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    Video: How to trim a Power Monitoring Expert (PME) database on a recurring schedule without archiving

    Issue
    To manage drive space limitations, it is desirable to only keep a specified amount of historical data available for reporting.  For some customers this may be 1, 2, 3...10 years. However, it is not desirable to create archive databases that have to then be deleted themselves.

    Product Line
    Power Monitoring Expert 7.x
    Power Monitoring Expert 8.x

    Environment
    SQL Server

    Cause
    An archive database takes up additional space on the hard drive, therefore it is desirable to only remove old data on a periodic basis.

    Resolution
    *Warning: Irreparable database damage can occur. This procedure should only be performed by users familiar with SQL Server Management Studio. Databases should be backed up prior to performing this procedure.*

    The attached SQL script can be added to the database as a Stored Procedure and then configured to be triggered by a SQL Agent job to run.



    1. Save the attached file that matches the version of PME installed on the server
    2. Open SQL Server Management Studio
    2. Connect to the ION SQL Server instance (providing appropriate credentials to modify ION_Data)
    3. Go to File > Open > File
    4. Browse to the saved file from this article on the PME server and open
    5. Adjust the time frame as appropriate to this system.
    By default this Stored Procedure will remove all data older than 3 years from the date ran.  
                             DATEADD(YEAR, -3, GETDATE())
    EXAMPLE: If this system needs to retain 6 years in the live database this line of code should be changed to
                             DATEADD(YEAR, -6, GETDATE())
    6. Click Execute
    7. In the left pane expand Databases>ION_Data>Programmability>Stored Procedures and ensure that dbo.DataTrimSchedule has been created.
    8. Expand SQL Server Agent
    9. Right click Jobs > New Job...
    10. Name = ION_Data Trim Schedule (This is an arbitrary name.  Just be certain to note)
    11. Click Steps > New
    12. Step name = Trim Data
    13. In the Command pane type EXECUTE [dbo].[DataTrimSchedule]
    14. Click Schedules > New
    15. Name = Trim Data 
    16. Set the frequency that meets this systems needs.  To just keep a rolling X (where X is the number chosen by the customer) amount of years in the database this could be set to monthly.  If it is desirable to
            keep a full previous X years this will need to be run yearly on January 1st.
    17. Click OK, then Click OK on the Job window.

    The system is now configured to remove "old" data on a scheduled basis and this data cannot be reclaimed after removal.

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