Symptoms. After a 5 minute period of inactivity, this process will shut itself down. Registers the instance with the listeners. The pooled server process performs network communication directly on the client connection and processes requests until the client releases the server. A minimum of three MSnn processes work as a group to provide transactions to a LogMiner client, for example, a logical standby database or a database capture. The number of blocks written in a multiblock write varies by operating system. If the query is a GV$ query, then these background processes are numbered backward, starting from PPA7. This process handles the extraction of redo and coordinates the application of that redo on a physical standby database. ABMR and BMRn terminate after being idle for a long time. Thanks Sheik DECLARE l_sql long; l_job number; l_return Varchar2 (32767) ; l_messages dbms_output.chararr; l_numlines integer := 1000000; Begin In an Oracle RAC database, the SMON process of one instance can perform instance recovery for other instances that have failed. Database instances, XStream Outbound servers, XStream Inbound servers, GoldenGate Integrated Replicat, Automatic Block Media Recovery Slave Pool Process, Fetches blocks from a real-time readable standby database. This is a fully automated process, that basically does a diff on many important sys dictionary objects from this release with the previous one. See the Long Description for MZnn in this table for more information about the MZnn processes. The database writes the following message to the alert log: WARNING: AQ_TM_PROCESSES is set to 0. Worker processes execute in parallel without needing to communicate with each other. Persistent Cluster Flash Cache Background Process, For Oracle Data Appliance only, this process performs actions related to recovery of a dead instance's database flash cache. Resolves distributed transactions that are pending because of a network or system failure in a distributed database. The names for CRnn processes will have the format CR0n__. They receive and perform units of work sent from the query coordinator. Common background server for basic messaging and RDMA primitives based on IPC (Inter-process communication) methods. For XStream Inbound servers, query V$XSTREAM_APPLY_SERVER. The DB_WRITER_PROCESSES initialization parameter specifies the number of Database Writer Processes. Assesses latencies associated with communications for each pair of cluster instances. Job slaves gather all the metadata required to run the job from the data dictionary. Initiates automation tasks involved in managing Exadata storage. Every 30 seconds the process processes and publishes run-time load-balancing information and keeps the topology information current. Executes jobs assigned by the job coordinator. 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 database automatically tunes the number of these processes based on the workload of XA global transactions. See Also: Oracle Data Guard Concepts and Administration, Reads redo log files and translates and assembles into transactions. Signals DBWn at checkpoints and updates all the data files and control files of the database to indicate the most recent checkpoint. When a transaction that modifies a tracked table commits, FBDA stores the pre-image of the rows in the archive. VKRM manages the CPU scheduling for all managed Oracle 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. VKTM acts as a time publisher for an Oracle instance. DLM Statistics Collection and Management Slave, Collects and manages statistics related to global enqueue service (GES) and global cache service (GCS). Scripting on this page enhances content navigation, but does not change the content in any way. There can be up to 36 of these slave processes (LDD0-LDDz). Database Apply Process Coordinator Process, Obtains transactions from the reader server and passes them to apply servers. LMDn processes enqueue resources managed under Global Enqueue Service. Administrators Guide. This slave exists only if DLM statistics collection is enabled. See Also: Oracle Database Backup and Recovery User's Guide, Tracks the cluster membership in CSS and informs the file system driver of membership changes. If the query is a GV$ query, then these background processes are numbered backward, starting from PPA7. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site It is only started for Oracle Real Application Clusters (Oracle RAC) databases, and one of the database instances is responsible for patching the Java in the database objects. After being started, the slave acts as an autonomous agent. Performs automation tasks requested by XDMG. Processes a set of workload capture files. This process performs the resizing of memory components on the instance. Wnnn processes are utilized by the IMCO background process for prepopulation of in-memory enabled objects with priority LOW/MEDIUM/HIGH/CRITICAL, and for repopulation of in-memory objects. DMON interacts with the local database and the DMON processes of the other databases to perform the requested function. Performs network communication in the shared server architecture. For examples, LCKn manages library and row cache requests. RMSn performs a variety of tasks, including creating resources related to Oracle RAC when new instances are added to a cluster. 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. These container processes are created only when the THREADED_EXECUTION initialization parameter is set to TRUE. DIAG performs diagnostic dumps requested by other processes and dumps triggered by process or instance termination. The dispatcher processes are enabled by the ENABLE_DNFS_DISPATCHER initialization parameter. For mulitenant container databases (CDBs), the process updates each pluggable database (PDB) individually. DMON also monitors the health of the broker configuration and ensures that every database has a consistent description of the configuration. 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. The process detects instance transitions and performs reconfiguration of GES and GCS resources. LGnn - Log Writer Worker Oracle's background check process in Latin America is performed by background screening services in each country. Captures database changes from the redo log by using the infrastructure of LogMiner. The GLOBAL_TXN_PROCESSES initialization parameter specifies the number of GTXn processes, where n is 0-9 or a-j. The DBMS_STORAGE_MAP package enables you to control the mapping operations. The dictionary is necessary for logical standby databases to interpret the redo of the new primary database. LGWR writes the redo log entries sequentially into a redo log file. At timed intervals, the local RECO attempts to connect to remote databases and automatically complete the commit or rollback of the local portion of any pending distributed transactions. SCRB runs in an Oracle ASM instance and coordinates Oracle ASM disk scrubbing operations. In an Oracle ASM instance, it coordinates rebalance activity for disk groups. Patches and updates the Java in the database classes. RPnn are worker processes spawned by calling DBMS_WORKLOAD_REPLAY.PROCESS_CAPTURE(capture_dir,parallel_level). 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) Data Guard Broker Fast Start Failover Pinger Process, Maintains fast-start failover state between the primary and target standby databases. * PMON - Process Monitor process recovers failed process resources. 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. These slave processes are transient as they are started on demand and they can be shutdown when no longer needed. Starting with Oracle Database 19c, IMXT (In-Memory External Table) segments are dropped by the IMCO background process. The Data Pump master (control) process is started during job creation and coordinates all tasks performed by the Data Pump job. When the reader server finishes computing dependencies between LCRs and assembling transactions, it returns the assembled transactions to the coordinator process. The possible processes are SCV0-SCV9. In addition to managing LogMiner and Apply processes, LSP0 is responsible for maintaining inter-transaction dependencies and appropriately scheduling transactions with applier processes. The coordinator process name is APnn, where nn can include letters and numbers. Symptoms Wait event "RMA: IPC0 completion sync" is in Top Timed Events in AWR report on a fresh 12.2 Real Application Cluster environment. LMHB monitors the CKPT, DIAn, LCKn, LGnn, LGWR, LMDn, LMON, LMSn , and RMSn processes to ensure they are running normally without blocking or spinning. The time for the round trip is measured and collected. This process is automatically started on instance startup. Each of this type of process represents a single class of work item such as AQ notification, queue monitors, and cross process. RVWR writes flashback data from the flashback buffer in the SGA to the flashback logs. The capture process name is CPnn, where nn can include letters and numbers. Database instances, Oracle ASM instances, Oracle IOServer (IOS) instances, 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). FENC receives and processes the fence request from CSSD. If a resource plan is not enabled, then this process is idle. Host processes where database processes execute as threads. I can not get any result and hung up in background . These processes help maintain the global information about XA global transactions throughout the cluster. I/O errors can be emulated on Oracle ASM disk I/O through named events. There can be as many NSVn processes (where n is 0- 9 and A-U) created as there are databases in the Data Guard broker configuration. The IMCO background process initiates population (prepopulation) of in-memory enabled objects with priority LOW/MEDIUM/HIGH/CRITICAL. After it finishes task execution, it automatically picks up another task from the queue. 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. Possible processes are LCK0 and LCK1. This background process listens for new file system requests, both management (like mount, unmount, and export) and I/O requests, and executes them using Oracle threads. Initiates background population and repopulation of in-memory enabled objects. 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. VKRM manages the CPU scheduling for all managed Oracle processes. Query V$PROPAGATION_SENDER for information about a propagation sender. Query V$STREAMS_APPLY_SERVER for information about the apply server background process. FBDA is also responsible for automatically managing the flashback data archive for space, organization (partitioning tablespaces), and retention. This process is automatically started on instance startup. Performs Oracle ASM disk scrubbing repair operation. 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. XDWK gets started when asynchronous actions such as ONLINE, DROP, and ADD an Oracle ASM disk are requested by XDMG. Table F-1 describes Oracle Database background processes. Common background server for basic messaging and RDMA primitives based on IPC (Inter-process communication) methods. NSSn can run as multiple processes, where n is 1-9 or A. LSP0 is also responsible for detecting and enabling run-time parameter changes for the SQL Apply product as a whole. Query V$PROPAGATION_SENDER for information about a propagation sender. The scope can be the process, instance, or even cluster. Manages resources and provides resource control among Oracle RAC instances. Unnn processes are database container operating system processes where database backgrounds processes like SMON, CJQ0, and database foreground processes run. The ACMS process works with a coordinating caller to ensure that an operation is executed on every instance in Oracle RAC despite failures. These slave processes are transient as they are started on demand and they can be shutdown when no longer needed. Symptoms On systems where Exafusion is enabled, the IPC0 background process is seen with a high RSS (resident set size) memory usage in OS commands like "top" and "ps". These processes communicate with the Oracle ASM instance. . SMCO dynamically spawns slave processes (Wnnn) to implement these tasks. MARK essentially tracks which extents require resynchronization for offline disks. On multiprocessor systems, LGWR creates worker processes to improve the performance of writing to the redo log. CKPT checks every three seconds to see whether the amount of memory exceeds the value of the PGA_AGGREGATE_LIMIT initialization parameter, and if so, takes the action described in "PGA_AGGREGATE_LIMIT". Set PO: Workflow Processing Mode profile = Background 2. Clear online redo logs when performing open resetlogs and converting to physical standby. In-memory populate and repopulate tasks running on Wnnn slaves are also initiated from foreground processes in response to queries and DMLs that reference in-memory enabled objects. Performs monitoring management tasks related to Data Guard on behalf of DMON. This process is active only if Exadata Storage is used. An Oracle Database background process is defined as any process that is listed in V$PROCESS and has a non-null value in the PNAME column. This process runs in the database instance and is started when the database instance first begins using the Oracle ASM instance. Writes flashback data to the flashback logs in the fast recovery area. See "THREADED_EXECUTION" for more information about the THREADED_EXECUTION initialization parameter. Multiple MSnn processes can exists, where n is 0-9 or a-Z. See Also: Oracle Database Administrator's Guide. If an apply server encounters an error, then it then tries to resolve the error with a user-specified conflict handler or error handler. RACcrash,hang,shutdownabort.shutdownabort.,CodeAntenna Database instances, XStream Outbound Server, Oracle Streams, Sets resource plans and performs other tasks related to the Database Resource Manager. Database instances, XStream Outbound Server, Sets resource plans and performs other tasks related to the Database Resource Manager. The DLM Statistics Collection and Management slave (SCM0) is responsible for collecting and managing the statistics related to global enqueue service (GES) and global cache service (GCS). The database automatically tunes the number of these processes based on the workload of XA global transactions. CJQ0 is automatically started and stopped as needed by Oracle Scheduler. 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. One process will start for each NUMA node on target machines. Slave processes are numbered from 0 to the PARALLEL_MAX_SERVERS setting. These tasks include preallocating space into locally managed tablespace and SecureFiles segments based on space usage growth analysis, and reclaiming space from dropped segments. DIAG performs diagnostic dumps requested by other processes and dumps triggered by process or instance termination. 4.System Monitor Process. These are the main Oracle background processes, in no particular order, as all of them are equally important: 1.Database Writer Process. After a 5 minute period of inactivity, this process will shut itself down. When you run the page and click the button, the result should look as follows. There can be as many NSVn processes (where n is 0- 9 and A-U) created as there are databases in the Data Guard broker configuration. Wnnn processes are utilized by the IMCO background process for prepopulation of in-memory enabled objects with priority LOW/MEDIUM/HIGH/CRITICAL, and for repopulation of in-memory objects. Captures database changes from the redo log by using the infrastructure of LogMiner. It handles all client interactions and communication, establishes all job contexts, and coordinates all worker process activities on behalf of the job. Parallel Query has two components: a foreground process that acts as query coordinator and a set of parallel slaves (Pnnn) that are background processes. MMON performs many tasks related to manageability, including taking Automatic Workload Repository snapshots and performing Automatic Database Diagnostic Monitor analysis. The local instance has immediate access to the remote snapshot file's data, while repopulation of the recovered primary data files happens concurrently. Assesses latencies associated with communications for each pair of cluster instances. System might be adversely affected. Maintains cluster membership on behalf of the Oracle ASM volume driver. 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. Its primary tasks are to watch for when inaccessible disks and cells become accessible again, and to initiate the ASM ONLINE operation. RVWR also creates flashback logs and performs some tasks for flashback log automatic management. Provides transparent support for XA global transactions in an Oracle RAC environment. Oracle Cloud Infrastructure - Database Service - Version N/A and later Information in this document applies to any platform. FENC receives and processes the fence request from CSSD. They are also helper processes for LMS to handle non-critical work from global cache service. LGWR workers are not used when there is a SYNC standby destination. The primary responsibility of the Database Writer Process is to write data blocks to disk. Job slave processes are created or awakened by the job coordinator when it is time for a job to be executed. System might be adversely affected. Unnn processes are database container operating system processes where database backgrounds processes like SMON, CJQ0, and database foreground processes run. After being released, the connection is returned to the broker for monitoring, leaving the server free to handle other clients. Server processes perform work based on a client request. You can ask the DB which queries are running as that just a table query. This background process coordinates the execution of various space management tasks, including proactive space allocation and space reclamation. Rebalances data extents within an ASM disk group. Each reader server, preparer server, and builder server is a process. The IMCO background process can also initiate repopulation of in-memory objects. Coordinates Oracle ASM disk scrubbing operations. OracleprocessDB SIDOracle instanceOracle instanceSIDADEVDBSIDATESTprocess . Database instances, Oracle ASM instances, Manages incoming remote resource requests from other instances. In previous releases, IMXT segments were dropped by foreground processes. These background processes are spawned or reused during the start of a parallel statement. This relationship is maintained until the master requires services of a particular service process. The SAnn process allocates the rest of SGA in small chunks. The process detects instance transitions and performs reconfiguration of GES and GCS resources. Writes flashback data to the flashback logs in the fast recovery area. There can be up to 32 VI processes, and they are named sequentially from VI00 to VI31. Each of this type of process represents a single class of work item such as AQ notification, queue monitors, and cross process. A minimum of three MSnn processes work as a group to provide transactions to a LogMiner client, for example, a logical standby database or a database capture. Resolves distributed transactions that are pending because of a network or system failure in a distributed database. The slave can repeat this operation in case additional jobs need to be run. Onnn slave processes are spawned on demand. LREG notifies the listeners about instances, services, handlers, and endpoint. 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). The Mnnn processes are a pool of slave processes that can be shared by multiple MZnn processes. On multiprocessor systems, LGWR creates worker processes to improve the performance of writing to the redo log. Coordinates Oracle ASM disk scrubbing operations. GMON must be highly available and cannot wait. Search. This process handles the extraction of redo and coordinates the application of that redo on a physical standby database. Initiates background population and repopulation of in-memory enabled objects. PRnn serves as a slave process for the coordinator process performing parallel media recovery and carries out tasks assigned by the coordinator. The maximum number of Pnnn processes is controlled by the initialization parameter PARALLEL_MAX_SERVERS. 108 - 19 = 89 and not 92. If the database has a multiplexed redo log, then LGWR writes the redo log entries to a group of redo log files. FMON is started by the database whenever the FILE_MAPPING initialization parameter is set to true. 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. FSFP is created when fast-start failover is enabled. These background slave processes perform tasks on behalf of a coordinating process running in another cluster instance. There may be more than one such group, for example, multiple capture processes configured for either local or downstream capture in a database. 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.
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