You’ve created a brand new instance or cloned Live into Staging; now you need to take it out of archivelog mode to boost performance.
create pfile from spfile;
then edit the pfile (.../dbs/initSID.ora) to include *.log_archive_start=FALSE, then take a backup, then continue with
shutdown immediate; create spfile from pfile; startup mount; alter database noarchivelog; alter database open;
then confirm the change with
archive log list; shutdown immediate;
You then need to take a backup because all previous backups are now invalid.
In 11g you can/should omit the editing of the s/pfile since that is deprecated; in 11g the archivelog mode is stored in the control file(s).