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Oracle® Database 2 Day DBA
10g Release 2 (10.2)

Part Number B14196-02
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Overview of Users and Security

For users to access your database, you the database administrator must create user accounts and grant appropriate database access privileges to those accounts. A user account is identified by a username and defines the user's security attributes, including the following:

User accounts are usually created by a database administrator or a person specifically assigned to create accounts and administer security. After you create a user account, you must grant basic privileges to the account to enable the user to connect to the database and to view and create database objects, known as schema objects. The name of the schema is identical to the name of the user.

All databases include the SYS, SYSTEM, SYSMAN, and DBSNMP administrative accounts. Other accounts are included depending upon what features or options are installed.

The administrative accounts provided by Oracle Database should be used only by authorized individuals. To protect these accounts from unauthorized access, these accounts are initially locked with their passwords expired. As the database administrator, you are responsible for the unlocking and resetting of these accounts as described in "Unlocking Accounts and Resetting Passwords". Table 7-1 contains descriptions of some of these accounts.

Table 7-1 Administrative User Accounts Provided by Oracle Database

Username Password Description See Also

CTXSYS

CTXSYS

The Oracle Text account

Oracle Text Reference


DBSNMP

DBSNMP

The account used by the Management Agent component of Oracle Enterprise Manager to monitor and manage the database

Oracle Enterprise Manager Grid Control Installation and Basic Configuration


MDDATA

MDDATA

The schema used by Oracle Spatial for storing Geocoder and router data

Oracle Spatial User's Guide and Reference


MDSYS

MDSYS

The Oracle Spatial and Oracle interMedia Locator administrator account

Oracle Spatial User's Guide and Reference


DMSYS

DMSYS

The data mining account. DMSYS performs data mining operations.

Oracle Data Mining Administrator's Guide

Oracle Data Mining Concepts


OLAPSYS

MANAGER

The account used to create OLAP metadata structures. This account owns the OLAP Catalog (CWMLite).

Oracle OLAP Application Developer's Guide


ORDPLUGINS

ORDPLUGINS

The Oracle interMedia user. Plugins supplied by Oracle and third party format plugins are installed in this schema.

Oracle interMedia User's Guide


ORDSYS

ORDSYS

The Oracle interMedia administrator account

Oracle interMedia User's Guide


OUTLN

OUTLN

The account that supports plan stability. Plan stability enables you to maintain the same execution plans for the same SQL statements. OUTLN acts as a role to centrally manage metadata associated with stored outlines.

Oracle Database Performance Tuning Guide


SI_INFORMTN_SCHEMA

SI_INFORMTN_SCHEMA

The account that stores the information views for the SQL/MM Still Image Standard

Oracle interMedia User's Guide


SYS

CHANGE_ON_INSTALL

The account used to perform database administration tasks

"About Administrative Accounts"

SYSMAN

CHANGE_ON_INSTALL

The account used to perform Oracle Enterprise Manager database administration tasks. Note that SYS and SYSTEM can also perform these tasks.

Oracle Enterprise Manager Grid Control Installation and Basic Configuration


SYSTEM

MANAGER

Another account used to perform database administration tasks

"About Administrative Accounts"


Sample Schemas

Most of the included accounts are administrative accounts, but Sample Schema accounts are also present. The Oracle Database Sample Schemas are a set of interlinked schemas that enable Oracle documentation, and Oracle by Example Series, to illustrate common database tasks:

  • The human resources (hr) schema is useful for introducing basic topics. An extension to this schema supports Oracle Internet Directory demos.

  • The order entry (oe) schema is useful for dealing with matters of intermediate complexity. Many datatypes are available in this schema, including nonscalar datatypes.

  • The online catalog (oc) subschema is a collection of object-relational database objects built inside the oe schema.

  • The product media (pm) schema is dedicated to multimedia datatypes.

  • The information exchange (ix) schemas demonstrate Oracle Advanced Queuing capabilities.

  • The sales history (sh) schema is designed for demos with large amounts of data. An extension to this schema provides support for advanced analytic processing.

See Also:

Oracle Database Sample Schemas for a description of the Sample Schemas that are used for examples in Oracle Database documentation and educational materials.