Utility Processes

Background writer − Writes dirty data blocks to disk 

WAL writer − Flushes write-ahead log to disk 

Checkpointer process − Automatically performs a checkpoint based on config parameters 

Autovacuum −It performs automatic operation which includes Auto vacuuming and Analyze. In other words, helps to recover free space for reuse 

Logging collector (log writer) − Routes log messages to syslog, eventlog, or log files 

Stats collector − Collects usage statistics by relation and block

Archiver − Archives write-ahead log files from WAL segments area to the Archived WAL area