Index Access Method: Catalog Entries for Indexes
55.1. Catalog Entries for Indexes
Each index access method is described by a row in the pg_am
system catalog (see Section 48.3). The principal contents of a pg_am
row are references to pg_proc
entries that identify the index access functions supplied by the access method. The APIs for these functions are defined later in this chapter. In addition, the pg_am
row specifies a few fixed properties of the access method, such as whether it can support multicolumn indexes. There is not currently any special support for creating or deleting pg_am
entries; anyone able to write a new access method is expected to be competent to insert an appropriate row for themselves.
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