATE ACCESS METHOD name
    TYPE access_method_type
    HANDLER handler_function

```

## Description

`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.

## Parameters

*`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 61](tableam.html) and the index access method API is described in [Chapter 62](indexam.html).

## Examples

 Create an index access method `heptree` with handler function `heptree_handler`:

```
CREATE ACCESS METHOD heptree TYPE INDEX HANDLER heptree_handler;

```

## Compatibility

`CREATE ACCESS METHOD` is a PostgreSQL extension.

## See Also

[DROP ACCESS METHOD](sql-drop-access-method.html), [CREATE OPERATOR CLASS](sql-createopclass.html), [CREATE OPERATOR FAMILY](sql-createopfamily.html)

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