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Advanced DBA – Performance Tuning for MUF Part II
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World® ’16 Advanced DBA – Performance Tuning for MUF Part II Kevin Shuma VP, Product Management CA Technologies MAINFRAME AND WORKLOAD AUTOMATION MFX66EB
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2 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Abstract This is a two part session that describes the various techniques used to tune a CA Datacom environment(MUF) for the best possible performance. Included will be discussions on available monitoring tools. The session will cover various techniques to improve performance within the CA Datacom®/DB environments. VP, Product Management CA Technologies Kevin Shuma
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3 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Agenda I TUNED LAST YEAR WHY DO IT AGAIN? UTILIZING THE IBM ZIIP TO IMPROVE TCO SUMMARY REDUCING PHYSICAL IO TO IMPROVE TCO NEW FUNCTIONALITY AVAILABLE IN V15.0 OTHER CONSIDERATIONS 1 2 3 44 5 6
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4 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD I Tuned Last Year Why Do It Again? § Hardware changes –
System z Integrated Information Processor (zIIP) – Increased real memory – Newer faster DASD § Software changes – Exploitation of the hardware – Increased memory capabilities – New faster or less resource intensive functionality How often do I need to tune?
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5 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Many sites mainframe software charges are based on general purpose processor use § Remember this graph ? §
Typical licensing models would charge based on the highest rolling 4 hour average – not the overall average – Highest 4 hour 65.93 MSUs – Average 4 hour 20.14 MSUs
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6 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD UTILIZING THE IBM zIIP to improve TCO
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7 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Utilizing the IBM zIIP § System z Integrated Information Processor (zIIP) –
Hardware costs only – Does not add to MIPs/MSUs – does not affect software licenses – zIIP CPUs run at full speed – no “reduced capacity” CPUs – IBM limit to zIIPs per General Purpose (GP) CPU § Software vendors like CA can code software to use zIIP as long as they stay within a given set of rules – Only certain kinds processing – can not dispatch physical IO – Only code your own – cannot zIIP other parties code Available specialty processer on most z boxes
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8 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD CA Datacom utilizing the IBM zIIP § CA Datacom and zIIP Specialty Engine –
zOS release 12.0 and above will offload MUF GP processing to zIIP – Release 12.0 – offloads ~33% to zIIP – Release 14.0 – offloads ~50% to zIIP – Release 14.01 – offloads ~80%+ to zIIP – Release 15.0 – offloads ~90+ to zIIP Available specialty processer on most z boxes
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9 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD What could zIIP in CA Datacom get me? Assuming that MUF in 25% of the processing on your box Without zIIP Max. MSU 65.93 Avg. MSU
20.14 With r12 zIIP 33% and MUF @ 25% Max. MSU 60.49 Avg. MSU 18.50 With r14 zIIP 50% and MUF @ 25% Max. MSU 57.69 Avg. MSU 17.63
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10 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD What could zIIP in CA Datacom get me? (cont’d) Assuming that MUF in 25% of the processing on your box Without zIIP Max. MSU 65.93 Avg. MSU
20.14 With r14.01 zIIP 85% and MUF @ 25% Max. MSU 51.92 Avg. MSU 15.86 With r15 zIIP 95% and MUF @ 25% Max. MSU 50.27 Avg. MSU 15.86 Straight line savings not typical
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11 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD CA Datacom utilizing the IBM zIIP § Customer on V15.0 –
Our license is based on a 55 MSU highest rolling average – Before r14, we exceeded the 55 MSU 6 out of 12 months incurring significant upcharges on software – Most recent contract 55 MSUs per month § With a special rate to buy “extra 55 MSUs” for the year – After r14.01 and now 15.0, § We have only exceeded 50 MSUs once during a very heavy startup month – We will not use many of the “extra MSUs” this year – Reduces our costs on the mainframe Available specialty processer on most z boxes
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12 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD CA Datacom utilizing the IBM zIIP (cont’d) § Start-up option –
SMPTASK 5,3,3,SRB § Current default is TCB § Code SRB to run SMP tasks as SRBs § Main task runs as TCB (as well as other subtasks) § First two SMP tasks scheduled to run more aggressively § Other SMP tasks scheduled same as when in TCB mode § All SMP tasks are either SRB or TCB Utilizing zIIP in the MUF
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13 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD CA Datacom utilizing the IBM zIIP (cont’d) § Each SRB SMP task paired with a DBSMAPR TCB –
Used for things an SRB can’t do – Or things a zIIP can’t do – Passed back and forth as synchronous requests Utilizing zIIP in the MUF SRB- SMP1 SMA1 SRB- SMP2 SMA2 SRBs TCBs
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14 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD CA Datacom utilizing the IBM zIIP (cont’d) § Example of SRB/TCB pairs Utilizing zIIP in the MUF
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15 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD CA Datacom utilizing the IBM zIIP (cont’d) § Customer example: Large bank –
week of processing – Running V14.01 zIIP with large buffer pools Utilizing zIIP in the MUF
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16 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD CA Datacom utilizing the IBM zIIP (cont’d) § Any technique that reduces IO reduction can improve TCO by swapping GP CPU for zIIP-able CPU –
Using more buffers – Using MRDF covered and virtual data – Reducing IO § Larger block sizes § Use of compression (with zIIP present) § Anything else Final thoughts
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17 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reducing physical IO to improve TCO
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18 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD How to Improve TCO With Datacom – Reduce IO §
Database engines are physical IO consumers § Physical IOs consume significant amounts of CPU § Reduction of Physical IO leads to reduction of CPU consumed – Logical IOs (memory) are cheaper in CPU the physical IO – Logical IOs are zIIP-able (specialty processor eligible) § Remember the bank with 97% zIIP Typically reducing IO will save GP CPU May be processed on zIIP
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19 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Ensure the buffer pools are large enough to provide high logical reuse –
IXX/DXX buffers are 64-bit § Increase each until 5+ reuse “falls off” (increase in reasonable increments) – DATA/DATA2 buffers are 31-bit or 64-bit (V15) § Increase each until 5+ reuse “falls off” (increase in reasonable increments) – If using 31-bit storage (do not allow 31-bit to get exhausted) – Monitor paging to ensure paging remains reasonable Standard buffers
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20 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Implement larger block size for selected data areas –
If in use make sure they are being used efficiently § Larger block size could reduce IO – Increase from 4K to 18K does not significantly affect cost of IO retrieval – The more rows per block, the more opportunity for improved reuse – Need to validate using BVMs § Need to balance DATA/DATA2 buffers to area usage – Increase DATA2 as workload is moved to the large size – If using 31-bit storage, do not allow 31-bit to get exhausted Going to a larger data block size = buffer size
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21 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Like a private buffer pool for a selected area –
Provides a memory cache to avoid IO when requested block is not in a buffer Using MRDF COVERED
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22 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § FIRST uses the least amount of CPU to find a requested block –
Direct mapping (data block 7 is in memory slot 7) – Does not adjust to activity – May not work well if area to be covered is too big § ACTIVE uses more CPU to find a requested block – Adjusts to activity, similar to buffering – LRU is used to determine which memory slots are reused – Indirect mapping (data block 7 may be anywhere in the memory) – Works well if the “working set” of blocks fits within the amount of Covered memory Using MRDF COVERED
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23 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Covering is not a “set-once and forget” process –
Needs reviewing on a monthly basis § Covering allocations can be changed on the fly to match processing needs § Covering should be targeted to high read areas – IXX over DATA if same value § Can be pre-loaded during non-peak processing Using MRDF COVERED
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24 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Review stats below –
some good choices, some bad choices Using MRDF COVERED
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25 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Sample MRDF query Using MRDF COVERED
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26 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Looking for the best areas to cover Using MRDF COVERED
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27 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) Comparison buffers versus MRDF COVERED § Buffers are the most efficient use of memory when sized to match the data, but –
Data buffer pools in v14 are limited due to 31-bit – Buffers are reused base on LRU (Least Recently Used) – A very active batch report against a non-essential table could flush a large portion of the active buffer pool § COVERED areas – Are 64-bit by default – Covered blocks are specific to a given area and are not flushed by non associated activity, but § COVERED areas must still funnel their blocks back through the buffer pools § Covering low activity areas uses the same space that high activity areas uses
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28 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Build buffer pools to a reasonable size to support typical “peak activity” within the system §
Use Covering to target key high-use (read) datasets § Always measure every change to make sure it presents business value!!! Best Choice – Use both large buffer pools and selective covering
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29 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § Implement compression –
Compression reduces the row image so more rows per block – Reduces DASD utilization (reduces cost) – Can improve buffer reuse – Can improve COVERED efficiency § DB compression runs in MUF and is zIIP eligible – With zIIP processors, the compression CPU costs are shifted to less costly CPU devices Using Compression
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30 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Reduce IO (cont’d) § An option that once was considered outdated –
DASD cheap – CPU Expensive § May now be back in style – DASD is cheap but zIIP Cheaper – Always measure with BVMs!! – New cool option in 14.02 § Online compress § See session MFX94S - Reducing TCO with Datacom Compression (Presspack) Using Compression
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31 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD New functionality available in V15.0
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32 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD New functionality available in V15 § Data buffer pools now go to 64-bit –
Reduced 31-bit consumption – Ability to create larger (or more) buffer pools § Can be combined with additional buffer pools to build tailored buffer pools that resemble COVERED areas – Tailored buffer pools would have some advantage over covered areas – No requirement to move “through” a buffer pool like COVERED – Buffer LRU processing is highly efficient § Which is better - verdict is still out Data pools now in 64 bit
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33 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD New functionality available in V15 (cont’d) § Are you seeing lots of “other SRB” with zIIP –
Example MUF with medium buffers and lots of IO activity (V14) Improved zIIP utilization with reduced GP CPU Cmd Jobname Jobnr Clocktime CPU-Time SRB-Time IOCount CPTime IIPtime IIPonCP IIPencl ___ SHUKE01 59656 00:10:33 2.473518 0.020703 1062 2.432321 0.041197 0.000037 0.041197 ___ @2DBRUP2 59696 00:00:53 0.134624 0.023081 109 0.134624 ___ QA14MUF4 59663 00:08:14 5.667642 1.258595 70677 3.145144 2.522497 0.000524 2.522497 ___ @3PWRUP2 59700 00:00:46 0.099999 0.017140 109 0.099999 ___ @1UNRED1 59686 00:01:06 0.387458 0.079477 109 0.387458 ___ @3PWRUP3 59701 00:00:51 0.130862 0.023287 109 0.130862 ___ @2DBRUP1 59695 00:00:53 0.372552 0.063932 109 0.372552 ___ @2DBRUP3 59697 00:00:53 0.138674 0.024207 109 0.138674 ___ @1UNRED2 59687 00:00:56 0.103296 0.019699 109 0.103296 Total CPU 5.667642 zIIP CPU 2.522497 45% Billable CPU 3.145145 55% GP CPU 1.886550 33% Other SRB 1.258595 22%
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34 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD New functionality available in V15 (cont’d) § Are you seeing lots of “other SRB” with zIIP –
Using JARS to capture other SRB § zIIP SRB is not reported since it does not run on a GP CPU Improved zIIP utilization with reduced GP CPU Other SRB
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35 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD New functionality available in V15 (cont’d) § V15 reduces “other SRB” with zIIP –
Example MUF with medium buffers and lots of IO activity (V15) Improved zIIP utilization with reduced GP CPU Total CPU 5.581476 zIIP CPU 4.248196 76% Billable CPU 1.333280 24% GP CPU 0.967602 17% Other SRB 0.365678 07% Cmd Jobname Jobnr Clocktime CPU-Time SRB-Time IOCount CPTime IIPtime IIPonCP IIPencl ___ SHUKE01 59656 00:54:02 5.729934 0.053566 2102 5.240694 0.489240 0.000089 0.489240 ___ @2DBRUP2 60326 00:00:52 0.307367 0.051069 109 0.307367 ___ QA14MUF4 60316 00:01:10 5.581476 0.365678 152683 1.333339 4.248196 0.000026 4.248196 ___ @3PWRUP2 60323 00:01:05 0.264024 0.044803 109 0.264024 ___ @1UNRED1 60325 00:00:52 0.432173 0.066993 109 0.432173 ___ @3PWRUP3 60331 00:00:45 0.181963 0.028822 109 0.181963 ___ @2DBRUP1 60318 00:01:05 0.426242 0.072268 110 0.426242 ___ @2DBRUP3 60330 00:00:51 0.300624 0.045925 109 0.300624 ___ @1UNRED2 60317 00:01:10 0.532060 0.088708 109 0.532060
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36 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD New functionality available in V15 (cont’d) § V15 reduces “other SRB” with zIIP –
Example MUF with medium buffers and lots of IO activity (V15) Improved zIIP utilization with reduced GP CPU Other SRB
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37 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD New functionality available in V15 (cont’d) New data provided in MUF EOJ and ALL_INFO_REPORT Limited version of reduced “other-SRB” available for users in V14.02
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38 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Other considerations
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39 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Other considerations § Other considerations –
Are you wasting CPU cycles § Are you checking out – Application errors (DB RCs or SQLCODEs) – PXX dump activity – Accounting activity – CBS temp indexes – SQL temp tables – Sequential read ahead Things you need to check
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40 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Other considerations § Other considerations –
Checking your activity snapshots § Look for different/increasing statistics – Check your DBMSTLST assembly § Make sure you are proving the maximum buffers to DBUTLTY § Need to change data buffer sizes if you change block sizes Things you need to check
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41 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Summary A Few Words to Review Results – Part I and II Improving performance and reducing TCO can be accomplished in many ways within CA Datacom The top techniques revolve around: Move CPU consumption to inexpensive specialty processors Reducing IO by using buffering and covering to maximize memory use Reducing activities that consume CPU without benefit Programs that get “bad return codes” as a normal mode of operation Building temporary tables or indexes Etc.
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@CAWORLD #CAWORLD © 2016 CA. All RIGHTS RESERVED.42 @CAWORLD #CAWORLD
© 2016 CA. All RIGHTS RESERVED.42 Mainframe and Workload Automation For more information on Mainframe and Workload Automation, please visit: http://cainc.to/9GQ2JI
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43 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Recommended Sessions SESSION # TITLE
DATE/TIME MFX92S Strategy and Vision for CA Datacom and CA Ideal 11/16/2016 at 12:45 pm MFX93S What’s new in CA Datacom 11/16/2016 at 1:45 pm MFX94S Reducing TCO with Datacom Compression (Presspack) 11/16/2016 at 3:00 pm MFX95SA Modernizing the CA Datacom data – SQL Access Part I 11/16/2016 at 3:45 pm MFX95SB Modernizing the CA Datacom data – SQL Access Part II 11/16/2016 at 4:30 pm MFX96S CA Datacom/AD Installation/Upgrade and Maintenance 11/17/2016 at 12:45 pm MFX97S CA Datacom/AD Report Utilization, and information gather for Support 11/17/2016 at 1:45 pm MFX98S Using Sysview to monitor and measure your CA Datacom environment – AD and DB 11/17/2016 at 3:00 pm MFX99S Birds of a Feather/Stump the Techie! 11/17/2016 at 3:45 pm
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44 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Questions?
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45 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD Thank you. Stay connected at communities.ca.com
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46 © 2016 CA. ALL RIGHTS RESERVED.@CAWORLD #CAWORLD © 2016 CA. All rights reserved. All trademarks referenced herein belong to their respective companies. The content provided in this CA World 2016 presentation is intended for informational purposes only and does not form any type of warranty.
The information provided by a CA partner and/or CA customer has not been reviewed for accuracy by CA. For Informational Purposes Only Terms of this Presentation
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