CA ERwin Model Manager Implementation Guide

Database ConfigurationDatabase ConfigurationProper database configuration is essential to the smooth operation and goodperformance of an Oracle database. You can use the configuration optionsdescribed to optimize the processing of your Oracle server.Maximum Number of ProcessesOracle must be preconfigured at startup with a maximum number of processesthat can access the database. The parameter that controls the maximumnumber of processes, called PROCESSES, is defined in the INIT.ora orINIT.ora file. It should be set to the maximum potential number ofconcurrent users plus seven. The additional seven are for Oracle backgroundprocesses that must also access the database. Setting the number ofprocesses at a lower value can prevent some users from accessing the serverduring peak usage times. Setting the number of processes at a higher valuecan waste a small amount of system memory resources.Shared PoolThe shared pool is an area of Oracle memory that includes two mainstructures:■■The library cache, which stores parsed SQL and PL/SQL statementsThe dictionary cache, which stores the Oracle data dictionary (or Oraclemetadata)The SHARED_POOL_SIZE parameter is defined in the INIT.ora orINIT.ora file and is used to regulate the size of the shared pool. Set theSHARED_POOL_SIZE parameter to a minimum of 3500000 (3.5 million).Setting the shared pool to a smaller value can degrade performance, forcingOracle to do disk I/O to retrieve objects that cannot fit in the shared pool. Alarger shared pool may be required, depending on the size and number ofmodels and the number of users.58 Implementation Guide