IBM z13s Technical Manual page 136

data in a central fact table and is surrounded by more dimension tables that hold
information about each perspective of the data. A star schema query, for example, joins
various dimensions of a star schema data set.
DB2 utilities that are used for index maintenance, such as LOAD, REORG, and REBUILD.
Indexes allow quick access to table rows, but over time, as data in large databases is
manipulated, the databases become less efficient and must be maintained.
The zIIP runs portions of eligible database workloads, and so helps to free computer capacity
and lower software costs. Not all DB2 workloads are eligible for zIIP processing. DB2 UDB for
z/OS V8 and later gives z/OS the information to direct portions of the work to the zIIP. The
result is that in every user situation, different variables determine how much work is redirected
to the zIIP.
On a z13s server, the following workloads can also benefit from zIIPs:
z/OS Communications Server uses the zIIP for eligible Internet Protocol Security (IPSec)
network encryption workloads. This configuration requires z/OS V1R10 or later releases.
Portions of IPSec processing take advantage of the zIIPs, specifically end-to-end
encryption with IPSec. The IPSec function moves a portion of the processing from the
general-purpose processors to the zIIPs. In addition, to run the encryption processing, the
zIIP also handles the cryptographic validation of message integrity and IPSec header
processing.
z/OS Global Mirror, formerly known as Extended Remote Copy (XRC), uses the zIIP as
well. Most z/OS Data Facility Storage Management Subsystem (DFSMS) system data
mover (SDM) processing that is associated with z/OS Global Mirror can run on the zIIP.
This configuration requires z/OS V1R10 or later releases.
The first IBM user of z/OS XML system services is DB2 V9. For DB2 V9 before the z/OS
XML System Services enhancement, z/OS XML System Services non-validating parsing
was partially directed to zIIPs when used as part of a distributed DB2 request through
DRDA. This enhancement benefits DB2 V9 by making all z/OS XML System Services
non-validating parsing eligible to zIIPs. This configuration is possible when processing is
used as part of any workload that is running in enclave SRB mode.
z/OS Communications Server also allows the HiperSockets Multiple Write operation for
outbound large messages (originating from z/OS) to be run by a zIIP. Application
workloads that are based on XML, HTTP, SOAP, and Java, and traditional file transfer, can
benefit.
For business intelligence, IBM Scalable Architecture for Financial Reporting provides a
high-volume, high performance reporting solution by running many diverse queries in
z/OS batch. It can also be eligible for zIIP.
For more information about zIIP and eligible workloads, see the IBM zIIP website:
http://www.ibm.com/systems/z/hardware/features/ziip/index.html
zIIP installation information
One CP must be installed with or before any zIIP is installed. In z13s servers, the zIIP to CP
ratio is 2:1, which means that up to 12 zIIPs on any specific model x06 can be characterized.
Table 3-1 shows the allowed number of zIIPs for each model.
Table 3-1 Number of zIIPs per model
Model
Maximum zIIPs
108
IBM z13s Technical Guide
N10
0 - 6 0 - 12
N20