OS group	DB System Privilege	Authorized Operations	Where Referenced
oinstall	none	OS privileges to install and upgrade binaries	inst_group variable in oraInst.loc file; also defined by UNIX_GROUP_NAME variable in response file
dba	sysdba	All database privileges: start up,shut down, alter database, create and drop database, toggle archivelog mode, back up, and recover database	DBA_GROUP variable in response file or when prompted by OUI graphical installer
oper	sysoper	Start up, shut down, alter database, toggle archivelog mode, back up, and recover database	OPER_GROUP variable in response file or when prompted by OUI graphical installer
asmdba	sysdba for asm	Administrative privileges to Oracle automatic storage management (ASM) instances	n/a
asmoper	sysoper for asm	Starting up and stopping the Oracle ASM instance	n/a
asmadmin	sysasm	Mounting and dismounting of disk groups and other storage administration	n/a
backupdba	sysbackup	New in 12c; privilege allowing user to start up, shut down, and perform all backup and recovery operations	BACKUPDBA_GROUP in response file or when prompted by OUI graphical installer
dgdba	sysdg	New in 12c; associated with privileges related to managing Data Guard environments	DGDBA_GROUP variable in response file or when prompted by OUI graphical installer
kmdba	syskm	New in 12c; associated with privileges related to encryption management	KMDBA_GROUP variable in response file or when prompted by OUI graphical installer

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OS Group