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Oracle DBAs have traditionally used a large number of tablespaces for managing database objects. Unfortunately, the larger the number of tablespaces in your database, the more time you ll have to spend on mundane tasks, such as monitoring space and allocating space to the tablespaces. Disk contention between indexes and tables and other objects were pointed out as the reason for creating large numbers of tablespaces, but with the types of disk management used today in most places, where Logical Volume Managers stripe operating system files over several disk spindles, traditional tablespace-creation rules don t apply. You re better off using a very small number of tablespaces perhaps just four or five to hold all your data.

Once the grace period expires, the receiver can assume message 101 isn t going to arrive and can get to work on message 102 If message 101 arrives during the grace period, the receiver can immediately process messages 101 and 102 in succession If message 101 arrives after the grace period expires, you have a problem Another solution to race conditions is to distribute the multicasting machinery throughout the system, as peer-to-peer architectures do Instead of having A send two notifications, n11 and n12, it sends only the first one In this notification, A adds extra information telling B to send n12 to C before doing anything else The system is shown in Figure 3-43..

If only a few data blocks are corrupted, and the rest of the datafile is good, you should consider performing a block media recovery instead of a datafile recovery. You can perform a block media recovery only through RMAN. Even if you re using your own backup and restore techniques, you can still perform a block media recovery through RMAN by using the CATALOG command to first register the necessary datafiles and archived redo log backups with RMAN.

Most traditional recoveries are file-based media recoveries Whether you use RMAN or user-managed recovery techniques, recovery traditionally has meant the restoration and recovery of the datafiles, archived redo logs, and control files If you lost an entire database or entire datafile due to media problems, you had no recourse but to use the file-based recovery techniques However, if you were trying to undo user errors or to recover an accidentally dropped table, traditional recovery techniques proved to be overkill and were time consuming Over the last few years, Oracle has developed several non-file-based recovery techniques In these techniques, the emphasis isn t on restoring and recovering files, but on using either undo data, redo logs, or the new Flashback logs to restore lost objects.

Here s a list of these non-file-based recovery techniques: Flashback: Flashback techniques enable you to recover dropped tables or restore a table or a database to a past point in time 8 dealt with the Flashback Query, Flashback Versions Query, Flashback Transactions, and Flashback Table techniques, since that chapter discussed undo data, which is the basis for these techniques In this chapter, as I ve mentioned before, I ll cover the other two important Flashback techniques Flashback Drop and Flashback Database LogMiner: Oracle s LogMiner utility lets you mine your redo logs, both online and archived, to uncover and undo erroneous changes to your database I discuss the LogMiner technique later in this chapter Data Pump: You may also consider Oracle s Data Pump Export and Import tools as alternative tools for recovering lost objects 14 discusses the Data Pump technology in detail.

n1.2

Although the traditional file-based recovery techniques have been faithful standbys for a long time, you should consider using the alternative techniques wherever you can use them instead of the older techniques For example, you can use the Flashback Database feature to revert your datafiles to their state at a past time, thus achieving the same end result as a file-based point-in-time recovery, but more quickly, since you don t have to restore backed-up datafiles, and you apply only a limited amount of redo compared to media recovery..