pg_tablespace stores information about the available tablespaces. Tables can be placed in particular tablespaces to aid administration of disk layout.
Unlike most system catalogs,
pg_tablespace is shared across all databases of a cluster: there is only one copy of
pg_tablespace per cluster, not one per database.
Owner of the tablespace, usually the user who created it
Access privileges; see Section 5.7 for details
Tablespace-level options, as “keyword=value” strings
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