locked
Warning regarding Log sequence numbers RRS feed

  • Question

  • Hello,

    I have a Windows 2003 domain with Exchange 2003 SP2 in frontend backend topology. I am seeing this warning in event viewer:

    Event Type: Warning
    Event Source: ESE
    Event Category: Logging/Recovery
    Event ID: 514
    Date:  0000000
    Time:  0000000 PM
    User:  N/A
    Computer: mail

    Description:
    Information Store (668) First Storage Group: Log sequence numbers for this instance have almost been completely consumed. The current log generation is 1016000 (0x000F80C0) which is approaching the maximum log generation of 1048559 (0x000FFFEF), there are 32559 (0x00007F2F) log generations left to be used. To begin renumbering from generation 1, the instance must be shutdown cleanly and all log files must be deleted. Backups will be invalidated.

    Should I be concerned of this warning and what does this mean?

    Thanks


    Tom
    Monday, January 23, 2012 8:43 PM

Answers

All replies

  • Yes. See:

    http://support.microsoft.com/kb/830408

    Store databases are dismounted without warning or users cannot log on to their mailboxes in Exchange Server 2003 or in Exchange 2000 Server

     

     

    Monday, January 23, 2012 9:20 PM
  • Log Sequence is going to Complete.You need to reset the log sequence.

    Dismount the Database

    Move the log files and .chk file manually to a Different Location.

    Mount the Database Back

    New log sequence will be created

    Befor you dismount , make sure if you don't have 623 events .

     

    Regards

    Satheshwaran Manoharan

     

     

    • Proposed as answer by Terence Yu Tuesday, January 24, 2012 2:30 AM
    Monday, January 23, 2012 11:45 PM
  • In my case, it is Exchange 2003. If I dismount the store and move the logfiles and chk file to an alternate location, will the database mount? For example, if the last ten transactions were not committed to the database, how will the database mount? Is there a detailed procedure to perfrom this with less risk?

     

    TIA


    Tom
    Tuesday, January 24, 2012 1:46 AM
  • In my case, it is Exchange 2003. If I dismount the store and move the logfiles and chk file to an alternate location, will the database mount? For example, if the last ten transactions were not committed to the database, how will the database mount? Is there a detailed procedure to perfrom this with less risk?

     

    TIA


    Tom


    The KB I linked shows how to resolve. See below. When you gracefully dismount the store, it should be in a clean shutdown state, so you wont need the logs to mount it later.

     

    To work around this issue, you can use the Microsoft Exchange Troubleshooting Assistant tool because it automates the process of verifying the health of your databases and resetting the transaction log sequence.

    To download the Microsoft Exchange Troubleshooting Assistant, visit the following Web site:
    http://www.microsoft.com/downloads/details.aspx?familyid=4BDC1D6B-DE34-4F1C-AEBA-FED1256CAF9A&displaylang=en (http://www.microsoft.com/downloads/details.aspx?familyid=4BDC1D6B-DE34-4F1C-AEBA-FED1256CAF9A&displaylang=en)  
    After that, you can follow the instructions in the following Web pages to reset the transaction log sequence:
    http://technet.microsoft.com/en-us/library/aa998611(EXCHG.80).aspx (http://technet.microsoft.com/en-us/library/aa998611(EXCHG.80).aspx)  
    http://technet.microsoft.com/en-us/library/bb266925(EXCHG.80).aspx

     

    • Proposed as answer by Terence Yu Tuesday, January 24, 2012 2:29 AM
    Tuesday, January 24, 2012 2:07 AM
  • Thanks.

    1. Does Microsoft Exchange Troubleshooting Assistant tool run on Exchange 2003?
    2. Should I install this tool on Exchange 2003 backend server or can I run this from a member server in the domain with Exchange 2003 management console installed?
    3. Can I run this tool and reset the log sequence numbers in online mode without dismounting the information store?

    TIA


    Tom
    Tuesday, January 24, 2012 11:41 AM
  • 1. Yes. http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=25213

    2. I would run it from the server you want to troubleshoot.

    3. THe store needs to be dismounted. The Assistant will help you automate and check what you need. I would take care of this as soon as possible.

     

    • Marked as answer by TSAM Tuesday, January 24, 2012 2:05 PM
    Tuesday, January 24, 2012 1:57 PM
  • I just downloaded the tool and tried to launch it, requires .Net Framework 1.1 which is back dated. Anyone find a better version please let me know.

     
    Tuesday, September 3, 2013 4:25 PM