TX Log size management

  • The DB in question here is running on SQL7.

    I have a couple of questions, and would be very grateful if somebody could help to point me in the right direction.

    1/ I have a database maintanence plan that does a back up of a txlog every hour between a certain time frame. According to the SQL Server Agent Job, the job succeeds with no errors - however no backup (.trn) file appears in the specified folder, and the tx log is not truncating at the same time?! Any ideas?

    2/ Because of the first problem the total allocated space for the txlog has now reached approx 4368Mb, shocking I know!!! Can someone help, and give advice on how I should go about shrinking this? Where do i start, what T-SQL do I need, what can be done in EM, what should I look out for??

    Anyones help appreciated.

    TIA.

  • 1/ 3 things, check the MSDB database for the backup set this should help but still needs some work.

    select

    database_name,

    [name] backup_name,

    [description] backup_description,

    case device_type

    WHEN 5 then 'Tape'

    WHEN 2 Then 'Drive'

    WHEN 102 THEN 'Drive'

    END device_type,

    device_type x,

    case type

    when 'L' Then 'Log'

    when 'D' then 'Full'

    when 'I' then 'Differential'

    end Backup_Type,

    physical_device_name

    from

    backupmediafamily bumf

    inner join

    backupset bus

    ON

    bumf.media_set_id = bus.media_set_id

    WHERE

    type = 'L'

    Also, check the Event Viewer logs for issues pertaining to te backup.

    Otherwise drop and recreate the maintainence plan to see if corrects.

    2/ Do a backup log yourself thru T-SQL like so

    BACKUP LOG [dbName]

    TO DISK='Drive:\path\file.ext'

    WITH

    INIT,

    NAME = 'dbName Log Backup'

    Then run this script after the file is created and backedup to force the file to shrink.

    http://www.sqlservercentral.com/scripts/scriptdetails.asp?scriptid=26&CategoryNm=Maintenance%20and%20Management%20&CategoryID=1

    Then set size of the Transaction log to the value you want as this may have shrunk below that, there EM.

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