# 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                |