Solution Guide for Migrating Oracle on UNIX to SQL Server - Willy .Net

76Developing: Databases — <strong>Migrating</strong> the Database Architecturemanagement is similar to SGA sizing in <strong>Oracle</strong> but without the complications of tuning theindividual cache components. To configure SQL Server to use more than 3 GB of memory using T-SQL,enter the following commands:USE mastersp_configure 'show advanced option', 1RECONFIGUREGOsp_configure 'awe enabled', 1RECONFIGUREGOsp_configure 'max server memory', 6000RECONFIGUREGOBecause the memory requirements of a SQL Server instance are not the same as anequivalent <strong>Oracle</strong> instance, the SQL Server memory size has to be tuned during amigration. The following Per<strong>for</strong>mance Monitor counters can be used to check the amountof memory SQL Server is using:● SQL Server: Buffer Manager: Total Pages● SQL Server: Memory Manager: Total Server Memory (KB)● Process: Working SetThe dbcc memorystatus command can be used to view in<strong>for</strong>mation about memoryallocation. For more in<strong>for</strong>mation about memory usage and this command, refer tohttp://support.microsoft.com/?id=271624.The LOCK_SGA initialization parameter can be implemented in SQL Server using setworking set size. The allocated memory stays in physical memory and improvesper<strong>for</strong>mance because swapping is avoided. However, care should be taken thatallocating a fixed amount of memory to SQL Server does not impact the needs of otherapplications running on the same server.Set the CPU AffinitySQL Server has the capability of defining CPU affinity where CPUs can be dedicated toan instance. This can be controlled using the affinity mask configuration setting orEnterprise Manager. The priority boost configuration setting can be used to prioritizethreads. SQL Server SP1 has added an IO_affinity_mask switch, which can used atinstance startup to reserve CPUs to handle disk I/O associated with the instance. Use ofthe IO_affinity_mask configuration setting is only recommended <strong>for</strong> machines with morethan 16 CPUs.For more in<strong>for</strong>mation on setting up the I/O affinity mask, refer tohttp://support.microsoft.com/?kbid=298402.