SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Physical reads


Physical reads

Author
Message
sqlfriends
sqlfriends
Hall of Fame
Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)

Group: General Forum Members
Points: 3872 Visits: 4018
I am a little confused about the concept of physical reads:

In Extended event, I add an event, and filter by physical_reads, the definition of it is:
physical_reads (package0.uint64)
The number of physical page reads issued by the batch.
Does this mean to read from hard disk?

Also in Performance monitor, if I select the counter SQL Server: Buffer ManagerTonguehysical reads/sec

The description is : Number of physical database page reads issued.
Does this also mean to read from physical disk or read from Buffer manager?

Thanks
pooyan_pdm
pooyan_pdm
SSC-Enthusiastic
SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)

Group: General Forum Members
Points: 194 Visits: 422
Physical Reads= data pages read from hard drive
Logical Reads= data pages read from buffer pool (data catch)

Pooyan
sqlfriends
sqlfriends
Hall of Fame
Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)Hall of Fame (3.9K reputation)

Group: General Forum Members
Points: 3872 Visits: 4018
Thanks, how about the counter:

SQL Server: Buffer ManagerTonguehysical reads/sec

Does this mean per second physical read from hard disk or buffer manager?

Thanks
pooyan_pdm
pooyan_pdm
SSC-Enthusiastic
SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)SSC-Enthusiastic (194 reputation)

Group: General Forum Members
Points: 194 Visits: 422
from Hard Drive

Pooyan
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search