Background Processes

Background Processes are further divided into

                1.Mandatory Background Processes

DBWR : DataBase Writer

                             LGWR : LOG Writer

                             CKPT : CheckPoint

                             SMON : System Monitor

                             PMON : Process Monitor

                             RECO : Recoverer

                2.Optional Background Processes

                             ARCH : Archiever

                             CJQN : Coordinated Job Queue Process

                             MMON : Memory Monitor

                             MMAN : Memory Manager

                             ASMB : ASM Background Process

                             RBAL : ReBalance Master

                             CTWR : Change Track Writer

                             RVWR : Recovery Writer

For the functionality of the instance, all the mandatory background processes should be up and running.

Note : If any of the background process gets terminated, instance goes down automatically.

All the optional background processes are optional and depending on the feature that we enable, respective background process gets enabled.