The data recording actions comprise the core DTrace actions. Each of these actions records data to the principal buffer by default, but each action may also be used to record data to speculative buffers. See Chapter 5, Buffers and Buffering for more details on the principal buffer. See Chapter 7, Speculative Tracing for more details on speculative buffers. The descriptions in this section 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.