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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/256986/ )Description of the Microsoft Windows registry
If you try to connect to SQL Server 2000 Analysis Services and you have installed Analysis Services Service Pack 3 (SP3), the connection fails. You may receive one of the following error messages:
Error message 1
Cannot open connection to Analysis server '<Server Name>'.
Error message 2
Unable to open connection.
The operation requested failed due to timeout
Error message 3In the Application event log:
If you are already connected to the Analysis Services server, the connection may be lost. Additionally, you receive the following error message:
The memory conservation threashold was exceeded by more than 12.5 percent for an extended period.
unable to open cellset. The operation requested failed due to timeout error
This problem occurs because in Analysis Services SP3, the connections to Analysis Services services are blocked when the memory that the msmdsrv process uses exceeds 112.5 percent of the memory conservation threshold value (HighMemoryLimit).
You receive the additional error message if the cleaner thread is not able to release memory within a timeout period. The existing connection is lost to avoid a system hang.
To work around this problem, set the memory conservation threshold to a value that is greater than the memory that the msmdsrv process uses. To set the memory conservation threshold, modify the HighMemoryLimit registry key value. To do so, follow these steps.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
Note Before you follow these steps, make a note of the memory that the msmdsrv process uses immediately after you start Analysis Services.
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/301334/ )Connection timeout occurs when connecting to a remote OLAP server using an ADO connection
(https://support.microsoft.com/kb/304213/ )Different kinds of Analysis Services timeouts
(https://support.microsoft.com/kb/306039/ )Long running OLAP queries do not return data when connected through HTTP
(https://support.microsoft.com/kb/295443/ )How to enable Analysis Server to use 3 GB of RAM