VKTM publishes two sets of time: a wall clock time using a seconds interval and a higher resolution time (which is not wall clock time) for interval measurements. SMON performs many database maintenance tasks, including the following: Creates and manages the temporary tablespace metadata, Reclaims space used by orphaned temporary segments, Maintains the undo tablespace by onlining, offlining, and shrinking the undo segments based on undo space usage statistics, Cleans up the data dictionary when it is in a transient and inconsistent state, Maintains the SCN to time mapping table used to support Oracle Flashback features. Table F-1 describes Oracle Database background processes. For Oracle Database Appliance only, performs actions related to recovery of a dead instances database flash cache. The propagation sender process name is CXnn, where nn can include letters and numbers. Executes jobs assigned by the job coordinator. Ships redo from current online and standby redo logs to remote standby destinations configured for ASYNC transport. 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. For XStream Inbound servers, query V$XSTREAM_APPLY_SERVER. The V$PROCESS view lists database processes running in these container processes. Initiates automation tasks involved in managing Exadata storage. Possible processes are ASMB and AMB1-AMB3. This process is active only if Exadata Storage is used. RMSn performs a variety of tasks, including creating resources related to Oracle RAC when new instances are added to a cluster. The VKTM timer service centralizes time tracking and offloads multiple timer calls from other clients. The message is received by PING on the target instance. The dictionary is necessary for logical standby databases to interpret the redo of the new primary database. The Data Pump master (control) process is started during job creation and coordinates all tasks performed by the Data Pump job. Oracle's background check process in Latin America is performed by background screening services in each country. The database starts multiple archiver processes as needed to ensure that the archiving of filled online redo logs does not fall behind. DMON also monitors the health of the broker configuration and ensures that every database has a consistent description of the configuration. They are spawned to help the dedicated LMDn processes with various tasks when certain workloads start creating performance bottlenecks. This process performs the resizing of memory components on the instance. The Data Pump worker process is responsible for performing tasks that are assigned by the Data Pump master process, such as the loading and unloading of metadata and data. Look at the V$ tables. Tasks performed include taking Automatic Workload Repository snapshots and Automatic Database Diagnostic Monitor analysis. If you try to run XA global transactions with these processes disabled, an error is returned. The shared server then reads the data from the virtual circuit and performs the database work necessary to complete the request. MZnn is a dedicated process for a single MMON slave action. The coordinator process name is ASnn, where nn can include letters and numbers. Query V$STREAMS_APPLY_SERVER for information about the apply server background process. There can be up to 100 of these processes, named as follows: Registers the instance with the listeners. The only possible process is ASMB; AMBn processes do not run in IOS instances. VBGn can run as multiple processes, where n is 0-9. On multiprocessor systems, LGWR creates worker processes to improve the performance of writing to the redo log. In-memory populate and repopulate tasks running on Wnnn slaves are also initiated from foreground processes in response to queries and DMLs that reference in-memory enabled objects. These background processes are spawned or reused during the start of a parallel statement. Relays messages between Oracle ASM instance and Oracle ASM Proxy instance that is used by ADVM (for ACFS), Performs various background space management tasks, including proactive space allocation and space reclamation. The I/O slaves simulate the asynchronous I/O behavior when the underlying platform does not have native support for asynchronous I/O. SCRB runs in an Oracle ASM instance and coordinates Oracle ASM disk scrubbing operations. Transfers redo from current online redo logs to remote standby destinations configured for SYNC transport. Manages the rolling migration procedure for an Oracle ASM cluster. These processes work on the system notifications in parallel, offering a capability to process a larger volume of notifications, a faster response time, and a lower shared memory use for staging notifications. Query V$STREAMS_APPLY_SERVER for information about the apply server background process. Coordinates execution of tasks such as filtering duplicate block media recovery requests and performing flood control. IPC0: - IPC Service Background Process - Common background server for basic messaging and RDMA primitives based on IPC (Inter-process communication) methods. In an Oracle ASM instance, it coordinates rebalance activity for disk groups. please give your expert advice on this when time permits.. Performs Oracle ASM post-rebalance activities. SMON is resilient to internal and external errors raised during background activities. Performs synchronous tasks on behalf of LMHB. They receive and perform units of work sent from the query coordinator. 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. Search. Table F-1 describes Oracle Database background processes. Manages resources and provides resource control among Oracle RAC instances. DMON runs for every database instance that is managed by the broker. CLMN periodically performs cleanup of all the following: dead processes, killed sessions, transactions, network connections, idle sessions, detached transactions, and detached network connections that have exceeded their idle timeout. The process is created when the DG_BROKER_START initialization parameter is set to true. This background process coordinates the execution of various space management tasks, including proactive space allocation and space reclamation. Performs network communication in the shared server architecture. In previous releases, IMXT segments were dropped by foreground processes. The V$PROCESS view lists database processes running in these container processes. These processes handle requests for I/Os targeted at storage not locally accessible. MMON performs many tasks related to manageability, including taking Automatic Workload Repository snapshots and performing Automatic Database Diagnostic Monitor analysis. The possible processes are SCV0-SCV9. The default number of these processes is based on number of CPUs. . In this context, a background process is defined as any process that is listed in V$PROCESS and has a non-null value in the pname column. Possible processes include LG00-LG99. The underlying LogMiner process name is MSnn, where nn can include letters and numbers. These processes communicate with the Oracle ASM instance. The capture process name is CPnn, where nn can include letters and numbers. See Also: Oracle Database Backup and Issues I/Os to storage as part of storage calibration. 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". QMNC is the non-sharded queue master process responsible for facilitating various background activities required by AQ and Oracle Streams: time management of messages, management of nonpersistent queues, cleanup of resources, and so on. CSS monitors RDBMS instances which are connected to the Oracle ASM instance and constantly doing I/Os. Spawns Oracle background processes after initial instance startup. Action Ensure that the executable image is in the correct place with the correct protections, and that there is enough memory. But when I run same script in background, it hang up in background, nothing output. Action: Ensure that the background did not die and leave a trace file. See Also: Oracle Database Concepts and Oracle Database Administrator's Guide. EMNC is a master background process that coordinates event management and notification activity in the database, including Streams Event Notifications, Continuous Query Notifications, and Fast Application Notifications. Selects jobs that need to be run from the data dictionary and spawns job queue slave processes (Jnnn) to run the jobs. After the job is complete, the slave processes commit and then execute appropriate triggers and close the session. The shared server then reads the data from the virtual circuit and performs the database work necessary to complete the request. The LMFC process will perform actions related to scanning the dead instance's database flash cache and claim flash blocks mastered by the dead instance. See Also: Oracle Data Guard Performs Data Pump tasks as assigned by the Data Pump master process. There is one slave process per CPU on each node of the database. These processes receive, process, and send GCS requests, block transfers, and other GCS-related messages. LMON maintains instance membership within Oracle RAC. SMON is resilient to internal and external errors raised during background activities. Query the V$XSTREAM_CAPTURE and V$GOLDENGATE_CAPTURE views for information about this background process. LGWR cannot reuse and overwrite an online redo log group until it has been archived. Thus, the writes tend to be slower than the sequential writes performed by LGWR. I can not get any result and hung up in background . The dispatcher slave processes enable scaling of Direct NFS connections to a clustered NAS storage. Slave processes are numbered from 0 to the PARALLEL_MAX_SERVERS setting. There can be 1 to 100 Database Writer Processes. CJQ0 is automatically started and stopped as needed by Oracle Scheduler. ABMR and BMRn terminate after being idle for a long time. Ships redo from current online and standby redo logs to remote standby destinations configured for ASYNC transport. If an apply server cannot resolve an error, then it rolls back the transaction and places the entire transaction, including all of its messages, in the error queue. This process expels dropped disks after an Oracle ASM rebalance. See Also: Oracle Database XStream See Also: Oracle Real Application Clusters Administration and Deployment Guide, Serves as an I/O slave process spawned on behalf of DBWR, LGWR, or an RMAN backup session. A sample WORKLOAD REPOSITORY REPORT (RAC) indicate following: The dispatcher processes are enabled by the ENABLE_DNFS_DISPATCHER initialization parameter. In general, ACMS is limited to small, nonblocking state changes for a limited set of cross-instance operations. This process is automatically started on instance startup. After the shared server completes the client request, the server releases the virtual circuit back to the dispatcher and is free to handle other clients. Communicates between the Oracle ASM instance and the operating system volume driver. The ACMS process works with a coordinating caller to ensure that an operation is executed on every instance in Oracle RAC despite failures. This process runs in the database instance and is started when the database instance first begins using the Oracle ASM instance. When performing work on behalf of the Oracle Database In-Memory option, Wnnn processes execute tasks for population or repopulation of objects that are enabled for the In-Memory column store (IM columns store), and tasks that drop in-memory segments when an object is disabled for the IM columns store. Each of this type of process represents a single class of work item such as AQ notification, queue monitors, and cross process. Performs Oracle ASM disk scrubbing repair operation. LGWR writes the redo log entries sequentially into a redo log file. Performs critical tasks such as instance recovery and dead transaction recovery, and maintenance tasks such as temporary space reclamation, data dictionary cleanup, and undo tablespace management. SMON performs many database maintenance tasks, including the following: Creates and manages the temporary tablespace metadata, Reclaims space used by orphaned temporary segments, Maintains the undo tablespace by onlining, offlining, and shrinking the undo segments based on undo space usage statistics, Cleans up the data dictionary when it is in a transient and inconsistent state, Maintains the SCN to time mapping table used to support Oracle Flashback features. These processes communicate with the Oracle ASM instance. LGWR cannot reuse and overwrite an online redo log group until it has been archived. Apply servers can also enqueue a queue. Cleanup slaves assist in the cleanup of dead processes and killed sessions. GCRn processes are transient slaves that are started and stopped as required by LMHB to perform synchronous or resource intensive tasks. See Also: Oracle Database The database writes the following message to the alert log: WARNING: AQ_TM_PROCESSES is set to 0. New Background Processes that has been introduced from 12c, compared with 11.2.0.2 Database. Global Cache/Enqueue Service Heartbeat Monitor, Monitor the heartbeat of several processes. See "THREADED_EXECUTION" for more information about the THREADED_EXECUTION initialization parameter. Recovery Users Guide, Oracle Advanced Cluster File System (Oracle ACFS) CSS Process, Tracks the cluster membership in CSS and informs the file system driver of membership changes. A logical standby database becomes a primary database because of switchover or failover. The database automatically tunes the number of these processes based on the workload of XA global transactions. Writes flashback data to the flashback logs in the fast recovery area. A Bnnn slave is spawned when a disk is taken offline in an Oracle ASM disk group. Using the data dictionary view USER_SCHEDULER_JOBS, you can verify whether your job is really running. ARB0 uses the value of the ASM_POWER_LIMIT initialization parameter for the Oracle ASM instance as the maximum power for disk rebalancing. A copy of this file is maintained by the DMON process for each of the databases that belong to the broker configuration. This process is active only if Exadata Storage is used. Computes dependencies between logical change records (LCRs) and assembles messages into transactions (Reader Server), Applies LCRs to database objects or passes LCRs and user messages to their appropriate apply handlers (Apply Server). Determines which database objects will be protected by the database guard. Enterprise Manager Database Express, also referred to as EM Express, provides support for CDB. Wnnn slave processes perform work on behalf of Space Management and on behalf of the Oracle In-Memory Option. Performs remastering for cluster reconfiguration and dynamic remastering. MMNL performs many tasks relating to manageability, including session history capture and metrics computation. The number of these processes vary depending on the active database processes. When an apply server places a transaction in the error queue and commits, this transaction also has been applied. 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. This means that when one of these background processes crashes, then whoever detects the process disappearance (PMON or LGWR or CLMN possibly), will shut down the instance as it cannot function normally anymore. Assesses latencies associated with communications for each pair of cluster instances. Monitors the other background processes and performs process recovery when a server or dispatcher process terminates abnormally. Possible processes are ARB0-ARB9 and ARBA. Symptoms The Standalone Database will not start and throws error listed below. Extracts and masks bind values from workloads like SQL tuning sets and DB Replay capture files. When you start the Data Guard broker, a DMON process is created. Source:- http://docs.oracle.com/cd/E16655_01/server.121/e17615/bgprocesses.htm Some of the parameters that names have been changed, for example NSA1 (Redo transport services has been named as TTnn etc) The PL/SQL code has been fired as a background job. VKRM manages the CPU scheduling for all managed Oracle processes. Initiates background population and repopulation of in-memory enabled objects. Virtual Scheduler for Resource Manager Process, Serves as centralized scheduler for Resource Manager activity. It works with the instant recovery feature to ensure immediate data file access. INSV is created when the DG_BROKER_START initialization parameter is set to true. CKPT checks every three seconds to see whether the amount of memory exceeds the value of the PGA_AGGREGATE_LIMIT initialization parameter, and if so, takes the action described in "PGA_AGGREGATE_LIMIT". Provides transparent support for XA global transactions in an Oracle RAC environment. Worker processes execute in parallel without needing to communicate with each other. Processes a set of workload capture files. Redo log entries are generated in the redo log buffer of the system global area (SGA). Coordinates the execution of various space management tasks. They also perform distributed deadlock detections. If you try to run XA global transactions with these processes disabled, an error is returned. 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 . LSP0 is also responsible for detecting and enabling run-time parameter changes for the SQL Apply product as a whole. Optionally, a set of AUs can be chosen for error emulation. Performs Oracle ASM disk scrubbing verify operation. See Also: Oracle Database The LOG_ARCHIVE_MAX_PROCESSES initialization parameter specifies the number of ARCn processes that the database initially invokes. These membership changes are required for the file system to maintain file system consistency within the cluster. If an apply server cannot resolve an error, then it rolls back the transaction and places the entire transaction, including all of its messages, in the error queue. Rebalances data extents within an ASM disk group. FBDA also keeps track of how far the archiving of tracked transactions has progressed. The VKTM timer service centralizes time tracking and offloads multiple timer calls from other clients. When a connection becomes active, the connection broker hands off the connection to a compatible pooled server process. CTWR tracks changed blocks as redo is generated at a primary database and as redo is applied at a standby database. INSV is created when the DG_BROKER_START initialization parameter is set to true. In Database Resident Connection Pooling, clients connect to a connection broker process. In RAC, the various ARCH processes can be utilized to ensure that copies of the archived redo logs for each instance are available to the other instances in the RAC setup should they be . You can see the current amount of memory used by the background process with this query: Cause Performs Oracle ASM disk scrubbing repair operation. The time for the round trip is measured and collected. Provides database service run-time load balancing and topology information to clients. Note that if the AQ_TM_PROCESSES initialization parameter is set to 0, this process will not start. * PMON - Process Monitor process recovers failed process resources. In 19c, the background processes are grouped into three categories: mandatory, optional and slave background processes. Concepts and Oracle Database When performing work on behalf of Space Management, Wnnn processes are slave processes dynamically spawned by SMCO to perform space management tasks in the background. The process detects instance transitions and performs reconfiguration of GES and GCS resources. The default number of these processes is based on number of CPUs. These tasks include preallocating space into locally managed tablespace and SecureFiles segments based on space usage growth analysis, and reclaiming space from dropped segments. Database instances, Oracle ASM instances, Oracle RAC, Monitors an Oracle RAC cluster to manage global resources. Tracks changed data blocks as part of the Recovery Manager block change tracking feature. On a host with multiple NUMA nodes, there will be at least one Unnn process per NUMA node. After being started, the slave acts as an autonomous agent. In the shared server architecture, clients connect to a dispatcher process, which creates a virtual circuit for each connection. Services Administrator's Guide, Perform parallel execution of a SQL statement (query, DML, or DDL). The ONLINE operation is handled by XDWK. FENC receives and processes the fence request from CSSD. It also handles checkpoints, file open synchronization, and logging of Block Written records. Selects jobs that need to be run from the data dictionary and spawns job queue slave processes (Jnnn) to run the jobs. After being released, the connection is returned to the broker for monitoring, leaving the server free to handle other clients. The process is created when a Data Guard broker configuration is enabled. When you have multiple instances on a UNIX server and need to release a semaphore set for an Oracle database, you must first determine which semaphore set belongs to your crippled instance. They are spawned to help the dedicated LMDn processes with various tasks when certain workloads start creating performance bottlenecks. After the job is complete, the slave processes commit and then execute appropriate triggers and close the session. When the RDBMS instance terminates due to a failure, all the outstanding I/O's from the RDBMS instance should be drained and any new I/O's rejected. Performs cleanup of dead processes, killed sessions, killed transactions, and killed network connections. After being released, the connection is returned to the broker for monitoring, leaving the server free to handle other clients. Host processes where database processes execute as threads. The RMON process is spawned on demand to run the protocol for transitioning an ASM cluster in and out of rolling migration mode. Apply servers can also enqueue a queue. A database instance reading from an Oracle ASM disk group can encounter an error during a read. The message is received by PING on the target instance. Manages global enqueue requests and cross-instance broadcasts. After being started, the slave acts as an autonomous agent. After it finishes task execution, it automatically picks up another task from the queue. The pooled server process performs network communication directly on the client connection and processes requests until the client releases the server. RPnn are worker processes spawned by calling DBMS_WORKLOAD_REPLAY.PROCESS_CAPTURE(capture_dir,parallel_level). The local instance has immediate access to the remote snapshot file's data, while repopulation of the recovered primary data files happens concurrently. There can be up to 36 of these slave processes (LDD0-LDDz). Background processes are the processes r. Processes a set of workload capture files. The SAnn process allocates the rest of SGA in small chunks. These are the main Oracle background processes, in no particular order, as all of them are equally important: 1.Database Writer Process. Performs monitoring management tasks related to Data Guard on behalf of DMON. These processes exit when the instance is shut down or terminated. I/O slave process can be configured on platforms where asynchronous I/O support is not available. When the THREADED_EXECUTION initialization parameter is set to TRUE on Linux and UNIX, the DBW, PMON, PSP, and VKTM background processes run as operating system processes, and the other background processes run as operating system threads. 3.Checkpoint Process. Provides transparent support for XA global transactions in an Oracle RAC environment. Oracle Database Backup and Recovery User's Guide, Oracle Streams Concepts and Administration, Oracle Real Application Clusters Administration and Deployment Guide, Oracle Data Guard Concepts and Administration, Oracle Database Net Services Administrator's Guide. The LSP2 process is created as needed during startup of SQL Apply to update the list of objects that are protected by the database guard. Any issues related to background processes should be monitored and analyzed from the trace files generated and the alert log. Processes fence requests for RDBMS instances which are using Oracle ASM instances. GCRn processes are transient slaves that are started and stopped as required by LMHB to perform synchronous or resource intensive tasks. In Oracle RAC, DIAG performs global diagnostic dumps requested by remote instances. Job slave processes are created or awakened by the job coordinator when it is time for a job to be executed. The database writes the following message to the alert log: WARNING: AQ_TM_PROCESSES is set to 0. The ASM RBAL background process coordinates and spawns one or more of these slave processes to recover aborted ASM transactional operations. For GoldenGate Integrated Replicat, query V$GG_APPLY_SERVER. LMON maintains instance membership within Oracle RAC. SQL script file: t.sql-----select sysdate from dual; quit;-----I can get result when run this command :-----sql U/P@10.224.141.137:8521/nmsb @t.sql. System might be adversely affected. ARCn processes exist only when the database is in ARCHIVELOG mode and automatic archiving is enabled, in which case ARCn automatically archives online redo log files. NSSn can run as multiple processes, where n is 1-9 or A. Background processes consolidate functions that would otherwise be handled by multiple database programs running for each user process. CTWR tracks changed blocks as redo is generated at a primary database and as redo is applied at a standby database. The local instance has immediate access to the remote snapshot file's data, while repopulation of the recovered primary data files happens concurrently. The IMCO background process initiates population (prepopulation) of in-memory enabled objects with priority LOW/MEDIUM/HIGH/CRITICAL. The database event management and notification load is distributed among the EMON slave processes. QMNC is the non-sharded queue master process responsible for facilitating various background activities required by AQ: time management of messages, management of nonpersistent queues, cleanup of resources, and so on. Membership changes result from adding and dropping disks, whereas disk status changes result from taking disks offline or bringing them online. RVWR writes flashback data from the flashback buffer in the SGA to the flashback logs. Query V$STREAMS_APPLY_READER, V$XSTREAM_APPLY_READER, and V$GG_APPLY_READER for information about the reader server background process. After each process is finished processing its assigned files, it exits and informs its parent process. LMHB monitors the CKPT, DIAn, LCKn, LGnn, LGWR, LMDn, LMON, LMSn , and RMSn processes to ensure they are running normally without blocking or spinning. PMON periodically performs cleanup of all the following: Detached transactions that have exceeded their idle timeout, Detached network connections which have exceeded their idle timeout.
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