DYNAM Command

Syntax: How to Manipulate Data Sets Under z/OS

DYNAM subcommand operand [operand]...

where:

subcommand

Required. Is one of the following operations:

ALLOCATE ALLOC ALLO	Allocates a data set. A wide variety of allocation options is supported.
CONCAT CONC	Concatenates data sets.
FREE	Frees data sets specified by ddnames or dsnames. Each name may contain wildcard characters.
CLOSE CLO	Closes data sets. Useful when the data sets cannot be freed because they are open. The command has the same syntax as DYNAM FREE above.
COPY	Copies an entire data set or selected PDS members. The command has powerful features such as record format conversion, either automatic or controlled by options.
COPYDD	Copies data between z/OS data sets and/or HiperFOCUS files. DYNAM COPY has been enhanced to handle all functions offered by COPYDD, and is recommended for use instead of COPYDD.
DELETE DEL	Deletes an entire data set or selected PDS members.
RENAME REN	Renames an entire data set or selected PDS members.
SUBMIT SUB	Submits z/OS jobs.
COMPRESS COMP	Compresses partitioned data sets (PDSs).
SET TEMP	Allocates temporary files.

operand: May be a keyword, a keyword followed by its parameter, or a parameter without a keyword.

The following rules apply to the DYNAM command:

The subcommand name, keywords, and parameters are separated with one or more blanks. Keywords are coded in free format.
A parameter may be a list of subparameters (for example, VOLUME for a multi-volume data set). Subparameters in the list should be separated with commas. For blanks between subparameters (with or without the comma), enclose the entire list in parentheses. For example:
```
A,B (A,B) (A B) (A, B) (A,B C, D)
```
DYNAM commands may span several lines. To do so, enter a hyphen (-) at the end of each line to be continued. In concatenating the lines, blanks after the hyphen and leading blanks from the next line are removed. Blanks before the hyphen are removed if they are preceded with a comma. The total length of a DYNAM command may not exceed 2048 characters.
Most keywords may be truncated up to the shortest unambiguous length. The commonly used abbreviations are fixed. It is important to note that the unique truncation of a keyword may not always be valid as new keywords are added. Using the full keyword in files and using truncations interactively is recommended.
Fixed abbreviations are listed in the following syntax descriptions. For example, DDNAME may be abbreviated as DD, DDN, DDNA, DDNAM, or DDNAME.
Certain keywords have synonyms. For example, the keywords FILENAME and DDNAME are synonyms, and so are DATASET and DSNAME.
As in TSO, a data set name can be enclosed in single quotation marks. Prefix substitution is not supported; only the fully qualified data set names should be specified.
Some DYNAM commands accept either the ddname or data set name (dsname) as the same parameter. In such cases, the parameter is considered a ddname if it is not longer than 8 bytes, does not contain periods (.), and is not enclosed in single quotation marks. Otherwise, the parameter is considered a data set name. Thus, to specify an unqualified data set name, enclose it in single quotation marks.
Dialogue Manager variables can be used in a DYNAM command, in which case the variable value is substituted at run time. If a variable is used as part of a data set name, it may need to be followed by extra period characters (.) in order to be substituted correctly. For example, in the following DYNAM command, three periods are required. The first period ends the variable name. If there were only a second period, it would be considered an indexed variable, and no period would be inserted in the string. The third period indicates that one period should be inserted into the string after the variable name:
```
-SET &OUT_NAME = CAR ;
DYNAM ALLOC F CAR DA USER1.&OUT_NAME...FOCUS SHR REU
```
The resulting string is:
```
DYNAM ALLOC F CAR DA USER1.CAR.FOCUS SHR REU
```

The DYNAM command and its subcommands, except for COMPRESS and CLOSE, are available from the DYNAM Utilities Menu. Additional allocations for the menu are not required. Private applications may be included on the primary menu. To access the menu, enter the command:

EX DYMENU

Use of Data Sets

z/OS obtains a lock for any allocated data set name: a shared lock for those specified as SHR; an exclusive lock for OLD, NEW, or MOD.

Although data sets can be allocated more than once in a job step, only one type of lock may be obtained. For example, if the data set is allocated as SHR and is then allocated as OLD in the same step, the z/OS lock changes from shared to exclusive, and the data set will not be available for use by other jobs until all allocations in this job are freed.

In addition, a z/OS exclusive lock is not sufficient in multi-user environments, such as FOCUS MSO. If one user were to allocate a data set as OLD, z/OS would allow another user to allocate it as OLD also, because both requests occur in the same job step. This can cause data set corruption due to simultaneous updating.

In order to alleviate these issues, the DYNAM commands that manipulate data sets use an improved locking mechanism, similar to that implemented in ISPF:

Any output PDS is allocated by DYNAM (or preallocated by the user) as SHR. This avoids exclusive z/OS locking, which lasts until all data set allocations are free.
To protect from simultaneous updating, DYNAM obtains an exclusive lock as used by ISPF (and other programs, including LINKEDIT), but only during the actual update time. This lock controls access to the data set between users, even from within the same job step.
Note: The DYNAM locking mechanism protects from simultaneous updating and possible corruption of data, but does not protect from updating and simultaneous reading. For example, it is possible to continue to read a PDS member recently deleted by another user.

ALLOCATE Subcommand

How to:

Allocate a Data Set With the ALLOCATE Subcommand

The DYNAM ALLOCATE command allocates a data set.

Syntax: How to Allocate a Data Set With the ALLOCATE Subcommand

DYNAM ALLOCATE normal_disp [CLOSE]

DDNAME ddname [DEFER] [LONGNAME lnam] [DSNAME dsname{(memname)|(n)} 
[DUMMY]
[EXPDT date]
[HIPER OFF]

[INPT|OUTPT]

[LABEL type]
[MEMBER memname] status [MSVGP msvgp]

[PARALLEL] [PASSWORD password] [PERM] [POSITION nnnn]
[REFVOL dsname] [RETPD days] [REUSE]
[UNIT unit [UCOUNT n]]
[VOLUME volser]

Space operands are:

space_format

space_alloc

 [DIR n]
 [PRIMARY n1]
 [RELEASE] [ROUND]
 [SECONDARY n2] [SPACE space]

DCB operands are:

 [BLKSIZE n] [BUFNO n]
 [DEN n] [DSORG dsorg]
 [LRECL n]
 [RECFM recfm] [REFDD ddname] [REFDSN dsname]

SMS and VSAM operands are:

 [DATACLASS name] [DSNTYPE {LIBRARY|PDS}]

 [KEYOFF n]
 [LIKE dsname]
 [MGMTCLASS name]
 [RECORG recorg]
 [SECMODEL name] [STORCLASS name]
 [BUFND m]
 [BUFNI n]

Output printing operands are:

 [DEST dest[.user]]

 [FCB name [ALIGN|VERIFY]] [FORMS name]

 [HOLD]
 [OUTLIM n] [OUTPUT name]
 [SYSOUT class]
 [USER user]
 [WRITER name]

where:

ALLOCATE

Can be abbreviated as ALLOC or ALLO.

normal_disp

Can be one of the following:

CATALOG 
DELETE 
KEEP 
UNCATALOG 
UNCAT

Data set normal disposition. By default, for a data set status of NEW, if dsname is specified, the disposition is CATALOG. Otherwise, the disposition is DELETE. Incompatible with SYSOUT. Synonyms are: CATALOG-CATLG.

CLOSE: Deallocation of the data set at close rather than at the end of the step. JCL analogy: FREE=CLOSE.
DDNAME ddname DDDEFER: DDNAME to be associated with an allocation. Must be specified. Synonyms are: DDname-Filename. Assign device(s) to the data set but defer mounting of the volume(s) until the data set is opened. JCL analogy: DEFER in UNIT.
DSNAME dsname [(memname)]: Member name can be specified either in parentheses after dsname or using keyword MEMBER (see below). If dsname is specified as asterisk (*), terminal is allocated. This is used for output only. Synonyms are: DSname-DAtaset.
[(n)]: Relative GDG number.
DUMMY: Dummy data set is to be allocated.
EXPDT date: Expiration date in format YYDDD, YYYY/DDD, or YYYYDDD. Incompatible with RETPD and SYSOUT.
HIPER OFF: Prohibit allocation in a hiperspace. Equivalent to the "UNIT NOHIPER" and is used when UNIT is to be specified too. For example, "UNIT VIO HIPER OFF".
INPT OUTPT: Data set is to be processed as input only (INPT) or output only (OUTPUT). JCL analogy: IN in LABEL. Incompatible with SYSOUT.
LABEL type: Type of volume labels. Can be one of the following: NL, SL, NSL, SUL, BLP, LTM, AL, or AUL. Incompatible with SYSOUT.
LONGNAME lnam: Is a Master File name longer than eight characters. Creates a copy of the corresponding short Master File in the PDS allocated to DD HOLDMAST. For more information, see the Describing Data manual.
MEMBER memname: Name of a PDS member to be allocated. See also DSNAME.
status: Data set status. Default: NEW. Incompatible with SYSOUT. Can be one of the following: MOD, NEW, OLD, SHR
MSVGP msvgp: Identification of a group of mass storage system (MSS) virtual volumes. Incompatible with SYSOUT and VOLUME.
PARALLEL: Each volume is to be mounted on a separate device. JCL analogy: P in UNIT.
PASSWORD password: Password for a password protected data set.
PERM: The allocation is to be permanent—that is, protected from being freed or concatenated by any DYNAM command issued by an MSO user. The operand is valid only in an MSO server initialization profile.
POSITION nnnn: Data set sequence number on a tape volume, up to 9999. JCL analogy: the first subparameter in LABEL.
REFVOL dsname: Volume serial information is to be obtained from the specified cataloged data set. JCL analogy: VOL=REF=dsname. Incompatible with SYSOUT and VOLUME.
RETPD days: Retention period, up to 9999 days. Incompatible with EXPDT and SYSOUT.
REU[SE]: If the ddname to be allocated is already in use, it is to be freed.
UNIT unit: Device group name, device type, specific unit address, or NOHIPER. NOHIPER prohibits allocation in a hiperspace, meaningful for a temporary (NEW,DELETE) data set; see also HIPER OFF.
UCOUNT n: Number of volumes to allocate.
VOLUME volser VOL: Volume serial numbers. Incompatible with REFVOL and SYSOUT. Synonyms are: VOLume-VOLser.

Space operands may be:

space_format

Can be one of the following:

ALX 
CONTIG 
MXIG

Format of the primary space to be allocated: up to five contiguous areas (ALX); one contiguous area (CONTIG); one maximal contiguous area (MXIG). JCL analogy: ALX/CONTIG/MXIG in SPACE.

space_alloc

Can be one of the following:

BLOCKS [n]
CYLINDERS 
MEGABYTES 
PAGES 
TRACKS

N represents units of primary and secondary space allocation. If parameter for BLOCKS is omitted, the average block length is copied from BLKSIZE. If space unit is omitted but SPACE and BLKSIZE are specified, BLOCKS equal BLKSIZE is used. For PAGES, BLOCKS 4096 is used. BLKSIZE must be specified if the BLOCKS parameter is specified. Synonyms are: CYLINDERS-CYLs, TRACKS-TRKs.

DIR n

Number of 256-byte records for the directory of a PDS.

PRIMARY n1

Primary space quantity. See also SPACE.

RELEASE

Unused space is to be released when the data set is closed. Synonyms are: RELEASE-RLSE.

ROUND

If space is requested in BLOCKS, MEGABYTES, or PAGES, it is to be rounded to whole cylinder(s).

SECONDARY n2

Secondary space quantity. See also SPACE.

SPACE space

SP

Primary (n1) and/or secondary (n2) space quantity in one of the following formats:

n1/(n1)/n1,n2/(n1,n2)/n1 n2/(n1 n2)/,n2/(,n2)

Example: Using the DYNAM ALLOCATE Command

Allocate an existing data set:

DYNAM ALLOC DD MYDD DS MYID.DATA.SET SHR REU

Allocate a new data set. Defaults: NEW, CATALOG (DSname present), DSORG PO (not-zero DIR present):

DYNAM ALLOC DD MYDD DS MYID.DATA.SET SPACE 6,2 TRACKS DIR 4 UNIT SYSDA -
RECFM FB LRECL 80 BLKSIZE 1600

Allocate a terminal:

DYNAM ALLOC DD MYDD DS *

Allocate a SYSOUT data set with default output class. Upon freeing, the data set is sent to the user ID U1234 at node SYSVM:

DYNAM ALLOC DD MYDD SYSOUT * DEST SYSVM.U1234

CONCAT Subcommand

How to:

Concatenate Data Sets

The DYNAM CONCAT command concatenates up to 16 data sets.

Syntax: How to Concatenate Data Sets

DYNAM CONCAT [PERM] DDNAME ddname1 ddname2 [ddname3...]

where:

CONCAT: Can be abbreviated as CONC.
PERM: Optional. Marks the concatenation as permanent—that is, protected from being freed or concatenated again by any DYNAM command issued by an MSO user. Valid only in an MSO server initialization profile.
DNAME
DDN
DD: Required. Synonym is FILENAME.
ddname1: Is the first ddname to be concatenated and associated with the resulting concatenated group.
ddname2: Is the second and any subsequent ddname to be concatenated.

Example: Using the DYNAM CONCAT Command

DYNAM CONCAT DDN FOCEXEC MYEX NEWEX

FREE Subcommand

How to:

Deallocate Data Sets

The DYNAM FREE command deallocates any number of specified data sets.

Syntax: How to Deallocate Data Sets

DYNAM FREE {DDNAME ddname [ddname...]|DSNAME dsname [dsname...]}
DYNAM FREE LONGNAME lnam

where:

DDNAME
DDN
DD: Is required if there is no dsname. Synonym is FILENAME.
ddname: Is the ddname of the data set to be freed.
DSNAME
DSN
DS: Is required if there is no ddname. Synonym is DATASET.
dsname: Is the name of the data set to be freed. All ddnames associated with this dsname, except concatenated groups, are deallocated.
lnam: Is a Master File name longer than eight characters. For more information, see the Describing Data manual.

While at least one ddname or data set name is required, you may specify more than one ddname or data set name. Each specified name may contain asterisks (*) and question marks (?) as wildcards. Wildcards are special characters used to specify a subset of names rather than one name. The wildcards can appear anywhere in a name and mean the following:

*: Represents any number of characters. For example, "*Q*" matches any name containing the character "Q".
?: Represents any single character. For example, "?Q?" matches any 3-character name containing the character "Q" in the middle.

If the ddname is not found, an error message is issued only if a single ddname without wildcards is specified. An error message is not displayed if a data set or more than one ddname is not found.

Example: Using the DYNAM FREE Command

DYNAM FREE DDN SYS0* TEMP?
DYNAM FREE DSN MYID.DATA.SET

CLOSE Subcommand

How to:

Close Data Sets

The DYNAM CLOSE command closes data sets, which cannot be freed because they are open.

Syntax: How to Close Data Sets

DYNAM CLOSE {DDNAME ddname [ddname...]|DSNAME dsname [dsname...]}

where:

CLOSE: Can be abbreviated as CLO.
DDNAME
DDN
DD: Is required if there is no dsname. Synonym is FILENAME.
ddname: Is the ddname of the data set to be closed.
DSNAME
DSN
DS: Is required if there is no ddname. Synonym is DATASET.
dsname: Is the name of the data set to be closed. All ddnames associated with this dsname, except concatenated groups, are closed.

While at least one ddname or data set name is required, more than one ddname or data set name may be specified. Each specified name may contain wildcard characters. The same rules apply to the DYNAM CLOSE command as for the DYNAM FREE command (see FREE Subcommand).

COPY Subcommand

How to:

Copy Entire z/OS Data Sets or Selected PDS Members

The DYNAM COPY command copies an entire z/OS data set or selected PDS members.

Syntax: How to Copy Entire z/OS Data Sets or Selected PDS Members

DYNAM COPY dname1 {[TO] dname2 [[MEMBER] members]|[MEMBER] members}
 [options]

where:

dname1

Is the dsname or ddname of the input data set. This is a positional parameter. It must precede all other operands.

TO

May be omitted if dname2 does not match a reserved word, the MEMBER keyword, an option, or the TO keyword. To avoid confusion, use the TO keyword whenever dname2 is a ddname.

dname2

Is the dsname or ddname of the output data set. If the output data set is not a PDS and the dsname is specified, it will be allocated as OLD. If the ddname is specified, and the status is SHR, you must make sure that other users do not access the data set during COPY. Unlike ISPF, DYNAM will lock a non-PDS data set in order to prevent simultaneous updating by different DYNAM users.

MEMBER

May be omitted if members are specified in parentheses.

members

Can be a single member specification or a list of member specifications. If the members are enclosed in parenthesis, blanks preceding the left parenthesis may be omitted.

options

May be one or more of the following options:

APPEND	Adds the input to the end of the existing data, if the output is a sequential data set.
FORCE	Copies input DCB attributes (RECFM, BLKSIZE, LRECL and KEYLEN) to the output data set. By default, only missing values are assigned. Note: Do not use FORCE to change the LRECL of one member of an existing PDS as doing so may potentially destroy the PDS.
KEYMOD	Allows key modification according to input/output KEYLEN: truncation or padding with binary zeros.
REPLACE	Replaces all output members matching the selected member names.
TRUNCATE	Allows truncation of input records that are longer than the output record length. Since trailing blanks are truncated automatically when RECFM is different, the keyword is used either to cut records of the same format or to cut non-blank data.

A member specification has the following syntax

mem[,[newmem][,REPLACE]]

where:

mem

Is the selected member name.

newmem

Is the optional new name for the output member.

REPLACE

Is optional and specifies an existing member to be replaced in the output PDS.

Since the comma may be used in member specifications, they are separated with one or more blanks when specified in a list. Therefore, a list of member specifications is always enclosed in parentheses. For example:

(MEM MEM,NEWMEM MEM,NEWMEM,R MEM,,R)

Note:

All conversions between different DCB attributes (RECFM, BLKSIZE, and LRECL) are performed automatically.
If the entire PDS is copied or any selected member's directory entry contains a TTRN in user data (for example, a load module), the IBM utility IEBCOPY is invoked. In this case, all options except REPLACE are ignored, format conversion is not possible, and copying members to the same PDS is not supported. Note that IEBCOPY requires APF authorization in order to be performed.
If the main member and its alias names are copied, their relationship remains the same on the output PDS. Aliases are not supported for members of HiperFOCUS files.
If a specified ddname has been allocated with a member name, the data set is treated as sequential. However, if input and/or output is a HiperFOCUS file, member name(s) overriding the allocated one can be specified in the command.
If the entire PDS is to be copied (no member list was provided), all members are replaced, regardless of the presence or absence of the REPLACE keyword.

Example: Using the DYNAM COPY Command

Copies the entire data set, whether it is a PDS or not.

DYNAM COPY MYDD MYID.DATA.SET

All four commands are equivalent. Either input or output may be a sequential data set, or both are PDSs.

DYNAM COPY MYDD MYID.DATA.SET MEMBER MEM
DYNAM COPY MYDD MYID.DATA.SET(MEM)
DYNAM COPY MYDD(MEM) MYID.DATA.SET
DYNAM COPY MYDD MEMBER MEM MYID.DATA.SET

Copies and renames one member.

DYNAM COPY MYID.DATA.LIB TO MYDD(MEM1,MEM2)

Copies two members.

DYNAM COPY MYID.DATA.LIB TO MYDD(MEM1 MEM2)

Copies two members into same PDS with renaming.

DYNAM COPY MYDD(OLD1,NEW1,R OLD2,NEW2)
DYNAM COPY MYDD(OLD1,NEW1 OLD2,NEW2) REPL

COPYDD Subcommand

How to:

Copy Sequential Data Sets, PDS Members, or HiperFOCUS Files

The DYNAM COPYDD command copies a sequential data set, a PDS member, or a HiperFOCUS file.

Syntax: How to Copy Sequential Data Sets, PDS Members, or HiperFOCUS Files

DYNAM COPYDD ddname1[(mem1)] ddname2[(mem2)]

where:

ddname1: Is the ddname of the input data set.
mem1: Optional. Is the input member name.
ddname2: Is the ddname of the output data set.
mem2: Optional. Is the output member name.

Note:

If the specified ddname has been allocated with a member name, the data set is treated as sequential. However, if input and/or output is a HiperFOCUS file, a member name overriding the allocated one can be specified in the command.
Identically named members are always replaced on the output PDS.
All conversions between different DCB attributes (RECFM, BLKSIZE, and LRECL) are performed automatically.
Since the DYNAM COPY command has been upgraded to work with HiperFOCUS files and has more features than COPYDD, using COPY instead of COPYDD is recommended.

Example: Using the DYNAM COPYDD Command

MYDD1 is a sequential file or is allocated with a member name. If MYDD2 is allocated with a member name, MEM2 is valid only if at least one of the ddnames is a HiperFOCUS file.

DYNAM COPYDD MYDD1 MYDD2(MEM2)

DELETE Subcommand

How to:

Delete an Entire z/OS Data Set or Selected PDS Members

The DYNAM DELETE command deletes an entire z/OS data set or selected PDS members.

Syntax: How to Delete an Entire z/OS Data Set or Selected PDS Members

The syntax to delete an entire z/OS data set is:

DYNAM DELETE dsname

To delete individual members use:

DYNAM DELETE dname [MEMBER] members

where:

DELETE: Can be abbreviated as DEL.
dsname: Is the data set name to be deleted and uncataloged.
dname: Is the dsname or ddname of a PDS containing one or more members to be deleted. The ISPF-like lock is obtained.
MEMBER: May be omitted if the members are specified in parentheses.
members: Can be a single member name or a list of members. If the members are enclosed in parentheses, blanks before the left parenthesis can be omitted.

Example: Using the DYNAM DELETE Command

DYNAM DELETE MYID.DATA.OLD
DYNAM DEL MYID.DATA.LIB MEMBER OLD1,OLD2
DYNAM DELETE MYDD(OLD1,OLD2)
DYNAM DEL MYDD(OLD1 OLD2 OLD3)

RENAME Subcommand

How to:

Rename an Entire z/OS Data Set or Selected PDS Members

The DYNAM RENAME command renames an entire z/OS data set or selected PDS members.

Syntax: How to Rename an Entire z/OS Data Set or Selected PDS Members

The syntax to rename an entire z/OS data set is:

DYNAM RENAME dsname1 dsname2

To rename individual members, use

DYNAM RENAME dname [MEMBER] members [REPLACE]

where:

RENAME: Can be abbreviated as REN.
dsname1: Is the data set name to be renamed and uncataloged.
dsname2: Is the new name to be assigned to the data set and cataloged.
dname: Is the dsname or ddname of a PDS containing one or more members to be renamed. The ISPF-like lock is obtained.
MEMBER: May be omitted if the members are specified in parentheses.
members: Can be a single member specification or a list of members. If the members are enclosed in parentheses, blanks before the left parenthesis can be omitted.
REPLACE: Optional. Replaces all members matching the specified new names.

A member specification has the following syntax:

oldmem,newmem[,REPLACE]

where:

oldmem: Is the original member name.
newmem: Is the new member name.
REPLACE: Is optional and replaces existing members with the same name as newmem.

Since the comma is used in member specifications, each pair of members is separated with one or more blanks when specified in a list. Therefore, a list of member specifications is always enclosed in parentheses.

Example: Using the DYNAM RENAME Command

DYNAM RENAME MYID.DATA.OLD MYID.DATA.NEW
DYNAM REN MYID.DATA.LIB MEMBER OLD,NEW,R
DYNAM RENAME MYDD(OLD1,NEW1,R OLD2,NEW2)
DYNAM REN MYDD(OLD1,NEW1 OLD2,NEW2) REPL

SUBMIT Subcommand

How to:

Submit a Job to z/OS

The DYNAM SUBMIT command submits jobs to z/OS.

Syntax: How to Submit a Job to z/OS

DYNAM SUBMIT dname [[MEMBER] members]

where:

SUBMIT: Can be abbreviated as SUB.
dname: Is the dsname or ddname of the input data set(s) containing JCL to be submitted. The ddname can specify a concatenation of data sets.
MEMBER: May be omitted if the members are specified in parentheses.
members: May be a single member name or a list of members. When submitting a member list, the resulting job stream is the concatenation of the members. If the members are enclosed in parentheses, blanks before the left parenthesis can be omitted.

Example: Using the DYNAM SUBMIT Command

DYNAM SUBMIT MYDD MEMBER ASM,PROG,LKED
DYNAM SUB MYDD(ASM,PROG,LKED)
DYNAM SUB MYID.DATA.LIB(CREATE LOAD)
DYNAM SUBMIT MYFILE

Note: The DYNAM SUBMIT command provides an interface with the submit user exit IKJEFF10 as described in the IBM TSO Extensions Version 2 Customization manual. For details, see the Information Builders Technical Memo 7859, Enabling a Site-Specified Submit Exit Routine, or view FOCCTL.DATA(SUBMITZ2).

COMPRESS Subcommand

How to:

Compress a Partitioned Data Set

The DYNAM COMPRESS command compresses the partitioned data sets (PDS).

Syntax: How to Compress a Partitioned Data Set

DYNAM COMPRESS dname [dname]...

where:

COMPRESS: Can be abbreviated as COMP.
dname: Is the dsname or ddname of a PDS to be compressed. The ISPF-like lock is obtained.

If the dsname is specified, it is allocated as OLD. If the ddname is specified and status is SHR, you have to make sure that another user does not access the PDS during the compress operation.

Note: DYNAM COMPRESS uses the IBM utility IEBCOPY, and therefore can only be used when running with APF authorization.

Example: Using the DYNAM COMPRESS Command

DYNAM COMPRESS MYDD
DYNAM COMPRESS MYID.DATA.LIB
DYNAM COMP MYDD MYID.DATA.LIB

Comparison of TSO Commands, JCL, and DYNAM

This section shows examples of TSO ALLOCATE and FREE commands, JCL commands, and the equivalent DYNAM commands.

Example: Allocating an Existing File

TSO:

 TSO ALLOC F(FOCEXEC) DA('MYUSER.FOCEXEC.DATA') SHR

JCL:

//FOCEXEC DD DSN=MYUSER.FOCEXEC.DATA,DISP=SHR

DYNAM:

 DYNAM ALLOC FILE FOCEXEC DA MYUSER.FOCEXEC.DATA SHR

Example: Creating a New Data Set

TSO:

TSO ALLOC F(FOCEXEC) DA('MYUSER.FOCEXEC.DATA') -
    SPACE(5,3) TRACKS CATALOG DIR(2) -
    UNIT(SYSDA) USING(NEWDCB) -
    LRECL(80) RECFM(F B) BLKSIZE(1600)

JCL:

//FOCEXEC DD DSN=MYUSER.FOCEXEC.DATA,DISP=(NEW,CATLG),
//   SPACE=(TRK,(5,3,2)),UNIT=SYSDA,
//   DCB=(LRECL=80,RECFM=FB,BLKSIZE=1600)

DYNAM:

DYNAM ALLOC FILE FOCEXEC DA MYUSER.FOCEXEC.DATA -
      SPACE 5,3 TRACKS CATLG DIR 2 UNIT SYSDA - 
      LRECL 80 RECFM FB BLKSIZE 1600

Example: Freeing Files

TSO:

TSO FREE F(FOCEXEC)

DYNAM:

DYNAM FREE FILE FOCEXEC

Example: Concatenating Files

TSO:

TSO ALLOC F(FOCEXEC) DA('MYUSER.FOCEXEC.DATA'-
    'MYUSER.PROGRAMS.DATA') SHR

JCL:

//FOCEXEC DD DSN=MYUSER.FOCEXEC.DATA,DISP=SHR
//   DD DSN=MYUSER.PROGRAMS.DATA,DISP=SHR

DYNAM:

DYNAM ALLOC FILE FOCEXEC DA MYUSER.FOCEXEC.DATA SHR
DYNAM ALLOC FILE PROGRAMS DA MYUSER.PROGRAMS.DATA SHR
DYNAM CONCAT FILE FOCEXEC PROGRAMS

Allocating Temporary Files

How to:

Allocate Temporary Files
Allocate Temporary Files to MVS Data Sets

Temporary files are transient files that disappear after you end a session.

You can control the size and location of temporary metadata files and data files created by HOLD commands. You can specify that the temporary files reside in the hierarchical file system, MVS data sets, or in hiperspace.

Syntax: How to Allocate Temporary Files

DYNAM SET TEMP[ALLOC] {MVS|HIPER}

where:

MVS: Allocates temporary files to MVS data sets. This is the default value.
HIPER: Allocates temporary files to hiperspace.

Note: For z/OS, temporary metadata files can be allocated using a similar procedure to allocating permanent metadata files:

If DYNAM allocation for HOLDMAST or HOLDACC is present, temporary files are stored in the designated PDSs.
If DYNAM SET TEMP[ALLOC] MVS is issued, temporary files are stored in the default temporary PDSs.
If DYNAM SET TEMP[ALLOC] HIPER is issued, temporary files are stored in HIPERSPACE.

Syntax: How to Allocate Temporary Files to MVS Data Sets

To alter the default allocation parameters for temporary files for MVS data sets, issue the following command.

DYNAM SET TEMP[ALLOC] FOR type dynam_parms

where:

type

Is one of the following: HOLDACC, HOLDMAST, HOLD SAVE, REBUILD, FOCUS, FOCSORT, OFFLINE, or FOC$HOLD.

dynam_parms

Are regular DYNAM ALLOC parameters to be used as default for that type. Note that DCB parameters, if provided here, will be ignored, since they must be compatible with the file type being written.

This is similar to the functionality of IBITABLA. The defaults should be overwritten for all cases when a private copy of IBITABLA exists containing different values.

System defaults for HOLDMAST and HOLDACC are:

TRKS 5 5 DSORG PO DIR 36 NEW REU

System defaults for all other types are:

CYLS 5 10 DSORG PS NEW REU

Example: Allocating HOLD Masters

The following command allocates HOLD Master Files to a data set named USER1.HOLDMAST.DATA

DYNAM SET TEMP FOR HOLDMAST DA USER1.HOLDMAST.DATA SHR REU