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

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The sequence is as follows: 1. VSAM scans the index record in the highest level of the index set for a key that is greater or equal to 23. 2. The entry 67 points to an index record in the next lower level. In this index record, VSAM scans for an entry for a key that is higher than or equal to 23. 3. The entry 38 points to the sequence set that maps the CA holding the CI containing the logical record. 4. VSAM scans the sequence set record with the highest key, searching for a key that is greater than or equal to 23. 5. The entry 26 points to the data component CI that holds the desired record. 6. VSAM searches the CI for the record with key 23. VSAM finds the logical record and gives it to the application program. If VSAM does not find a record with the desired key, the application receives a return code indicating that the record was not found. 168 ABCs of z/OS System Programming Volume 3
4.36 VSAM entry sequenced data set (ESDS) CI 1 RBA 0 CI 2 RBA 4096 CI 3 RBA 8192 CI 4 RBA 12288 RECORD 1 RECORD 5 RECORD 9 RECORD 2 RECORD 6 RECORD 10 RECORD 3 RECORD 7 Figure 4-46 VSAM entry sequenced data set (ESDS) UNUSED SPACE RECORD 4 RECORD 8 UNUSED SPACE UNUSED SPACE UNUSED SPACE VSAM entry sequenced data set (ESDS) An entry sequenced data set (ESDS) is comparable to a sequential data set. It contains fixed-length or variable-length records. Records are sequenced by the order of their entry in the data set, rather than by a key field in the logical record. All new records are placed at the end of the data set. An ESDS cluster has only a data component. Records can be accessed sequentially or directly by relative byte address (RBA). When a record is loaded or added, VSAM indicates its relative byte address (RBA). The RBA is the offset of the first byte of the logical record from the beginning of the data set. The first record in a data set has an RBA of 0; the second record has an RBA equal to the length of the first record, and so on. The RBA of a logical record depends only on the record's position in the sequence of records. The RBA is always expressed as a full-word binary integer. Although an entry-sequenced data set does not contain an index component, alternate indexes are allowed. You can build an alternate index with keys to keep track of these RBAs. Chapter 4. Storage management software 169 R D F R D F R D F R D F R D F R D F R D F R D F C I D F C I D F C I D F C I D F
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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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Page 136 and 137: 4.8 IEBGENER: Copying data to tape
Page 138 and 139: 4.10 IEHLIST LISTVTOC output CONTEN
Page 140 and 141: Examples of IEHINITT In the example
Page 142 and 143: 4.13 DFSMSdfp access methods DFSMSd
Page 144 and 145: physical blocks. QSAM also guarante
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Page 148 and 149: Command Functions DEFINE PAGESPACE
Page 150 and 151: Note: These commands cannot be used
Page 152 and 153: ► Capacity planning: Capacity pla
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Page 156 and 157: The parameters are: NAME This speci
Page 158 and 159: 4.21 Relative generation numbers A.
Page 160 and 161: 4.23 PDS data set organization Adva
Page 162 and 163: 4.24 Partitioned data set extended
Page 164 and 165: 4.25 PDSE enhancements PDSE, two ad
Page 166 and 167: 4.26 PDSE: Conversion Using DFSMSds
Page 168 and 169: 4.27 Program objects in a PDSE Func
Page 170 and 171: 4.28 Sequential access methods Sequ
Page 172 and 173: 4.29 z/OS V1R9 QSAM - BSAM enhancem
Page 174 and 175: 4.30 Virtual storage access method
Page 176 and 177: 4.31 VSAM terminology Logical recor
Page 178 and 179: 4.32 VSAM: Control interval (CI) LR
Page 180 and 181: 4.33 VSAM data set components Clust
Page 182 and 183: 4.34 VSAM key sequenced cluster (KS
Page 186 and 187: 4.37 VSAM: Typical ESDS processing
Page 188 and 189: 4.39 VSAM: Typical RRDS processing
Page 190 and 191: 4.41 VSAM: Data-in-virtual (DIV) DI
Page 192 and 193: 4.43 VSAM resource pool VSAM resour
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Page 200 and 201: 4.47 VSAM SMB enhancement with z/OS
Page 202 and 203: 4.48 VSAM enhancements Data compres
Page 204 and 205: 4.50 Data set separation syntax Dat
Page 206 and 207: 4.51 Data facility sort (DFSORT) Pa
Page 208 and 209: 4.52 z/OS Network File System (z/OS
Page 210 and 211: 4.53 DFSMS optimizer (DFSMSopt) Fig
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Page 214 and 215: 4.55 DFSMSdss: Physical and logical
Page 216 and 217: When to use logical processing Use
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Page 220 and 221: 4.59 Hierarchical Storage Manager (
Page 222 and 223: Tasks for availability management f
Page 224 and 225: - Release of unused, over-allocated
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Page 228 and 229: DATASSETSIZE(dssize) This specifies
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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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Recover from performance slow downs
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2. Define or alter your existing ca
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7.1 VSAM share options Share option
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7.2 Base VSAM buffering Three types
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7.3 Base VSAM locking Figure 7-3 Ex
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7.5 VSAM record-level sharing intro
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► Non-CICS jobs can have read-onl
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7.8 Buffering under VSAM RLS CICS R
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7.9 VSAM RLS locking control interv
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7.10 VSAM RLS/CICS data set recover
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7.11 Transactional recovery Commite
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7.13 VSAM RLS implementation Update
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Cache structures Coupling Facility
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7.15 Update PARMLIB with VSAM RLS p
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7.16 Define sharing control data se
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Tip: Place the SHCDSs on separate v
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Command ===> Figure 7-22 CF cache u
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7.18 Update data sets with log para
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7.19 The SMSVSAM address space RLS
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7.20 Interacting with VSAM RLS Inte
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To learn about other DISPLAY comman
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to use this specification or the sp
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► RECOVERY REQUIRED This field in
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DFSMStvs is a follow-on project/cap
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Like CICS, DFSMStvs does not perfor
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It is RRS that provides the means t
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7.27 Unit of work and unit of recov
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► Log of logs (optional, shared w
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7.30 Application considerations Bre
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7.31 DFSMStvs logging implementatio
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LABEL JOB ... //STEP10 EXEC PGM=IXC
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7.33 Update PARMLIB with DFSMStvs p
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7.34 The DFSMStvs instance CICSA R/
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Changes to parameters other than AK
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7.36 Summary Figure 7-48 Summary Ba
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8.1 Overview of DASD types Traditio
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8.2 Redundant array of independent
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8.3 Seascape architecture Powerful
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► Data copy sharing Data copy sha
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NVS cache NVS is used to store a se
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8.6 ESS major components Figure 8-6
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8.8 FICON host adapters FICON host
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8.9 ESS disks Eight-packs Set of 8
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8.10 ESS device adapters SSA 160 De
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8.11 SSA loops SSA operation 4 link
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8.12 RAID-10 RAID-10 configurations
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8.13 Storage balancing with RAID-10
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Peer-to-peer remote copy (PPRC) PPR
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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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