The (R)Evolution Continues
©2013 IBM Corporation
IMS 13 Quick Look
GSE BENELUX IMS User Group Meeting June 2013 - Antwerp Belgium Steve Nathan - [email protected]
2
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
Disclaimer© Copyright IBM Corporation 2013. All rights reserved.U.S. Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
THE INFORMATION CONTAINED IN THIS PRESENTATION IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY. WHILE EFFORTS WERE MADE TO VERIFY THE COMPLETENESS AND ACCURACY OF THE INFORMATION CONTAINED IN THIS PRESENTATION, IT IS PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. IN ADDITION, THIS INFORMATION IS BASED ON IBM’S CURRENT PRODUCT PLANS AND STRATEGY, WHICH ARE SUBJECT TO CHANGE BY IBM WITHOUT NOTICE. IBM SHALL NOT BE RESPONSIBLE FOR ANY DAMAGES ARISING OUT OF THE USE OF, OR OTHERWISE RELATED TO, THIS PRESENTATION OR ANY OTHER DOCUMENTATION. NOTHING CONTAINED IN THIS PRESENTATION IS INTENDED TO, NOR SHALL HAVE THE EFFECT OF, CREATING ANY WARRANTIES OR REPRESENTATIONS FROM IBM (OR ITS SUPPLIERS OR LICENSORS), OR ALTERING THE TERMS AND CONDITIONS OF ANY AGREEMENT OR LICENSE GOVERNING THE USE OF IBM PRODUCTS AND/OR SOFTWARE.
IBM, the IBM logo, ibm.com, and IMS are trademarks or registered trademarks of International Business Machines Corporation in the United States, other countries, or both. If these and other IBM trademarked terms are marked on their first occurrence in this information with a trademark symbol (® or ™), these symbols indicate U.S. registered or common law trademarks owned by IBM at the time this information was published. Such trademarks may also be registered or common law trademarks in other countries. A current list of IBM trademarks is available on the Web at “Copyright and trademark information” at www.ibm.com/legal/copytrade.shtml
3
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
Acknowledgement
This presentation was originally prepared by Diane Goff
– IBM Advanced Technical Solutions (ATS)
Additional material is from Alison Coughtrie
– European IMS Architecture Team
4
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
Agenda
Status of IMS Versions
Prerequisites, Migration, Coexistence
System Enhancements
Transaction Manager and Connectivity Enhancements
Database and DBRC Enhancements
5
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
Introducing IMS13 – Smarter Than Ever! IMS 13 Quality Partnership Program Announced on
October 3, 2012
– Program began on December 14, 2012
– QPP participants have installed and are testing IMS 13
– General availability of IMS 13 will be announced at a later date.
Announcement Letter available on ibm.com
Current Status
– 12 customers in IMS 13 QPP in 2013
– All customers through Sandbox production
– 5 customers have IMS 13 in AD environments
– 3+ targeted for full production by GA
6
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
– Will be withdrawn from Marketing on September 9, 2013
– 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
7
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
GSE BENELUX IMS User Group Meeting – June 2013
8IMS 13 Quick Look
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
9
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
10
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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:
www.ibm.com/systems/z/hardware/
z900 machines must be at GA2 level (microcode level 3G or later)
11
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
64.0.175.0 (Sept 2008) or higher
12
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
13
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
14
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
15
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
16
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
17
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
18
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
19
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
20
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
21
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
Overall Value of IMS Connect Enhancements
Enhanced usability while providing better performance and diagnostics
Increased resiliency to Abnormal Ends (ABENDs)
Improved usability and manageability
22
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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!– 15 dependent regions - 197? (IMS 360)– 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
23
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
GSE BENELUX IMS User Group Meeting – June 2013
24IMS 13 Quick Look
Benefits of the Concurrent Thread Enhancement 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
25
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
26
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
27
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
28
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
29
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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)
30
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
31
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
32
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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 UX75915
Benefits– Simplifies management of the DRD resources
33
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
34
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
35
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
36
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
New IMS Startup Security Parameters RCLASS parameter added to DFSPBxxx in PROCLIB
– RCLASS support in DFSDCxxx PROCLIB member will remain• DFSPBxxx RCLASS parameter value will override DFSDCxxx if specified
in both
SECCNT parameter added to DFSDCxxx in PROCLIB 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)
37
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
/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
38
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
/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
39
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
40
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
IMS 13 Transaction Manager and Connectivity Enhancements Callout function enhancements ISC Over TCP/IP OTMA enhancements Non-Discardable Message Exit (DFSNDMX0)
enhancements
41
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
42
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
OTM
A TM/CTLServices
IMS
Connect
TCP/IP
user-written Client
WebSphere
IMS TM resource adapter Application
Program
ICAL
MPP/JMP/IFP/BMP/JBP
OTMADescriptor
OTMADescriptor
43
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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, JMPIFP, MD BMP
OTMA
Application Program
ICALIMS SOAP GATEWAY IMS
Connect
TCP/IP
user-written Client
WebSphere
IMS TM resource adapter
GSE BENELUX IMS User Group Meeting – June 2013
44IMS 13 Quick Look
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
SharedMsg Queues
GSE BENELUX IMS User Group Meeting – June 2013
45IMS 13 Quick Look
Synchronous Program Switch... Usage examples
– Applications can issue multiple ICALs to different destination TYPEs• Synchronous callout• Synchronous program switch
ICAL DEST1
ICAL TRANB
TRANAIMS CTL Region
IMS Connect
WebSphereIMS TMRA
IMS SOAPGateway
TCP/IPRYO pgm
OTMA
MSG-Q
Destination Descriptor
TYPE(IMSCON)
TRANB
GU IOPCB
ISRT IOPCB
Destination Descriptor
TYPE(IMSTRAN)
12
3
4
56
7
GU, IOPCB
46
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
47
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
48
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
49
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
50
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
ISC Over TCP/IP
Either IMS or CICS can initiate the request
IMS
12 3
456
INPUT INPUT Transaction
REPLY REPLY
IMSConnect
CICS
SCI TCP/IP
Initiating a CICS transaction from IMS using an ISC TCP/IP connection
INPUT
REPLY
tranOR
tran
Msg SwitchIMS
End User Processtransaction
IMS
23
4 5REPLY REPLY
IMSConnect CICS
SCI TCP/IP
Initiating an IMS transaction from CICS using an ISC TCP/IP connection
CICSEnd UserProcess
transaction
Tx.1
Tx. (Start/Retrieve)INPUT Transaction
6REPLY
51
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
52
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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 being added to IMS 12: APAR PM73869
53
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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
54
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
Summary of IMS 13 Transaction Manager and Connectivity Topics Callout function enhancements ISC Over TCP/IP OTMA enhancements Non-Discardable Message Exit (DFSNDMX0)
enhancements
55
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
IMS 13 Database and DBRC Enhancements
Database Versioning HALDB Alter DEDB Alter DBRC Enhancements
GSE BENELUX IMS User Group Meeting – June 2013
56IMS 13 Quick Look
Database Versioning Overview …
Database Versioning provides the ability to assign user-defined version identifiers to different versions of a database structure
– Enables structural changes to a database while providing multiple views of the physical IMS data to application programs
Applications referencing a new physical database structure can be brought online without affecting applications that use previous database structures
– Applications which do not require sensitivity to the new physical structure, do not need to be modified and can continue to access the database
GSE BENELUX IMS User Group Meeting – June 2013
57IMS 13 Quick Look
Database Versioning Overview
Database Versioning supports the following database types– DEDB, HDAM, HIDAM, PHDAM, PHIDAM
Can be used in conjunction with the database alter functions to keep track of different versions of the structure of a database– only supports the following database structure changes
• For all supported database types
– Increasing the length of a fixed-length segment
– Adding a new field to space at the end of a fixed-length segment
• For Full-Function and HALDB database types
– Adding new field(s) that remap existing field(s) and space at the end of a fixed-length segment
• Variable-length segments are not supported
GSE BENELUX IMS User Group Meeting – June 2013
58IMS 13 Quick Look
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
Database Versioning requires enablement of the IMS catalog
– DBD definitions for versioned databases must be in the IMS catalog
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 Requirements
GSE BENELUX IMS User Group Meeting – June 2013
59IMS 13 Quick Look
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
GSE BENELUX IMS User Group Meeting – June 2013
60IMS 13 Quick Look
HALDB Alter Overview …
Structural changes can be made to HALDB databases while the database remains online– Add a new field to space at the end of an existing segment– Increase the length of an existing segment– Define new fields that remap existing fields and space in an
existing segment– Fixed-length segments only
Benefit– Make structural changes to a database while maintaining
database availability
A
B C
A
CB
GSE BENELUX IMS User Group Meeting – June 2013
61IMS 13 Quick Look
HALDB Alter Overview
HALDB Alter is only supported for database types:
– PHDAM – PHIDAM
After changes are made to the DBD segment definition– Type-2 INITIATE OLREORG command is used to alter a
database from the current structure to the new structure
• Type-1 command /INITIATE OLREORG does not support altering a HALDB
– Online Change commands are used to bring the changed ACBLIB DBD member online
– Application programs can start using the new database structure
GSE BENELUX IMS User Group Meeting – June 2013
62IMS 13 Quick Look
Add a new field to space at the end of a segment
FIELD 1
FIELD 1
FIELD 2 Space
FIELD 2 SpaceNew
FIELD 3
Example 1
Example 2
FIELD 1
FIELD 1 FIELD 2
FIELD 2 Space
NewFIELD 3
Space
GSE BENELUX IMS User Group Meeting – June 2013
63IMS 13 Quick Look
FIELD 1
FIELD 1
FIELD 2
New SpaceFIELD 2
Increase the length of an existing segmentExample 1
Example 2
FIELD 1
FIELD 1 FIELD 2
FIELD 2
New Space
Space
Space
GSE BENELUX IMS User Group Meeting – June 2013
64IMS 13 Quick Look
HALDB Alter Prerequisites
Software requirements
– CSL
• SCI
• OM
– DBRC RECON MINVERS (‘13.1’)
GSE BENELUX IMS User Group Meeting – June 2013
65IMS 13 Quick Look
DEDB Alter
IMS 13 adds ability to dynamically change DEDB specifications ̶W Users can dynamically change UOW, SIZE, ROOT, Randomizer while
DEDB is online̶W New DEDB Alter utility is used for DEDB changes̶W DRD is not required for DEDB Alter̶W Supports VSO Areas if /VUNLOAD is done before DEDB Alter is
executed
Benefits̶W Improved management of DEDB definitions
• Eliminate system down time for modifications to DEDB definitions
• Improve data availability since changes are done while DEDB is online
GSE BENELUX IMS User Group Meeting – June 2013
66IMS 13 Quick Look
DEDB Alter Utility
The new DEDB Alter utility is used to change the following items without taking the area offline– The SIZE, UOW, or ROOT specifications of a DEDB area– The randomizer that is used for the DEDB area
Requirements– A two-stage randomizer must be used, which enables areas to be
processed individually.– DEDBs to be altered must be registered to DBRC– The MINVERS value in the RECON data set for all IMS
subsystems that share the DEDB area must be at “13.1” or later– If SDEPS present, only the randomizer name can be changed
67
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
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 to IMS 11– PTF UK80026
• Allow IMS 11 to understand IMS 13 RECON records
– IMS 12 to IMS 13• Apply DBRC coexistence SPE APAR PM53139 to IMS 12
– PTF UK80027
• Allow IMS 12 to understand IMS 13 RECON records
68
GSE BENELUX IMS User Group Meeting – June 2013
IMS 13 Quick Look
Summary of IMS 13 Database Manager and DBRC Topics
HALDB Alter
DEDB Alter
Database versioning
DBRC enhancements