You must start the ARCHIVELOG MODE to backup the database after installing the agent.
To start ARCHIVELOG mode
At the SQL*Plus prompt in Oracle:
CONNECT SYS/SYS_PASSWORD AS SYSDBA STARTUP MOUNT EXCLUSIVE ALTER DATABASE ARCHIVELOG; ALTER DATABASE OPEN; ARCHIVE LOG START;
If you are not using a flash recovery area with your Oracle 10g or Oracle 11g server, you must include the following entries in either the PFILE or the SPFILE:
LOG_ARCHIVE_DEST_1="C:\Oracle\oradata\ORCL\archive" LOG_ARCHIVE_FORMAT="ARC%S_%R.%T"
Note: With Oracle 10g or Oracle 11g, the LOG_ARCHIVE_START and LOG_ARCHIVE_DEST entries are considered obsolete and should not be made, in either the PFILE or the SPFILE.
For more information about the Archive Log Mode, see the Oracle documentation.
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