The following is tip #13 from "20 tips on protecting and recovering Exchange data in 20 minutes," excerpted from the book, "Mission Critical Microsoft Exchange 2003" (Digital Press, a division of Elsevier, Copyright 2004). For more information about this book and other computing titles, please
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Once again, at this point in the operation, the backup application does not need the help of ESE for a while. The backup application simply calls HrESERestoreOpenFile (ESE does use this call to create the metadata needed for the restore.env file) for each log or patch file to be restored and copies these files to the temporary directory specified at the start of backup by the administrator (note that patch files are no longer used after Exchange 2000 SP2).
The log and patch files are copied to the temporary directory because of the requirement to keep them separate from the log files in the production log file directory. This prevents naming conflicts or overlaps between log files in the backup set and the log files on disk. The best course is to copy the log files from the backup set to the temporary directory.
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About the author: Jerry Cochran is a contributing editor for Windows IT Pro and Exchange & Outlook Administrator and a group program manager for Microsoft. He is the author of Mission-Critical Microsoft Exchange 2000 (Digital Press).