52.3. pg_am
The catalog pg_am
stores information about relation access methods. There is one row for each access method supported by the system. Currently, only indexes have access methods. The requirements for index access methods are discussed in detail in Chapter 60.
Table 51.3. pg_am
Columns
Note
Before PostgreSQL 9.6, pg_am
contained many additional columns representing properties of index access methods. That data is now only directly visible at the C code level. However,pg_index_column_has_property()
and related functions have been added to allow SQL queries to inspect index access method properties; see Table 9.63.
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