Problem Note 42667: Empty results from a non empty crossjoin query might result in slow performance from the SAS® OLAP Server
When a non empty crossjoin returns an empty set, the SAS OLAP Server cannot optimize the query because optimization might result in incorrect or invalid data. Because the query is not optimized, performance is negatively impacted under certain conditions. For example, results will return more slowly if the dimensions that are included in the crossjoin are of high cardinality (significantly greater than 100 unique values), or if there are a large number of calculated measures on the opposite axis from the crossjoin.
Limiting the number of calculated measures in a single query or designing a cube that avoids direct access to high cardinality levels should help to avoid this behavior.
Operating System and Release Information
| SAS System | SAS OLAP Server | z/OS | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Microsoft® Windows® for 64-Bit Itanium-based Systems | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Microsoft Windows Server 2003 Datacenter 64-bit Edition | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Microsoft Windows Server 2003 Enterprise 64-bit Edition | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Microsoft Windows XP 64-bit Edition | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Microsoft Windows 2000 Advanced Server | 9.1 TS1M3 SP4 | |
| Microsoft Windows 2000 Datacenter Server | 9.1 TS1M3 SP4 | |
| Microsoft Windows 2000 Server | 9.1 TS1M3 SP4 | |
| Microsoft Windows 2000 Professional | 9.1 TS1M3 SP4 | |
| Microsoft Windows NT Workstation | 9.1 TS1M3 SP4 | |
| Microsoft Windows Server 2003 Datacenter Edition | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Microsoft Windows Server 2003 Enterprise Edition | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Microsoft Windows Server 2003 Standard Edition | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Microsoft Windows XP Professional | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Windows Vista | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Windows Vista for x64 | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| 64-bit Enabled AIX | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| 64-bit Enabled HP-UX | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| 64-bit Enabled Solaris | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| HP-UX IPF | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Linux | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Linux on Itanium | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| OpenVMS Alpha | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Solaris for x64 | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
| Tru64 UNIX | 9.1 TS1M3 SP4 | 9.3 TS1M2 |
*
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: | high |
| Date Modified: | 2012-02-28 19:13:50 |
| Date Created: | 2011-03-11 12:12:48 |
