Administrative Accounts

CTXSYS	 		Oracle Text account
DBSNMP			Management Agent 
LBACSYS			Oracle Label Security
MDDATA			Oracle Spatial Geocoder
MDSYS			Oracle Spatial interMedia Locator
DMSYS			Data Mining
OLAPSYS			OLAP Catalog
ORDPLUGINS		Oracle interMedia
ORDSYS			Oracle interMedia
OUTLN			Stored Outlines
SI_INFORMTN_SCHEMA	SQL/MM Still Image Standard
SYS			Database Administration
SYSMAN			Oracle Enterprise Manager
SYSTEM			Database Administration

init.ora locations

UNIX and Linux - $ORACLE_HOME/dbs
Windows - %ORACLE_HOME%\database

1. spfile$ORACLE_SID.ora
2. spfile.ora
3. init$ORACLE_SID.ora