Tech Ideas – an Initiative from Gifts2DOOR.com

SECTION 4

Answer the following briefly:

1. Differentiate between Control Interval and Control Area.

2. How many bytes of control information are there if all records are of the same length?Specify the number of bytes used by RDFs and CIDFs.

3. Differentiate between Direct and Sequential processing.

4. What types of data sets are supported by VSAM?

5. What is a cluster?

6. Specify the default action of VSAM if the specified CISZ is not valid in defining the cluster.

7. How are records stored in each type of VSAM data set?

8. What is the function performed by VSAM ALTER?

9. What is the difference between a user catalog and a master catalog?

10. How do you specify the amount of CI to be used?

11. How do you specify the amount of CA available to a file?

12. Explain the need for free space.

13. What does it imply, if FSPC(100 100) is specified in DEFINE CLUSTER command?

14. What is AMS? How are its services invoked?

15. Describe the various levels of password protection.

16. What is the format of SHAREOPTIONS and why is it used?

17. In what manner the VSAM data sets can be shared with SHAREOPTION(2 3)?

18. Mention some of the important types of information that can be obtained from LISTCAT.

19. How can you check the amount of free space available for a data set?

20. How can we obtain the status of a master catalog or a user catalog?

21. What is a VSAM model?

22. What is a reusable data set?

23. What is the function performed by VSAM REPRO?

24. What is the effect of REUSE with REPRO?

25. What is the effect of REPLACE with REPRO?

26. What is the function performed by PRINT?

27. What is a data class?

28. Mention some of the JCL parameters used for VSAM.

29. How can you view the contents of a Data Class?

30. Differentiate between logical record access and control interval access.

31. Differentiate between MOVE mode and LOCATE mode.

32. What happens when a VSAM data set is requested for OPEN?

33. What is AMP and when would you use it?

34. What is IIP and when is it used?

35. Mention some of the COBOL procedure division verbs used for processing a VSAM data set.

36. What are the limitations of COBOL in processing a VSAM data set?

37. How can a VSAM data set be shared within a region?

38. What is the effect of SPEED/RECOVERY with DEFINE CLUSTER?

39. What is the purpose of VERIFY command?

40. What is the effect of ERASE/NOERASE with DELETE CLUSTER?

41. What is an USVR? What are its functions?

42. What is the purpose of free space?

43. What function is performed by IMBED parameter?

44. What function is performed by REPLICATE parameter?

45. What is the purpose of buffer space?

46. Explain the terms front and rear key compressions.

47. Explain the need for an alternate index.

48. What is a PATH?

49. What functions does the UPGRADE option do?

50. What is the function of BLDINDEX?

51. What are the various utilities available for backing up of data and restoring it?

52. Why do we go for reorganizing a KSDS?

53. What are the effects of reorganization of a KSDS?

54. What is control interval ?

55. What is KSDS, ESDS,RRDS ?

56. What is VERIFY on VSAM file ?

VSAM

1.What are the different types of VSAM files available?

KSDS: Key Sequence Data Set

ESDS: Entry Sequence Data Set

RRDS: Relative Data Set

2.What is IDCAMS ?

IDCAMS is the Access Method Services program. You run the IDCAMS program and supply AMS commands thru SYSIN. (examples of AMS commands are DELETE, DEFINE, REPRO etc..).

3.Can AMS commands be run from the TSO prompt ?

Yes

4.Syntax of AMS modal commands ?

Note: these can be used only under IDCAMS and not from the TSO prompt.

IF LASTCC(or MAXCC) >(or <,= etc..) value -

THEN -

DO -

command set (such as DELETE, DEFINE etc..)

ELSE -

DO -

command set

LASTCC – Condition code from the last function(such as delete) executed

MAXCC – Max condition code that was returned by any of the prev functions

SET is also a valid AMS command. SET LASTCC (or MAXCC) = value

The maximum condition code is 16. A cond code of 4 indicates a warning. A cond code of 8 is usually encountered on a DELETE of a dataset that is not present.

5.Under IDCAMS , multiple functions can be executed, each of which returns a cond code. What will be the condition code returned to the operating system ?

The maximum condition code generated is returned as the condition code of the IDCAMS step.

6.What is Control Interval, Control Area

Control Interval is analogous to a physical block for QSAM files. It is the unit of i/o. Must be between 512 bytes to 32 k. Usually either 2K or 4K. A larger control interval increases performance for sequential processing while the reverse is true for random access. Under CICS when a record is locked, the entire CI gets locked.

Control area is a group of control intervals. CA is used during allocation. CA size is calculated based on the allocation type (cyl, tracks or records) and can be max of 1 cylinder

7.What is FREESPACE ?

Coded in the DEFINE as FREESPACE(ci ca) where ci is the percentage of each control interval to be left free for insertions, ca is the percentage of control intervals in each control area to be left empty.

8.How do you decide on optimum values for CI, FREESPACE etc…

CI size should be based on record length, type of processing. Usually CI is 4K. If record length is larger(>1K), chose 6K or 8K.

FREESPACE should be large if more number of insertions are envisaged. Usual values are (20 20) when heavy updates are expected. CI size can be calculated.

9.Would you specify FREESPACE for an ESDS?

No. Because you cannot insert records in an ESDS, also when you rewrite a record, it must be of the same length. Thus putting any value for freespace does not make any sense.

10.What is SHAREOPTS ?

SHAREOPTS is a parameter in the DEFINE and specifies how an object can be shared among users. It is coded as SHAREOPTS(a b), where a is the cross region share option ie how two or more jobs on a single system can share the file, while b is the cross system share option ie how two or more jobs on different MVSes can share the file. Usual value is (2 3).

11.What is the meaning of each of the values in SHAREOPTS(2 3)?

Value of 2 for cross region means that the file can be processed simultaneously by multiple users provided only one of them is an updater. Value of 3 for cross system means that any number of jobs can process the file for input or output (VSAM does nothing to ensure integrity).

12.How do you define a KSDS ?

DEFINE CLUSTER(cluster name) with the INDEXED parameter. Also specify the ds name for the DATA component & the ds INDEX component. Other important parms are RECORDSIZE, KEYS, SHAREOPTIONS.

13.How do you define an ALTINDX ? How do you use ALTINDXs in batch, CICS pgms ?

DEFINE ALTERNATEINDEX. Important paramters are RELATE where you specify the base cluster name, KEYS, RECORDSIZE,SHAREOPTIONS,UNIQUEKEY(or NONUNIQUEKEY), DATA(ds name for the data component), INDEX(ds name for the index component).

Then DEFINE PATH. Important paramters are NAME (ds name for the path), PATHENTRY (ds name of the alternate index name), UPDATE(or NOUPDATE) which specifies whether an alt index is updated when a update to the base cluster takes place.

Then BLDINDEX. Parameters are INDATASET(ds name of base cluster), OUTDATASET(ds name of AIX).

Using alternate indexes in batch pgms:

In the JCL, you must have DD stmts for the cluster and for the path(s). In the cobol pgm, SELECT .. ASSIGN TO ddname for base cluster RECORD KEY IS… ALTERNATE RECORD KEY IS..

Using alternate indexes in CICS pgms:

FCT entries must be created for both base cluster & the path. To read using the alternate index, use the dd name of the path in CICS file control commands.

14.What happens when you open an empty VSAM file in a COBOL program for input?

A VSAM file that has never contained a record is treated as unavailable. Attempting to open for input will fail. An empty file can be opened for output only. When you open for output, COBOL will write a dummy record to the file & then delete it out.

15.How do you initialize a VSAM file before any operation? a VSAM with alternate index?

Can write a dummy program that just opens the file for output & then closes it.

16.What does a file status of 02 on a VSAM indicate?

Duplicate alternate key . Happens on both input and output operation

17.How do you calculate record size of an alternate cluster? Give your values for both unique and non-unique.

Unique Case: 5 + ( alt-key-length + primary-key )

Nonunique Case: 5 + ( alt-key-length + n * primary-key )

where n = # of duplicate records for the alternate key

???? Ramesh – can you explain ?

18.What is the difference between sequential files and ESDS files?

Sequential(QSAM) files can be created on tape while ESDS files cannot.

Also, you can have ALTINDEX for an ESDS while no such facility exists for QSAM files.

19.How do you load a VSAM data set with records ?

Using the REPRO command.

20.How do you define a GDG ?

Use the DEFINE GENERATIONDATAGROUP command. In the same IDCAMS step, another dataset must be defined whose DCB parameters are used when new generations of the GDG are created. This dataset is known as the model dataset. The ds name of this model dataset must be the same as that of the GDG, so use a disp of keep rather than catlg and also specify space=(trk,0)

21.Do all versions of the GDG have to be of the same record length ?

No, the DCB of the model dataset can be overridden when you allocate new versions.

22.How are different versions of GDG named ?

base-file-name.GnnnnnV00 where nnnn= generation number (upto 255).

nnnn will be 0000 for the 1st generation.

23.Suppose 3 generations of a GDG exist. How would you reference the 1 st generation in the JCL? -

Use GDG name(-2).

24.Suppose a generation of GDG gets created in a particular step of a proc. How would you refer the current generation in a subsequent step? What would be the disposition of this generation now? -

Relative generation numbers are updated only at the end of the job, not at the end of a step. To allocate a new generation, we would be using (+1) with a DISP of (NEW,CATLG,DELETE). To refer to this in a subsequent step in the same job, we would again use (+1) but with a DISP of SHR or OLD.

25.What more info you should give in the DD statement while defining the next generation of a GDG? -

Give (+1) as the generation number, give (new,catlg) for disp, give space parameter, can give the dcb parameter if you want to override the dcb of the model dataset.

26.Assuming that the DEFINE jcl is not available, how do you get info about a VSAM file’s organisation ?

Use the LISTCAT command.

27.During processing of a VSAM file, some system error occurs and it is subsequently unusable . What do you do ?

Run VERIFY.

VIRTUAL STORAGE ACCESS METHOD

DBT Adivosor to tune vsam definitions ci size and freespace requirements

DataPacker/VSAM —BMC DASD savings up to 80%

AMP PARM

AMP = (BUFNI (# I/O BUFFERS), bufnd # 1/0S TO BE PROCESSED)

DELETE

DEFINE CLUSTER

NAME

INDEXED

KEYS

FREESPACE FREE BYTES (X,Y) X = % OF fb IN ci/y= %ci/ca

RECORDSIZE

SHAREOPTIONS (3 3)

SPEED

NOIMBED

UNIQUE

NOERASE

NOWRITECHECK

NOREPLICATE

NONSPANNED

SHARE

DATA

NAME

CONTROLINTERVALSIZE(4096)

CYLINDERS

OWNER

VOLUMES(* * *)

21

INDEX

SAME AS DATA/NO OWNER

SET MAXCC = 0 AT LOAD,COND=(0,ne)

ALTERNATE INDEX

DEFINE AIX

NAME

FREESPACE

KEYS

OWNER

RECORDSIZE

RELATE

SHAREOPTIONS (2 3)

UNPGRADE

NUNQK

DATA

NAME

CISZ

VOLUMES

INDEX

NAME/CYL/VOLUMES

BLDINDEX INDATASET/OUTDATASET

DEFINE PATH NAME/PATHENTRY

DEFINE A RELATIONSHIP BETWEEN AN ALTERNATE INDEX AND ITS BASE CLUSTER

LISTCAT

AMS ACCESS METHOD SERVICES IDCAMS UTILITY

DEFINE/REPRO/PRINT/LISTCAT

VIRTUAL STORAGE ACCESS METHOD

ORGANIZATIONS:

ESDS ENTRY SEQUENCED DATA SET LOADED IN SEQ

LOGS/JOURNALS OR rba RELATIVE BLOCK ACCESS

KSDS KEY SEQUENCED DATA SET INDEXED

MOST

RRDS RELATIVE RECORD DATA SET RECORD LOACATION

RELATIVE TO

START OF DATASET

RRN RELATIVE RECORD NUMBER

FILE MAINTENANCE, DATA PORTABILITY, DATA SECURITY

ALTERNATE INDEX EXAMPLE

ACCOUNT/TELEPHONE

DELETE

DEFINE ALTERNATEINDEX

DEFINE PATH/PATHENTRY

BLDINDEX

IMPROVE KSDS/VSAM

PLACE INDEX AND DATA ON A SEPARATE PACK

USE IMBED OPTION TO STORE SEQUENCE SET RECORD FOR EACH CA

ASSIGNMENT OF FREE SPACE

STORAGE DATE COMPONENTS ON MULTIPLE VOLUMES

USE dbt ADVISOR TO TUNE vsam FILE DEFINTIONS, I.E. cisize AND freeSPACE

UsE STROBE TO ANALYZE CPU USAGE

22

Vsam ASSIST FOR REORGS

VERIFY IF A PROGRAM ABENDS IN MIDDLE OF PROCESSING FILE AY REMAIN OPEN

IDCAMS/CLUSTER

RECORDS/VOLUME/KEY

SHAREOPTION

CROSS SYSTEM/REGION SHARING

CI CONTROL INTERVAL CONTINUOUS AREAS OF AUXILIARY STORAGE

WHERE RECORDS RESIDE

CA CONTROL AREA

VSAM I/O PLUS VIOCTL DD CARD ADDED TO CALCULATE BUFFER AREAS AND

TRANSMITTING DATA AND INDEX CONTROL INTERVALS BETWEEN VRITUAL AND AUX

STORAGE

SECTION 3

Choose the correct answer:

1) Which VSAM clusters support only fixed length records? (b)

a LDS

b RRDS

c ESDS

d KSDS

2) FREESPACE can be specified for which type of cluster? (d)

a LDS

b RRDS

c ESDS

d KSDS

3) In which cluster type are records added at the end of the data set? (c)

a LDS

b RRDS

c ESDS

d KSDS

4) The types of processing supported by RRDS are (e)

a sequential

b skip-sequential

c direct

d a and b

e a, b and c

5) The types of processing supported by ESDS are (d)

a sequential

b skip-sequential

c direct

d a and b

e a and c

6) Spanned records can be found in (d)

a ESDS

b KSDS

c RRDS

d a or b

e a or c

7) Spanned records can be accessed in (a)

a MOVE

b LOCATE

c a and b

d None

Alternate Index is a special type of (a)

a KSDS

b ESDS

c RRDS

d None

9) Specifying CISZ(4096) at the cluster level for a KSDS results in (c)

a VSAM ignoring the specification

b Data and index CISZ 4k each

c Data CISZ 4k; index CISZ selected by VSAM

d Index CISZ 4K; data CISZ selected by VSAM

10) When defining a KSDS, which of the following parameters is not required? (b)

a Space allocation (either CYL, REC or TRK)

b VOLUMES

c KEYS

d NAME

11) Default RECORD SIZE for a NONSPANNED data set is (d)

a (80 80)

b (4086 32600)

c (100 32600)

d (4089 4089)

12) If the key of a KSDS record begins in the second field (first field is 25 bytes long), the offset in the

KEYS parameter is (a)

a 24

b 25

c 26

d None

13) Data organization in KSDS is (a)

a INDEXED

b NUMBERED

c LINEAR

d NONINDEXED

14) The default cluster type is (d)

a ESDS

b RRDS

c LDS

d KSDS

15) VOLUMES parameter can be specified at (c)

a cluster level

b data level and index level

c All the above

d None

16) The RECORDSIZE parameter cannot be coded for (c)

a ESDS

b RRDS

c LDS

d KSDS

17) The default PRINT format is (b)

a Character

b Dump

c Hexadecimal

d None

18) Which of the following REPRO selection parameters can be specified for an LDS? (e)

a FROMKEY

b FROMADDRESS

c FROMNUMBER

d SKIP

e None

19) The REPLACE parameter causes (c)

a KSDS records to be replaced by an input record with the same key

b ESDS records to be replaced by an input record with the same RBA

c RRDS records to be replaced by an input record with the same RRN

d a and c

e All the above

20) Which of the following is not a modal command? (e)

a IF

b THEN

c ELSE

d DO

e GOTO

21) Using REPRO to reorganize a KSDS, which of the following is true? (e)

a Input must be ascending key sequence.

b No duplicate keys are allowed.

c Non-unique keys are allowed.

d a and c

e a and b

22) Which of the following entry names are valid for ALTER FREESPACE? (b)

a Cluster name

b Data component name

c Index component name

d b and c

e a, b and c

23) Which of the following is a correct generic name specification for TEST.USER.DATA.A? (a)

a TEST.USER.*

b TEST.*.*.A

c *.USER.DATA.A

d TEST.USER.*.A

24) To alter a cluster to an LDS, the cluster must (e)

a be an ESDS

b be NONSPANNED

c have a CISZ of 4K

d not have an alternate index associated with it

e all the above

25) For which access mode below must the application program interpret RDFs? (b)

a KEY

b ADR

c ADR(for a KSDS)

d CNV

e None

26) At OPEN, VSAM determines processing options in the following order (d)

a JCL, program, catalog

b program, JCL, catalog

c JCL, catalog, program

d catalog, program, JCL

e None

27) VSAM request macros (e.g., GET, PUT) point to which other macros? (c)

a OPEN

b ACB

c RPL

d CLOSE

e b and c

f None

28) If a program uses direct processing exclusively, DIR is specified in which macros? (c)

a OPEN

b ACB

c RPL

d CLOSE

e b and c

f None

29) VSAM processing options could be specified in (e)

a Catalog

b Program control blocks

c JCL

d None

e All the above

30) Which of the following is not a COBOL verb? (d)

a START

b READ

c DELETE

d UPDATE

e REWRITE

31) Which of the following is/are not supported by COBOL? (d)

a Skip-sequential processing

b RBA addressing

c Replacing existing record

d a and b

e a, b and c

f a and c

32) Which is a valid SHAREOPTIONS specification? (b)

a SHR(2 2)

b SHR(2 3)

c SHR(4 1)

d SHR(1 2)

e None

33) For a data set defined with SPEED, which of the following is true? (a)

a SPEED is effective for the initial load only.

b SPEED is effective for all additions to the data set after initial load.

c If the load program ABENDS, VERIFY can determine the HIGH-USED-RBA of the data set.

d If the load program ABENDS, only those records remaining in buffers need to be added to the data set.

e None

34) VERIFY cannot be used for (c)

a Empty data set

b LDS

c a and b

d None

35) For a data set defined with NOERASE, which of the following is not true? (a)

a Desirable for sensitive data

b Removes catalog entries

c All the above

d None

36) Buffer space cannot be specified in which of the following? (d)

a DD statement

b Assembler program

c AMS DEFINE

d COBOL program

37) How many data buffers are required for sequential processing to overlap I/O processing? (c)

a 2

b 3

c 4

d 5

38) When defining a KSDS, the best place to specify CISZ is generally (b)

a At the cluster level

b At the data level only

c At the index level only

d At both data and index levels

39) For direct processing the recommended number of data buffers is (b)

a STRNO

b STRNO+1

c STRNO+2

d STRNO+3

e None

40) For 3380 DASD, TRK(50 5) results in which CA size for a KSDS defined with NOIMBED? (b)

a 1 TRK

b 5 TRKS

c 15 TRKS

d 50 TRKS

e None

41) Suppose you are defining a multi-volume data set with VOL(A B) and five key ranges specified. Which of the following correctly indicates where each key range will be located? (c)

a First key range on VOL A; second on B; third on A; etc.

b First key range on VOL B; second on A; third on B; etc.

c First key range on VOL A; remaining key ranges on B.

d All key ranges on VOL A; B is used for overflow only.

e All key ranges on VOL B; A is used for overflow only.

42) An alternate index can be defined for which cluster type? (b)

a KSDS and RRDS

b KSDS and ESDS

c KSDS and LDS

d KSDS only

e KSDS, ESDS and RRDS

43) If an application program accesses a base cluster in alternate key sequence, then DD statements are needed for which data sets? (f)

a Base cluster

b Alternate index

c Path

d a and b

e a and c

f a, b and c

44) An alternate index itself is which cluster type? (d)

a LDS

b RRDS

c ESDS

d KSDS

e None

45) Which of the following backs up data in CI mode? (b)

a REPRO only

b EXPORT only

c Both REPRO and EXPORT

d Neither REPRO nor EXPORT

46) Which of the following writes catalog information into the backup data set? (b)

a REPRO only

b EXPORT only

c Both REPRO and EXPORT

d Neither REPRO nor EXPORT

47) Which of the following requires a DELETE/DEFINE before the command can be used to restore an

existing data set? (a)

a REPRO only

b IMPORT only

c Both REPRO and IMPORT

d Neither REPRO nor IMPORT

48) With HBACKDS the use of apostrophes to enclose the dsname is (b)

a Required

b Used to exclude the TSO id as the high level qualifier

c Required only if one or more segments are specified generically

d Not allowed if the data set is password protected

SECTION 2

State whether True or False:

1. All VSAM data sets reside on DASD devices. (T)

2. Whenever a record is retrieved from DASD, the entire CA containing it is read into VSAM buffer. (F)

3. A LDS has no control information embedded in its CIs. (T)

4. In an RRDS, the position of a data record can be changed. (F)

5. Records from an ESDS can either be accessed sequentially or by RBA. (T)

6. Deletions and updating of records is possible in ESDS. (F)

7. Spanned records can only be used in ESDS or KSDS. (T)

8. Spanned records are records larger than CA size. (F)

9. A CI that contains the record segment of a spanned record contains no other data. (T)

10. Spanned records must be accessed in LOCATE mode. (F)

11. A KSDS has both data and index components. (T)

12. A newly inserted record is always added at the end of a KSDS. (F)

13. A new index entry is inserted in the sequence set record corresponding to a CI split. (T)

14. IMBED places the sequence set CI for a data control area within the control area. (T)

15. VSAM control intervals containing data records have at least one RDF and one CIDF.(T)

16. Control area sizes vary by device type. (F)

17. Control interval sizes vary by device type. (T)

18. For a KSDS, the larger the data CA size, the smaller the number of index CIs. (F)

19. We cannot access variable-length blocked records in VSAM. (F)

20. MCAT contains pointers to system data sets and user catalogs. (T)

21. While creating VSAM data sets, provision of component names is a must. (F)

22. JOBCAT identifies a default catalog for a single job step. (F)

23. There is a one-to-one correspondence between BCSs and VVDSs. (F)

24. The need for JOBCAT/STEPCAT statements has been replaced by the ALIAS. (T)

25. Aliases are limited to the first segment of the component name. (F)

26. The cluster name is required when defining VSAM cluster using DEFINE CLUSTER command. (T)

27. Any parameters in coded for the cluster in DEFINE CLUSTER will also apply to the data and index components. (T)

28. If the space allocation is coded at cluster level in DEFINE CLUSTER, the space is divided between data and index. (T)

29. If the specified CISZ is not valid in DEFINE CLUSTER, VSAM increases the number to the next valid CISZ. (T)

30. All the parameters for LISTCAT command are required. (F)

31. A data component name will be generated by AMS if it is not explicitly coded. (T)

32. DEFINE CLUSTER for a KSDS will generate cluster, data and index information even if only cluster information is specified. (T)

33. The candidate volume is not used when data set is initially loaded. (T)

34. Suppose TEST.DATASET is a KSDS. The following statement will print cluster information only:

35. LISTCAT ENTRIES (TEST.DATASET) ALL (F)

36. REPRO copies or merges an alternate index as an ESDS. (F)

37. A PRINT command prints only VSAM data sets. (F)

38. A KSDS can be printed only in key order. (F)

39. A RRDS is printed in relative record number sequence. (T)

40. The default print format is CHARACTER. (F)

41. Generic keys can be specified in PRINT FROMKEY and TOKEY. (T)

42. REPRO will stop processing records when a total of four physical I/O errors occur while writing to the

output data set. (F)

43. REPRO REUSE against a non-empty target data set defined with NOREUSE will reset the target data set. (F)

44. In altering a KSDS, BUFND and BUFNI can be specified instead of BUFFERSPACE.(F)

45. ALTER REMOVEVOLUMES will not remove the volume if the data set currently has data on the volume. (T)

46. ALTER can be used to change ESDS to LDS. (T)

47. ALTER NULLIFY can be used to nullify all passwords, except the master. (F)

48. ALTER modifies the cataloged attributes of a VSAM data set. (T)

49. Generic names can be used to rename a group of objects or to alter an attribute of a group of objects. (T)

50. Data Class specifications override the appropriate JCL parameters. (F)

51. Not all attributes can be specified through JCL. (T)

52. VSAM data can be read by logical record or by control interval access. (T)

53. OPEN causes VSAM to verify that the processing options match the cluster type. (T)

54. COBOL does not support skip-sequential processing. (T)

55. COBOL supports RBA addressing and backward processing. (F)

56. VS COBOL II supports skip-processing. (F)

57. Non-spanned records may be accessed in either MOVE or LOCATE mode. (T)

58. The ISAM interface program allows VSAM programs to access ISAM data sets. (F)

59. Cross system sharing is either between multiple systems or multiple virtual machines.(T)

60. Software end-of-file is a CI containing all zeroes excluding CIDF. (F)

61. VERIFY can be used for empty data sets. (F)

62. Catalog password protection is required for data set password checking. (T)

63. To ensure read integrity the application program must code ENQ/DEQ. (T)

64. For a data set with SHAREOPTIONS(4 3), CA splits are not allowed. (F)

65. The default for DELETE CLUSTER is NOERASE. (T)

66. If a cluster has VSAM password protection, the cluster MUST have a master password. (T)

67. The high-level index set record is maintained in the buffer if more than one index buffer (per string ) is provided. (T)

68. VSAM allocates index buffers for all cluster types, even if the buffers are never used.(T)

69. BUFND and BUFNI are preferable to BUFFERSPACE. (T)

70. STRNO is used for sharing data sets across regions. (T)

71. Data buffers and control blocks are allocated below 16M by default. (T)

72. Large control intervals decrease virtual storage requirement for buffers. (F)

73. Buffer space specified at ACB overrides the defined value, if the ACB value is more. (F)

74. The default for DEFINE CLUSTER is ERASE. (F)

75. A large percentage of unused CI free space causes additional I/Os when accessing the data set sequentially. (T) Sequential processing does not use CI free space beyond the free space threshold. (T)

76. The larger the free space, the more are the levels of index. (T)

77. Improved CI (ICI) access is available for logical record processing as well as CNV processing. (F)

78. Processing a large data set with multiple extents in DIR mode performs approximately as well as processing a large single extent data set in DIR mode. (F)

79. IMBED replicates the sequence set CI associated with a data CA on the first track of data CA.

80. REPLICATE imbeds the index set within the data component. (F)

81. In a multiple volume data set the first allocation of space on a volume is always a primary allocation. (T)

82. Index key compression can be suppressed with the NOCOMPRESS parameter. (F)

83. For sequential processing larger data CIs are desirable. (T)

84. Key compression applies to the keys of both index and data components. (F)

85. Multiple alternate indexes may be defined over a base cluster. (T)

86. Alternate indexes are spanned record data sets. (T)

87. The size of an alternate index is about the same size of its base cluster. (F)

88. AIX records may be longer than specified in the DEFINE AIX maximum record size.(T)

89. A path is required so that an application program can specify base cluster keys and retrieve alternate index records. (T)

90. Base cluster must be empty for BLDINDEX. (F)

91. Upgrade is done only for non-empty alternate indexes. (T)

92. After reorganizing a KSDS, the physical sequence of data is same as the logical sequence of data. (T)

93. Index component is however not reconstructed, after the reorganization of a KSDS. (F)

94. EXPORT extracts catalog information and creates a copy of the data records. (T)

95. Records larger than 32760 cause EXPORT in CIMODE to terminate with an error. (F)

96. CIMODE is the default for EXPORT of an LDS. (T)

97. The base cluster must be imported before the alternate indexes. (T)

98. The base cluster must be exported before the alternate indexes (F)

99. DFDSS can be used to reorganize a KSDS. (T)

100.If the HIGH-USED-RBA of the IMPORT OUTDATASET parameter is zero, then VSAM deletes and redefines the OUTDATASET before the IMPORT operation. (F)

101.ISMF can be used to create a DFHSM batch job stream. (T)

102.Data Set List line operator commands may effect more than one data set. (T)