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Oracle database is quiesced when recreating OEM

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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