V$LOGSTDBY is deprecated.

Column Datatype Description
SERIAL# NUMBER SQL Session serial number. This data is used when joining this view with the V$SESSION and V$PX_SESSION views.
LOGSTDBY_ID NUMBER Parallel query slave ID
PID VARCHAR2(12) Process ID of the SQL apply process
TYPE VARCHAR2(30) Indicates the task being performed by the process (COORDINATOR, APPLIER, ANALYZER, READER, PREPARER, or BUILDER)
STATUS_CODE NUMBER Status number (or Oracle error code) belonging to the STATUS message
STATUS VARCHAR2(256) Description of the current activity of the process
HIGH_SCN NUMBER Highest system change number (SCN) seen by the process. This column is used to confirm the progress of the individual process.