Exchange如果不采用循環日志，在成功實現全備份前，將產生大量DB日志。當磁盤性能比較差時，Exchange將延緩日志提交到數據庫。因此這部分日志絕對不能刪除，否則DB會有問題。而那些已經提交的db的log，其實可以手工delete掉（普通刪除文件的方法）。當備份出現問題，磁盤容量又不夠時，該方法非常有用。

以下KB就是幫助用戶如何確定哪些日志已經提交，可以刪除。

XADM: Using Eseutil to Determine Which Logs Have Been Committed
View products that this article applies to.
Article ID : 182961?
Last Review : October 28, 2006?
Revision : 4.3?
This article was previously published under Q182961
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SUMMARY

MORE INFORMATION

Exchange Server 5.5

Exchange 2000 Server
SUMMARY
You can use the Eseutil utility to view the contents of the checkpoint file to determine which log files have been committed to an Exchange database.?
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MORE INFORMATION
Exchange Server 5.5
The information in this section applies to all three Exchange Server 5.5 databases: ? Dir.edb?
? Priv.edb?
? Pub.edb?
To display the Edb.chk (checkpoint) file on the screen, run the following command from a command prompt:?
eseutil /mk edb.chk | more
If you do not run eseutil from the folder where the Edb.chk file is located, you must provide the full path to the file.

In Exchange Server 5.5, there is one checkpoint file for each set of log files. There will be one Edb.chk file for the directory and one for the information store. (Priv.edb and Pub.edb share the same log files and checkpoint file.)?

The information that is displayed is similar to:? ? Microsoft(R) Exchange Server Database Utilities

? ?Version 5.5

? ?Copyright (C) Microsoft Corporation 1991-1997. All Rights Reserved.



? ?Initiating FILE DUMP mode...
? ?? ?Checkpoint file: edb.chk

? ?? ?LastFullBackupCheckpoint (8,615,203)
? ?? ?Checkpoint (22,6485,399)
? ?? ?FullBackup (8,615,203)
? ?? ?FullBackup time:3/6/1998 11:52:16
? ?? ?IncBackup (0,0,0)
? ?? ?IncBackup time:0/0/1900 0:0:0
? ?? ?Signature: Create time:2/24/1998 14:23:47 Rand:24842 Computer:
? ?? ?Env (Session, Opentbl, VerPage, Cursors, LogBufs, LogFile, Buffers)
? ?? ?? ? (? ? 168,? ?25200,? ? 4440,? ? 8400,? ?? ?84,? ?10240,? ? 8045)

? ?Operation completed successfully in 0.20 seconds.
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??
Take the first number in the parentheses for the Checkpoint field and convert it to hexadecimal. The hexadecimal number is the file name of the first uncommitted log for the appropriate directory. Circular logging works by deleting all log files with generations that are lower than the generation in the checkpoint, for example:?
Checkpoint (22,6485,399) = EDB00016.LOG?
This syntax applies for most other fields in the dump file (LastFullBackupCheckpoint, FullBackup, IncBackup, and other fields).?
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Exchange 2000 Server
In Exchange 2000, there is one checkpoint file for each storage group and one for the directory. When you try to identify the last committed log file for a storage group, note that the storage group prefix applies to the checkpoint file and to all of the log files. For example, the default first storage groups checkpoint file name is E00.chk, and its log files are E00xxxxxx.log (where xxxxx is the hexadecimal sequence number of the log file).

To display the Exx.chk (checkpoint) file on the screen, run the following command from a command prompt (from the Exchsrvr\Bin folder):?
eseutil /mk the_full_path_to_the_checkpoint_file
For example, you may run the following command:?
eseutil /mk "C:\Program Files\Exchsrvr\MDBDATA\E00.chk"
Note that you must use the quotation marks if there is a space in the path to the checkpoint file.

The output of this command is similar to:? ? Microsoft(R) Exchange Server(TM) Database Utilities
? ?Version 6.0
? ?Copyright (C) Microsoft Corporation 1991-2000.??All Rights Reserved.

? ?Initiating FILE DUMP mode...
? ?? ?? ?Checkpoint file: C:\Program Files\Exchsrvr\MDBDATA\E00.chk

? ?? ?? ?LastFullBackupCheckpoint: (0x0,0,0)
? ?? ?? ?Checkpoint: (0x6A,1119,3D)
? ?? ?? ?FullBackup: (0x0,0,0)
? ?? ?? ?FullBackup time: 00/00/1900 00:00:00
? ?? ?? ?IncBackup: (0x0,0,0)
? ?? ?? ?IncBackup time: 00/00/1900 00:00:00
? ?? ?? ?Signature: Create time:09/24/2001 17:10:26 Rand:522553071 Computer:
? ?? ?? ?Env (CircLog,Session,Opentbl,VerPage,Cursors,LogBufs,LogFile,Buffers)
? ?? ?? ?? ? (? ? off,? ? 202,??30300,? ?1365,??10100,? ? 128,??10240,??97940)

? ?Operation completed successfully in 1.192 seconds.
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??
Take the first number in the parentheses for the Checkpoint field. The hexadecimal number is the file name of the first uncommitted log for the appropriate database; in this example:?
Checkpoint (0x6A,1119,3D) = E000006A.log?
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本文轉自 bilinyee博客，原文鏈接： ? ? http://blog.51cto.com/215363/808394? ?如需轉載請自行聯系原作者

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