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current incarnation RMAN can recover through multiple incarnations of a database For example, if you have backups from an older incarnation of the database, you can use them to recover your current database incarnation, but you must specify that the backups are coming from a previous incarnation The Simplified Recovery Through Resetlogs feature lets you use archived redo logs from an earlier incarnation of the database The default format for the LOG_ARCHIVE_FORMAT initialization parameter now includes a %r component, which stands for the RESETLOGS identifier For example, on a UNIX/ Linux system, your archived redo logs will use the format log%t_%s_%rarc The variable t stands for the thread number, and the variable s is the log sequence number The V$LOG_HISTORY view has two columns, RESETLOGS_CHANGE# and RESETLOGS_TIME, that indicate the database incarnation of the archived redo logs.

The point-in-time recovery example in the previous section dealt with recovery using the current incarnation of the database Let s look at incomplete database recovery using a parent incarnation of the database Suppose you want to specify an SCN that isn t in the current incarnation, but is in an ancestor incarnation There are two requirements for this type of a point-in-time recovery: You must reset the current incarnation of the database back to the incarnation to which your target SCN belongs You must use the control file from the older incarnation that contains the target SCN To perform point-in-time recovery to the older incarnation, use the following steps: 1 Find out the incarnation key for the incarnation that was current at the time you want to recover your database to You can find it in the incarnation key column of the output of RMAN s LIST INCARNATION command.

Let s say our incarnation key value for this example is 2 2 Start the database in the following way: RMAN> STARTUP FORCE NOMOUNT; 3 Reset the current incarnation to the incarnation that was current at the point in time that you want to recover to: RMAN> RESET DATABASE TO INCARNATION 2; 4 Restore the old control file from a backup and mount the database with the following commands: RMAN> RESTORE CONTROLFILE FROM AUTOBACKUP; RMAN> ALTER DATABASE MOUNT; 5 Restore and recover the database until the point in time or the SCN: RMAN> RESTORE DATABASE; RMAN> RECOVER DATABASE UNTIL SCN 1000; 6 Open the database after resetting the online log files: RMAN> ALTER DATABASE OPEN RESETLOGS; Oracle calls the preceding type of recovery Simplified Recovery Through Resetlogs.

Figure 7-51. A 2-pole, 3-throw switch When dealing with multi-pole switches, you can qualify the exit number for a signal with the letter of the input pole. For the 2P3T switch in Figure 7-51, the exits for signal A can be labeled A1, A2, and A3. All poles are switched as a group. For example, when A is switched to A2, B is also switched to B2.

This feature comes in handy when you perform a point-in-time recovery or a recovery using a backup control file and use the RESETLOGS option to open the database In these cases, you can still use the backup from before the RESETLOGS operation..

You can assign a user a tablespace quota, thus limiting the user to a certain amount of storage space in the tablespace. You can do this when you create the user, or by using the ALTER USER statement at a later time. 11 shows you how to assign tablespace quotas to users. In 9, I discuss Oracle s Resumable Space Allocation feature. User-quota-exceeded errors are an important type of resumable statement. When a user exceeds the assigned quota, Oracle will automatically raise a space-quota-exceeded error.

Software switches are controlled by objects. The controllers are often late Binders, as described in 10. To indicate the controller of a switch, a dashed line can connect the switch either to the controller or to a label indicating the name or ID of the controller. Figure 7-52 shows both cases.