SAS Companion for the OS/390 Environment

Introduction

The V8 and V8TAPE engines access V8 and V8TAPE SAS data libraries, respectively. Overview of the V8 and V8TAPE Engines summarizes useful information about these engines. The V8 engine supports direct access to individual members of a library, without having to search through the entire library sequentially. The V8TAPE engine supports sequential format data libraries on tape or on disk.

In SAS Version 8, a SAS library can exist as one of the following:

Direct Access Bound Library: A SAS data library in a direct access engine format (V8 or V6 engine) that is implemented with a single specially formatted OS/390 disk data set.
Sequential Access Bound Library: A SAS data library which exists in a sequential engine format (V8TAPE or V6TAPE), implemented within a single OS/390 disk or tape data set.
HFS Library: Is a collection of SAS files with the same engine format (V8 or V8TAPE) that are stored in a directory of the hierarchical file system of UNIX System Services.
Hiperspace Library: Is a collection of SAS files with the same engine format that are loaded into an OS/390 hiperspace, which is virtual storage backed by available expanded storage.

For general information about SAS library engines, see SAS Library Engines and SAS Language Reference: Dictionary.

Overview of the V8 and V8TAPE Engines

V8 Engine V8TAPE Engine

Member Types Supported ACCESS ACCESS*

CATALOG CATALOG*

DATA** DATA

ISTORE ISTORE

PROGRAM PROGRAM*

VIEW VIEW*

OS/390-Specific Options for Bound Libraries (specified in LIBNAME statement) BLKSIZE= BLKSIZE=

DATACLAS= DATACLAS=

DISP= DISP=

DLTRUNCHK n/a

EXTEND EXTEND

HIPERSPACE n/a

LABEL= LABEL=

LIKE= LIKE=

LINEAR LINEAR

MGMTCLASS= MGMTCLASS=

PROMPT PROMPT

SPACE= SPACE=

STORCLAS= STORCLAS=

UNIT= UNIT=

VOLSER= VOLSER=

WAIT= WAIT=

OS-390-Specific Options for HFS Libraries (specified In LIBNAME statement) HFS HFS

PROMPT PROMPT

Portable Data Set Options All All except for COMPRESS=, INDEX=, and REUSE=

OS/390 Specific Data Set Options n/a FILEDISP=

OS/390-Specific System Options BLKSIZE= FILEDEV=

BLKSIZE()= FILESPPRI=

FILEDEV FILESPEC=

FILESPPRI= FILEUNIT=

FILESPEC= FILEVOL=

FILEUNIT= SYSPREF=

FILEVOL= TAPECLOSE=

SYSPREF=

DCB Attributes for Bound Libraries DSORG=PS DSORG=PS

RECFM=FS RECFM=U

BLKSIZE=<value>, where <value> is in the range 4096-32,256 in increments of 512. The default is 6144. BLKSIZE=<value>, where <value> is up to the maximum for your device type.

LRECL=<value>, same as BLKSIZE= LRECL=any value

* Limited support: you can use the V8TAPE engine to move or transport these member types, but you cannot use the V8TAPE engine to access the information within these members.
**Including indexing and audit trail capabilities.

***Overview of the V8 and V8TAPE Engines***
	V8 Engine	V8TAPE Engine
Member Types Supported	ACCESS	ACCESS*
CATALOG	CATALOG*
	DATA**	DATA
	ISTORE	ISTORE
	PROGRAM	PROGRAM*
	VIEW	VIEW*
OS/390-Specific Options for Bound Libraries (specified in LIBNAME statement)	BLKSIZE=	BLKSIZE=
DATACLAS=	DATACLAS=
DISP=	DISP=
DLTRUNCHK	n/a
EXTEND	EXTEND
HIPERSPACE	n/a
LABEL=	LABEL=
LIKE=	LIKE=
LINEAR	LINEAR
MGMTCLASS=	MGMTCLASS=
PROMPT	PROMPT
SPACE=	SPACE=
STORCLAS=	STORCLAS=
UNIT=	UNIT=
VOLSER=	VOLSER=
WAIT=	WAIT=
OS-390-Specific Options for HFS Libraries (specified In LIBNAME statement)	HFS	HFS
PROMPT	PROMPT
Portable Data Set Options	All	All except for COMPRESS=, INDEX=, and REUSE=
OS/390 Specific Data Set Options	n/a	FILEDISP=
OS/390-Specific System Options	BLKSIZE=	FILEDEV=
BLKSIZE()=	FILESPPRI=
FILEDEV	FILESPEC=
FILESPPRI=	FILEUNIT=
FILESPEC=	FILEVOL=
FILEUNIT=	SYSPREF=
FILEVOL=	TAPECLOSE=
SYSPREF=
DCB Attributes for Bound Libraries	DSORG=PS	DSORG=PS
RECFM=FS	RECFM=U
BLKSIZE=<value>, where <value> is in the range 4096-32,256 in increments of 512. The default is 6144.	BLKSIZE=<value>, where <value> is up to the maximum for your device type.
LRECL=<value>, same as BLKSIZE=	LRECL=any value
* Limited support: you can use the V8TAPE engine to move or transport these member types, but you cannot use the V8TAPE engine to access the information within these members. **Including indexing and audit trail capabilities.

Utilities That You Can Use with Direct Access Bound Libraries

You can use standard OS/390 utilities such as IEBGENER, ISPF/PDF 3.3, or DF/HSM to copy or move SAS data libraries that were created with the V8 engine or with the V8TAPE engine. As long as the block size of the data library that you are copying is not changed and not greater than the track capacity of the target device, a V8 or V8TAPE data library may be transferred between unlike device types (for example, 3350 to 3380). This makes it easier to use DASD management software such as IBM's DF/HSM, FDR by Innovation Data Processing, or DMS/OS by Sterling Software.

SAS Data Sets in HFS Libraries

SAS data sets in HFS libraries are stored as individual HFS files within the directory that defines the library. The filename format is lowercase, with a period and filename extension provided by SAS.

CAUTION:: Do not change the filename extensions of SAS files. Filename extensions determine how SAS accesses files; changing them can cause unpredictable results.

The following table describes SAS filename extensions.

File Extensions for SAS Files in HFS Libraries
Random Access Files Sequential Access Files SAS Member Type Description

.sas7bdat .sas7sdat DATA SAS data file

.sas7bndx .sas7sndx INDEX Data file index; not treated by the SAS System as a separate file

.sas7bcat .sas7scat CATALOG SAS catalog

.sas7bpgm .sas7spgm PROGRAM Stored program (DATA step)

.sas7bvew .sas7svew VIEW SAS data view

.sas7bacs .sas7sacs ACCESS Access descriptor file

.sas7baud .sas7saud AUDIT Audit file

.sas7bfdb .sas7sfdb FDB Consolidation database

.sas7bmdb .sas7smdb MDDB Multidimensional database

.sas7bods .sas7sods SASODS Output delivery system file

.sas7bdmd .sas7sdmd DMDB Data mining database

.sas7bitm .sas7ssitm ITEMSTOR Item store file

.sas7butl .sas7sutl UTILITY Utility file

.sas7bput .sas7sput PUTILITY Permanent utility file

.sas7bbak .sas7sbak BACKUP Backup file

***File Extensions for SAS Files in HFS Libraries***
Random Access Files	Sequential Access Files	SAS Member Type	Description
.sas7bdat	.sas7sdat	DATA	SAS data file
.sas7bndx	.sas7sndx	INDEX	Data file index; not treated by the SAS System as a separate file
.sas7bcat	.sas7scat	CATALOG	SAS catalog
.sas7bpgm	.sas7spgm	PROGRAM	Stored program (DATA step)
.sas7bvew	.sas7svew	VIEW	SAS data view
.sas7bacs	.sas7sacs	ACCESS	Access descriptor file
.sas7baud	.sas7saud	AUDIT	Audit file
.sas7bfdb	.sas7sfdb	FDB	Consolidation database
.sas7bmdb	.sas7smdb	MDDB	Multidimensional database
.sas7bods	.sas7sods	SASODS	Output delivery system file
.sas7bdmd	.sas7sdmd	DMDB	Data mining database
.sas7bitm	.sas7ssitm	ITEMSTOR	Item store file
.sas7butl	.sas7sutl	UTILITY	Utility file
.sas7bput	.sas7sput	PUTILITY	Permanent utility file
.sas7bbak	.sas7sbak	BACKUP	Backup file

File Sharing in HFS Libraries

When SAS creates or updates a member of an HFS library, it places an exclusive lock on the entire file. The lock prevents other jobs, processes, or SAS sessions from reading, writing, or updating that file until the lock is removed. The write lock is analagous to a DISP=OLD data set enqueue.

When SAS reads an existing member of an HFS library, it places a read (or shared) lock on the entire file, which prevents other jobs, processes, or SAS sessions from updating the file, though it is still possible for others to read the file. The read lock is analagous to DISP=SHR data set enqueing.

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