April 1999
Intermediate to advanced
584 pages
23h 17m
English
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Standard Background Processes
Depending on the options installed and the specific configuration of an Oracle installation, many background processes may be required. There is, however, a core set of background processes required for every Oracle instance, which are found in any machine on which Oracle is running, from Personal Oracle on an Intel-based PC to the largest Unix server. The failure of any one of these processes indicates failure of the entire Oracle instance; when such failures occur, the instance must be restarted.
The standard background processes include:
Database Writer (DBWR or DBWn)
Log Writer (LGWR)
System Monitor (SMON)
Process Monitor (PMON)
Checkpoint (CKPT)
Archiver (ARCH)
Shared Server (Snnn)
Dispatcher (Dnnn)
Recoverer (RECO)
Lock (LCKn)
Parallel Query (Pnnn)
Queue Monitor (QMNn) (Oracle8 only)
Job Queue (SNPn)
The following sections briefly describe these processes.
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