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BI SQL # 182 : SQL Server DBA Scripts : Page Life Expectancy

Hi Folks,

In this article we are going to cover Page Life Expectancy.

In this post we are going to discuss following points:

  • Problem Statement of SQL Script:
  • Description of SQL Script:
  • SQL Script Output Column
  • SQL Script Code
  • SQL Script Output Screenshot
  • User Level to execute

Problem Statement of SQL Script:

Get page life expectancy.

Description of SQL Script:

This Transact-SQL script lists page life expectancy.

SQL Script Output Column


SQL Script Code


SELECT ple.[Node]
    ,LTRIM(STR([PageLife_S] / 3600)) + ':' + REPLACE(STR(
            [PageLife_S] % 3600 / 60, 2), SPACE(1), '0') + ':' + 
    REPLACE(STR([PageLife_S] % 60, 2), SPACE(1), '0') [PageLife]
    ,dp.[DatabasePages] [BufferPool_Pages]
    ,CONVERT(DECIMAL(15, 3), dp.[DatabasePages] * 0.0078125) 
    ,CONVERT(DECIMAL(15, 3), dp.[DatabasePages] * 0.0078125 / 
        [PageLife_S]) [BufferPool_MiB_S]
    SELECT [instance_name] [node]
        ,[cntr_value] [PageLife_S]
    FROM sys.dm_os_performance_counters
    WHERE [counter_name] = 'Page life expectancy'
    ) ple
    SELECT [instance_name] [node]
        ,[cntr_value] [DatabasePages]
    FROM sys.dm_os_performance_counters
    WHERE [counter_name] = 'Database pages'
    ) dp ON ple.[node] = dp.[node]

SQL Script Output Screenshot


User Level to execute


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