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Too often, the first encounter a DBA has with a defective backup strategy occurs during a frustrating recovery session of a production database. You can attribute the vast majority of problems encountered during recovery to inadequate or even nonexistent planning and testing of the backup and recovery strategy. The time to find out whether your database is recoverable is most definitely not when you are trying to recover a production database in the dead of night. To avoid a catastrophic recovery experience, every DBA should have established and tested backup and disaster recovery plans. Always validate your backups and make sure that the backups are actually readable. Check for corrupted blocks in the backed-up files, so recovery doesn t become impossible due to bad files. The RMAN utility and user-managed backups both offer ways to check for data block corruption. I discuss these features in the Database Corruption Detection section later in this chapter. You should also make periodic restoration tests mandatory for all key databases.

For example, using a serializable transaction (which is more common in the J2EE environment, where many tools automatically use this as the default mode of isolation, often unbeknownst to the developers), you would observe the following behavior. Notice that the SQL prompt contains information about which session is active in this example: OPS$TKYTE session(261,2586)> set transaction isolation level serializable; Transaction set. OPS$TKYTE session(261,2586)> update id_table 2 set id_value = id_value+1 3 where id_name = 'MY_KEY'; 1 row updated. OPS$TKYTE session(261,2586)> select id_value 2 from id_table 3 where id_name = 'MY_KEY'; ID_VALUE ---------2 Now, we ll go to another SQL*Plus session and perform the same operation, a concurrent request for a unique id: OPS$TKYTE session(271,1231)> set transaction isolation level serializable; Transaction set. OPS$TKYTE session(271,1231)> update id_table 2 set id_value = id_value+1 3 where id_name = 'MY_KEY'; This will block at this point, as only one transaction at a time can update the row. This demonstrates the first possible outcome we would block and wait for the row. But since we re using SERIALIZABLE in Oracle, we ll observe the following behavior as we commit the first session s transaction: OPS$TKYTE session(261,2586)> commit; Commit complete. The second session will immediately display the following error: OPS$TKYTE session(271,1231)> update id_table 2 set id_value = id_value+1 3 where id_name = 'MY_KEY';

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Always keep a redundancy set online so you can recover faster. A redundancy set is defined as the following: Last backup of all datafiles Last backup of the control file Multiplexed copies of the current redo log files Copies of the current control file that s being used All the archived redo logs since the last backup You may also include the SPFILE or the init.ora, listener.ora, and tnsnames.ora files in your redundancy set. If you have such a redundancy set, you can recover from a media failure that results in any of the possible losses: a datafile, control file, or online redo log. Make sure you save the redundancy set on completely separate physical volumes and RAID systems than those on which the datafiles, online redo log files, and control files are located. This separation of the redundancy set and the active database files guarantees that you ll never lose any uncommitted data due to media failure.

ops$tkyte@ORA10G> select rowid 2 from range_example 3 where range_key_column = to_date('02-jan-2005','dd-mon-yyyy'); ROWID -----------------AAARmgAAKAAAI+iAAC As long as you understand that the ROWID of the row will change on this update, enabling row movement will allow you to update partition keys.

The ideal way to maintain a redundancy set is to use the flash recovery area, as described in the section The Flash Recovery Area later in this chapter. This way, you can maintain the redundancy set in one location on disk and automatically manage this space. Your recovery time will be reduced, as all the necessary backups that are part of your redundancy set are maintained on the disk itself.

update id_table * ERROR at line 1: ORA-08177: can't serialize access for this transaction That error would occur regardless of the ordering of the commit statement above All it takes is for your transaction to attempt to modify any record that was modified by some other session since your transaction began So, that database-independent piece of logic really isn t database independent at all It may not even perform reliably in a single database, depending on the isolation level! Sometimes we block and wait; sometimes we get an error message To say the end user would be upset in either case (wait long time, or wait long time to get error) is putting it mildly This issue is compounded by the fact that our transaction is much larger than just outlined.

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