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SQL Server buffer page life script

SQL Server Scripts by Burleson Consulting

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-- page_life.sql
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If the DBA is seeing low readings for the buffer cache hit ratio, the Page Life Expectancy statistic should be checked. This statistic indicates the length of time SQL Server estimates a page will remain in the buffer cache.

Obviously, pages served from memory result in much
shorter response times than pages that must be read from disk and then
into the cache. So, it is wise for often used data to be pinned in the
buffer cache. The page_life query easily provides the DBA with this measure:

select
cntr_value
from
master..sysperfinfo
See code depot for full script
where
object_name = 'SQLServer:Buffer Manager' and
counter_name = 'Page life expectancy'

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