Page Life Expectancy Issue

Mar 17, 2008

STUCK! I have a consistent PLE value of 0. The server has 8GB RAM, I/O-CPU counters under 30%, various DMV's results show the buffer and memory cache do not calculate up to it's AWE (32-bit) allocation 7.5GB, waits don't show any problems, no locks, no blocks.

There are improvements to indexes that have to be made but where can I identify the root cause to the low PLE? The same process runs x6 quicker on 2 other much lower spec SQL servers exact copies from a data prospective, however there PLE is very high and not production.

Any ideas?

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Page Life Expectancy (PLE) is pretty bad on my server. PLE is hovering around 3 minutes "sometimes" but is usally around 20-30 seconds.

Total memory allocated to SQL ( a fixed amount ) is set at 3GB.

Of the total memory allocated, SQL Server is using 2.52GB ... so there is room if needed.

The Buffer Cache is sitting at 2.09GB with a hit rate around 99.8%.

The Procedure Cache is sitting at 378MB with a hit rate around 90.5%.


CPU is hovering around 10-20%


Free System Page Table Entries is LOW ... at 22343

Disc Queue Lengths spike quite often to above 5 and sometimes as high as 36. Usually sitting at .05 to 1.0 (and there are times when the DQLs are great and not measureable.

What I need to find out is how to get PLE above the recommended 5 minute mark???

Please let me know if there are any other items I need to note.

Thanks!

=========================================
Here are some hardware/Software/Implementation stats:
=========================================

SQL Server 2005 Standard w/ latest patch of 3152

Windows Sever 2003 R2 Standard w/ latest patches applied (says PAE is enabled in the System Properties.. General tab

4 Intel Xeon X5355 @266GHz

4GB RAM with 3GB dedicated to SQL Server via the /3GB switch


System Disc ( C: ) is 136GB (free space is 122GB) and is RAID10
Data/SQL Disc ( G: ) is 408GB (free space is 347GB) and is RAID10
The SQL files (MDFs/LDFs, TempDB, DB & TLog backups, SQL application and all that is SQL related) are all on the single array (G (** which I must note is NOT how I configured the SQL environment but aquired the setup when I started the position).

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