Number Of Reads In Profiler

Jul 27, 2007

Hi,

Can any of can explain, what the "Reads" column in Profiler exactly mean ? I'm not comfortable with the explanation given in BOL.


"The number of read operations on the logical disk that are performed by the server on behalf of the event. These read operations include all reads from tables and buffers during the statement's execution"

For the same procedure with same parameters, if the server is not loaded much, the Reads are in a few hundreds, but when there are more than 1000 concurrent users, why it is going to millions ? What other parameters affecting this reads ? And how can I reduce it ?

Environment: SQL Server 2005 64-bit Enterprise Edition on Windows Server 2003 R2 Server x64 Enterprise Edition SP2


Thanks in Advance.

Regards

Babu

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I'm running the same query on two different PCs and tracing results in Profiler on my PC. When executing the query on PC1 - the total number of reads is 200000. When executing the same query on PC2 - the toal number of reads is 13000. It is almost 15 times more reads when executing query on PC2. The executed query is same on PC1 and PC2. Any reason for this?



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...
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/Magnus

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server: QAT on clustering server ----> 23 seconds
----------------------------------------------------
SS 2000 developer edition SP4
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root directory C:program files...
use a fixed memeroy size 640 MB

reserve physical memory for sql server
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server: MILLER ----> 3 seconds
----------------------------------------------------
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----------------------------------------------------
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=============================
http://www.sqlserverstudy.com

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