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.
||Row identifier (hidden attribute; must be explicitly selected)|
||Name of the access method|
||OID of a handler function that is responsible for supplying information about the access method|
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,
related functions have been added to allow SQL queries to inspect
index access method properties; see Table 9.63.
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