What is cost-based optimizer in SAP BC-DB - Database Interface, Database Platforms?

SAP Term: cost-based optimizer

• Component: BC-DB

• Component Name: Database Interface, Database Platforms

• Description: A program that works out the best access path for queries on database data. The cost-based optimizer is part of the database management system. Its function is to reduce the time required to access database data, thereby reducing cost. The update statistics function, which can be performed from the Computing Center Management System in the SAP System,makes sure that the statistics required by the optimizer are up-to-date. Without up-to-date statistics, the access path generated by the optimizer may not be the best available.

Smart SAP Assistant

• Key Concepts: 
  Cost-based optimizer is a feature of the SAP BC-DB Database Interface that allows users to optimize their database queries for cost efficiency. It uses a cost-based approach to determine the most efficient way to execute a query, taking into account factors such as the number of tables involved, the number of rows in each table, and the type of data being accessed. This helps to reduce the amount of time and resources needed to execute a query, resulting in improved performance.
  
  How to use it: 
  The cost-based optimizer can be enabled by setting the parameter “optimize_cost” in the SAP BC-DB Database Interface configuration file. Once enabled, it will automatically optimize queries for cost efficiency. It is important to note that this feature should only be used when necessary, as it can have an impact on performance if used too often.
  
  Tips & Tricks: 
  When using the cost-based optimizer, it is important to consider the type of data being accessed and the number of tables involved in the query. This will help ensure that the most efficient query plan is chosen for each query. Additionally, it is important to monitor performance after enabling this feature, as it can have an impact on overall system performance if used too often.
  
  Related Information: 
  For more information on using the cost-based optimizer, please refer to SAP’s documentation on BC-DB Database Interface configuration parameters. Additionally, there are several online resources available that provide tips and tricks for optimizing database queries for cost efficiency.