Oracle 10g Background processes

- ARCn : (ASM) Rebalance working process , it rebalances extents.

- Orb: Rebalance ASM data extent movements. There can be many of this at the same time.

- RBAL: This is the ASM Rebalance Master disk manager, open all disks under each disk group and make them
available to the various clients. It also creates the rebalance plan to move extents.

- OSMB: (ASM) helps to manage the drive storage.

- ASMB: (ASM) Responsible to communicate the database Instance to the ASM Instance provides the heartbeat to the ASM instance.

Server Side Optional

- RECO: Helps to recover distributed Transactions.

- ORA_CJQ0_: Job queue coordinator checks the log and spawns J### processed

- QMNC: AQ Coordinator, used to manage Oracle Streams Advance Queuing.

- ARCH, ARCn: Copies redo logs to archive logs destination.

- CTWR: Block Change Tracking Writer.

- ORA_D###_: Oracle Dispatchers processed

- ORA_J###_: Job queue process

- ORA_MMAN_: Memory manager, used for the manager of the automatic shared memory.

- ORA_MMNL_: Helps collecting metrics and information about sessions.

- ORA_MMON_: On charge of collecting stats.

- ORA###_: Dedicated server (user process).

- ORA_RVWR_: Recovery Writer (Flashback Database).

- ORA_S###_: Oracle Shared Server Process (Multi Threaded Server)

- ORA_P###_: Parallel Query Slaves Process

- ORA_LNS#_: Network Server.

Other Processes

- ORA_AQ_: Sends notifications when messages arrive into the queues (Advance Queue).

- ORA_Q###_: Queue Process.

- ORA_DMON_: Data Guard Broker Process.

- ORA_SNP###_: Snapshot process (Data Guard).

- ORA_TRWR_: Advance Queuing Time Manager.

- ORA_WMON_: Wakeup monitor process.

Undocumented Server Side Extra

- ORA_FMON_: Manage mapping information when using FILE_MAPPING

Standby Mode

- ORA_LSP0_: Logical Standby

- ORA_LSP1_: Dictionary builds process for Logical Standby

- ORA_LSP2_: Set Guard Standby information for logical Standby.

- ORA_DMON_: Data Guard Broker Monitor Process.

- ORA_RSM#_: Data Guard Broker Resource Guard process.

- ORA_INSV_: Data Guard Broker Instance slave process

- ORA_NSV#_: Data Guard Broker Net Slave Process.