Tools for Managing Libraries

The SAS utilities that are available for SAS file management enable you to work with more than one SAS file at a time, as long as the files belong to the same library. The advantage of learning and using SAS Explorer, functions, options, and procedures is that they automatically copy, rename, or delete any index files or integrity constraints, audit trails, backups, and generation data sets that are associated with your SAS data files. Another advantage is that SAS utility procedures work on any operating environment at any level.

There are several SAS window options, functions, and procedures available for performing file management tasks. You can use the following features alone or in combination, depending on what works best for you. See Choosing the Right Procedure in Base SAS Procedures Guide for detailed information on SAS utility procedures. The SAS windowing environment and how to use it for managing SAS files is discussed in Introduction to the SAS Windowing Environment and Managing Your Data in the SAS Windowing Environment as well as in the online Help.

CATALOG procedure

provides catalog management utilities with the COPY, CONTENTS, and APPEND procedures.

DATASETS procedure

provides all library management functions for all member types except catalogs. If your site does not use the SAS Explorer, or if SAS executes in batch or interactive line mode, using this procedure can save you time and resources.

SAS Explorer

includes windows that enable you to perform most file management tasks without submitting SAS program statements. Type LIBNAME, CATALOG, or DIR in the Toolbar window to use SAS Explorer, or select the Explorer icon from the Toolbar menu.

DETAILS system option

Sets the default display for file information when using the CONTENTS, or DATASETS procedure. When enabled, DETAILS provides additional information about files, depending on which procedure or window you use.

SAS Explorer and SAS procedures enable you to obtain a list, or directory, of the members in a SAS library. Each directory contains the name of each member and its member type. For the member type DATA, the directory indicates whether an index, audit trail, backup, or generation data set is associated with the data set. The directory also describes some attributes of the library, but the amount and nature of this information vary with the operating environment.

Note:   SAS libraries can also contain various SAS utility files. These files are not listed in the library directory and are for internal processing.  

SAS provides another method of accessing files in addition to assigning a libref with the LIBNAME statement or using the New Library window. To use this method, enclose the filename, or the filename and path, in single quotation marks.

For example, in a directory based system, if you want to create a data set named MYDATA in your default directory, that is, in the directory that you are running SAS in, you can write the following line of code:

data 'mydata';

SAS creates the data set and remembers its location for the duration of the SAS session.

If you omit the single quotation marks, SAS creates the data set MYDATA in the temporary WORK subdirectory, named WORK.MYDATA:

data mydata;

If you want to create a data set named MYDATA in a library other than the directory in which you are running SAS, enclose the entire path in quotation marks, following the naming conventions of your operating environment. For example, the following DATA step creates a data set named FOO in the directory C:\sasrun\mydata.

data 'c:\sasrun\mydata\foo';

This method of accessing files works on all operating environments and in most contexts where a libref.data-set-name is accepted as a SAS data set. Most data set options can be specified with a quoted name.

You cannot use quoted names for

• SAS catalogs

• MDDB and FDB references

• contexts that do not accept a libref, such as the SELECT statement of PROC COPY and most PROC DATASETS statements

• PROC SQL

• DATA step stored programs, or SAS views

• SAS Component Language (SCL) open function

data 'c:\root\mystuff\sasstuff\work\myfile';

data '/u/root/mystuff/sastuff/work/myfile';

data 'user489.mystuff.saslib(member1)'; 
      /* bound SAS library */

data '/mystuff/sasstuff/work/myfile'; 
      /* UNIX file system library */

data 'filename filetype filemode';

You can use operating environment commands to copy, rename, and delete the operating environment file or files that make up a SAS library. However, to maintain the integrity of your files, you must know how the SAS library model is implemented in your operating environment. For example, in some operating environments, SAS data sets and their associated indexes can be copied, deleted, or renamed as separate files. If you rename the file containing the SAS data set, but not its index, the data set will be marked as damaged.

CAUTION:

Using operating environment commands can damage files.

You can avoid problems by always using SAS utilities to manage SAS files.  

Copyright © 2010 by SAS Institute Inc., Cary, NC, USA. All rights reserved.