- Is the TOTAL number of physical reads a query did = [physical reads] + [read-ahead reads]?
- Why sometimes we have [physical reads]=0 while the [read-ahead reads]>0? what does that mean?
- How many pages SQL Server reads in one physical read? … if it is one to one, then
- Why when “select * from aTable”, the number of [physical reads] and/or [read-ahead reads] does not equal the table’s number of pages? although the cache was cleared before executing the query.
- why sometimes [logical reads] is greater than [physical reads] + [read-ahead reads], and even greater than the total number of pages of the table?
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