Application design tips for database performance

 

There are some design tips that you can apply when designing SQL applications to maximize your database performance.

• Use live data
  The term live data refers to the type of access that the database manager uses when it retrieves data without making a copy of the data. Using this type of access, the data, which is returned to the program, always reflects the current values of the data in the database. The programmer can control whether the database manager uses a copy of the data or retrieves the data directly. This is done by specifying the allow copy data (ALWCPYDTA) parameter on the precompiler commands or on the Start SQL (STRSQL) command.

• Reduce the number of open operations
  The SQL data manipulation language statements must do database open operations in order to create an open data path (ODP) to the data. An open data path is the path through which all input/output operations for the table are performed. In a sense, it connects the SQL application to a table. The number of open operations in a program can significantly affect performance.

• Retain cursor positions
  You can improve performance by retaining cursor positions.

 

Parent topic:

Performance and query optimization