Problem Note 40553: Parallel WHERE clause evaluation returns incorrect results for implicit and explicit pass-through
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Parallel WHERE clause evaluation can return incorrect results for implicit and explicit pass-through when the sorted order for the table is unusable.
When a SAS procedure retrieves rows from a sorted table, it attempts to use information about the sorted order to optimize the way in which the procedure uses the rows. For example, when you use PROC SQL to perform table joins on sorted tables that use extra WHERE predicates to filter table rows, PROC SQL uses information about the sorted order to optimize the JOIN strategy.
SAS® Scalable Performance Data Server® attempts to optimize performance by using parallel WHERE clause evaluation for a sorted table. However, parallel WHERE clause evaluation does not guarantee that rows are returned to PROC SQL in the sorted order, and incorrect results might occur.
Select the Hot Fix tab in this note to access the hot fix for this issue.
Operating System and Release Information
| Product Family | Product | System | Product Release | SAS Release | ||
| Reported | Fixed* | Reported | Fixed* | |||
| SPDS | Scalable Performance Data Server | 64-bit Enabled Solaris | 4.52 | 4.53 | ||
| 64-bit Enabled HP-UX | 4.52 | 4.53 | ||||
| 64-bit Enabled AIX | 4.52 | 4.53 | ||||
| Microsoft Windows XP Professional | 4.52 | 4.53 | ||||
| Microsoft Windows Server 2008 | 4.52 | 4.53 | ||||
| Microsoft Windows Server 2003 for x64 | 4.52 | 4.53 | ||||
| Microsoft Windows Server 2003 Standard Edition | 4.52 | 4.53 | ||||
| Microsoft Windows Server 2003 Enterprise Edition | 4.52 | 4.53 | ||||
| Microsoft Windows 2000 Datacenter Server | 4.52 | 4.53 | ||||
| Microsoft Windows 2000 Advanced Server | 4.52 | 4.53 | ||||
| Microsoft Windows XP 64-bit Edition | 4.52 | 4.53 | ||||
| Microsoft Windows Server 2003 Enterprise 64-bit Edition | 4.52 | 4.53 | ||||
| Microsoft Windows Server 2003 Datacenter Edition | 4.52 | 4.53 | ||||
| Microsoft Windows NT Workstation | 4.52 | 4.53 | ||||
| Microsoft Windows 2000 Professional | 4.52 | 4.53 | ||||
| Microsoft Windows 2000 Server | 4.52 | 4.53 | ||||
| Microsoft Windows Server 2003 Datacenter 64-bit Edition | 4.52 | 4.53 | ||||
| HP-UX IPF | 4.52 | 4.53 | ||||
| Linux for x64 | 4.52 | 4.53 | ||||
| Solaris for x64 | 4.52 | 4.53 | ||||
A fix for this issue for Scalable Performance Data Server 4.52 is available at:
http://ftp.sas.com/techsup/download/hotfix/HF2/B57.html#40553| Type: | Problem Note |
| Priority: | alert |
| Date Modified: | 2012-01-10 15:38:41 |
| Date Created: | 2010-08-10 04:26:25 |