On Fri, Aug 5, 2016 at 2:54 AM, Anastasia Lubennikova
<a.lubennikova@postgrespro.ru> wrote:
> They can be logically separated into three categories:
> "primary storage" - r, S, t, v. They store data and visibility information.
> The only implementation is heapam.c
> "secondary index" - i. They store some data and pointers to primary storage.
> Various existing AMs and managed by AM API.
> "virtual relations" - c, f, m. They have no physical storage, only entries
> in caches and catalogs.
Materialized views (relkind == "m") have physical storage, and may have indexes.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company