The EXCHANGE statement in PROC DATASETS might incorrectly process the exchange a second time in SAS 9.3 or higher (English with DBCS). This is most likely to occur when multiple data sets with similar names exist in the library. The SAS log displays two notes reporting the exchange. The data sets appear as if they had never been exchanged. This problem does not occur in SAS 9.3 or higher (English) or SAS^® (Unicode Support).

The sample code on the Full Code tab replicates the problem. The output that is generated by the sample code is shown on the Results tab.

To circumvent the problem, do one of the following:

• Remove the data sets with similar names from the library.
• Move the two data sets whose names you want to exchange into their own library to perform the exchange.

Operating System and Release Information

Product Family	Product	System	SAS Release
			Reported	Fixed*
SAS System	Base SAS	HP-UX IPF	9.3 TS1M0	9.4 TS1M4
		64-bit Enabled Solaris	9.3 TS1M0	9.4 TS1M4
		64-bit Enabled HP-UX	9.3 TS1M0	9.4 TS1M4
		64-bit Enabled AIX	9.3 TS1M0	9.4 TS1M4
		Windows Vista for x64	9.3 TS1M0
		Windows Vista	9.3 TS1M0
		Windows 7 Ultimate x64	9.3 TS1M0	9.4 TS1M4
		Windows 7 Ultimate 32 bit	9.3 TS1M0	9.4 TS1M4
		Windows 7 Professional x64	9.3 TS1M0	9.4 TS1M4
		Windows 7 Professional 32 bit	9.3 TS1M0	9.4 TS1M4
		Windows 7 Home Premium x64	9.3 TS1M0	9.4 TS1M4
		Windows 7 Home Premium 32 bit	9.3 TS1M0	9.4 TS1M4
		Windows 7 Enterprise x64	9.3 TS1M0	9.4 TS1M4
		Windows 7 Enterprise 32 bit	9.3 TS1M0	9.4 TS1M4
		Microsoft Windows XP Professional	9.3 TS1M0
		Microsoft Windows Server 2008 for x64	9.3 TS1M0	9.4 TS1M4
		Microsoft Windows Server 2008 R2	9.3 TS1M0	9.4 TS1M4
		Microsoft Windows Server 2008	9.3 TS1M0	9.4 TS1M4
		Microsoft Windows Server 2003 for x64	9.3 TS1M0
		Microsoft Windows Server 2003 Standard Edition	9.3 TS1M0
		Microsoft Windows Server 2003 Enterprise Edition	9.3 TS1M0
		Microsoft Windows Server 2003 Datacenter Edition	9.3 TS1M0
		Microsoft® Windows® for x64	9.3 TS1M0	9.4 TS1M4
		z/OS 64-bit	9.3 TS1M0	9.4 TS1M4
		z/OS	9.3 TS1M0	9.4 TS1M4
		Linux	9.3 TS1M0	9.4 TS1M4
		Linux for x64	9.3 TS1M0	9.4 TS1M4
		Solaris for x64	9.3 TS1M0	9.4 TS1M4

* For software releases that are not yet generally available, the Fixed Release is the software release in which the problem is planned to be fixed.

When multiple data sets with similar names exist in a library, the EXCHANGE statement in PROC DATASETS incorrectly processes the exchange a second time. This causes the data sets to appear as before. The sample code below replicates the issue.

---

data mytest;
   x=1;
run;

data mytestt;
   y=2;
run;

data mytesttt;
   z=3;
run;

proc datasets nolist;
   exchange mytest=mytestt;
run;
quit;

proc print data=mytest;
   title 'mytest';
run;

proc print data=mytestt;
   title 'mytestt';
run;
   

SAS (English with DBCS) output after the EXCHANGE statement.  Data appears as it did before the exchange.
The note appears twice in the SAS log. 
                 
                                            mytest                  mytestt
 
                                           Obs    x                 Obs    x


                                            1     1                  1     2

NOTE: Exchanging the names WORK.MYTEST and WORK.MYTESTT (memtype=DATA).
NOTE: Exchanging the names WORK.MYTEST and WORK.MYTESTT (memtype=DATA).
NOTE: PROCEDURE DATASETS used (Total process time):
      real time           0.03 seconds
      cpu time            0.01 seconds
                                          
SAS (English) shows that data set names have been exchanged.  Only one note appears in the SAS log.

                                            mytest                  mytestt
 
                                           Obs    y               Obs    x


                                            1     2                1     1

NOTE: Exchanging the names WORK.MYTEST and WORK.MYTESTT (memtype=DATA).
NOTE: PROCEDURE DATASETS used (Total process time):
      real time           0.01 seconds
      cpu time            0.01 seconds

When multiple data sets with similar names exist in a library, the EXCHANGE statement of PROC DATASETS incorrectly processes the exchange a second time. This causes the data sets to appear unchanged.

Type:	Problem Note
Priority:	high

Date Modified:	2016-09-12 15:14:05
Date Created:	2016-09-09 16:01:26