The gp_fastsequence table contains information about append-optimized and column-oriented tables. The last_sequence value indicates maximum row number currently used by the table.

    column type references description
    objid oid pgclass.oid Object id of the pg_aoseg.pg_aocsseg* table used to track append-optimized file segments.
    objmod bigint Object modifier.
    last_sequence bigint The last sequence number used by the object.

    Parent topic: System Catalogs Definitions