Working with database files

 

This topic describes the various tasks that can be used to ensure that files are used effectively.

• What resources the system has allocated for each file type.

• How to move data between different files such as device and database.

• The options that exist when an application is used for accessing a file.

• The levels of support that exist for shared files.

• The process of changing file attributes such as file name, device name or remote location name.

• File resources allocation
  Resources are those parts of the system that are required by a job or task, including main storage, devices, the processing unit, programs, files, libraries, and folders. When you write a high-level language program, you should be aware of what resources the system has allocated for each file type.

• Copying files
  With the copy function on the i5/OS operating system, you can copy physical and logical files, copy members and records, copy complex objects, and copy files between systems.

• Opened files
  When you want an application to use a file, you do so by referring to that file by name. The file description for that file then controls how the program and the system interact.

• Shared files
  File management on the i5/OS operating system provides several levels of support for shared files. Files can be shared among many users, many jobs, or many programs within the same job.

• Overrides
  You can use overrides to temporarily change a file name, a device name associated with the file, or some of the other attributes of a file.

 

Parent topic:

Database file management