ABCs of z/OS System Programming Volume 3 - IBM Redbooks

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It is RRS that provides the means to implement two-phase commit, but a resource manager must also use registration services and context services in conjunction with resource recovery services. Two-phase commit The two-phase commit protocol is a set of actions used to make sure that an application program either makes all changes to the resources represented by a single unit of recovery (UR), or it makes no changes at all. This protocol verifies that either all changes or no changes are applied even if one of the elements (such as the application, the system, or the resource manager) fails. The protocol allows for restart and recovery processing to take place after system or subsystem failure. For a discussion of the term unit of recovery, see 7.27, “Unit of work and unit of recovery” on page 426. 424 ABCs of z/OS System Programming Volume 3
7.26 Atomic updates Before After Before After $200 $100 -$100 +$100 $700 $800 Transaction to transfer $100 Figure 7-35 Example of an atomic update $200 $200 +$100 $700 $800 Incomplete transaction Atomic updates A transaction is known as atomic when an application changes data in multiple resource managers as a single transaction, and all of those changes are accomplished through a single commit request by a sync point manager. If the transaction is successful, all the changes are committed. If any piece of the transaction is not successful, then all changes are backed out. An atomic instant occurs when the sync point manager in a two-phase commit process logs a commit record for the transaction. Also see 7.11, “Transactional recovery” on page 394 for information about recovering an uncompleted transaction. Chapter 7. DFSMS Transactional VSAM Services 425
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ibm.com/redbooks Front cover ABCs o
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Note: Before using this information
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3.10 Data sets eligible for EAV vol
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5.5 Implementing SMS policies. . .
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7.29 Accessing a data set with DFSM
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Trademarks IBM, the IBM logo, and i
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Paul Rogers is a Consulting IT Spec
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xiv ABCs of z/OS System Programming
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1.1 Introduction to DFSMS IBM 3494
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Network File System The Network Fil
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Using access methods, commands, and
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Distributed data management DFSMSds
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Shelf management DFSMSrmm groups in
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Availability management DFSMShsm ba
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key functions that enable multiple
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An access method is a DFSMSdfp comp
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including the operating system itse
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2.3 DFSMSdfp data set types Data se
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2.4 Types of VSAM data sets Types o
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Partitioned data set (PDS) Partitio
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► Extended-addressability, which
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method writes data on the first vol
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SMS calculates the average preferen
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Restriction: The following types of
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► REXX LISTDSI function ► CLIST
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Using CLIST OPENFILE INPUT/GETFILE
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2.12 z/OS UNIX files Following are
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Logical records and blocks To an ap
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2.14 Locating an existing data set
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2.15 Uncataloged and cataloged data
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2.17 VTOC and DSCBs VTOC DSCBs Figu
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2.18 VTOC index structure VOLUME LA
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2.19 Initializing a volume using IC
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52 ABCs of z/OS System Programming
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3.1 Traditional DASD capacity 885 C
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Large volume support design conside
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DASD virtual visibility Traditional
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3.4 WLM controlling PAVs zSeries WL
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3.5 Parallel Access Volumes (PAVs)
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3.6 HyperPAV feature for DS8000 ser
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For each z/OS image within the sysp
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Note: With the 3390 Model A, the mo
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Note the following points regarding
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EAS non-eligible data sets An EAS-i
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same as for previous 3390 model dev
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3.13 Using dynamic volume expansion
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3.15 Using Web browser GUI Need a U
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3.17 Increase capacity of volumes F
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3.19 Final capacity increase for vo
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VTOC index changes The index block
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The documentation is in Device Supp
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free space available following the
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Note: The refresh of the index occu
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Updating the VTOC following volume
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USEEAV(YES|NO) YES This means that
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Generally, for VSAM data set alloca
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attributes can reside in the extend
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Other methods for EATTR specificati
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3.30 Migration assistance tracker T
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3.31 Migration tracker commands SET
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4.1 Overview of DFSMSdfp utilities
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4.2 IEBCOMPR utility Example 1 Exam
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4.3 IEBCOPY utility //COPY JOB ...
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4.4 IEBCOPY: Copy operation DATA.SE
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4.5 IEBCOPY: Compress operation DAT
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Copying to z/OS UNIX IEBGENER can b
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4.8 IEBGENER: Copying data to tape
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4.10 IEHLIST LISTVTOC output CONTEN
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Examples of IEHINITT In the example
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4.13 DFSMSdfp access methods DFSMSd
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physical blocks. QSAM also guarante
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The automatic class selection (ACS)
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Command Functions DEFINE PAGESPACE
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Note: These commands cannot be used
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► Capacity planning: Capacity pla
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A GDS has sequentially ordered abso
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The parameters are: NAME This speci
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4.21 Relative generation numbers A.
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4.23 PDS data set organization Adva
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4.24 Partitioned data set extended
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4.25 PDSE enhancements PDSE, two ad
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4.26 PDSE: Conversion Using DFSMSds
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4.27 Program objects in a PDSE Func
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4.28 Sequential access methods Sequ
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4.29 z/OS V1R9 QSAM - BSAM enhancem
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4.30 Virtual storage access method
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4.31 VSAM terminology Logical recor
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4.32 VSAM: Control interval (CI) LR
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4.33 VSAM data set components Clust
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4.34 VSAM key sequenced cluster (KS
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The sequence is as follows: 1. VSAM
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4.37 VSAM: Typical ESDS processing
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4.39 VSAM: Typical RRDS processing
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4.41 VSAM: Data-in-virtual (DIV) DI
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4.43 VSAM resource pool VSAM resour
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► CIs are discarded as soon as th
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SMB processing techniques If all of
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MSG=SMBBIAS When you specify MSG =
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4.47 VSAM SMB enhancement with z/OS
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4.48 VSAM enhancements Data compres
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4.50 Data set separation syntax Dat
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4.51 Data facility sort (DFSORT) Pa
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4.52 z/OS Network File System (z/OS
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4.53 DFSMS optimizer (DFSMSopt) Fig
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4.54 Data Set Services (DFSMSdss) /
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4.55 DFSMSdss: Physical and logical
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When to use logical processing Use
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When to use physical processing Use
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4.59 Hierarchical Storage Manager (
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Tasks for availability management f
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- Release of unused, over-allocated
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usually slower response time. Usual
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DATASSETSIZE(dssize) This specifies
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► Utilize OVERFLOW volumes for mi
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Before automatic secondary space ma
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For data sets larger than 58 K trac
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► Migration level 1 (ML1) volumes
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value of a user-specified RETPD or
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The second-newest version is treate
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If the version has a specified rete
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ACS routines For both automatic and
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- System-managed automated tape lib
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4.75 What DFSMSrmm can manage Remov
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You can also use the DFSMSrmm built
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z/OS V1R8 enhancements DFSMSrmm hel
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5.1 Storage management ISMF dss Fig
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5.3 Goals and benefits of system-ma
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Improved data availability manageme
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► Whether data sets are to be kep
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When the ACS routines are started a
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5.7 Assigning data to be system-man
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Even though data class is optional,
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You can use the ACCESSIBILITY attri
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If you do not explicitly assign a m
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5.12 Using storage groups DFSMShsm-
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5.13 Using aggregate backup and rec
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5.14 Automatic Class Selection (ACS
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5.15 SMS configuration An SMS confi
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5.16 SMS control data sets SMS Figu
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5.17 Implementing DFSMS Enabling th
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► Gain experience with the operat
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Specify SHAREOPTIONS(3,3) for the A
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Defining the SMS base configuration
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5.21 Creating ACS routines Storage
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5.22 DFSMS setup for z/OS IEASYSxx
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5.23 Starting SMS and activating a
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5.24 Control SMS processing with op
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5.25 Displaying the SMS configurati
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exception. If it is clear that a PD
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sets (see Figure 5-27 on page 287).
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Using a high level qualifier (HLQ)
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5.30 Establishing installation stan
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5.32 Data class attributes Data cla
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5.34 Simplifying JCL use Figure 5-3
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► The AVGREC attribute indicates
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Considerations when specifying spac
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5.38 SMS PDSE support SMS PDSE supp
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5.40 Allocating new PDSEs //ALLOC E
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Production batch refers to data cre
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tape are stored as a tape data set
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5.44 ISMF: Product relationships IS
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5.45 ISMF: What you can do with ISM
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5.46 ISMF: Accessing ISMF Panel Hel
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5.48 ISMF: Obtaining information ab
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5.49 ISMF: Data set option Figure 5
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5.51 ISMF: Management Class option
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5.53 ISMF: Storage Class option Fig
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6.1 Catalogs ICF structure 1 ICF st
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6.2 The basic catalog structure (BC
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6.3 The VSAM volume data set (VVDS)
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6.4 Catalogs by function SYSCAT VOL
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User catalogs The difference betwee
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Multilevel aliases You can augment
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Defining a cataloged data set When
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The example in Figure 6-9 on page 3
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6.8 Using multiple catalogs CATALOG
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If you need to share data sets acro
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► List a user catalog connector i
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Note: When you delete a data set, t
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DELET6 JOB ... //STEP1 EXEC PGM=IDC
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Note: The command will result in er
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You can later recover the backup co
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Aliases to the catalog can be defin
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► Physical errors The records on
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Because APF authorization is establ
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3. Use EXAMINE and DIAGNOSE to ensu
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5. Use REPRO MERGECAT to split the
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The two types of buffer are used to
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Catalog report output This MODIFY c
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Restarting the catalog address spac
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► MODIFY CATALOG,LIST The LIST co
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Page 392 and 393: 2. Define or alter your existing ca
Page 394 and 395: 7.1 VSAM share options Share option
Page 396 and 397: 7.2 Base VSAM buffering Three types
Page 398 and 399: 7.3 Base VSAM locking Figure 7-3 Ex
Page 400 and 401: 7.5 VSAM record-level sharing intro
Page 402 and 403: ► Non-CICS jobs can have read-onl
Page 404 and 405: 7.8 Buffering under VSAM RLS CICS R
Page 406 and 407: 7.9 VSAM RLS locking control interv
Page 408 and 409: 7.10 VSAM RLS/CICS data set recover
Page 410 and 411: 7.11 Transactional recovery Commite
Page 412 and 413: 7.13 VSAM RLS implementation Update
Page 414 and 415: Cache structures Coupling Facility
Page 416 and 417: 7.15 Update PARMLIB with VSAM RLS p
Page 418 and 419: 7.16 Define sharing control data se
Page 420 and 421: Tip: Place the SHCDSs on separate v
Page 422 and 423: Command ===> Figure 7-22 CF cache u
Page 424 and 425: 7.18 Update data sets with log para
Page 426 and 427: 7.19 The SMSVSAM address space RLS
Page 428 and 429: 7.20 Interacting with VSAM RLS Inte
Page 430 and 431: To learn about other DISPLAY comman
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Page 434 and 435: ► RECOVERY REQUIRED This field in
Page 436 and 437: DFSMStvs is a follow-on project/cap
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Page 442 and 443: 7.27 Unit of work and unit of recov
Page 444 and 445: ► Log of logs (optional, shared w
Page 446 and 447: 7.30 Application considerations Bre
Page 448 and 449: 7.31 DFSMStvs logging implementatio
Page 450 and 451: LABEL JOB ... //STEP10 EXEC PGM=IXC
Page 452 and 453: 7.33 Update PARMLIB with DFSMStvs p
Page 454 and 455: 7.34 The DFSMStvs instance CICSA R/
Page 456 and 457: Changes to parameters other than AK
Page 458 and 459: 7.36 Summary Figure 7-48 Summary Ba
Page 460 and 461: 444 ABCs of z/OS System Programming
Page 462 and 463: 8.1 Overview of DASD types Traditio
Page 464 and 465: 8.2 Redundant array of independent
Page 466 and 467: 8.3 Seascape architecture Powerful
Page 468 and 469: ► Data copy sharing Data copy sha
Page 470 and 471: NVS cache NVS is used to store a se
Page 472 and 473: 8.6 ESS major components Figure 8-6
Page 474 and 475: 8.8 FICON host adapters FICON host
Page 476 and 477: 8.9 ESS disks Eight-packs Set of 8
Page 478 and 479: 8.10 ESS device adapters SSA 160 De
Page 480 and 481: 8.11 SSA loops SSA operation 4 link
Page 482 and 483: 8.12 RAID-10 RAID-10 configurations
Page 484 and 485: 8.13 Storage balancing with RAID-10
Page 486 and 487: Peer-to-peer remote copy (PPRC) PPR
Page 488 and 489: 8.15 ESS performance features Prior
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8.16 IBM TotalStorage DS6000 Enterp
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DS6000 expansion enclosure (Model 1
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support for one or two expansion fr
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The DS8300 models can support eithe
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consolidations where separate stora
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Copy Services include the following
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TotalStorage Expert helps storage a
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identifying the data set and descri
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Table 8-4 Types of labels Code Mean
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equired. Therefore, the resulting t
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Drive designed for automation solut
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3494 models and features IBM 3494 o
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Each FICON channel in the VTS can s
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In addition to the 3494 VTS compone
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► Consolidation Another benefit i
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Online resources ► z/OS DFSMShsm
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ABCs of z/OS System Programming Vol
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