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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 |
