How to enable archivelog mode #oracle #oracletutorial #archivlogs #oradba #oracledatabasetutorial

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* How to enable archivelog mode in Oracle *
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Running a Database in ARCHIVELOG Mode

When you run a database in ARCHIVELOG mode, you enable the archiving of the redo log. The database control file indicates that a group of filled redo log files cannot be reused by LGWR until the group is archived. A filled group becomes available for archiving immediately after a redo log switch occurs.

Steps: ---
Log in as user oracle and enter the following commands:
Open cmd in Windows.

$ export ORACLE_SID=orcl
(if your database is already orcl the no need to export.)
where orcl is the name of the database.

$ sqlplus /nolog
SQL⇒ connect / as sysdba

Check the ARCHIVELOG mode.
SQL⇒ archive log list;

So archivelog is Disabled here. lets flow the below command to enable archivelog mode.

To enable ARCHIVELOG mode status, enter the following SQL commands:

SQL⇒ Shutdown
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL⇒ startup mount
ORACLE instance started.

Total System Global Area 3390558208 bytes
Fixed Size 2180464 bytes
Variable Size 1996491408 bytes
Database Buffers 1375731712 bytes
Redo Buffers 16154624 bytes
Database mounted.

SQL⇒ Alter database archivelog;
Database altered.

SQL⇒ alter database open;

To check the ARCHIVELOG mode status, enter the following SQL command:
SQL⇒ archive log list;

Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 29
Next log sequence to archive 31
Current log sequence 31

So database arhivelog is enabled now.

Note : Flow the Process shown in video.

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Thanks & Regards,
Chitt Ranjan Mahto "Chirag"
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