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Exchange Server log buffers

The following is tip #6 from "25 Exchange 2003 Tips in 25 minutes"

The following is Tip #6 from "25 Exchange 2003 Tips in 25 minutes." This content is excerpted from Scott Schnoll's book, "Microsoft Exchange 2003 Distilled," brought to you by © (2004) Pearson Education, Inc. Publishing as Addison-Wesley Professional. Return to the main page for more tips on this topic.

As a database that passes the ACID (Atomic, Consistent, Isolated, and Durable) test for transaction-based activity, Exchange first writes all activity to transaction logs and then commits the transactions to the database file. But before Exchange writes anything to a transaction log, it first holds the information in memory in an area called log buffers. Unlike the settings mentioned so far, which are registry values, the size of the log buffers is controlled by an attribute of the information store object in Active Directory -- msExchESEParamLogBuffers.

Throughout the product life of Exchange 2000, the recommended best practice setting for the msExchESEParamLogBuffers attribute changed a few times. Out of the box, it was set to 84, which was determined to be too low for heavily used servers, especially clustered back-end servers. When Service Pack 2 for Exchange 2000 was released, Microsoft recommended that customers adjust this value from 84 to 9000. When Service Pack 3 was released, Microsoft recommended that customers readjust the value down from 9000 to 500. Because the out-of-the-box value for msExchESEParam LogBuffers in Exchange 2003 is 500, you will want to use the ADSI Edit tool to delete any manual tuning entries (even if set to 500) and return the value for this attribute back to <Not Set >.

Get more "25 Exchange 2003 Tips in 25 minutes." Return to the main page.

About the author: Scott Schnoll, an Expert on, is an MCT, MCSA and a long-time Microsoft Most Valuable Professional (MVP).

In addition to writing "Microsoft Exchange Server 2003 Distilled," he is a co-author of the upcoming "Exchange 2003 Resource Kit from Microsoft Press" and lead author for "Exchange 2000 Server: The Complete Reference."

Scott has written numerous articles for Exchange & Outlook Magazine, and is a regular speaker at Microsoft conferences, including MEC and TechEd, as well as industry conferences such as Comdex and MCP TechMentor, where he covers topics such as Exchange, clustering, Internet Information Services and security.

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