# Maintenance Workers (The Cleaning Crew) These are the background workers responsible for keeping the Cafe clean and the ledgers organized. - **AutoVacuum**: The cleaning crew that removes dead tuples from the ledger. ![[AutoVacuumMain]] - **Checkpointer & BgWriter**: The staff who move scribbled notes from the Diary (WAL) to the permanent filing cabinets (Data Files). ![[CheckpointerMain]] ![[BgWriterMain]] ![[BgWriterHibernate]] - **Archiver & SysLogger**: The record-keepers who store old Diary pages and log complaints. ![[ArchiverMain]] ![[SysLoggerMain]]