The data source used by IBM Cognos 8 is usually a relational database management system, such as IBM DB2, Microsoft SQL Server, or Oracle. To ensure that IBM Cognos 8 continues to perform well, it is important to maintain the performance of your database. This means optimizing it for querying, reporting, and analyzing. If IBM Cognos 8 and other applications demand more of a database than it can provide, or queries are too large for a database to handle efficiently, you may experience increased response times and degradation in IBM Cognos 8 performance and scalability.
For information about tuning your database, see its documentation.