How Db2 assigns I/O priorities

Db2 informs z/OS® about which address space's priority is to be associated with a particular I/O request.

WLM handles the management of the request from after that. The table below describes to which enclave or address space Db2 associates I/O read requests.

Table 1. How read I/O priority is determined
Request type	Synchronous reads	Prefetch reads
Local	Application's address space	Application's address space
DDF	Enclave priority	Enclave priority

The table below describes to which enclave or address space Db2 associates I/O write requests.

Table 2. How write I/O priority is determined
Request type	Synchronous writes	Deferred writes
Local	Application's address space	`ssnm`DBM1 address space
DDF	DDF address space (`ssnm`DIST)	`ssnm`DBM1 address space