DSNB773I   MEMBER DETAIL STATISTICS SYNCHRONOUS READS DUE TO BUFFER INVALIDATION DATA RETURNED = r1 DATA NOT RETURNED = r2

Explanation

This message is a section of output from the DISPLAY GROUPBUFFERPOOL command, which is part of message DSNB750I.

DSNB773I and DSNB774I: Synchronous read statistics

If the DISPLAY GROUPBUFFERPOOL command included the MDETAIL option, the output includes synchronous read statistics for the group buffer pool. The term synchronous means that the coupling facility interaction is done under the execution unit of the DB2® user. 

DSNB773I - MEMBER DETAIL STATISTICS
             SYNCHRONOUS READS
               DUE TO BUFFER INVALIDATION
                 DATA RETURNED                         = r1
                 DATA NOT RETURNED                     = r2
DSNB774I -     DUE TO DATA PAGE NOT IN BUFFER POOL
                 DATA RETURNED                         = r3
                 DATA NOT RETURNED                     = r4

The following values in message DSNB773I refer to synchronous coupling facility read requests that are issued because the virtual buffer was marked invalid.

r1
The number of times that data is successfully returned from the group buffer pool in response to the request.
r2
The number of times that data is not returned from the group buffer pool in response to the request.

The values in message DSNB774I refer to synchronous coupling facility read requests that are issued because the required data was not in the buffer pool buffer.

r3
The number of times that data is successfully returned from the group buffer pool in response to the request.
r4
The number of times that data is not returned from the group buffer pool in response to the request.