select
  inst_id,                                 -- INST_ID NUMBER
  session_id,                              -- SESSION_ID NUMBER
  function_id,                             -- FUNCTION_ID NUMBER
  description,                             -- DESCRIPTION VARCHAR2(64)
  decode(                                  -- TYPE VARCHAR2(15)
    type, 0, 'MISSING_LOGFILE', 1, 'ERROR', 2, 'OBJECT_FILTER', 3, 'CHGVEC_READ', 4, 'COMPLETE_LCR', 5, 'TXN_COMMIT', 6, 'PROCESS_STATE', 'UNKNOWN') 
from
  x$logmnr_callback