Logging during normal database operation (online operational state) is called online logging. During online logging, the database system logs all modifying SQL statements of the transactions, meaning that log entries are written.
Online logging is subdivided as follows:
· History Management (only for liveCache database instances)
Online logging has active components (tasks) and passive components (storage units.)
|
Active Components |
Passive Components |
Redo Log Management |
User tasks that carry out transactions |
|
Undo Log Management |
User tasks |
|
History Management |
User tasks |