pg_compression

The pg_compression system catalog table describes the compression methods available.

Table 1. pg_catalog.pg_compression

column	type	modifers	storage	description
compname	name	not null	plain	Name of the compression
compconstructor	regproc	not null	plain	Name of compression constructor
compdestructor	regproc	not null	plain	Name of compression destructor
compcompressor	regproc	not null	plain	Name of the compressor
compdecompressor	regproc	not null	plain	Name of the decompressor
compvalidator	regproc	not null	plain	Name of the compression validator
compowner	oid	not null	plain	oid from pg_authid