Illustration strep023.htm shows the details of the primary database `ps1.net` Streams configuration, including the following mechanisms:

- One queue that is used by the capture process, propagations, and apply processes.

- A capture process that captures changes in the redo log and converts relevant changes into LCRs, which it enqueues into a queue. The capture process captures a change regardless of whether its tag is `NULL`.

- One propagation that propagates captured changes to `ps2.net`. The propagation propagates all changes except changes with a tag of `'2'`.

- One propagation that propagates captured changes to `ps3.net`. The propagation propagates all changes except changes with a tag of `'3'`.

- One propagation that propagates captured changes to `ps4.net`. The propagation propagates all changes except changes with a tag of `'4'`.

- One apply process that applies changes from `ps2.net`. These changes have a tag of `'2'` in the redo log.

- One apply process that applies changes from `ps3.net`. These changes have a tag of `'3'` in the redo log.

- One apply process that applies changes from `ps4.net`. These changes have a tag of `'4'` in the redo log.

- One propagation to propagate locally captured LCRs to `mult2.net` and another propagation to propagate locally captured LCRs to `mult3.net`.