CA ERwin Model Manager Implementation Guide

Server-Level Tuning ParametersDatabase PlacementCA ERwin MM databases are written to in bursts of activity. Stored proceduresand bulk insert statements are used to minimize overhead when saving data toMicrosoft SQL Server. To optimize performance, place the database on lowactivity Microsoft SQL Server files. If possible, place the log and data segmentson different physical drives to reduce contention between log writes anddatabase reads.Data RedundancyMake sure that the transaction log is mirrored on a separate drive to maximizerecoverability of the database. If the up-time of the database is consideredcritical, mirror the database and the transaction logs; you can also mirror theother Microsoft SQL Server files. Consider OS mirroring to speed the mirroringprocess and make it easier to manage.Server-Level Tuning ParametersYou should perform the following server-level tuning tasks:■■■Configure Microsoft SQL Server to use as much memory as possible.Allocating more memory to the Microsoft SQL Server caching mechanismsmeans less physical reads from the disk and improved database queryperformance.Allow several megabytes of disk space for the procedure cache because CAERwin MM uses many stored procedures.Configure two additional user connections for each simultaneous CA ERwinMM user. Two connections per session are used.The following shows the recommended configuration parameters for aMicrosoft SQL Server running CA ERwin MM:Parameter Type Recommended Value Notesmemory (Sybase11: "totalmemory")512 MB minimumNote: 1 GB isrecommendedMore memory implies lessphysical I/Oprocedural cache 30 percent CA ERwin MM is storedprocedure intensiveuser connections2 times the number ofconcurrent sessionsAdd this value to existinguser connection values50 Implementation Guide