IMS V13 Overview_ATS - IMS UG NYC Sept 2013.pdf


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IMS V13 Overview_ATS - IMS UG NYC Sept 2013.pdf

  1. 1. © 2011 IBM Corporation ® IMS Version 13 IMS 13 Overview IBM Advanced Technical Skills
  2. 2. IMS Version 13 2 IMS 13 - Agenda Status of IMS Versions Prerequisites, Migration, Coexistence System Enhancements Transaction Manager and Connectivity Enhancements Database and DBRC Enhancements 2
  3. 3. IMS Version 13 3 Status of IMS Versions IMS Version 9 – End of service was November 7, 2010 IMS Version 10 – Generally available on October 26, 2007 – End of service was November 5, 2012 IMS Version 11 – Generally available on October 30, 2009 – End of service has not been announced IMS Version 12 – Generally available on October 28, 2011 – End of service has not been announced IMS Version 13 – Announced on October 3, 2012 – Currently in QPP program – General availability has not been announced
  4. 4. IMS Version 13 4 Software Prerequisites Minimum software level prerequisites – z/OS V1R13 (5694-A01) • RACF (included in separately orderable SecureWay Security Server), or equivalent, if security is used • High Level Assembler Toolkit Release 5 (5696-234) • APAR OA39392 / PTF UA66823 is required for z/OS 1.13 for IMS V13 – IRLM 2.3 if the IRLM is used * subject to change
  5. 5. IMS Version 13 5 Software Prerequisites ... Minimum software levels for optional functions – Java Dependent Regions requires JDK 6.0.1 – ISC TCP/IP requires CICS 5.1 – Depending on the environment, the IMS Universal Drivers require: • IBM JDK 6.0.1 or later • DB2 V9.1 or later • WAS V7 or later • CICS V4.1 or later – DB Versioning requires implementation of the IMS Catalog * subject to change
  6. 6. IMS Version 13 6 Software Prerequisites ... Minimum software levels for optional functions ... – IMS 13 supports interactions with • DB2: Versions 9, 10 • CICS: Versions 3.2, 4.1, 4.2, 5.1 – CICS 5.1 (newly announced) is required for ISC TCP/IP support • Requires z/OS 1.13 • MQ for z/OS: Versions V7.0.1, V7.1 – Note V6 EOS was September 2012 – 7.01 introduced MQ message expiry interfacing with IMS transaction expiration – 7.1 enhanced the expiry support and support for OTMA resource monitoring protocol messages * subject to change
  7. 7. IMS Version 13 7 Hardware Prerequisites IMS 13 runs only on 64 bit processors running in z/Architecture mode – Processors must also support the Long-Displacement Facility of the z/Architecture – ESA mode is not supported – For a list of z/Series machines see: z900 machines must be at GA2 level (microcode level 3G or later)
  8. 8. IMS Version 13 8 Hardware Prerequisites ... Sysplex Data Sharing (including Data Caching and VSO Data Sharing) – Coupling Facility (CF) level 9, or later Shared Queues and Shared EMH support – Coupling Facility level 9 or later – System-managed CF Duplexing • CF level 12, or later and bidirectional CF to CF links EAV support for non-VSAM data sets – EAVs are supported on DS8000 at microcode level R4.0 via bundle (Sept 2008) or higher
  9. 9. IMS Version 13 9 Supported Migrations and Coexistence IMS 12 to IMS 13 – Upgrade RECONs from IMS 12 to IMS 13 – Databases are compatible – Application programs are compatible IMS 11 to IMS 13 – Upgrade RECONs from IMS 11 to IMS 13 – Databases are compatible – Application programs are compatible Check Release Planning documentation at GA for additional prerequisites/coexistence/migration items
  10. 10. IMS Version 13 10 IMS 13 System Enhancements IMS Connect Enhancements Concurrent Application Threads Reduced Total Cost of Ownership (TCO) IMS Command Enhancements IMS CQS Enhancement IMS DRD Enhancement IMS User Exit Enhancements IMS Security Enhancements /DIAG Command Enhancements
  11. 11. IMS Version 13 11 IMS Connect Enhancements XML Converter Enhancements Auto-restart of the Language Environment (LE) Expanded Recorder Trace Records Use of RACF Event Notification Facility (ENF) Support for cached RACF UserIDs (UID) Reporting of overall health to Workload Manager (WLM) Configurable TCP/IP backlog (queue) size
  12. 12. IMS Version 13 12 XML Converter Enhancements Support for extending the current limit of 100 up to 2000 for the maximum number of XML converters • New IMS Connect configuration parameter MAXCVRT ADAPTER( , MAXCVRT= value) • IMS 12 (PM64487 / UK79728) Capability to view converters that are currently loaded – New Type-2 Command: QUERY IMSCON TYPE(CONVERTER) • Requests detailed information about XML converters in IMS Connect Benefits – Enhances the flexibility of converter usage • Directly impacts IMS Soap Gateway environments
  13. 13. IMS Version 13 13 Auto-restart of the Language Environment (LE) Automated mechanism to reinitialize the Language Environment when an XML converter ABENDs – Without restarting IMS Connect – Converters will be reloaded as they are needed Automatic refresh of the BPE User Exit for the XML Adapters (HWSXMLA0) after the ABEND limit ABLIM has been reached Benefit – Improved efficiencies during error conditions • Eliminates IMS Connect restart and user interactions
  14. 14. IMS Version 13 14 Expanded Recorder Trace Records The Recorder trace records have been expanded to: – Capture entire messages sent and received using: • All TCP/IP communications – Including DRDA sockets and ISC TCP/IP • SCI (OM, ODBM, MSC, and ISC communications) • Requires a Trace Level HIGH and use of the external trace data set UPDATE TRACETABLE NAME(RCTR) OWNER(HWS) LEVEL(HIGH) EXTERNAL(YES | NO) Benefits – Improved diagnostics and problem determination
  15. 15. IMS Version 13 15 RACF Event Notification Facility (ENF) Support Background – IMS Connect V12 provided the option to cache RACF UserIDs (UIDs) along with a command to refresh them IMS Connect V13: RACF ENF Support for Cached UserIDs (UID) – Automatically refreshes cached UIDs by listening to RACF events (ENF signals) indicating that a change has been made to a UID – NOTE: This function applies only when RACF UID caching has been enabled in IMS Connect Benefit – Allows IMS Connect to listen for certain RACF events indicating that a change has been made to a specific UserID • Avoids manual intervention
  16. 16. IMS Version 13 16 Reporting of Overall Health to WLM WLM (Workload Manager) Health Report – New function to automatically report the overall health of IMS Connect • Allows Sysplex Distributor to use and take into account this information for workload balancing Benefit – Allows WLM to know when resources are constrained or available – Minimizes the possibility of Sysplex Distributor assigning work that IMS Connect is unable to handle
  17. 17. IMS Version 13 17 Configurable TCP/IP backlog (Queue) size New parameter TCPIPQ – Allows users to configure the length of the queue in TCP/IP for connection requests that have not yet been assigned a socket. • Connection requests are held on this queue until IMS Connect can assign a socket – Overrides the default which is equal to the maxsoc value • Actual value used is the smaller of IMS Connect’s TCPIPQ value and SOMAXCONN in TCP/IP Benefit – Provides a configurable option to increase the backlog queue size in TCP/IP
  18. 18. IMS Version 13 18 Overall Value of IMS Connect Enhancements Enhanced usability while providing better performance and diagnostics Increased resiliency to Abnormal Ends (ABENDs) Improved usability and manageability
  19. 19. IMS Version 13 19 Concurrent Application Threads Enhancement Partition Specification Table (PST) used for – Active dependent regions (MSG/BMP/IFP/JMP/JBP) – CICS/DBCTL threads – Open Database Access threads Customers continue to require more PSTs! – 31 dependent regions - 1980 (IMS 1.1.6) – 999 dependent regions - 1995 (IMS 5.1) – 4095 dependent regions - 2013 (IMS 13) Related parameters – MAXPST= – PST= – MAXTHRDS= for ODBM – MAXTHRDS=, MINTHRDS= for DBCTL
  20. 20. IMS Version 13 20 MAXPST= parameter Used in DBC, DCC, and IMS procedures – Specifies the maximum number of PSTs for an online IMS control region – Default is 255 (no change) – Maximum value is 4095 in IMS 13 (quadrupled) Controls maximum number of – Active dependent regions (MSG/BMP/IFP/JMP/JBP) – CICS/DBCTL threads – Open Database Access threads Reducing MAXPST= requires a cold start
  21. 21. IMS Version 13 21 Benefits of the Concurrent Thread Enhancement (Increasing MAXPST) Customers can now have increased capacity/scalability for their IMS systems – Larger capacity for mergers/acquisitions • Without having to add more IMS images – Increased workloads with latest zEnterprise hardware • Room for vertical growth – More regions for IMS 13 synchronous program switch function, also synchronous callout, distributed syncpoint/etc. • Longer region occupancies MAXPST should no longer be a limiting factor in IMS growth
  22. 22. IMS Version 13 22 Reduced Total Cost of Ownership Cross-platform focus on reducing mainframe software costs Major focus on reducing CPU usage Changes throughout IMS to improve performance, reduce storage usage and reduce CPU used to run IMS – Using more efficient storage services – Improved algorithms – Reducing pathlength – Optimizing frequently used processes – Latch / lock improvements – Storage reductions – Use of zEnterprise hardware functions Benefits – Improved performance, lower cost per transaction, reduced cost of ownership.
  23. 23. IMS Version 13 23 Specific Reduced TCO Enhancements IMS logger LOG latch contention reduction – Improves usage of log latch and log buffer management for increased logging bandwidth and more efficient processing Shared queues local first optimization now applies to program-to- program switch messages as well as ordinary input messages – Avoids false scheduling on another IMS when the local IMS can process the program-to-program switch message Exploitation of pageable 1M pages – Based on usage of new zEC12 processors with Flash Express storage and z/OS 1.13 (Dec. 2012) – Provides improvements in dynamic address translation and usage of translation lookaside buffer (TLB) DB Space Management Block Serialization Latch Improvements – Split from single to multiple latches to improve heavy BMP workloads MEMDSENQMGMT Exploitation – More efficient memory-based data set ENQ management improves allocation of large number of data sets
  24. 24. IMS Version 13 24 Other Reduced TCO Enhancements OTMA YTIB chain changed from a single linked list to a hash table, to improve FINDDEST performance. Convert OTMA and IMS Connect STORAGE calls to CPOOL Remove unnecessary clearing of OTMA buffers DFSCPY00 improved SVC directory entry search algorithm and removal of IVSK instructions. OSAM CML Lock Reduction General instruction optimization (replacing STCK with STCKF, long displacement facility exploitation) IMS cache manager spin loop elimination CQS mainline modules changed to use branch-relative branching Cache efficiency improvements (DPST blocks packed into a single IPAGE to keep cache references localized) IMS page load service algorithm optimization IMS dispatcher optimizations
  25. 25. IMS Version 13 25 ESAF support in Java Dependent Regions (JDR) With IMS 13, there are two methods for accessing DB2 from JDRs – Access via the previously existing DB2 RRSAF interface – Access via the standard ESAF interface With IMS 13, the ESAF interface can be used in JMP/JBP regions to access any ESAF defined to the IMS control region – WebSphere MQ, DB2, WOLA (WebSphere Optimized Local Adapter) Support for the SSM= parameter on the JMP/JBP dependent region startup JCL Only one ESS connection method allowed per JMP/JBP – Default ESS connection method is DB2 RRSAF • No impact to existing users Benefits – Simpler, more efficient, and more consistent interface
  26. 26. IMS Version 13 26 IMS Command Enhancements Overview DBRC command enhancements DEDB Alter command enhancements /DIAGNOSE SNAP command enhancement HALDB command enhancements IMS Connect type-2 command enhancements – Dynamically create data store definitions (CREATE IMSCON TYPE(DATASTORE)) – Dynamically create port definitions (CREATE IMSCON TYPE(PORT)) – Query XML converters loaded in IMS Connect (QUERY IMSCON TYPE(CONVERTER)
  27. 27. IMS Version 13 27 IMS Command Enhancements Enhancements are focused on type-2 commands for the Operations Manager (OM) environment Benefits – Support of new IMS 13 functions – Improved manageability
  28. 28. IMS Version 13 28 IMS CQS Enhancement When IMS Common Queue Server (CQS) rejects a z/OS STOP cqsjobname command because CQS clients are still connected (CQS0300I), CQS issues a new message, CQS0301I, for each connected client – Enables the operator to shut down or quiesce the connected CQS clients so that the CQS address space can be stopped Benefits – Improved manageability for CQS
  29. 29. IMS Version 13 29 IMS DRD Enhancement Support for the IMS repository (a single centralized store for resource definitions in an IMSplex) enhanced to validate resource attributes between associated resources when a resource definition is added to, updated in, or deleted from the IMSRSC Repository – Validates transaction, routing code, and program attributes Also provided through the IMS 12 service process – APAR PM32805 / PTF UK75915 Benefits – Simplifies management of the DRD resources
  30. 30. IMS Version 13 30 IMS 13 User Exit Enhancements Enhanced user exit services extended to additional IMS control region user exits Users can now dynamically refresh more IMS user exit routines to bring in an updated version of the exit (or add/delete) – Significantly reduces downtime since IMS control region no longer requires restart Users can now display information about more user exits that are defined in the USER_EXITS section of DFSDFxxx – Provides useful exit information to the user Users can now code an exit to leverage IMS’s ability to call multiple routines of the same type from a single point within the exit
  31. 31. IMS Version 13 31 BSEX (DFSBSEX0, Build Security Environment Exit) NDMX (DFSNDMX0, Non-Discardable Message Exit) RASE (DFSRAS00, Resource Access Security Exit) OTMAYPRX (DFSYPRX0, OTMA Destination Resolution Exit) OTMARTUX (DFSYRTUX, OTMA Resume TPIPE Security Exit) OTMAIOED (DFSYIOE0, OTMA Input/Output Edit Exit) LOGWRT (DFSFLGX0, Logger Exit) LOGEDIT (DFSFLGE0, Log Edit Exit) Enhanced User Exit Services Added to More Control Region Exit Types
  32. 32. IMS Version 13 32 IMS Security Enhancements All IMS security settings can now be defined as IMS startup parameters – Updates to SECURITY macro in system definition (SYSGEN) no longer required due to its removal – Previously, certain settings could only be defined in SECURITY macro Move security user exits out of the IMS nucleus into 31-bit storage – DFSCSGN0 – DFSCTRN0 – DFSCTSE0
  33. 33. IMS Version 13 33 New IMS Startup Security Parameters RCLASS parameter added to DFSPBxxx PROCLIB member – RCLASS support in DFSDCxxx PROCLIB member will remain • DFSPBxxx RCLASS parameter value will override DFSDCxxx if specified in both SECCNT parameter added to DFSDCxxx PROCLIB member Retrofit SPE APARs/PTFs available for IMS startup security parameter enhancement activation in IMS 11 and IMS 12 – PM48203/UK74050 (IMS 11) – PM48204/UK74051 (IMS 12) – If specifying RCLASS in DFSPBxxx/DFSDCxxx, can also have the following APARs/PTFs applied to avoid an error message being issued when it shouldn’t be • PM72199/UK82616 (IMS 11) • PM73558/UK82617 (IMS 12)
  34. 34. IMS Version 13 34 /DIAGNOSE Command Enhancements Process for capturing diagnostic data used in troubleshooting IMS issues has been simplified – SYSOUT option now available for /DIAGNOSE SNAP output • Documentation can be gathered/stored in a readable format that is easy to retrieve and send to IBM support • Time-consuming SYSLOG searches and manual data formatting prior to transmission no longer required – /DIAGNOSE SNAP command extended to include more resources + more coverage of existing resources • SHOW() support added for LTERM, NODE and USER • BLOCK – can now specify multiple single instance blocks and more blocks can be snapped • More blocks can be snapped for DB, LINE, LINK • MSNAME support added
  35. 35. IMS Version 13 35 /DIAGNOSE Command Enhancements Benefits – Cost effective, non-disruptive alternative to console dumps – /DIAGNOSE command is now more interactive • Can be used more as a tool for easing the real-time diagnosis process – Decreased time and effort required in capturing diagnostic information – Improved turn-around time in problem resolution
  36. 36. IMS Version 13 36 Summary of IMS 13 System Topics IMS Connect Enhancements Concurrent Application Threads Reduced Total Cost of Ownership (TCO) IMS Command Enhancements IMS CQS Enhancement IMS DRD Enhancement IMS User Exit Enhancements IMS Security Enhancements /DIAG Command Enhancements
  37. 37. IMS Version 13 37 IMS 13 Transaction Manager and Connectivity Enhancements Callout function enhancements ISC Over TCP/IP OTMA enhancements Non-Discardable Message Exit (DFSNDMX0) enhancements
  38. 38. IMS Version 13 38 Callout function enhancements Synchronous program switch Enhancements to RECEIVE function for handling truncated messages OTMA destination descriptors support asynchronous messages that are going to IBM WebSphere® MQ.
  39. 39. IMS Version 13 39 Background DL/I ICAL support from previous IMS releases – Provided synchronous callout capability to resources outside IMS IMS SOAP GATEWAY z/OS IMS Database DB Services OTMA TM/CTL Services IMS Connect TCP/IP user-written Client WebSphere IMS TM resource adapter Application Program ICAL MPP/JMP/IFP/BMP/JBP OTMA Descriptor OTMA Descriptor
  40. 40. IMS Version 13 40 Synchronous Program Switch New capability that enhances the DL/I ICAL support – Allows an IMS application program to synchronously call and wait for a reply from another IMS application program • Within the calling program’s UOW Database IMS DB services IMS dependent region IMS TM services MPP, JMP IFP, MD BMP OTMA Application Program ICALIMS SOAP GATEWAY IMS Connect TCP/IP user-written Client WebSphere IMS TM resource adapter
  41. 41. IMS Version 13 41 Synchronous Program Switch... Highlights – An enhancement to the DL/I ICAL to invoke another IMS application • In the same IMS • In a different IMS – In a Shared Queues back-end – Across an MSC link – And synchronously receive the response back during the same UOW – IMS internally schedules the transaction initiated by the ICAL call as an OTMA transaction • Uses a new type of OTMA destination descriptor (TYPE=IMSTRAN) which has been introduced specifically for synchronous program switch support – And the target transaction can be • An IFP, MPP, MD BMP, or JMP in IMS TM or TM/DB environments MPP1 MPP4 MPP3 ICAL ICAL ICAL IMS1 MPP2 IMS X IMS2 MSC Shared Msg Queues
  42. 42. IMS Version 13 42 Synchronous Program Switch... Usage examples – Applications can issue multiple ICALs to different destination TYPEs • Synchronous callout • Synchronous program switch ICAL DEST1 ICAL TRANB TRANA IMS CTL Region IMS Connect WebSphere IMS TMRA IMS SOAP Gateway TCP/IP RYO pgm OTMA MSG-Q Destination Descriptor TYPE(IMSCON) TRANB GU IOPCB ISRT IOPCB Destination Descriptor TYPE(IMSTRAN) 1 2 3 4 5 6 7 GU, IOPCB
  43. 43. IMS Version 13 43 Synchronous Program Switch... Considerations – To use synchronous program switch in a shared queues environment, all of the participating IMS systems must be Version 13 or later and have a MINVERS value of 13.1 – New design implications • Timeout values • Transaction Expiration • Late Responses • LTERM Override • ALTPCB destinations • Multiple ICALs • Recursive requests • Holding database locks across an ICAL request – Increased importance for performance tooling
  44. 44. IMS Version 13 44 Support for Truncated Messages The RECEIVE subfunction of the DL/I ICAL is enhanced to enable applications to efficiently receive large messages that did not fit into a previously specified response area. New “RECEIVE” subfunction code can be used to get truncated message – IMS 13 keeps a copy of the entire response message in the control region private storage Benefit – Provides the ability to complete the retrieval of a reply message • Without having to re-issue a complete ICAL “SENDRECV” and associated network transmission costs
  45. 45. IMS Version 13 45 ISC Over TCP/IP ISC Over TCP/IP value proposition – New option that supports TCP/IP network connectivity for Intersystem Communication (ISC) connections • IMS – CICS Provides a strategic protocol alternative to SNA/VTAM • Allows an all inclusive TCP/IP solution for networks
  46. 46. IMS Version 13 46 ISC Over TCP/IP Highlights – Supports both static and dynamic terminals • Static terminal definitions – SYSGEN stage 1 TYPE, TERMINAL, SUBPOOL macros – DFSDCxxx PROCLIB member • Dynamic terminal specification – Logon descriptors in the DFSDSCMx or DFSDSCTy PROCLIB member – Leverages IMS Connect • Enhancements to the HWSCFGxx configuration member – No IMS Connect user message exit changes – Uses CSL to communicate between IMS and IMS Connect • Requires Structured Call Interface (SCI) and Operation Manager (OM) – Requires CICS Transaction Server for z/OS 5.1
  47. 47. IMS Version 13 47 OTMA Enhancements OTMA destination descriptor enhancements – TYPE={MQSERIES} • Provides asynchronous callout and messaging support (ISRT ALTPCB) – EXIT={YES | NO} • Specifies whether or not the OTMA exits are to be called Corresponding enhancement to IMS Type-2 OTMADESC commands – [CREATE | UPDATE | DELETE |QUERY] OTMADESC • Recovered across warm and emergency restarts Benefits – Simplifies asynchronous messaging to WMQ – Removes the need to code the OTMA exits, DFSYPRX0 and DFSYDRU0 – Provides dynamic change capability with the Type-2 commands
  48. 48. IMS Version 13 48 OTMA Enhancements OTMA early termination notification – Enhancement that allows OTMA to leave the XCF group earlier in termination processing • Allows OTMA clients (IMS Connect, WebSphere MQ, OTMA C/I) to be notified of the termination via their XCF Group Exit – Can route requests to other systems – Addresses issues associated with transactions messages being accepted but not processed – Function retrofitted to IMS 12: APAR PM73869 / PTF UK90361
  49. 49. IMS Version 13 49 Enhancements for the Non-Discardable Messages Exit Routine Customer requirement for a new function to PSTOP an abending transaction – Stops scheduling but allows queueing to continue New functions provided by for the DFSNDMX0, the Non-Discardable Messages exit routine – IMS 11 APAR PM67950 / PTF UK81040 – IMS 12 APAR PM45943 / PTF UK71989 – Included in IMS 13
  50. 50. IMS Version 13 50 Summary of IMS 13 Transaction Manager and Connectivity Topics Callout function enhancements ISC Over TCP/IP OTMA enhancements Non-Discardable Message Exit (DFSNDMX0) enhancements
  51. 51. IMS Version 13 51 IMS 13 Database and DBRC Enhancements Database Versioning HALDB Alter DEDB Alter DBRC Enhancements
  52. 52. IMS Version 13 52 Database Versioning IMS 13 allows application programs to use different versions of the same physical database – Multiple views of the physical data are maintained in the IMS catalog – Application programs can use different views of the same physical IMS database Benefit – Customers can support multiple versions of an IMS database – Physical database structure can be changed without having to modify all the exiting application programs using the database 52
  53. 53. IMS Version 13 53 Database Versioning Overview Provides the ability to assign user-defined version identifiers to different versions of an IMS database structure Enables structural changes to a database while providing multiple views of the physical IMS data to various applications Applications referencing a new physical database structure can be brought online without affecting applications that use previous database structures Applications not requiring sensitivity to the new physical database structure can continue to access the database without any modifications or recompilation 53 Can be used in conjunction with IMS 13 database ALTER functions.
  54. 54. IMS Version 13 54 Database Versioning Overview Database Versioning supports the following database types – DEDB – HDAM – HIDAM – PHDAM – PHIDAM Database Versioning supports the following structure changes to a database – For all supported database types • Increasing the length of a segment • Adding a new field to undefined space at the end of a segment – For Full-Function and HALDB database types only • Adding a new field that defines an alternative mapping of bytes in a segment 54
  55. 55. IMS Version 13 55 Database Versioning requires IMS catalog enablement – DBD version definitions must be stored in the IMS catalog • Populate catalog with DBD version definitions All systems in an IMSplex must be running IMS 13 – DBRC MINVERS value of “13.1” required Database Versioning Overview 55
  56. 56. IMS Version 13 56 Database Versioning must be enabled in DFSDFxxx DATABASE section Versioning is at the DBD level – Users define the version of a database definition on the DBD – Version numbers must be maintained in incremented values Application programs can elect the desired database version – Specifying the version number on the PCB of the PSB – Specifying the version number on a DL/I INIT VERSION call Database Versioning requires enablement of the IMS catalog – DBD definitions for versioned databases must be in the IMS catalog Database Versioning Requirements
  57. 57. IMS Version 13 57 DFSDFxxx PROCLIB: new DATABASE section keywords – Specify whether database versioning is enabled and default version • DBVERSION= • DBLEVEL= Database and Program Generation Statements – Specify the database version number • DBD: DBVER= • PCB: DBVER= – Override the default versioning specified in DFSDFxxx • PSBGEN: DBLEVEL= “INIT VERSION” DL/I Call – Overrides the version number that is specified on the PCB statement – Must be issued before issuing a DL/I DB call to the database Database Versioning Implementation
  58. 58. IMS Version 13 58 HALDB Alter IMS 13 provides ability to make structural changes to a HALDB database without a database outage – Structural changes can be made to DB segment definitions – HALDB Online Reorganization is used to apply the structural changes to the online database – Online Change process is used to activate the new ACBLIB member(s) in the online IMS system Benefit – Eliminate a database outage when structural changes must be made to segment definitions in a DBD – Improved online availability of HALDB databases 58
  59. 59. IMS Version 13 59 HALDB Alter Overview Structural changes can be made to online HALDB databases – PHDAM – PHIDAM Types of structural changes – Add a new field to space at the end of an existing segment – Define new fields that remap existing fields and space in a segment – Increase the length of an existing segment 59 A B C A CB
  60. 60. IMS Version 13 60 60 FIELD 1 FIELD 1 FIELD 2 Space FIELD 2 New FIELD 3 Add a new field to space at the end of a segment Example 1 Example 2 FIELD 1 FIELD 1 FIELD 2 FIELD 2 Space New FIELD 3 Sp. Sp.
  61. 61. IMS Version 13 61 61 FIELD 1 FIELD 1 FIELD 2 SpaceFIELD 2 Define new fields to remap existing fields in a segment Example 1 Example 2 FIELD 1 FIELD 1 FIELD 2 FIELD 2 Space Overlay FIELD 2A New FIELD 3 Overlay FIELD 2B New FIELD 3 Space Space Overlay FIELD 2A Sp. Sp.
  62. 62. IMS Version 13 62 62 FIELD 1 FIELD 1 FIELD 2 SpaceFIELD 2 Example 1 Example 2 FIELD 1 FIELD 1 FIELD 2 FIELD 2 Space Overlay FIELD 2A New FIELD 3 Overlay FIELD 2B New FIELD 3 Space Space Overlay FIELD 2A Sp. Sp. Space Space Increase the length of an existing segment
  63. 63. IMS Version 13 63 HALDB Alter Overview After changes are made to segment definitions in a DBD • Online Reorganization process is used to alter the online database from the current structure to the new structure • Type-2 INITIATE OLREORG • DB unload / reload not required • Online Change process is used to activate the changed ACBLIB members in the IMS online system • Application programs can start using the new database structure 63
  64. 64. IMS Version 13 64 HALDB Alter Prerequisites Software requirements – All systems in an IMSplex must be running IMS 13 • DBRC MINVERS value of “13.1” required – Type-2 Command environment required • Common Service Layer (CSL) – Structured Call Interface (SCI) – Operations Manager (OM) • Type-1 /INITIATE OLREORG command is not supported
  65. 65. IMS Version 13 65 DEDB Alter IMS 13 adds ability to dynamically modify a DEDB Area while the Area remains online – Alter the physical attributes of a DEDB Area – SIZE, UOW, or ROOT specifications – Change the randomizer used for a DEDB Area Benefits – Improved DEDB Area availability • Make definitional modifications without taking the Area offline • Improved management of DEDBs • Provide flexibility in implementing Area changes into the system • Eliminate system down time for DEDB definition changes
  66. 66. IMS Version 13 66 66 DEDB Alter Overview • A new DEDB Alter utility is provided to dynamically modify a DEDB database • Runs as a standard Fast Path IFP utility • DEDB Areas remain online during utility execution • A 2-stage randomizer must be used • Enables areas to be processed individually • DEDB alter does not support DEDB databases in VSO or SVSO mode • Must be unloaded with /VUNLOAD before executing Alter utility • DEDB areas to be altered must be registered to DBRC • DBRC MINVERS value in RECON for all IMS subsystems that share the DEDB area must be "13.1" or later – If SDEPS present, only the randomizer name can be changed
  67. 67. IMS Version 13 67 DBRC Enhancements Command support for HALDB Alter Command support for DEDB Alter MINVERS value of ’13.1’ must be set to use HALDB Alter, DEDB Alter, or synchronous program switch in a shared queues environment Supported Migration and Coexistence – IMS 11 to IMS 13 • Apply DBRC coexistence SPE APAR PM53134 / PTF UK80026 to IMS 11 • Allows IMS 11 to understand IMS 13 RECON records – IMS 12 to IMS 13 • Apply DBRC coexistence SPE APAR PM53139 / PTF UK80027 to IMS 12 • Allows IMS 12 to understand IMS 13 RECON records
  68. 68. IMS Version 13 68 Summary of IMS 13 Database Manager and DBRC Topics Database versioning HALDB Alter DEDB Alter DBRC enhancements
  69. 69. IMS Version 13 69 IMS 13 Highlights System – IMS CONNECT enhancements • XML Converter Enhancements • Expanded Recorder Trace Records • Reporting of overall health to Workload Manager (WLM) – Concurrent application threads – Reduced Total Cost of Ownership (TCO) – Elimination of SECURITY Macro – User Exit enhancements – JDR support for ESAF – DIAG command enhancements Database and DBRC – Database Versioning – HALDB Alter – DEDB Alter – DBRC support for HALDB Alter and DEDB Alter TM and Connectivity – Synchronous program switch – ISC TCP/IP Links – OTMA destination descriptor enhancements – and more! 69