Correct Answers:
A and C
A - Correct -> to startup the enterprise manager database express, the database have to be in open state
B - Incorrect -> to perform a full recovery, the database has to be in mount state, and EM express not work if database is not in open state
C - Correct -> since they are in different hosts, you can use the same port for then (default 5500)
D - Incorrect -> to switch a database to ARCHIVELOGMODE the database need to be in mount state (like B answer)
E - Incorrect -> the same port cannot be used in the same time for different services in the same host (here a basic of tcp/ip protocol)
If need more reference:
EM Express (Chapter 3.3)
https://docs.oracle.com/en/database/oracle/oracle-database/19/admqs/2-day-dba.pdf
ARCHIVELOGMODE (Chapter 12.3.2)
https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/database-administrators-guide.pdf
A, B are correct!
EM Express is available only when the database is open. This means that EM Express cannot be used to start up the database. Other operations that require that the database change state, such as enable or disable ARCHIVELOG mode, are also not available in EM Express.
E is wrong…
Use the PL/SQL procedure DBMS_XDB_CONFIG.SETHTTPSPORT to set the HTTPS port for EM Express for the database to a port that is not in use. This will update the HTTPS port in the xdbconfig.xml file in the Oracle XML DB Repository. You must connect as SYS / AS SYSDBA to run the procedure.
so you Need to use a port that is not in use
OEM Database Express is designed to manage only one database, and is intended for
database administrators. When you invoke Database Express, you will be prompted for a
username and password to connect to the database. You should provide a user account that
has administrative privileges.
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