oracle 11g Log Miner hangs on first archived log

RDBMS

Oracle 11g (11.2.0.4)

O/S

RHEL 6

When I start a Log Miner (LM) session it seems to 'hang' on the first (of many) archived logs.

I see evidence of this in two places:

- lsof -p <pid of LM> | grep ARC  [run once per minute for over an hour and the output doesn't change; i.e., the .ARC file that is open by LM stays the same]

- alert.log shows ARC log being opened for read but hasn't moved on to the next ARC log

Here's essentially what I've done:

-- COMMANDS EXECUTED

EXECUTE DBMS_LOGMNR.START_LOGMNR(STARTTIME => '22-Jul-2019 00:00:00',ENDTIME => '22-Jul-2019 00:06:00',OPTIONS => DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG + DBMS_LOGMNR.CONTINUOUS_MINE + DBMS_LOGMNR.COMMITTED_DATA_ONLY);