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Buffer catch Hit ration


Buffer catch Hit ration

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saidapurs
saidapurs
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Hi All,
I am getting a alerts Buffer catch Hit ration 100% and when i check buffer manager details through resource monitor found some below details.

SQL SERVER BUFFER MANAGER :
Buffer catch hit Ratio 100.000
Free list stalls/sec 0.000
Free pages 1321.000
Page life expectancy 4136748.000
Page reads/sec 0.000


I am using Win server 2008 with 8GB RAM, let me know how do i fix this issue.

Thanks & Regards
Satish
GilaMonster
GilaMonster
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There's nothing there that looks like it needs fixing.

Buffer cache hit ratio - higher is better, so 100 is good, not a problem that needs fixing.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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saidapurs
saidapurs
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Hi Gila,
Thanks for response but i am getting below alert from server

This is an auto generated e-mail triggered because of the following entities being monitored :
Monitor GLEEMASTER-50.17.199.171-MSSQL [IF-gleemaster.com_MSSQL-DB-server_1433]
Attribute Health
Reasons Health of GLEEMASTER-50.17.199.171-MSSQL is critical


Let me advice what shall i response to my boss....

Thanks
Satish
GilaMonster
GilaMonster
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That the alert is set up in error, buffer cache hit ratio of 100 is good, not bad.

Double-check what the alert was actually complaining about. It is was buffer cache hit ratio, you can ignore it.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


chandan_jha18
chandan_jha18
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As Gail suggested above, the higher is this ratio the better. It simply means that your memory is having sufficient amount of data in the cache which will reduce the physical I\O operations.

However, if you are really interested to go deeper into this analysis, create your small warehouse for analysis of memory,disk and cpu counters over the period of time(say 2 weeks) so that you can have a fair bit of idea on the overall processing. you may use DMVs or the good old perfmon but make sure that during this period you do not reboot sql server or use dbcc commands to flush the cache because logically it will impact the analysis negatively.

Thanks
Chandan
saidapurs
saidapurs
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Hi,

Thank you Gila & Chandan...


---
Satish
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