Warning: Aq_tm_processes Is Set To 0. System Operation Using Non-sharded Queues Might Be Adversely Affected.
/ 20000 - 20999 Reserved for callers of the/ systemutility.raiseapplicationerror stored procedure.
However, you can use SQL commands to configure data files on shared raw devices. If you are using the IBM General Parallel File System (GPFS), then you can use the same file system for all purposes, including using it for the Oracle home directory and for storing data files and logs.
Master Note:Troubleshooting Oracle Background Processes (Doc ID 1509616.1)In this DocumentApplies to:Oracle Database - Enterprise Edition - Version9.2.0.1 and laterInformation in this document applies to any platform.PurposeThis document is intended to assist Database Administrators resolve issuesencountered involving Oracle Background Processes. It mainly applies to a singleinstance environment and looks at a basic typical database configuration.Troubleshooting StepsConceptsTo maximize performance and accommodate many users, a multiprocess OracleDatabase system uses background processes. Background processes consolidatefunctions that would otherwise be handled by multiple database programs runningfor each user process. Background processes asynchronously perform I/O andmonitor other Oracle Database processes to provide increased parallelism forbetter performance and reliability.Issues Involving Oracle Background ProcessesOracle Database creates background processes automatically when a databaseinstance starts. CKPT: terminating instance due toerror 472 in Linux on System Z- Bug 7385253 - Slow Truncate / DBWRuses high CPU / CKPT blocks on RO enqueueDBW n ( Database Writer Process )The primary responsibility of DBW n is towrite data blocks to disk. DBW n also handlescheckpoints, file open synchronization, and logging of Block Writtenrecords.In many cases the blocks that DBW n writesare scattered throughout the disk.
Thus, the writes tend to be slower than thesequential writes performed by LGWR. DBW nperforms multiblock writes when possible to improve efficiency. The number ofblocks written in a multiblock write varies by operating system.The DBWRITERPROCESSES initialization parameter specifies thenumber of DBW n processes (DBW0-DBW9 andDBWa-DBWz).
The database selects an appropriate default setting for thisparameter or adjusts a user-specified setting based on the number of CPUs andprocessor groups.Issues Specific to DBW n. Shut Down Immediate Ora-00443Background Process Emno Didn't Start- The Event Monitor Process reports anORA-00600 15239 when using OCI AQ Notification- EMN process crash with ORA-07445nserrbd+129- Event Monitor Process: Architecture andKnown IssuesLGWR ( Log Writer Process )Redo log entries are generated in the redo log buffer of the system globalarea (SGA). LGWR writes the redo log entries sequentially into a redo log file.If the database has a multiplexed redo log, then LGWR writes the redo logentries to a group of redo log files.Issues Specific to LGWR.
Nsa Background Process In Oracle
Restarting Dead Queue Monitor Processupgrade from 9.2 to 10.2- Continuous Warning 'Restarting DeadBackground Process Qmn0' in Alert.log- Repeated: Restarting dead backgroundprocess QMNC recorded in the alert.log fileRECO ( Recoverer Process )RECO uses the information in the pending transaction table to finalize thestatus of in-doubt transactions. At timed intervals, the local RECO attempts toconnect to remote databases and automatically complete the commit or rollback ofthe local portion of any pending distributed transactions.
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All transactionsautomatically resolved by RECO are removed from the pending transactiontable.Issues Specific to RECO. SMON Background Process is Running forLong Time- SMON: Failed to acquire SEG2, skippingtransaction- SMON Consumes High CPU With ExcessiveRedo Log Generation- SMON Trace File Reports Messages 'SMON:about to recover undo segment X' 'SMON: mark undo segment X as available'- Bug 7529174 - Deadlock / hang betweenSMON and foreground process- Shutdown Normal or Shutdown ImmediateHangs. SMON disabling TX Recovery- Database Hangs Because SMON Is Taking100% CPU Doing Transaction Recovery- ORA-600 6006 ORA-600 6856 DuringStartup Instance, Followed by Termination by SMONVKTM ( Virtual Keeper of Time Process )VKTM acts as a time publisher for an Oracle instance. VKTM publishes two setsof time: a wall clock time using a seconds interval and a higher resolution time(which is not wall clock time) for interval measurements. The VKTM timer servicecentralizes time tracking and offloads multiple timer calls from otherclients.Issues Specific to VKTM.
Database Startup Fails With ORA-00443:Background Process 'VKTM' Did Not Start- The Database Server Is Creating A Lot OfTrace Files From the VKTM Process- Time Drift Detected. Please Check VktmTrace File For More Details- VKTM Trace Files Generated WithKSTMCHKDRIFT 'BACKWARD DRIFT ENDED AT'W nnn ( Space Management Slave Process)W nnn processes are slave processes dynamically spawned by SMCO toperform space management tasks in the background. These tasks includepreallocating space into locally managed tablespace and SecureFiles segmentsbased on space usage growth analysis, and reclaiming space from droppedsegments.
At most 10 W nnn slaves can run on one database instance.After being started, the slave acts as an autonomous agent. After it finishestask execution, it automatically picks up another task from the queue. Theprocess terminates itself after being idle for a long time.Issues Specific to W nnn.