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The online redo logs are Oracle s means of ensuring that all the changes made by the users are logged, in case there s a failure before those changes can be written to permanent storage. Thus, redo logs are fundamental for the recovery process.

Oracle organizes its redo log files in redo log groups, and you need to have at least two different groups of redo logs with at least one member in each. You need to have at least two redo groups, because even when one redo log is being archived, the log writer should be able to write to an active redo log. Although your database will run just fine with only one member in each redo log group, Oracle strongly recommends that you multiplex the online redo logs. Multiplexing simply means that you maintain more than one member in each of your redo log groups. All members of a redo log group are identical multiplexing is designed to protect against the loss of a single copy of a log file. When you multiplex the online redo log files, the log writer writes simultaneously to all the members of a group.

Figure 5-46. Message buffers managed internally by Rendezvous daemons When a message arrives, it is put in an incoming event queue for subsequent delivery to the target application. A single RV client can contain multiple applications that communicate through a local shared daemon, as shown in Figure 5-47.

Tip Always multiplex the online redo log, as you can lose data if one of the active online redo logs is lost due to a disk problem. The multiplexed redo logs should ideally be located on different disk drives under different disk controllers.

Mirroring will protect you from a disk failure, but it will not protect you against an accidental deletion of files. Multiplexing ensures that your files are protected soundly against such errors. If you lose an online redo log, you may lose valuable data, so under a multiplexed redo log system, the LGWR background process, which is in charge of writing redo log data from the redo log buffer, writes simultaneously to all the (identical) members of a multiplexed group. If there are problems writing to one member of a multiplexed group of redo logs, the writes to the other members continue unhindered.

When you multiplex redo log files, you are maintaining identical copies of the same files. Let s say you create two copies of a redo log file. You need to create a redo log group to contain these two identical files, which are called members of the group. At any given time, the LGWR process will write to a single group of redo log files, and the members of that group are then said to be current. Here are some basic conditions for Oracle redo log groups: All redo log files in a group must be identically sized. Although you can put both members of an online redo log group on the same physical disk, it s smart to locate them on different disks so one identical member can survive a disk crash that involves another member of the same group. Oracle will continue to write to the surviving members of the online redo log group when one member is not writable (perhaps due to a problem involving the disk drive).

20. TIBCO Rendezvous (technical report, http://cf.tibco.com/eval/tibrv.cfm).

You can create online redo log groups when you create a database for the first time. Here s an example showing just the redo log creation statement as part of the database creation process. Note that the three redo log groups each have only a single member they are not multiplexed at this point.

SQL> CREATE DATABASE . . . LOGFILE GROUP 1 ('/u01/app/oracle/nicko/redo01.log') SIZE 100M, GROUP 2 ('/u01/app/oracle/nicko/redo02.log') SIZE 100M, GROUP 3 ('/u01/app/oracle/nicko/redo03.log') SIZE 100M, . . . Database created. SQL>

Figure 5-47. Multiple applications sharing a local Rendezvous daemon Rendezvous clients are typically linked in a network, where clients talk directly to other clients, as shown in Figure 5-48.