Problem Note 43966: Results of query against a very large SAS® Scalable Performance Data Server® table might be incorrect
 |  |  |  |  |
The following example shows code that might return incorrect results in SAS® Scalable Performance Data Server® when executed against a very large table:
proc sql;
create table target as
select sum(a), sum(b), sum(c)
from spdslib.large_table
group by a, b , c
;
quit;
The SAS Scalable Performance Data Server parallel GROUP BY threads
hold a partial GROUP BY in memory, based on the GRPBYROWCACHE server
parameter.
Each thread is given GRPBYROWCACHE/MAXWHTHREADS memory.
When the memory is full, each thread flushes the partial GROUP BY to disk in a per-thread spill file.
The final merge of the parallel GROUP BY reads the per-thread partial results
back in.
Incorrect results might occur on the final merge for a very large table.
Select the Hot Fix tab in this Note to access the hot fix for this problem.
Operating System and Release Information
| Product Family | Product | System | Product Release | SAS Release | ||
| Reported | Fixed* | Reported | Fixed* | |||
| SPDS | Scalable Performance Data Server | Microsoft Windows Server 2003 Datacenter 64-bit Edition | 4.52 | 4.52 HF5 | ||
| Microsoft Windows Server 2003 Enterprise 64-bit Edition | 4.52 | 4.52 HF5 | ||||
| Microsoft Windows Server 2003 Datacenter Edition | 4.52 | 4.52 HF5 | ||||
| Microsoft Windows Server 2003 Enterprise Edition | 4.52 | 4.52 HF5 | ||||
| Microsoft Windows Server 2003 Standard Edition | 4.52 | 4.52 HF5 | ||||
| Microsoft Windows XP Professional | 4.52 | 4.52 HF5 | ||||
| 64-bit Enabled AIX | 4.52 | 4.52 HF5 | ||||
| 64-bit Enabled HP-UX | 4.52 | 4.52 HF5 | ||||
| 64-bit Enabled Solaris | 4.52 | 4.52 HF5 | ||||
| Linux for x64 | 4.52 | 4.52 HF5 | ||||
| Solaris for x64 | 4.52 | 4.52 HF5 | ||||
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#43966A fix for this issue for SAS Scalable Performance Data Server 4.53 is available at:
https://tshf.sas.com/techsup/download/hotfix/HF2/F61.html#43966A fix for this issue for SPD Server 4.4 is available at:
http://www.sas.com/techsup/download/hotfix/spds44.html#043966| Type: | Problem Note |
| Priority: | alert |
| Topic: | System Administration ==> Servers ==> SPDS |
| Date Modified: | 2011-08-15 18:41:31 |
| Date Created: | 2011-08-11 08:55:46 |