Question about newspaper frequent switches

I support a database Oracle 10 g (10.2.0.4) server and database activity increased until, during the heaviest parts of the day, the newspaper of the switches are produced too often (15-20 times per hour!). We also use Data Guard to replicate the database on our site of DR. We currently have 2 groups of newspapers with 2 members of each group.

I understand that I can address this issue in 2 ways: either to increase the size of my recovery of the log files (they are currently 50 Meg each), or I can add make additional journal groups to the database.

I would like to get some opinions on whether on solution is better than the other, or the advantages and disadvantages of each action.

Thanks in advance for your advice with my question!

The two solutions solve different problems.

Increase in the size of the log files, it is preventing log switches occur too often.
Add redo log groups ensures that if you frequent newspaper switches your database doesn't stop waiting for archive to catch up.

If you generate logs of 50 MB x 20 = 1 GB to repeat information on time and your log files are 50 MB a piece, you'll always have 20 journal of the switches / hour regardless of the number of redo log groups adding redo log groups buys archiver of time.

Imagine that you have only 2 redo log groups and start generating this recovery at T = 0. At T = 4 minutes, the first newspaper group fills so newspaper group 2 becomes active and the archiver begins it archiving. At T = 6 minutes, the second group of log fills up. If the archiver is not done, the database must stop and wait the archiver catch up. Adding groups of newspapers again you give a larger buffer just in case you get a flurry of activity.

Justin

Tags: Database

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