Oracle Message PGA-21209 - error selecting PGA_2PC_PENDING rows for partner LU string

ERRORerror selecting PGA_2PC_PENDING rows for partner LU string
CAUSEThe RRM was unable to read the pending transaction entries from its LU6.2 log for the partner LU . An Oracle server message will follow this message, and contains information on the Oracle error.
ACTIONEnsure that the Oracle server and its TNS listener are both operational. Also ensure that the PGA_2PC_PENDING table exists and has not been altered or updated manually. If the table has been tampered with, it may need to be reinitialized and the RRM cold started.