Mandatory Background Processes Optional Background Processes Slave Processes Processes fence requests for RDBMS instances which are using Oracle ASM instances. When instructed by the user, FMON builds mapping information and stores it in the SGA, refreshes the information when a change occurs, saves the information to the data dictionary, and restores it to the SGA at instance startup. Auto BMR Background Process. Signals DBWn at checkpoints and updates all the data files and control files of the database to indicate the most recent checkpoint. Possible processes include ARC0-ARC9 and ARCa-ARCt. Performs manageability tasks on behalf of MMON. ARCn processes exist only when the database is in ARCHIVELOG mode and automatic archiving is enabled, in which case ARCn automatically archives online redo log files. In an Oracle ASM instance, it coordinates rebalance activity for disk groups. LGWR writes the redo log entries sequentially into a redo log file. Clusters Administration and Deployment Guide, Serves as an I/O slave process spawned on behalf of DBWR, LGWR, or an RMAN backup session. The names of the first 36 Database Writer Processes are DBW0-DBW9 and DBWa-DBWz. oracle@zdb010108:/tmp$ srvctl start database -d biet8 PRCR-1079 : Failed to start resource ora.biet8.db CRS-5017: The resource action "ora.biet8.db start" encountered the following error: ORA-01617: cannot mount: 2 is not a valid thread number . Parallel Query has two components: a foreground process that acts as query coordinator and a set of parallel slaves (Pnnn) that are background processes. Atomic Control File to Memory Service Process, Coordinates consistent updates to a control file resource with its SGA counterpart on all instances in an Oracle RAC environment. This background process is used with Data Masking and Real Application Testing. Monitors the other background processes and performs process recovery when a server or dispatcher process terminates abnormally. Slave processes are numbered from 0 to the PARALLEL_MAX_SERVERS setting. See Also: Oracle Database Backup and Uninstallation of APEX from a default Oracle 11gR2 database For Oracle Database Appliance only, in the event of a instance crash, the surviving instance will recover the dead instance's database flash cache. SCRB runs in an Oracle ASM instance and coordinates Oracle ASM disk scrubbing operations. Also, the processes help perform two-phase commit for global transactions anywhere in the cluster so that an Oracle RAC database behaves as a single system to the externally coordinated distributed transactions. The CRnn processes are threads and the process ID part will be the same as the owning LMSs process ID. ABMR and BMRn terminate after being idle for a long time. They are also helper processes for LMS to handle non-critical work from global cache service. The VKTM timer service centralizes time tracking and offloads multiple timer calls from other clients. The LSP1 process is spawned on a logical standby database that is intended to become the new primary database. Coordinates the execution of various space management tasks. Database Apply Process Coordinator Process, Obtains transactions from the reader server and passes them to apply servers. Emulates I/O errors on Oracle ASM disks through named events. Performs database event management and notifications. Services Administrator's Guide, Perform parallel execution of a SQL statement (query, DML, or DDL). Host processes where database processes execute as threads. The background processes consolidate functions that would otherwise be handled by multiple Oracle Database programs running for each user process. Host processes where database processes execute as threads. Virtual Scheduler for Resource Manager Process, Serves as centralized scheduler for Resource Manager activity. Maintains cluster membership on behalf of the Oracle ASM volume driver. See Also: Oracle Data Guard Wnnn slave processes perform work on behalf of Space Management and on behalf of the Oracle In-Memory Option. CSnn slave processes are started on execution of the DBMS_RESOURCE_MANAGER.CALIBRATE_IO() procedure. Manages and monitors a database that is part of a Data Guard broker configuration. Apply servers can also enqueue a queue. The LSP1 process is spawned on a logical standby database that is intended to become the new primary database. The propagation sender process name is CXnn, where nn can include letters and numbers. CJQ0 starts only as many job queue processes as required by the number of jobs to run and available resources. In the shared server architecture, clients connect to a dispatcher process, which creates a virtual circuit for each connection. FBDA also keeps track of how far the archiving of tracked transactions has progressed. Symptoms On systems where Exafusion is enabled, the IPC0 background process is seen with a high RSS (resident set size) memory usage in OS commands like "top" and "ps". These background slave processes perform tasks on behalf of a coordinating process running in another cluster instance. ASMB runs in Oracle ASM instances when the ASMCMD cp command runs or when the database instance first starts if the server parameter file is stored in Oracle ASM. When instructed by the user, FMON builds mapping information and stores it in the SGA, refreshes the information when a change occurs, saves the information to the data dictionary, and restores it to the SGA at instance startup. This process membership in the cluster as an I/O-capable client on behalf of the Oracle ASM volume driver. In-memory populate and repopulate tasks running on Wnnn slaves are also initiated from foreground processes in response to queries and DMLs that reference in-memory enabled objects. The local instance has immediate access to the remote snapshot file's data, while repopulation of the recovered primary data files happens concurrently. VDBG handles requests to lock or unlock an extent for rebalancing, volume resize, disk offline, add or drop a disk, force and dismount disk group to the Dynamic Volume Manager driver. On completion of individual checkpoint requests, CKPT updates data file headers and control files to record most recent checkpoint. The Database Writer Process performs multiblock writes when possible to improve efficiency. Starting with Oracle Database 19c, IMXT (In-Memory External Table) segments are dropped by the IMCO background process. Monitors idle connections and hands off active connections in Database Resident Connection Pooling, Performs direct NFS I/O for database processes. The process terminates itself after being idle for a long time. Server processes perform work based on a client request. Ships redo from current online and standby redo logs to remote standby destinations configured for ASYNC transport. JPn patches and updates the Java in the database classes. The names of the 37th through 100th Database Writer Processes are BW36-BW99. After each process is finished processing its assigned files, it exits and informs its parent process. The database selects an appropriate default setting for the DB_WRITER_PROCESSES parameter or adjusts a user-specified setting based on the number of CPUs and processor groups. A logical standby database becomes a primary database because of switchover or failover. LDDn processes are slave processes spawned on demand by LMDn processes. When the shared server must send data to the client, the server writes the data back into the virtual circuit and the dispatcher sends the data to the client. The underlying LogMiner process name is MSnn, where nn can include letters and numbers. Membership changes result from adding and dropping disks, whereas disk status changes result from taking disks offline or bringing them online. ACFS delivers CSS membership changes to the Oracle cluster file system. MMON performs many tasks related to manageability, including taking Automatic Workload Repository snapshots and performing Automatic Database Diagnostic Monitor analysis. VKTM acts as a time publisher for an Oracle instance. Onnn slave processes are spawned on demand. See Also: Oracle Database Query V$PROPAGATION_SENDER for information about a propagation sender. SMON is resilient to internal and external errors raised during background activities. System might be adversely affected. GMON monitors all the disk groups mounted in an Oracle ASM instance and is responsible for maintaining consistent disk membership and status information. An apply server receives the transactions from the coordinator background process, and either applies database changes in LCRs or sends LCRs or messages to apply handlers. The LOG_ARCHIVE_MAX_PROCESSES initialization parameter specifies the number of ARCn processes that the database initially invokes. Database instances, Logical Standby, Oracle Streams, XStream Outbound servers, Oracle GoldenGate, Monitors idle connections and hands off active connections in Database Resident Connection Pooling, Transfers redo from current online redo logs to remote standby destinations configured for SYNC transport. Executes jobs assigned by the job coordinator. In this context, a background process is defined as any process that is listed in V$PROCESS and has a non-null value in the pname column. Cleanup slaves assist in the cleanup of dead processes and killed sessions. RVWR also creates flashback logs and performs some tasks for flashback log automatic management. You can disable these processes by setting the parameter to 0. Maintains cluster membership on behalf of the Oracle ASM volume driver. GCRn processes are transient slaves that are started and stopped as required by LMHB to perform synchronous or resource intensive tasks. The time for the round trip is measured and collected. If required, MARK can also be started on demand when disks go offline in the Oracle ASM redundancy disk group. LMHB monitors the CKPT, DIAn, LCKn, LGnn, LGWR, LMDn, LMON, LMSn , and RMSn processes to ensure they are running normally without blocking or spinning. DMON also monitors the health of the broker configuration and ensures that every database has a consistent description of the configuration. Any issues related to background processes should be monitored and analyzed from the trace files generated and the alert log. Data Guard Broker Fast Start Failover Pinger Process, Maintains fast-start failover state between the primary and target standby databases. SCVn acts as a slave process for SCRB and performs the verifying operations. The ACMS process works with a coordinating caller to ensure that an operation is executed on every instance in Oracle RAC despite failures. The background process usually is a child process created by a control process for processing a computing task. Global Cache/Enqueue Service Heartbeat Monitor, Monitor the heartbeat of several processes. DIAG performs diagnostic dumps requested by other processes and dumps triggered by process or instance termination. Any changes in the data are managed between the instance's DBW processes and RPOP to ensure the latest copy of the data is returned to the user.

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