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Best Practices

One common problem that exists in many organizations today is quantity of space used by the transaction logs on an information store. By default, Exchange 2000 deletes transaction log files only when a full backup is performed. By default, circular logging is disabled. The first recommendation would be to enforce full backups on the information stores on an interval tailored to your environment. Microsoft strongly recommends leaving circular logging disabled. This enhances the recovery of Exchange 2000. Another solution would be to enable circular logging for information stores that you are not backing up. I must stress that if a disaster happens, data loss is almost guaranteed. A good example of where you might want to enable circular logging is on an NNTP feed from the Internet. Depending on the size of the feed, the transaction logs can grow to quite easily fill up your disk space. You must remember that circular logging is not an attribute of a database but an attribute of a storage group. In your production environment, you might want to create a new database and home that database in a separate storage group. Then you can enable circular logging on the relevant storage group.

If you are performing backups on the databases, make sure that you are backing up data at the storage group level and not the database level. If you select the individual databases within the storage group, they will be backed up along with multiple instances of the transaction logs. Each storage group shares one set of transaction logs. Therefore, if you have three databases within the storage group and you individually select the three databases, you will have a full backup of the three databases along with three instances of transaction logs. Your tape space may be consumed quite fast if backups are done per database.


  

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