Data recording actions are the core DTrace actions. Each of these actions records data to the principal buffer by default, but each action can also be used to record data to speculative buffers. See Chapter 5, Buffers and Buffering and Chapter 7, Speculative Tracing for more details on the principal buffer and speculative buffers.

The following descriptions refer only to the directed buffer, indicating that data is recorded either to the principal buffer or to a speculative buffer if the action follows a speculate.