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Db2 10 memory management uk db2 user group june 2013 [read-only]

Laura Hood, profile picture
Laura Hood

DB2 10 provides significant enhancements to memory management that allow for much greater scalability. Key changes include moving most objects above the 2GB bar, enabling larger buffer pools through 1MB page support, and enhanced real storage monitoring. Migrating to DB2 10 requires ensuring sufficient real storage is available, monitoring real storage usage, and addressing other limiting factors before taking advantage of new features to further scale vertically.

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The Information Management Specialists Memory Management in DB2 10 for z/OS Julian Stuhler UK DB2 GUIDE Meeting, June 2013
The Information Management Specialists Acknowledgements • John Campbell • Michael Dewert • James Gill
The Information Management Specialists Agenda • Introduction • What’s Changed & Why? • What Does It Mean for Me? • Summary & Questions Win a limited edition 30th Anniversary DB2 Geek T-Shirt for asking me a question!
The Information Management Specialists Introduction • Julian Stuhler Director and Principal Consultant at Triton Consulting 25 years DB2 experience, 20 as a consultant working with customers in UK, Europe and the US IBM Gold Consultant since 1999 IBM Information Champion IDUG Past President Author of IBM Redbooks, white papers and more recently “flashbooks” Designer of IBM’s DB2 10 Business Value Assessment Estimator Tool
The Information Management Specialists What’s Changed and Why? The Need for Scalability
The Information Management Specialists The Need for Scalability • IT volumes continue to increase More applications More data More transactions • Performance is ever more important Customers need to support workload growth without a drop-off in performance • Availability is ever more important Pressure to reduce both planned and unplanned outages • End result: each DB2 environment is being asked to work harder, with less downtime • Every DB2 release attempts to push back these boundaries, but major progress has been made in DB2 10
The Information Management Specialists DB2 Storage Usage – DBM1 storage below the bar 0 231 (2GB) 232 (4GB) “The Bar” 224 (16MB) “The Line” Typically 800 – 1900 MB Available to DB2 Typically 7 – 9 MB Available to DB2
The Information Management Specialists Virtual Storage Enhancements • V8 began a major project to transform DB2 into a 64-bit RDBMS Laid the groundwork and provided some scalability improvements but a lot of DBM1 objects remained below the 2GB bar • DB2 9 improved things a little, but only by another 10-15% for most customers Practical limit of 300-500 threads per DB2 subsystem • DB2 10 moves 80-90% of the remaining objects above the bar, resulting in 5-10x improvement in threads per subsystem (CM)
The Information Management Specialists Virtual Storage Enhancements All storage EDMPool Thread Storage Dataset Storage Castout buffers Compression Dict DBD Cache Global DSC RIDPOOL SORTPOOL CT + PT Thread Storage Dataset Storage Castout buffers Compression Dict DBD Cache Global DSC RIDPOOL SORTPOOL SKCT + PT (Pointers) Dataset Storage Castout buffers Compression Dict DBD Cache Global DSC RIDPOOL SORTPOOL SKCT + PT CT + PT Thread V7 V8 V9 V10
The Information Management Specialists Real Storage Enhancements • For prior releases, z/OS always managed DB2 bufferpool pages as 4K frames • Move to 64-bit architecture made much larger buffer pools viable Bufferpools can use many millions of pages Increased z/OS overheads for page management DB2 9 Buffer Pool z/OS Storage 4K Pages 4K Pages
The Information Management Specialists Real Storage Enhancements • DB2 10 introduces support for 1MB pages to reduce z/OS page management overheads Needs z10/z196/zEC12 server Needs bufferpool to be defined with PGFIX=YES z/OS sysprogs must partition real storage between 4K and 1MB frames (IESYSnn in PARMLIB, needs IPL) so wait until DB2 10 is bedded in • Key part of potential DB2 10 CPU reduction Customer testing during beta program showed CPU reductions of 0-6% with this feature enabled DB2 10 Buffer Pool z/OS Storage 4K Pages 1MB Pages
The Information Management Specialists What Does It Mean For Me?
The Information Management Specialists Real Storage Availability • DB2 10 removes most virtual storage constraints, but you need sufficient real storage to back any increased virtual storage usage Paging will still kill you in a 64-bit environment, should be near zero • Plan on additional 10-30% real memory for DB2 following migration from DB2 9 Most customers will be at lower end of this range, but more will be required once you start using some DB2 10 capabilities. Skip migration customers will need more
The Information Management Specialists Real Storage Availability • Insufficient real storage to back usage of virtual leads to paging activity • It is critical to ensure that page-in activity (aka “demand paging”) for DB2 address spaces is minimised (near zero) No expanded storage in 64-bit environment, all paging is to disk (AUX) Any page-in operation is very expensive in performance terms compared to page hit in real storage Note that page-out operations are normal for rarely-used pages and not usually a cause for concern • Real storage shortages can have serious impact on stability of overall system If all AUX is consumed, LPAR goes into wait state and may fail Can lead to long system dump processing times, with high risk of system-wide slowdowns and incomplete dumps
The Information Management Specialists Real Storage Availability • You also need to allow approx. 16GB for DB2 dump requirement (twice the 8GB value recommended for DB2 8 and 9) MAXSPACE parameter defines max amount of virtual storage for SVC dump – z/OS default is 500MB Some customer horror stories due to insufficient storage being available for dumps • Good news if you’re on a z196, as the “technology dividend” means that cost per GB is around 75% less than for a z10 Cheaper still for zEC12 • Many customers are already running lean on real storage even under V9, and are building real storage increase costs into their DB2 10 financial justifications
The Information Management Specialists Real Storage Monitoring • Statistics IFCID 225 has long been vital for DB2 storage monitoring Part of Statistics Class 1 trace since PQ99658, so now enabled by default • Once DB2 10 is implemented in your environment, focus should change from virtual to real storage monitoring • PM24723 and PM37647 introduce important real storage monitoring and contraction enhancements ICFID 225 enhanced with new fields to externalise real and auxiliary storage consumption for storage objects in private, shared, and common areas above the bar (see additional information at end of presentation) Introduces two new DSNZPARMs to tell DB2 if and how to release any unused real storage (REALSTORAGE_MANAGEMENT) and specify upper limit on DB2 real storage usage (REALSTORAGE_MAX) – see next slide Some increase in MSTR CPU due to storage monitoring. Make sure PTFs for z/OS APAR OA37821 and corresponding DB2 APAR PM49816 are also applied – see later
The Information Management Specialists Real Storage Monitoring • Opaque DSNZPARMs introduced by PM24723 and PM37647 • REALSTORAGE_MANAGEMENT ON – Unused backed real frames discarded when possible (CPU overhead) OFF – DB2 will only discard unused frames when critical real storage or auxiliary storage usage is detected AUTO (default) – DB2 will discard unused frames when the system begins to page Recommended value = AUTO DSNV516I and DSNV517I written when DB2 enters and exits real storage contraction mode • REALSTORAGE_MAX Hard limit on real and auxiliary storage used by DB2 subsystem – DB2 will terminate if limit reached Valid values: NOLIMIT (default), 1 – 65,535 (GB) Recommended value = 2 x amount of real and auxiliary storage that the subsystem might reasonably consume DSNS003I written when DB2 approaches the threshold and DSNS004I written to indicate relief from this condition
The Information Management Specialists Real Storage – Other Issues • Ensure PTFs for z/OS APAR APAR OA37821 and corresponding DB2 APAR PM49816 are applied Fixes MSTR CPU issue associated with MVS COUNTPAGES function used for real storage monitoring (introduced by our good friend PM24723) Especially noticable where more than one DB2 subsystem resides on same LPAR,or on an idle system Needs IPL to implement z/OS fix Both APARs marked as HIPER – you are strongly advised to implement the associated PTFs before migrating to DB2 10 in any production environments • What about CONTSTOR and MINSTOR? Enabling these ZPARMs in previous releases allowed you to spend a little more CPU in exchange for improved virtual storage utilisation Both ZPARMs apply to 31-bit storage only, so are less important in DB2 10 Recommendation is CONTSTOR=MINSTOR=NO once you have proven VSCR in DB2 10
The Information Management Specialists Other Limiting Factors • DBM1 Virtual Storage should no longer be an issue, but other limiting factors on vertical scalability still remain ESQA/ECSA (31-bit) storage Active log write contention (LC19) SMF volumes (DB2 10 SMF compression can help)
The Information Management Specialists Use New DB2 10 Features • Only consider use of new features when you are sure you have fully considered all the previous items and DB2 10 is properly “bedded in” • Remember that some VSCR enhancements are available in CM, but you need package rebind to get maximum benefits
The Information Management Specialists Use New DB2 10 Features • Exploit 1MB real storage frames Needs PGFIX=YES, but many customers still haven’t exploited this feature in their DB2 8 and DB2 9 systems despite significant potential CPU savings (up to 6% seen) PGFIX=YES benefits dependent on I/O rate, and you need to back pools 100% with real storage (scary if you’re already running lean on real storage availability) 1MB page frames specified by LFAREA in IEASYSnn parmlib member, and need IPL to implement ► Use /DISPLAY VIRTSTOR,LFAREA after implementation to ensure sizing is OK, as conversion between 4K and 1MB frames costs CPU Ensure you are up to date on z/OS maintenance before enabling
The Information Management Specialists DB2 10 Real Storage Enhancements • 1MB page frame support for buffer pools CPU savings of up to 4% by reducing z/OS page management overheads for big BPs ► DB2 BPs can be up to 1TB total in DB2 9 and 10, with limit of 2x available real storage z/OS sysprogs must partition real storage between 4K and 1MB frames ► LFAREA parm in IEASYSnn PARMLIB (expressed in %, MB or GB, 80% max) ► Need IPL to change LFAREA, so ensure DB2 10 is properly “bedded in” before implementing!
The Information Management Specialists DB2 10 Real Storage Enhancements • z/OS can decompose 1MB pages into 256 x 4KB pages, or recombine 4KB pages into 1MB pages if SOS condition occurs Costs CPU and elapsed time so should be avoided by setting LFAREA appropriately LFAREA Decompose / recombine
The Information Management Specialists Tuning – Setting LFAREA • Sizing guideline Review BPs and set PGFIX=YES where suitable ► Ensure sufficient real storage to back BP ► See BP tuning section earlier Set LFAREA = SUM (page-fixed BPs) + 10% ► Assumes DB2 is only major user of 1MB page frames, but allows 10% “wriggle room” Verify sizing is correct (after IPL and DB2 BP allocation!) ► /DISPLAY VIRTSTOR,LFAREA (no decomposition) ► -DIS BUFFERPOOL(nn) SERVICE=4 (no 4K pages used for page-fixed buffer pools) • Review LFAREA whenever BP sizes, page-fix attribute etc is changed Sysprogs and DBAs must co-ordinate activities (should be BAU!)
The Information Management Specialists Real Storage Monitoring • Monitor use of 1MB page frames used by a specific BP -DISPLAY BUFFERPOOL(BPnn) SERVICE=4 Resultant DSNB999I message shows number of 1MB pages in use ----DBA1 DIS BUFFERPOOL(BP0) SERVICE=4DBA1 DIS BUFFERPOOL(BP0) SERVICE=4DBA1 DIS BUFFERPOOL(BP0) SERVICE=4DBA1 DIS BUFFERPOOL(BP0) SERVICE=4 DSNB401I -DBA1 BUFFERPOOL NAME BP0, BUFFERPOOL ID 0, USE COUNT 246 DSNB402I -DBA1 BUFFER POOL SIZE = 5000 BUFFERS AUTOSIZE = NO 641 ALLOCATED = 5000 TO BE DELETED = 0 IN-USE/UPDATED = 172 DSNB406I -DBA1 PGFIX ATTRIBUTE - 642 CURRENT = NO PENDING = NO PAGE STEALING METHOD = LRU DSNB404I -DBA1 THRESHOLDS - 643 VP SEQUENTIAL = 80 DEFERRED WRITE = 30 VERTICAL DEFERRED WRT = 5, 0 PARALLEL SEQUENTIAL =50 ASSISTING PARALLEL SEQT= 0 DSNB999I -DBA1 DSNB1DBP SERVICE( 4 )OUTPUT DSNB999I -DBA1 4K PAGES 5000 DSNB999I -DBA1 1M PAGES 0 DSN9022I -DBA1 DSNB1CMD '-DIS BUFFERPOOL' NORMAL COMPLETION
The Information Management Specialists Real Storage Monitoring • Monitor use of 1MB page frames across LPAR /DISPLAY VIRTSTOR,LFAREA (needs APAR OA31116) IAR019I message shows breakdown of 4KB and 1MB page frames and how much of each is currently available HWM usage is also shown – useful for ensuring correct segmentation of 4K and 1MB pages in z/OS /DISPLAY VIRTSTOR,LFAREA IAR019I 12.31.04 DISPLAY VIRTSTOR SOURCE = GS TOTAL LFAREA = 1024M LFAREA AVAILABLE = 1023M LFAREA ALLOCATED (1M) = 10M LFAREA ALLOCATED (4K) = 2M MAX LFAREA ALLOCATED (1M) = 10M MAX LFAREA ALLOCATED (4K) = 2M Current / HWM LFAREA allocated for 4KB pages (pages decomposed)
The Information Management Specialists Use New DB2 10 Features • Possibility for less DB2 subsystems (and possibly less LPARs) in a data sharing environment Lower data sharing overhead Less systems to manage / maintain Minimum of 4 members / 2 LPARs still recommended for high availability
The Information Management Specialists Use New DB2 10 Features • More space for performance critical storage objects such as dynamic statement cache Improve DSC hit ratio and reduce CPU accordingly Potential for significant MAXKEEPD increase is a key part of the overall DB2 10 value proposition for SAP customers • Potential to reduce CPU cost through more use of persistent threads with RELEASE(DEALLOCATE) CICS protected entry threads DB2 10 High-Performance DBATs Remember trade-off on BIND/DDL concurrency with use of RELEASE(DEALLOCATE) • Don’t forget that you’ll need to allocate additional real storage to back any increases above!
The Information Management Specialists The Future • IBM announced zEnterprise EC12 in August 2012 12th generation processor, running at 5.5GHz Up to 101 configurable processors per server Flash express – up to 6.4TB of SSD as a new memory tier between RAIM and disk • Several new memory-related features planned DB2 code backed by 1MB page frames Pageable 1MB page frames (no need for PGFIX=YES) Support for (non pageable) 2GB page frames Support for Flash express • IBM statement of direction for DB2 exploitation of these features in a future release ☺
The Information Management Specialists Summary & Questions
The Information Management Specialists Summary • Make sure you have enough real storage before upgrading to DB2 10 • Change your focus from monitoring virtual storage to monitoring real storage • If you are scaling vertically or consolidating subsystems, be aware of other limiting factors that were previously invisible but may now come to bite you • Once you’ve addressed ALL of the above, start to make use of the new DB2 10 storage-related features Remember to add more real storage as required in order to prevent paging
The Information Management Specialists Feedback / Questions Julian Stuhler – julian.stuhler@triton.co.uk Triton Consulting 25 Bank Plain Norwich NR2 4SF www.triton.co.uk
The Information Management Specialists Additional Information
The Information Management Specialists Real Storage Monitoring – New IFCID 225 Counters ADDRESS SPACE SUMMARYADDRESS SPACE SUMMARYADDRESS SPACE SUMMARYADDRESS SPACE SUMMARY –––– DBM1DBM1DBM1DBM1 EXTENDED REGION SIZE (MAX) : 1587544064 24EXTENDED REGION SIZE (MAX) : 1587544064 24EXTENDED REGION SIZE (MAX) : 1587544064 24EXTENDED REGION SIZE (MAX) : 1587544064 24----BIT LOW PRIVATE : 221184BIT LOW PRIVATE : 221184BIT LOW PRIVATE : 221184BIT LOW PRIVATE : 221184 24242424----BIT HIGH PRIVATE : 450560 31BIT HIGH PRIVATE : 450560 31BIT HIGH PRIVATE : 450560 31BIT HIGH PRIVATE : 450560 31----BIT EXTENDED LOW PRIVATE : 69603328BIT EXTENDED LOW PRIVATE : 69603328BIT EXTENDED LOW PRIVATE : 69603328BIT EXTENDED LOW PRIVATE : 69603328 31313131----BIT EXTENDED HIGH PRIVATE : 38600704 CURR HIGH ADDR 24BIT EXTENDED HIGH PRIVATE : 38600704 CURR HIGH ADDR 24BIT EXTENDED HIGH PRIVATE : 38600704 CURR HIGH ADDR 24BIT EXTENDED HIGH PRIVATE : 38600704 CURR HIGH ADDR 24----BIT PRIV REGION : X’0003C000’BIT PRIV REGION : X’0003C000’BIT PRIV REGION : X’0003C000’BIT PRIV REGION : X’0003C000’ CURR HIGH ADDR 31CURR HIGH ADDR 31CURR HIGH ADDR 31CURR HIGH ADDR 31----BIT PRIV REGION : X’270E9000’ 31BIT PRIV REGION : X’270E9000’ 31BIT PRIV REGION : X’270E9000’ 31BIT PRIV REGION : X’270E9000’ 31----BIT RESERVED FOR MUST COMPLETE : 158754406BIT RESERVED FOR MUST COMPLETE : 158754406BIT RESERVED FOR MUST COMPLETE : 158754406BIT RESERVED FOR MUST COMPLETE : 158754406 31313131----BIT RESERVED FOR MVS : 25827760 STORAGE CUSHION WARNING TO CONTRACT: 158754406BIT RESERVED FOR MVS : 25827760 STORAGE CUSHION WARNING TO CONTRACT: 158754406BIT RESERVED FOR MVS : 25827760 STORAGE CUSHION WARNING TO CONTRACT: 158754406BIT RESERVED FOR MVS : 25827760 STORAGE CUSHION WARNING TO CONTRACT: 158754406 TOTAL 31TOTAL 31TOTAL 31TOTAL 31----BIT GETMAINED STACK : 4341760 TOTAL 31BIT GETMAINED STACK : 4341760 TOTAL 31BIT GETMAINED STACK : 4341760 TOTAL 31BIT GETMAINED STACK : 4341760 TOTAL 31----BIT STACK IN USE : 3997696BIT STACK IN USE : 3997696BIT STACK IN USE : 3997696BIT STACK IN USE : 3997696 TOTAL 31TOTAL 31TOTAL 31TOTAL 31----BIT VARIABLE POOL : 12836864 TOTAL 31BIT VARIABLE POOL : 12836864 TOTAL 31BIT VARIABLE POOL : 12836864 TOTAL 31BIT VARIABLE POOL : 12836864 TOTAL 31----BIT FIXED POOL : 86016BIT FIXED POOL : 86016BIT FIXED POOL : 86016BIT FIXED POOL : 86016 TOTAL 31TOTAL 31TOTAL 31TOTAL 31----BIT GETMAINED : 1002384 AMOUNT OF AVAILABLE 31BIT GETMAINED : 1002384 AMOUNT OF AVAILABLE 31BIT GETMAINED : 1002384 AMOUNT OF AVAILABLE 31BIT GETMAINED : 1002384 AMOUNT OF AVAILABLE 31----BIT : 1479335936BIT : 1479335936BIT : 1479335936BIT : 1479335936 SYSTEM AGENT STACK STORAGE IN USE : 1234567SYSTEM AGENT STACK STORAGE IN USE : 1234567SYSTEM AGENT STACK STORAGE IN USE : 1234567SYSTEM AGENT STACK STORAGE IN USE : 1234567 TOTAL 64TOTAL 64TOTAL 64TOTAL 64----BIT VARIABLE POOL : 10162176 TOTAL 64BIT VARIABLE POOL : 10162176 TOTAL 64BIT VARIABLE POOL : 10162176 TOTAL 64BIT VARIABLE POOL : 10162176 TOTAL 64----BIT FIXED : 7503872BIT FIXED : 7503872BIT FIXED : 7503872BIT FIXED : 7503872 TOTAL 64TOTAL 64TOTAL 64TOTAL 64----BIT GETMAINED : 438127168 TOTAL 64BIT GETMAINED : 438127168 TOTAL 64BIT GETMAINED : 438127168 TOTAL 64BIT GETMAINED : 438127168 TOTAL 64----BIT PRIVATE FOR STOR MANAG: 1925120BIT PRIVATE FOR STOR MANAG: 1925120BIT PRIVATE FOR STOR MANAG: 1925120BIT PRIVATE FOR STOR MANAG: 1925120 REAL 4K FRAMES IN USE : 20577 AUXILIARY SLOTS IN USE : 41227REAL 4K FRAMES IN USE : 20577 AUXILIARY SLOTS IN USE : 41227REAL 4K FRAMES IN USE : 20577 AUXILIARY SLOTS IN USE : 41227REAL 4K FRAMES IN USE : 20577 AUXILIARY SLOTS IN USE : 41227 64646464----BIT REAL 4K FRAMES IN USE : 12129 64BIT REAL 4K FRAMES IN USE : 12129 64BIT REAL 4K FRAMES IN USE : 12129 64BIT REAL 4K FRAMES IN USE : 12129 64----BIT 4K AUX SLOTS IN USE : 27055BIT 4K AUX SLOTS IN USE : 27055BIT 4K AUX SLOTS IN USE : 27055BIT 4K AUX SLOTS IN USE : 27055 ABOVE VALUE W/O BP STORAGE : 10000 ABOVE VALUE W/O BP STORAGE : 4096ABOVE VALUE W/O BP STORAGE : 10000 ABOVE VALUE W/O BP STORAGE : 4096ABOVE VALUE W/O BP STORAGE : 10000 ABOVE VALUE W/O BP STORAGE : 4096ABOVE VALUE W/O BP STORAGE : 10000 ABOVE VALUE W/O BP STORAGE : 4096 HWM 64HWM 64HWM 64HWM 64----BIT REAL 4K FRAMES IN USE : 43047 HWM 64BIT REAL 4K FRAMES IN USE : 43047 HWM 64BIT REAL 4K FRAMES IN USE : 43047 HWM 64BIT REAL 4K FRAMES IN USE : 43047 HWM 64----BIT AUX SLOTS IN USE : 27059BIT AUX SLOTS IN USE : 27059BIT AUX SLOTS IN USE : 27059BIT AUX SLOTS IN USE : 27059 QW0225CTLP (S) : OFF QW0225CTLS (S) : OFFQW0225CTLP (S) : OFF QW0225CTLS (S) : OFFQW0225CTLP (S) : OFF QW0225CTLS (S) : OFFQW0225CTLP (S) : OFF QW0225CTLS (S) : OFF
The Information Management Specialists Real Storage Monitoring – New IFCID 225 Counters SHARED/COMMON STORAGE SUMMARYSHARED/COMMON STORAGE SUMMARYSHARED/COMMON STORAGE SUMMARYSHARED/COMMON STORAGE SUMMARY EXTENDED CSA SIZE : 315179008 31EXTENDED CSA SIZE : 315179008 31EXTENDED CSA SIZE : 315179008 31EXTENDED CSA SIZE : 315179008 31----BIT COMMON FIXED POOL : 1122304BIT COMMON FIXED POOL : 1122304BIT COMMON FIXED POOL : 1122304BIT COMMON FIXED POOL : 1122304 31313131----BIT COMMON VARIABLE POOL : 716800 31BIT COMMON VARIABLE POOL : 716800 31BIT COMMON VARIABLE POOL : 716800 31BIT COMMON VARIABLE POOL : 716800 31----BIT COMMON GETMAINED : 79661BIT COMMON GETMAINED : 79661BIT COMMON GETMAINED : 79661BIT COMMON GETMAINED : 79661 64646464----BIT COMMON FIXED POOL : 3641344 64BIT COMMON FIXED POOL : 3641344 64BIT COMMON FIXED POOL : 3641344 64BIT COMMON FIXED POOL : 3641344 64----BIT COMMON VARIABLE POOL : 37748736BIT COMMON VARIABLE POOL : 37748736BIT COMMON VARIABLE POOL : 37748736BIT COMMON VARIABLE POOL : 37748736 64646464----BIT COMMON GETMAINED : 0 64BIT COMMON GETMAINED : 0 64BIT COMMON GETMAINED : 0 64BIT COMMON GETMAINED : 0 64----BIT COMMON FOR STOR MANAG : 1400832BIT COMMON FOR STOR MANAG : 1400832BIT COMMON FOR STOR MANAG : 1400832BIT COMMON FOR STOR MANAG : 1400832 64646464----BIT SHARED VARIABLE POOL : 13545472 64BIT SHARED VARIABLE POOL : 13545472 64BIT SHARED VARIABLE POOL : 13545472 64BIT SHARED VARIABLE POOL : 13545472 64----BIT SHARED FIXED : 3129344BIT SHARED FIXED : 3129344BIT SHARED FIXED : 3129344BIT SHARED FIXED : 3129344 64646464----BIT SHARED GETMAINED : 4220208 64BIT SHARED GETMAINED : 4220208 64BIT SHARED GETMAINED : 4220208 64BIT SHARED GETMAINED : 4220208 64----BIT SHARED FOR STOR MANAG : 2056192BIT SHARED FOR STOR MANAG : 2056192BIT SHARED FOR STOR MANAG : 2056192BIT SHARED FOR STOR MANAG : 2056192 64646464----BIT SHR SYSTEM AGENT STACK (AS) : 268435456 64BIT SHR SYSTEM AGENT STACK (AS) : 268435456 64BIT SHR SYSTEM AGENT STACK (AS) : 268435456 64BIT SHR SYSTEM AGENT STACK (AS) : 268435456 64----BIT SHR SYSTEM AS IN USE : 33554432BIT SHR SYSTEM AS IN USE : 33554432BIT SHR SYSTEM AS IN USE : 33554432BIT SHR SYSTEM AS IN USE : 33554432 64646464----BIT SHR NONBIT SHR NONBIT SHR NONBIT SHR NON----SYSTEM AS : 805306368 64SYSTEM AS : 805306368 64SYSTEM AS : 805306368 64SYSTEM AS : 805306368 64----BIT SHR NONBIT SHR NONBIT SHR NONBIT SHR NON----SYSTEM AS IN USE : 1048576SYSTEM AS IN USE : 1048576SYSTEM AS IN USE : 1048576SYSTEM AS IN USE : 1048576 SHARED MEMORY OBJECTS : 5SHARED MEMORY OBJECTS : 5SHARED MEMORY OBJECTS : 5SHARED MEMORY OBJECTS : 5 64646464----BIT SHARED MEMORY PAGES : 117440512 HWM 64BIT SHARED MEMORY PAGES : 117440512 HWM 64BIT SHARED MEMORY PAGES : 117440512 HWM 64BIT SHARED MEMORY PAGES : 117440512 HWM 64----BIT SHARED BYTES : 481036337152BIT SHARED BYTES : 481036337152BIT SHARED BYTES : 481036337152BIT SHARED BYTES : 481036337152 64646464----BIT SHARED PAGES BACKED IN REAL : 9395 AUX SLOTS USED FOR 64BIT SHARED PAGES BACKED IN REAL : 9395 AUX SLOTS USED FOR 64BIT SHARED PAGES BACKED IN REAL : 9395 AUX SLOTS USED FOR 64BIT SHARED PAGES BACKED IN REAL : 9395 AUX SLOTS USED FOR 64----BIT SHARED : 5385BIT SHARED : 5385BIT SHARED : 5385BIT SHARED : 5385 64646464----BIT PAGES PAGED IN FROM AUX STO : 5317 64BIT PAGES PAGED IN FROM AUX STO : 5317 64BIT PAGES PAGED IN FROM AUX STO : 5317 64BIT PAGES PAGED IN FROM AUX STO : 5317 64----BIT PAGES PAGED OUT TO AUX STO : 41577BIT PAGES PAGED OUT TO AUX STO : 41577BIT PAGES PAGED OUT TO AUX STO : 41577BIT PAGES PAGED OUT TO AUX STO : 41577 64646464----BIT SHR STG REAL 4K FRMS IN USE : 12344459 64BIT SHR STG REAL 4K FRMS IN USE : 12344459 64BIT SHR STG REAL 4K FRMS IN USE : 12344459 64BIT SHR STG REAL 4K FRMS IN USE : 12344459 64----BIT SHR STG 4K AUX SLTS IN USE : 512BIT SHR STG 4K AUX SLTS IN USE : 512BIT SHR STG 4K AUX SLTS IN USE : 512BIT SHR STG 4K AUX SLTS IN USE : 512 64646464----BIT STK STG REAL 4K FRMS IN USE : 12345789 64BIT STK STG REAL 4K FRMS IN USE : 12345789 64BIT STK STG REAL 4K FRMS IN USE : 12345789 64BIT STK STG REAL 4K FRMS IN USE : 12345789 64----BIT STK STG 4K AUX SLTS IN USE : 256BIT STK STG 4K AUX SLTS IN USE : 256BIT STK STG 4K AUX SLTS IN USE : 256BIT STK STG 4K AUX SLTS IN USE : 256 64646464----BIT COM STG REAL 4K FRMS IN USE : 12345123456789 64BIT COM STG REAL 4K FRMS IN USE : 12345123456789 64BIT COM STG REAL 4K FRMS IN USE : 12345123456789 64BIT COM STG REAL 4K FRMS IN USE : 12345123456789 64----BIT COM STG 4K AUX SLTS IN USE : 1234555555BIT COM STG 4K AUX SLTS IN USE : 1234555555BIT COM STG 4K AUX SLTS IN USE : 1234555555BIT COM STG 4K AUX SLTS IN USE : 1234555555 SERVICE INFORMATION:SERVICE INFORMATION:SERVICE INFORMATION:SERVICE INFORMATION: QW0225_WARN : 0 QW0225_REALAVAIL : 0QW0225_WARN : 0 QW0225_REALAVAIL : 0QW0225_WARN : 0 QW0225_REALAVAIL : 0QW0225_WARN : 0 QW0225_REALAVAIL : 0 QW0225_REALAVAILLO : 0 QW0225_REALAVAILOK : 0QW0225_REALAVAILLO : 0 QW0225_REALAVAILOK : 0QW0225_REALAVAILLO : 0 QW0225_REALAVAILOK : 0QW0225_REALAVAILLO : 0 QW0225_REALAVAILOK : 0 QW0225_ESQAS : 0 QW0225_ESQA_ALLOC : 0QW0225_ESQAS : 0 QW0225_ESQA_ALLOC : 0QW0225_ESQAS : 0 QW0225_ESQA_ALLOC : 0QW0225_ESQAS : 0 QW0225_ESQA_ALLOC : 0 QW0225_ESQA_HWM : 0 QW0225_ECSA_ALLOC : 0QW0225_ESQA_HWM : 0 QW0225_ECSA_ALLOC : 0QW0225_ESQA_HWM : 0 QW0225_ECSA_ALLOC : 0QW0225_ESQA_HWM : 0 QW0225_ECSA_ALLOC : 0 QW0225_ECSA_HWM : 0 QW0225_ECSA_CONV : 0QW0225_ECSA_HWM : 0 QW0225_ECSA_CONV : 0QW0225_ECSA_HWM : 0 QW0225_ECSA_CONV : 0QW0225_ECSA_HWM : 0 QW0225_ECSA_CONV : 0 QW0225_CTGP : OFF QW0225_DISC : OFFQW0225_CTGP : OFF QW0225_DISC : OFFQW0225_CTGP : OFF QW0225_DISC : OFFQW0225_CTGP : OFF QW0225_DISC : OFF
The Information Management Specialists Further Reading • IBM DB2 10 Home Page http://www-01.ibm.com/software/data/db2/zos/db2-10/ • White Paper – DB2 10: A Smarter Database for a Smarter Planet https://www14.software.ibm.com/webapp/iwm/web/signup.do?source=s w-infomgt&S_PKG=wp-z-db2-smarter Also available as part of a “flashbook” - ISBN: 1583473610 • DB2 10 for z/OS Performance Topics Redbook (SG24-7942) http://www.redbooks.ibm.com/abstracts/sg247942.html?Open • IDUG – International DB2 User Group http://www.idug.org/

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Db2 10 memory management uk db2 user group june 2013 [read-only]

  • 1. The Information Management Specialists Memory Management in DB2 10 for z/OS Julian Stuhler UK DB2 GUIDE Meeting, June 2013
  • 2. The Information Management Specialists Acknowledgements • John Campbell • Michael Dewert • James Gill
  • 3. The Information Management Specialists Agenda • Introduction • What’s Changed & Why? • What Does It Mean for Me? • Summary & Questions Win a limited edition 30th Anniversary DB2 Geek T-Shirt for asking me a question!
  • 4. The Information Management Specialists Introduction • Julian Stuhler Director and Principal Consultant at Triton Consulting 25 years DB2 experience, 20 as a consultant working with customers in UK, Europe and the US IBM Gold Consultant since 1999 IBM Information Champion IDUG Past President Author of IBM Redbooks, white papers and more recently “flashbooks” Designer of IBM’s DB2 10 Business Value Assessment Estimator Tool
  • 5. The Information Management Specialists What’s Changed and Why? The Need for Scalability
  • 6. The Information Management Specialists The Need for Scalability • IT volumes continue to increase More applications More data More transactions • Performance is ever more important Customers need to support workload growth without a drop-off in performance • Availability is ever more important Pressure to reduce both planned and unplanned outages • End result: each DB2 environment is being asked to work harder, with less downtime • Every DB2 release attempts to push back these boundaries, but major progress has been made in DB2 10
  • 7. The Information Management Specialists DB2 Storage Usage – DBM1 storage below the bar 0 231 (2GB) 232 (4GB) “The Bar” 224 (16MB) “The Line” Typically 800 – 1900 MB Available to DB2 Typically 7 – 9 MB Available to DB2
  • 8. The Information Management Specialists Virtual Storage Enhancements • V8 began a major project to transform DB2 into a 64-bit RDBMS Laid the groundwork and provided some scalability improvements but a lot of DBM1 objects remained below the 2GB bar • DB2 9 improved things a little, but only by another 10-15% for most customers Practical limit of 300-500 threads per DB2 subsystem • DB2 10 moves 80-90% of the remaining objects above the bar, resulting in 5-10x improvement in threads per subsystem (CM)
  • 9. The Information Management Specialists Virtual Storage Enhancements All storage EDMPool Thread Storage Dataset Storage Castout buffers Compression Dict DBD Cache Global DSC RIDPOOL SORTPOOL CT + PT Thread Storage Dataset Storage Castout buffers Compression Dict DBD Cache Global DSC RIDPOOL SORTPOOL SKCT + PT (Pointers) Dataset Storage Castout buffers Compression Dict DBD Cache Global DSC RIDPOOL SORTPOOL SKCT + PT CT + PT Thread V7 V8 V9 V10
  • 10. The Information Management Specialists Real Storage Enhancements • For prior releases, z/OS always managed DB2 bufferpool pages as 4K frames • Move to 64-bit architecture made much larger buffer pools viable Bufferpools can use many millions of pages Increased z/OS overheads for page management DB2 9 Buffer Pool z/OS Storage 4K Pages 4K Pages
  • 11. The Information Management Specialists Real Storage Enhancements • DB2 10 introduces support for 1MB pages to reduce z/OS page management overheads Needs z10/z196/zEC12 server Needs bufferpool to be defined with PGFIX=YES z/OS sysprogs must partition real storage between 4K and 1MB frames (IESYSnn in PARMLIB, needs IPL) so wait until DB2 10 is bedded in • Key part of potential DB2 10 CPU reduction Customer testing during beta program showed CPU reductions of 0-6% with this feature enabled DB2 10 Buffer Pool z/OS Storage 4K Pages 1MB Pages
  • 12. The Information Management Specialists What Does It Mean For Me?
  • 13. The Information Management Specialists Real Storage Availability • DB2 10 removes most virtual storage constraints, but you need sufficient real storage to back any increased virtual storage usage Paging will still kill you in a 64-bit environment, should be near zero • Plan on additional 10-30% real memory for DB2 following migration from DB2 9 Most customers will be at lower end of this range, but more will be required once you start using some DB2 10 capabilities. Skip migration customers will need more
  • 14. The Information Management Specialists Real Storage Availability • Insufficient real storage to back usage of virtual leads to paging activity • It is critical to ensure that page-in activity (aka “demand paging”) for DB2 address spaces is minimised (near zero) No expanded storage in 64-bit environment, all paging is to disk (AUX) Any page-in operation is very expensive in performance terms compared to page hit in real storage Note that page-out operations are normal for rarely-used pages and not usually a cause for concern • Real storage shortages can have serious impact on stability of overall system If all AUX is consumed, LPAR goes into wait state and may fail Can lead to long system dump processing times, with high risk of system-wide slowdowns and incomplete dumps
  • 15. The Information Management Specialists Real Storage Availability • You also need to allow approx. 16GB for DB2 dump requirement (twice the 8GB value recommended for DB2 8 and 9) MAXSPACE parameter defines max amount of virtual storage for SVC dump – z/OS default is 500MB Some customer horror stories due to insufficient storage being available for dumps • Good news if you’re on a z196, as the “technology dividend” means that cost per GB is around 75% less than for a z10 Cheaper still for zEC12 • Many customers are already running lean on real storage even under V9, and are building real storage increase costs into their DB2 10 financial justifications
  • 16. The Information Management Specialists Real Storage Monitoring • Statistics IFCID 225 has long been vital for DB2 storage monitoring Part of Statistics Class 1 trace since PQ99658, so now enabled by default • Once DB2 10 is implemented in your environment, focus should change from virtual to real storage monitoring • PM24723 and PM37647 introduce important real storage monitoring and contraction enhancements ICFID 225 enhanced with new fields to externalise real and auxiliary storage consumption for storage objects in private, shared, and common areas above the bar (see additional information at end of presentation) Introduces two new DSNZPARMs to tell DB2 if and how to release any unused real storage (REALSTORAGE_MANAGEMENT) and specify upper limit on DB2 real storage usage (REALSTORAGE_MAX) – see next slide Some increase in MSTR CPU due to storage monitoring. Make sure PTFs for z/OS APAR OA37821 and corresponding DB2 APAR PM49816 are also applied – see later
  • 17. The Information Management Specialists Real Storage Monitoring • Opaque DSNZPARMs introduced by PM24723 and PM37647 • REALSTORAGE_MANAGEMENT ON – Unused backed real frames discarded when possible (CPU overhead) OFF – DB2 will only discard unused frames when critical real storage or auxiliary storage usage is detected AUTO (default) – DB2 will discard unused frames when the system begins to page Recommended value = AUTO DSNV516I and DSNV517I written when DB2 enters and exits real storage contraction mode • REALSTORAGE_MAX Hard limit on real and auxiliary storage used by DB2 subsystem – DB2 will terminate if limit reached Valid values: NOLIMIT (default), 1 – 65,535 (GB) Recommended value = 2 x amount of real and auxiliary storage that the subsystem might reasonably consume DSNS003I written when DB2 approaches the threshold and DSNS004I written to indicate relief from this condition
  • 18. The Information Management Specialists Real Storage – Other Issues • Ensure PTFs for z/OS APAR APAR OA37821 and corresponding DB2 APAR PM49816 are applied Fixes MSTR CPU issue associated with MVS COUNTPAGES function used for real storage monitoring (introduced by our good friend PM24723) Especially noticable where more than one DB2 subsystem resides on same LPAR,or on an idle system Needs IPL to implement z/OS fix Both APARs marked as HIPER – you are strongly advised to implement the associated PTFs before migrating to DB2 10 in any production environments • What about CONTSTOR and MINSTOR? Enabling these ZPARMs in previous releases allowed you to spend a little more CPU in exchange for improved virtual storage utilisation Both ZPARMs apply to 31-bit storage only, so are less important in DB2 10 Recommendation is CONTSTOR=MINSTOR=NO once you have proven VSCR in DB2 10
  • 19. The Information Management Specialists Other Limiting Factors • DBM1 Virtual Storage should no longer be an issue, but other limiting factors on vertical scalability still remain ESQA/ECSA (31-bit) storage Active log write contention (LC19) SMF volumes (DB2 10 SMF compression can help)
  • 20. The Information Management Specialists Use New DB2 10 Features • Only consider use of new features when you are sure you have fully considered all the previous items and DB2 10 is properly “bedded in” • Remember that some VSCR enhancements are available in CM, but you need package rebind to get maximum benefits
  • 21. The Information Management Specialists Use New DB2 10 Features • Exploit 1MB real storage frames Needs PGFIX=YES, but many customers still haven’t exploited this feature in their DB2 8 and DB2 9 systems despite significant potential CPU savings (up to 6% seen) PGFIX=YES benefits dependent on I/O rate, and you need to back pools 100% with real storage (scary if you’re already running lean on real storage availability) 1MB page frames specified by LFAREA in IEASYSnn parmlib member, and need IPL to implement ► Use /DISPLAY VIRTSTOR,LFAREA after implementation to ensure sizing is OK, as conversion between 4K and 1MB frames costs CPU Ensure you are up to date on z/OS maintenance before enabling
  • 22. The Information Management Specialists DB2 10 Real Storage Enhancements • 1MB page frame support for buffer pools CPU savings of up to 4% by reducing z/OS page management overheads for big BPs ► DB2 BPs can be up to 1TB total in DB2 9 and 10, with limit of 2x available real storage z/OS sysprogs must partition real storage between 4K and 1MB frames ► LFAREA parm in IEASYSnn PARMLIB (expressed in %, MB or GB, 80% max) ► Need IPL to change LFAREA, so ensure DB2 10 is properly “bedded in” before implementing!
  • 23. The Information Management Specialists DB2 10 Real Storage Enhancements • z/OS can decompose 1MB pages into 256 x 4KB pages, or recombine 4KB pages into 1MB pages if SOS condition occurs Costs CPU and elapsed time so should be avoided by setting LFAREA appropriately LFAREA Decompose / recombine
  • 24. The Information Management Specialists Tuning – Setting LFAREA • Sizing guideline Review BPs and set PGFIX=YES where suitable ► Ensure sufficient real storage to back BP ► See BP tuning section earlier Set LFAREA = SUM (page-fixed BPs) + 10% ► Assumes DB2 is only major user of 1MB page frames, but allows 10% “wriggle room” Verify sizing is correct (after IPL and DB2 BP allocation!) ► /DISPLAY VIRTSTOR,LFAREA (no decomposition) ► -DIS BUFFERPOOL(nn) SERVICE=4 (no 4K pages used for page-fixed buffer pools) • Review LFAREA whenever BP sizes, page-fix attribute etc is changed Sysprogs and DBAs must co-ordinate activities (should be BAU!)
  • 25. The Information Management Specialists Real Storage Monitoring • Monitor use of 1MB page frames used by a specific BP -DISPLAY BUFFERPOOL(BPnn) SERVICE=4 Resultant DSNB999I message shows number of 1MB pages in use ----DBA1 DIS BUFFERPOOL(BP0) SERVICE=4DBA1 DIS BUFFERPOOL(BP0) SERVICE=4DBA1 DIS BUFFERPOOL(BP0) SERVICE=4DBA1 DIS BUFFERPOOL(BP0) SERVICE=4 DSNB401I -DBA1 BUFFERPOOL NAME BP0, BUFFERPOOL ID 0, USE COUNT 246 DSNB402I -DBA1 BUFFER POOL SIZE = 5000 BUFFERS AUTOSIZE = NO 641 ALLOCATED = 5000 TO BE DELETED = 0 IN-USE/UPDATED = 172 DSNB406I -DBA1 PGFIX ATTRIBUTE - 642 CURRENT = NO PENDING = NO PAGE STEALING METHOD = LRU DSNB404I -DBA1 THRESHOLDS - 643 VP SEQUENTIAL = 80 DEFERRED WRITE = 30 VERTICAL DEFERRED WRT = 5, 0 PARALLEL SEQUENTIAL =50 ASSISTING PARALLEL SEQT= 0 DSNB999I -DBA1 DSNB1DBP SERVICE( 4 )OUTPUT DSNB999I -DBA1 4K PAGES 5000 DSNB999I -DBA1 1M PAGES 0 DSN9022I -DBA1 DSNB1CMD '-DIS BUFFERPOOL' NORMAL COMPLETION
  • 26. The Information Management Specialists Real Storage Monitoring • Monitor use of 1MB page frames across LPAR /DISPLAY VIRTSTOR,LFAREA (needs APAR OA31116) IAR019I message shows breakdown of 4KB and 1MB page frames and how much of each is currently available HWM usage is also shown – useful for ensuring correct segmentation of 4K and 1MB pages in z/OS /DISPLAY VIRTSTOR,LFAREA IAR019I 12.31.04 DISPLAY VIRTSTOR SOURCE = GS TOTAL LFAREA = 1024M LFAREA AVAILABLE = 1023M LFAREA ALLOCATED (1M) = 10M LFAREA ALLOCATED (4K) = 2M MAX LFAREA ALLOCATED (1M) = 10M MAX LFAREA ALLOCATED (4K) = 2M Current / HWM LFAREA allocated for 4KB pages (pages decomposed)
  • 27. The Information Management Specialists Use New DB2 10 Features • Possibility for less DB2 subsystems (and possibly less LPARs) in a data sharing environment Lower data sharing overhead Less systems to manage / maintain Minimum of 4 members / 2 LPARs still recommended for high availability
  • 28. The Information Management Specialists Use New DB2 10 Features • More space for performance critical storage objects such as dynamic statement cache Improve DSC hit ratio and reduce CPU accordingly Potential for significant MAXKEEPD increase is a key part of the overall DB2 10 value proposition for SAP customers • Potential to reduce CPU cost through more use of persistent threads with RELEASE(DEALLOCATE) CICS protected entry threads DB2 10 High-Performance DBATs Remember trade-off on BIND/DDL concurrency with use of RELEASE(DEALLOCATE) • Don’t forget that you’ll need to allocate additional real storage to back any increases above!
  • 29. The Information Management Specialists The Future • IBM announced zEnterprise EC12 in August 2012 12th generation processor, running at 5.5GHz Up to 101 configurable processors per server Flash express – up to 6.4TB of SSD as a new memory tier between RAIM and disk • Several new memory-related features planned DB2 code backed by 1MB page frames Pageable 1MB page frames (no need for PGFIX=YES) Support for (non pageable) 2GB page frames Support for Flash express • IBM statement of direction for DB2 exploitation of these features in a future release ☺
  • 30. The Information Management Specialists Summary & Questions
  • 31. The Information Management Specialists Summary • Make sure you have enough real storage before upgrading to DB2 10 • Change your focus from monitoring virtual storage to monitoring real storage • If you are scaling vertically or consolidating subsystems, be aware of other limiting factors that were previously invisible but may now come to bite you • Once you’ve addressed ALL of the above, start to make use of the new DB2 10 storage-related features Remember to add more real storage as required in order to prevent paging
  • 32. The Information Management Specialists Feedback / Questions Julian Stuhler – julian.stuhler@triton.co.uk Triton Consulting 25 Bank Plain Norwich NR2 4SF www.triton.co.uk
  • 33. The Information Management Specialists Additional Information
  • 34. The Information Management Specialists Real Storage Monitoring – New IFCID 225 Counters ADDRESS SPACE SUMMARYADDRESS SPACE SUMMARYADDRESS SPACE SUMMARYADDRESS SPACE SUMMARY –––– DBM1DBM1DBM1DBM1 EXTENDED REGION SIZE (MAX) : 1587544064 24EXTENDED REGION SIZE (MAX) : 1587544064 24EXTENDED REGION SIZE (MAX) : 1587544064 24EXTENDED REGION SIZE (MAX) : 1587544064 24----BIT LOW PRIVATE : 221184BIT LOW PRIVATE : 221184BIT LOW PRIVATE : 221184BIT LOW PRIVATE : 221184 24242424----BIT HIGH PRIVATE : 450560 31BIT HIGH PRIVATE : 450560 31BIT HIGH PRIVATE : 450560 31BIT HIGH PRIVATE : 450560 31----BIT EXTENDED LOW PRIVATE : 69603328BIT EXTENDED LOW PRIVATE : 69603328BIT EXTENDED LOW PRIVATE : 69603328BIT EXTENDED LOW PRIVATE : 69603328 31313131----BIT EXTENDED HIGH PRIVATE : 38600704 CURR HIGH ADDR 24BIT EXTENDED HIGH PRIVATE : 38600704 CURR HIGH ADDR 24BIT EXTENDED HIGH PRIVATE : 38600704 CURR HIGH ADDR 24BIT EXTENDED HIGH PRIVATE : 38600704 CURR HIGH ADDR 24----BIT PRIV REGION : X’0003C000’BIT PRIV REGION : X’0003C000’BIT PRIV REGION : X’0003C000’BIT PRIV REGION : X’0003C000’ CURR HIGH ADDR 31CURR HIGH ADDR 31CURR HIGH ADDR 31CURR HIGH ADDR 31----BIT PRIV REGION : X’270E9000’ 31BIT PRIV REGION : X’270E9000’ 31BIT PRIV REGION : X’270E9000’ 31BIT PRIV REGION : X’270E9000’ 31----BIT RESERVED FOR MUST COMPLETE : 158754406BIT RESERVED FOR MUST COMPLETE : 158754406BIT RESERVED FOR MUST COMPLETE : 158754406BIT RESERVED FOR MUST COMPLETE : 158754406 31313131----BIT RESERVED FOR MVS : 25827760 STORAGE CUSHION WARNING TO CONTRACT: 158754406BIT RESERVED FOR MVS : 25827760 STORAGE CUSHION WARNING TO CONTRACT: 158754406BIT RESERVED FOR MVS : 25827760 STORAGE CUSHION WARNING TO CONTRACT: 158754406BIT RESERVED FOR MVS : 25827760 STORAGE CUSHION WARNING TO CONTRACT: 158754406 TOTAL 31TOTAL 31TOTAL 31TOTAL 31----BIT GETMAINED STACK : 4341760 TOTAL 31BIT GETMAINED STACK : 4341760 TOTAL 31BIT GETMAINED STACK : 4341760 TOTAL 31BIT GETMAINED STACK : 4341760 TOTAL 31----BIT STACK IN USE : 3997696BIT STACK IN USE : 3997696BIT STACK IN USE : 3997696BIT STACK IN USE : 3997696 TOTAL 31TOTAL 31TOTAL 31TOTAL 31----BIT VARIABLE POOL : 12836864 TOTAL 31BIT VARIABLE POOL : 12836864 TOTAL 31BIT VARIABLE POOL : 12836864 TOTAL 31BIT VARIABLE POOL : 12836864 TOTAL 31----BIT FIXED POOL : 86016BIT FIXED POOL : 86016BIT FIXED POOL : 86016BIT FIXED POOL : 86016 TOTAL 31TOTAL 31TOTAL 31TOTAL 31----BIT GETMAINED : 1002384 AMOUNT OF AVAILABLE 31BIT GETMAINED : 1002384 AMOUNT OF AVAILABLE 31BIT GETMAINED : 1002384 AMOUNT OF AVAILABLE 31BIT GETMAINED : 1002384 AMOUNT OF AVAILABLE 31----BIT : 1479335936BIT : 1479335936BIT : 1479335936BIT : 1479335936 SYSTEM AGENT STACK STORAGE IN USE : 1234567SYSTEM AGENT STACK STORAGE IN USE : 1234567SYSTEM AGENT STACK STORAGE IN USE : 1234567SYSTEM AGENT STACK STORAGE IN USE : 1234567 TOTAL 64TOTAL 64TOTAL 64TOTAL 64----BIT VARIABLE POOL : 10162176 TOTAL 64BIT VARIABLE POOL : 10162176 TOTAL 64BIT VARIABLE POOL : 10162176 TOTAL 64BIT VARIABLE POOL : 10162176 TOTAL 64----BIT FIXED : 7503872BIT FIXED : 7503872BIT FIXED : 7503872BIT FIXED : 7503872 TOTAL 64TOTAL 64TOTAL 64TOTAL 64----BIT GETMAINED : 438127168 TOTAL 64BIT GETMAINED : 438127168 TOTAL 64BIT GETMAINED : 438127168 TOTAL 64BIT GETMAINED : 438127168 TOTAL 64----BIT PRIVATE FOR STOR MANAG: 1925120BIT PRIVATE FOR STOR MANAG: 1925120BIT PRIVATE FOR STOR MANAG: 1925120BIT PRIVATE FOR STOR MANAG: 1925120 REAL 4K FRAMES IN USE : 20577 AUXILIARY SLOTS IN USE : 41227REAL 4K FRAMES IN USE : 20577 AUXILIARY SLOTS IN USE : 41227REAL 4K FRAMES IN USE : 20577 AUXILIARY SLOTS IN USE : 41227REAL 4K FRAMES IN USE : 20577 AUXILIARY SLOTS IN USE : 41227 64646464----BIT REAL 4K FRAMES IN USE : 12129 64BIT REAL 4K FRAMES IN USE : 12129 64BIT REAL 4K FRAMES IN USE : 12129 64BIT REAL 4K FRAMES IN USE : 12129 64----BIT 4K AUX SLOTS IN USE : 27055BIT 4K AUX SLOTS IN USE : 27055BIT 4K AUX SLOTS IN USE : 27055BIT 4K AUX SLOTS IN USE : 27055 ABOVE VALUE W/O BP STORAGE : 10000 ABOVE VALUE W/O BP STORAGE : 4096ABOVE VALUE W/O BP STORAGE : 10000 ABOVE VALUE W/O BP STORAGE : 4096ABOVE VALUE W/O BP STORAGE : 10000 ABOVE VALUE W/O BP STORAGE : 4096ABOVE VALUE W/O BP STORAGE : 10000 ABOVE VALUE W/O BP STORAGE : 4096 HWM 64HWM 64HWM 64HWM 64----BIT REAL 4K FRAMES IN USE : 43047 HWM 64BIT REAL 4K FRAMES IN USE : 43047 HWM 64BIT REAL 4K FRAMES IN USE : 43047 HWM 64BIT REAL 4K FRAMES IN USE : 43047 HWM 64----BIT AUX SLOTS IN USE : 27059BIT AUX SLOTS IN USE : 27059BIT AUX SLOTS IN USE : 27059BIT AUX SLOTS IN USE : 27059 QW0225CTLP (S) : OFF QW0225CTLS (S) : OFFQW0225CTLP (S) : OFF QW0225CTLS (S) : OFFQW0225CTLP (S) : OFF QW0225CTLS (S) : OFFQW0225CTLP (S) : OFF QW0225CTLS (S) : OFF
  • 35. The Information Management Specialists Real Storage Monitoring – New IFCID 225 Counters SHARED/COMMON STORAGE SUMMARYSHARED/COMMON STORAGE SUMMARYSHARED/COMMON STORAGE SUMMARYSHARED/COMMON STORAGE SUMMARY EXTENDED CSA SIZE : 315179008 31EXTENDED CSA SIZE : 315179008 31EXTENDED CSA SIZE : 315179008 31EXTENDED CSA SIZE : 315179008 31----BIT COMMON FIXED POOL : 1122304BIT COMMON FIXED POOL : 1122304BIT COMMON FIXED POOL : 1122304BIT COMMON FIXED POOL : 1122304 31313131----BIT COMMON VARIABLE POOL : 716800 31BIT COMMON VARIABLE POOL : 716800 31BIT COMMON VARIABLE POOL : 716800 31BIT COMMON VARIABLE POOL : 716800 31----BIT COMMON GETMAINED : 79661BIT COMMON GETMAINED : 79661BIT COMMON GETMAINED : 79661BIT COMMON GETMAINED : 79661 64646464----BIT COMMON FIXED POOL : 3641344 64BIT COMMON FIXED POOL : 3641344 64BIT COMMON FIXED POOL : 3641344 64BIT COMMON FIXED POOL : 3641344 64----BIT COMMON VARIABLE POOL : 37748736BIT COMMON VARIABLE POOL : 37748736BIT COMMON VARIABLE POOL : 37748736BIT COMMON VARIABLE POOL : 37748736 64646464----BIT COMMON GETMAINED : 0 64BIT COMMON GETMAINED : 0 64BIT COMMON GETMAINED : 0 64BIT COMMON GETMAINED : 0 64----BIT COMMON FOR STOR MANAG : 1400832BIT COMMON FOR STOR MANAG : 1400832BIT COMMON FOR STOR MANAG : 1400832BIT COMMON FOR STOR MANAG : 1400832 64646464----BIT SHARED VARIABLE POOL : 13545472 64BIT SHARED VARIABLE POOL : 13545472 64BIT SHARED VARIABLE POOL : 13545472 64BIT SHARED VARIABLE POOL : 13545472 64----BIT SHARED FIXED : 3129344BIT SHARED FIXED : 3129344BIT SHARED FIXED : 3129344BIT SHARED FIXED : 3129344 64646464----BIT SHARED GETMAINED : 4220208 64BIT SHARED GETMAINED : 4220208 64BIT SHARED GETMAINED : 4220208 64BIT SHARED GETMAINED : 4220208 64----BIT SHARED FOR STOR MANAG : 2056192BIT SHARED FOR STOR MANAG : 2056192BIT SHARED FOR STOR MANAG : 2056192BIT SHARED FOR STOR MANAG : 2056192 64646464----BIT SHR SYSTEM AGENT STACK (AS) : 268435456 64BIT SHR SYSTEM AGENT STACK (AS) : 268435456 64BIT SHR SYSTEM AGENT STACK (AS) : 268435456 64BIT SHR SYSTEM AGENT STACK (AS) : 268435456 64----BIT SHR SYSTEM AS IN USE : 33554432BIT SHR SYSTEM AS IN USE : 33554432BIT SHR SYSTEM AS IN USE : 33554432BIT SHR SYSTEM AS IN USE : 33554432 64646464----BIT SHR NONBIT SHR NONBIT SHR NONBIT SHR NON----SYSTEM AS : 805306368 64SYSTEM AS : 805306368 64SYSTEM AS : 805306368 64SYSTEM AS : 805306368 64----BIT SHR NONBIT SHR NONBIT SHR NONBIT SHR NON----SYSTEM AS IN USE : 1048576SYSTEM AS IN USE : 1048576SYSTEM AS IN USE : 1048576SYSTEM AS IN USE : 1048576 SHARED MEMORY OBJECTS : 5SHARED MEMORY OBJECTS : 5SHARED MEMORY OBJECTS : 5SHARED MEMORY OBJECTS : 5 64646464----BIT SHARED MEMORY PAGES : 117440512 HWM 64BIT SHARED MEMORY PAGES : 117440512 HWM 64BIT SHARED MEMORY PAGES : 117440512 HWM 64BIT SHARED MEMORY PAGES : 117440512 HWM 64----BIT SHARED BYTES : 481036337152BIT SHARED BYTES : 481036337152BIT SHARED BYTES : 481036337152BIT SHARED BYTES : 481036337152 64646464----BIT SHARED PAGES BACKED IN REAL : 9395 AUX SLOTS USED FOR 64BIT SHARED PAGES BACKED IN REAL : 9395 AUX SLOTS USED FOR 64BIT SHARED PAGES BACKED IN REAL : 9395 AUX SLOTS USED FOR 64BIT SHARED PAGES BACKED IN REAL : 9395 AUX SLOTS USED FOR 64----BIT SHARED : 5385BIT SHARED : 5385BIT SHARED : 5385BIT SHARED : 5385 64646464----BIT PAGES PAGED IN FROM AUX STO : 5317 64BIT PAGES PAGED IN FROM AUX STO : 5317 64BIT PAGES PAGED IN FROM AUX STO : 5317 64BIT PAGES PAGED IN FROM AUX STO : 5317 64----BIT PAGES PAGED OUT TO AUX STO : 41577BIT PAGES PAGED OUT TO AUX STO : 41577BIT PAGES PAGED OUT TO AUX STO : 41577BIT PAGES PAGED OUT TO AUX STO : 41577 64646464----BIT SHR STG REAL 4K FRMS IN USE : 12344459 64BIT SHR STG REAL 4K FRMS IN USE : 12344459 64BIT SHR STG REAL 4K FRMS IN USE : 12344459 64BIT SHR STG REAL 4K FRMS IN USE : 12344459 64----BIT SHR STG 4K AUX SLTS IN USE : 512BIT SHR STG 4K AUX SLTS IN USE : 512BIT SHR STG 4K AUX SLTS IN USE : 512BIT SHR STG 4K AUX SLTS IN USE : 512 64646464----BIT STK STG REAL 4K FRMS IN USE : 12345789 64BIT STK STG REAL 4K FRMS IN USE : 12345789 64BIT STK STG REAL 4K FRMS IN USE : 12345789 64BIT STK STG REAL 4K FRMS IN USE : 12345789 64----BIT STK STG 4K AUX SLTS IN USE : 256BIT STK STG 4K AUX SLTS IN USE : 256BIT STK STG 4K AUX SLTS IN USE : 256BIT STK STG 4K AUX SLTS IN USE : 256 64646464----BIT COM STG REAL 4K FRMS IN USE : 12345123456789 64BIT COM STG REAL 4K FRMS IN USE : 12345123456789 64BIT COM STG REAL 4K FRMS IN USE : 12345123456789 64BIT COM STG REAL 4K FRMS IN USE : 12345123456789 64----BIT COM STG 4K AUX SLTS IN USE : 1234555555BIT COM STG 4K AUX SLTS IN USE : 1234555555BIT COM STG 4K AUX SLTS IN USE : 1234555555BIT COM STG 4K AUX SLTS IN USE : 1234555555 SERVICE INFORMATION:SERVICE INFORMATION:SERVICE INFORMATION:SERVICE INFORMATION: QW0225_WARN : 0 QW0225_REALAVAIL : 0QW0225_WARN : 0 QW0225_REALAVAIL : 0QW0225_WARN : 0 QW0225_REALAVAIL : 0QW0225_WARN : 0 QW0225_REALAVAIL : 0 QW0225_REALAVAILLO : 0 QW0225_REALAVAILOK : 0QW0225_REALAVAILLO : 0 QW0225_REALAVAILOK : 0QW0225_REALAVAILLO : 0 QW0225_REALAVAILOK : 0QW0225_REALAVAILLO : 0 QW0225_REALAVAILOK : 0 QW0225_ESQAS : 0 QW0225_ESQA_ALLOC : 0QW0225_ESQAS : 0 QW0225_ESQA_ALLOC : 0QW0225_ESQAS : 0 QW0225_ESQA_ALLOC : 0QW0225_ESQAS : 0 QW0225_ESQA_ALLOC : 0 QW0225_ESQA_HWM : 0 QW0225_ECSA_ALLOC : 0QW0225_ESQA_HWM : 0 QW0225_ECSA_ALLOC : 0QW0225_ESQA_HWM : 0 QW0225_ECSA_ALLOC : 0QW0225_ESQA_HWM : 0 QW0225_ECSA_ALLOC : 0 QW0225_ECSA_HWM : 0 QW0225_ECSA_CONV : 0QW0225_ECSA_HWM : 0 QW0225_ECSA_CONV : 0QW0225_ECSA_HWM : 0 QW0225_ECSA_CONV : 0QW0225_ECSA_HWM : 0 QW0225_ECSA_CONV : 0 QW0225_CTGP : OFF QW0225_DISC : OFFQW0225_CTGP : OFF QW0225_DISC : OFFQW0225_CTGP : OFF QW0225_DISC : OFFQW0225_CTGP : OFF QW0225_DISC : OFF
  • 36. The Information Management Specialists Further Reading • IBM DB2 10 Home Page http://www-01.ibm.com/software/data/db2/zos/db2-10/ • White Paper – DB2 10: A Smarter Database for a Smarter Planet https://www14.software.ibm.com/webapp/iwm/web/signup.do?source=s w-infomgt&S_PKG=wp-z-db2-smarter Also available as part of a “flashbook” - ISBN: 1583473610 • DB2 10 for z/OS Performance Topics Redbook (SG24-7942) http://www.redbooks.ibm.com/abstracts/sg247942.html?Open • IDUG – International DB2 User Group http://www.idug.org/