Comming out from archivelog mode

Question

Hi,
I have a database which is in archive log mode. How can I come back to non archive log mode ?
Many thanks.

Answer 1

Setting log_archive_start = true in init.ora file enables automatic archiving of redo log files.
You will disable automatic archiving if you say.
SQL> ALTER SYSTEM ARCHIVE LOG STOP;
Now you have to archive the redo log manually. If the database is in archivelog mode and automatic archiving is disabled and if log switch happens then LGWR cannot overwrite the redo log file which is not yet archived. I experimented on my test machine and database operation hang up as follows.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production
SQL> alter system switch logfile;
System altered.
SQL> /
hanged here.
If you say the following then database will not be in archivelog mode. LGWR will overwrite the redolog files and will not wait for archiving as the database is in noarchivelog mode.
SQL> startup mount
SQL> alter database noarchivelog;
Now it depends upon your requirement. Do you want to stop the current archivelog mode temporarily or permanent ?
aijaz