User Management

15Copyright © Oracle Corporation, 2001. All rights reserved.

Managing Users

15-2 Copyright © Oracle Corporation, 2001. All rights reserved.

Objectives

After completing this lesson, you should be able to do the following:• Create new database users• Alter and drop existing database users• Monitor information about existing users


Accountlocking

Tablespacequotas

Temporarytablespace

Defaulttablespace

Roleprivileges

Resourcelimits

Securitydomain

Directprivileges

Authenticationmechanism

Users and Security


Database Schema

Schema ObjectsTablesTriggersConstraintsIndexesViewsSequencesStored program unitsSynonymsUser-defined data typesDatabase links

• A schema is a named collection of objects.

• A user is created, and a corresponding schema is created.

• A user can be associated only with one schema.

• Username and schema are often used interchangeably.


Checklist for Creating Users

• Identify tablespaces in which the user needs to store objects.

• Decide on quotas for each tablespace.• Assign a default tablespace and temporary

tablespace.• Create a user.• Grant privileges and roles to the user.


Creating a New User: Database Authentication

Set the initial password:

CREATE USER aaronIDENTIFIED BY soccerDEFAULT TABLESPACE dataDEFAULT TEMPORARY TABLESPACE tempQUOTA 15M ON dataQUOTA 10M ON usersPASSWORD EXPIRE;


Creating a New User: Operating System Authentication

The OS_AUTHENT_PREFIX initialization parameter specifies the format of the usernames.Defaults to OPS$.CREATE USER aaronIDENTIFIED EXTERNALLYDEFAULT TABLESPACE USERSTEMPORARY TABLESPACE tempQUOTA 15m ON dataPASSWORD EXPIRE;


Changing User Quota on Tablespaces

ALTER USER aaronQUOTA 0 ON USERS;

• A user’s tablespace quotas may be modified for any the following situations:• Tables owned by a user exhibit unanticipated

growth.• An application is enhanced and requires

additional tables or indexes.• Objects are reorganized and placed in different

tablespaces.• To modify a user’s tablespace quota:


Dropping a User

• Use the CASCADE clause to drop all objects in the schema if the schema contains objects.

• Users who are currently connected to the Oracle server cannot be dropped.

DROP USER aaron;

DROP USER aaron CASCADE;


Obtaining User Information

Information about users can be obtained by querying the following views:• DBA_USERS• DBA_TS_QUOTAS


Summary

In this lesson, you should have learned how to:• Create users by specifying the appropriate

password mechanism• Control usage of space by users


Practice 15 Overview

This practice covers the following topics:• Creating users• Displaying data dictionary information about users • Removing user quotas

User Management

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