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To control database recovery time, you use the FAST_START_MTTR_TARGET initialization parameter to set the MTTR from a crash. To optimize performance, set the size of the redo log files so they are just large enough that Oracle isn t performing more checkpoints than required by the value of FAST_ START_MTTR_TARGET.
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The FAST_START_MTTR_TARGET parameter is discussed in detail in 16.
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If your log files are small, Oracle may perform incremental checkpointing more often than the MTTR value specifies. As has been mentioned, frequent log switching tends to promote incremental checkpoint activity, meaning that the database writer will perform excessive disk I/O. In an ideal setup, the MTTR target should govern this activity. You can access the MTTR Advisor through the Database Control, as follows: 1. From the Database Control home page, click the Advisor Central link under the Related Links section. 2. Click the MTTR Advisor link under the Advisors group. The main page of the MTTR Advisor is titled Configure Recovery Settings. You can do the following things with the help of the MTTR Advisor: Look up the tradeoff between a certain MTTR and total I/O in the Instance Recovery section. Turn archive logging on and off and enable and disable the automatic archiving of the redo logs, both through the Media Recovery section. Manage the flash recovery area (discussed in detail in 15), including its location and size, and enable and disable Flashback Database logging for fast database point-in-time recovery. You do all this from the Flash Recovery Area section.
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Managing Online Redo Logs
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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.
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CHAPTER 18 MA NA GING AND M ONITORING THE OPERATIONA L DATABA SE
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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.
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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.
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Hardware Mirroring vs. Oracle Multiplexing
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.
Online Redo Log Groups
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).
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