Problem Note 12162: MODIFY Statement uses more I/O in Version 8 than in Version 6
A DATA Step with the MODIFY statement may use more elapsed time and
EXCPs in Version 8 than in Version 6.
In some test cases, SAS wrote the buffer to disk for the master file
after every observation update. SAS should not write to disk until all
the changes that affect the page in the buffer are made. This behavior
accounts for excessive EXCP operations.
This extra I/O causes an increase in elapsed time.
A Technical Support hot fix for Release 8.2 (TS2M0) for this
issue is available at:
http://www.sas.com/techsup/download/hotfix/82_sbcs_prod_list.html#012162
For customers running SAS with Asian Language Support (DBCS), this
hot fix should be downloaded from:
http://www.sas.com/techsup/download/hotfix/82_dbcs_prod_list.html#012162
Operating System and Release Information
| SAS System | Base SAS | Microsoft Windows NT Workstation | 8.2 TS2M0 | 9 TS M0 |
| Microsoft Windows XP Professional | 8.2 TS2M0 | 9 TS M0 |
| Windows Millennium Edition (Me) | 8.2 TS2M0 | |
| Microsoft Windows Server 2003 Enterprise Edition | 8.2 TS2M0 | 9 TS M0 |
| Microsoft Windows 95/98 | 8.2 TS2M0 | |
| Microsoft Windows Server 2003 Standard Edition | 8.2 TS2M0 | 9 TS M0 |
| Microsoft Windows 2000 Server | 8.2 TS2M0 | 9 TS M0 |
| Microsoft Windows Server 2003 Datacenter Edition | 8.2 TS2M0 | 9 TS M0 |
| Microsoft Windows 2000 Datacenter Server | 8.2 TS2M0 | 9 TS M0 |
| Microsoft Windows 2000 Professional | 8.2 TS2M0 | 9 TS M0 |
| Microsoft Windows 2000 Advanced Server | 8.2 TS2M0 | 9 TS M0 |
| OpenVMS VAX | 8.2 TS2M0 | 9 TS M0 |
| Solaris | 8.2 TS2M0 | 9 TS M0 |
| OS/2 | 8.2 TS2M0 | |
| IRIX | 8.2 TS2M0 | 9 TS M0 |
| 64-bit Enabled Solaris | 8.2 TS2M0 | 9 TS M0 |
| z/OS | 8.2 TS2M0 | 9 TS M0 |
| Linux | 8.2 TS2M0 | 9 TS M0 |
| HP-UX | 8.2 TS2M0 | 9 TS M0 |
| ABI+ for Intel Architecture | 8.2 TS2M0 | 9 TS M0 |
| 64-bit Enabled HP-UX | 8.2 TS2M0 | 9 TS M0 |
| 64-bit Enabled AIX | 8.2 TS2M0 | 9 TS M0 |
| CMS | 8.2 TS2M0 | 9 TS M0 |
| OpenVMS Alpha | 8.2 TS2M0 | 9 TS M0 |
| Tru64 UNIX | 8.2 TS2M0 | 9 TS M0 |
| AIX | 8.2 TS2M0 | 9 TS M0 |
*
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.
| Type: | Problem Note |
| Priority: | medium |
| Topic: | Data Management ==> Access ==> SAS I/O
|
| Date Modified: | 2004-08-12 16:31:48 |
| Date Created: | 2004-04-09 14:43:25 |
