Oracle database is quiesced when recreating Oracle Enterprise Manager (OEM) using Enterprise Manager Configuration Agent (EMCA) and can not be connected to database but sys user.
In the alert log file:
.......
Database in quiesce mode
SQL> select status,active_state from v$instance;
STATUS ACTIVE_ST
------------ ---------
OPEN QUIESCED
Database has to be unquiesced to allow users connect to.
SQL> alter system unquiesce;
SQL> select status,active_state from v$instance;
STATUS ACTIVE_ST
------------ ---------
OPEN NORMAL
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