pg_control_checkpoint(OUT checkpoint_lsn pg_lsn, OUT redo_lsn pg_lsn, OUT redo_wal_file text, OUT timeline_id integer, OUT prev_timeline_id integer, OUT full_page_writes boolean, OUT next_xid text, OUT next_oid oid, OUT next_multixact_id xid, OUT next_multi_offset xid, OUT oldest_xid xid, OUT oldest_xid_dbid oid, OUT oldest_active_xid xid, OUT oldest_multi_xid xid, OUT oldest_multi_dbid oid, OUT oldest_commit_ts_xid xid, OUT newest_commit_ts_xid xid, OUT checkpoint_time timestamp with time zone)