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