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The techniques you ve seen thus far show that both RMAN and user-managed recovery strategies are reliable methods for restoring databases when there s a media-related problem. However, suppose you only need to undo some changes in the database. Even the incomplete recoveries, though they remove unwanted changes, will lead to a loss of data. In addition, sometimes you can t determine exactly when a change was made, so you can t make a precise incomplete recovery. You may also have to close the database to your users during the recovery process if you are recovering the entire database. Fortunately, you can use several other more granular recovery methods when your needs are more precise. The TSPITR method enables you to recover a tablespace until a specified point in the past. The LogMiner utility, which Oracle provides free of charge, enables you to perform extremely precise recovery based on a reading of the changes recorded in the redo logs. In addition, you can use the Flashback Query feature to identify and recover lost data or wrongly committed incorrect data. Depending on your needs, you may find one of these alternatives a better way to fix data loss problems than having to restore and recover the database every time you have to undo the results of an application error.

multicast situation, the first handler might set P to one state, but a subsequent handler might set P to a different state. After multicasting the notification to all subscribers, P would have the state set by the last event handler. The states saved by the previous handlers would be lost. Such a system would probably behave erratically, depending on the multicast order to subscribers. As a practical example, consider a multicast notification used to allow subscribers to cancel a Closing operation that is about to take place. For the purposes of this discussion, it doesn t matter what the Closing operation is about to close. What counts is the fact that event subscribers are given the chance of vetoing an operation in progress by returning a certain value. The notification might have the following C# signature: void OnClosing(ref bool doCancel); An event handler would set doCancel to true to veto the Closing operation. If there were two handlers, one called after the other, the second handler would overwrite the first one s doCancel value. When dealing with multicast events, you must take special precautions to safeguard any byreference parameters set by notification handlers. Such parameters are passed by address, so the callee has the opportunity to replace the object being pointed at with a new one. Fortunately, the solution is simple and involves the use of envelopes, described at the end of this chapter. An envelope is nothing more than a holder of objects. Envelopes allow event handlers to put values into it, without disturbing values already in it. The envelope then can carry back to the sender all the values set by each event handler.

Suppose you or one of the users of your database has dropped a table by mistake. Or, as it happens sometimes, you truncated the wrong table or you wrongly deleted (or inserted) data into a table. You don t have to recover the entire database when you need to bring back the table s contents. You can use Oracle s TSPITR technique to recover the tablespace containing the lost table to a point in time that s different from the rest of the database. You can perform TSPITR using RMAN, or you can manage the whole process manually. Essentially, you have to use an auxiliary database so you can recover the tablespace (or tablespaces) to the desired point in time before the damaging action occurred. Once the tablespace is recovered to that clean point, it is brought back to the main database. RMAN makes the TSPITR type of recovery very easy.

You recover the tablespaces from the database (the target database) by first performing the PITR in a temporary instance called the auxiliary database, which is created solely to serve as the staging area for the recovery of the tablespaces.

Here s how to use RMAN to perform a TSPITR: 1 Create the auxiliary database Use a skeleton initialization parameter file for the auxiliary instance along the lines of the following: db_name=help (this is the target database_name) db_file_name_convert=('/oraclehome/oradata/target/', '/tmp/') /* Lets you convert the target database datafiles to a different name */ log_file_name_convert=('/oraclehome/oradata/target/redo', '/tmp/redo') /* Lets you convert the target database redo log files to a different name */ instance_name=aux control_files=/tmp/control1ctl compatible=1110 db_block_size=8192 2 Start up the auxiliary database in the nomount mode: $ sqlplus /nolog SQL> CONNECT sys/oracle@aux AS sysdba SQL> STARTUP NOMOUNT PFILE = /tmp/initauxora 3 Generate some archived redo logs and back up the target database You can use the ALTER SYSTEM SWITCH LOGFILE command to produce the archived redo log files 4.