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As you can see, four different users, all owners of various Oracle components, have quotas in the Sysaux tablespace, and the user RMAN has a quota on a tablespace created exclusively for the Recovery Manager s use. Since they aren t mandatory, you can create a database without a default temporary tablespace or a default (permanent) tablespace. In such a case, you can assign both tablespaces explicitly when you create a new user. You can also assign a quota on the default permanent tablespace. Here s an example showing how to create a user by explicitly specifying the default tablespaces (temporary and permanent). The GRANT QUOTA clause gives the user a 500MB space allocation in the USERS tablespace so the user can create objects there: SQL> CREATE USER salapati IDENTIFIED BY sammyy1 TEMPORARY TABLESPACE TEMPTBS01 DEFAULT TABLESPACE USERS QUOTA 500M ON USERS; User created. SQL>

If you omit the QUOTA clause, the new user can t use any space in the tablespace USERS, which is the default tablespace for the user. If you have created a permanent default tablespace, as recommended by Oracle, you can omit the DEFAULT TABLESPACE clause. If you haven t, you should specify the DEFAULT TABLESPACE clause; otherwise, the new user will be assigned the System tablespace as the default tablespace and that s not a good idea, since you don t want users possibly creating objects in the System tablespace.

You use the ALTER USER statement to alter a user in the database. Using this statement, you can do the following: Change a user s password. Assign tablespace quotas. Set and alter default and temporary tablespaces. Assign a profile and default roles. Here s an example showing how a DBA (or the user being altered) can use the ALTER USER command to change a user s password: SQL> SHOW USER USER is "SALAPATI" SQL> ALTER USER salapati IDENTIFIED BY sammyy1; User altered. SQL> Only a DBA or another user to whom you ve granted the ALTER USER privilege can change passwords with the ALTER USER statement. Users can also change their own passwords with the PASSWORD command in SQL*Plus, as shown here: SQL> PASSWORD Changing password for SALAPATI Old password: ********* New password: ********* Retype new password: ********* Password changed SQL> Whether users assign their own passwords or a DBA creates their passwords, a DBA won t ever be able to find out what any user s password is, since all passwords are stored in the encrypted form. However, I ll show you later in this chapter how to log in as another user by making use of the encrypted password.

Public Class FormMain Inherits System.Windows.Forms.Form Private _orderSystem As New OrderSystem Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() ComboBoxColors.Items.Add("White") ComboBoxColors.SelectedIndex = 0 columnHeaderOptions.Width = -2 DisplayQueuedMessages() End Sub ' Private Sub ButtonGetModels_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles ButtonGetModels.Click Dim models As String() = _orderSystem.GetModels() ComboBoxModels.Items.Clear() If models Is Nothing Then Return For Each model As String In models ComboBoxModels.Items.Add(model) Next ComboBoxModels.SelectedIndex = 0 End Sub ' auto size last column

You must perform regular backups of any database that contains useful information All databases depend on mechanical components like disk drives, and they are also subject to unexpected events like power failures and natural catastrophes Programmatic and user errors also necessitate protecting data through a strong backup system Recovery involves two main objectives: first, you must return the database to a normal operating state with as little downtime as possible Second, you mustn t lose any useful data It s important to understand the basics of how Oracle manages its backup and recovery operations You ve seen some of the components previously, but I put it all together here The following Oracle structures ensure that you can recover your databases after a problem: The control file: The control file contains datafile and redo log information, as well as the latest system change number, which is key to the recovery process.

Database backups: These are file or tape backups of the database datafiles Since these backups are made periodically, they most likely won t contain all the data needed to bring the database up to date The backup files include both backups of the datafiles as well as the archived redo log files The redo logs: The redo logs, as you ve seen earlier in this chapter, contain all changes made to the database, including uncommitted and committed changes The undo records: These records contain the before images of blocks changed in uncommitted transactions Recovery involves restoring all backups first Since the backups can t bring you up to date, you apply the redo logs next, to bring the database up to date.