Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Buffer,”In the phrase database buffer[…]
Read moreAuthor: mfadmin
DBW or Database Writerback,”The database writer process (DBWn) writes the contents of buffers to datafiles. The DBWn processes are responsible for writing modified (dirty) buffers in the database buffer cache to disk. Although one database writer process (DBW0) is adequate for most systems
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.DBW or Database Writerback,”The database[…]
Read moreCKTP or Checkpoint Processback,”When a checkpoint occurs, Oracle must update the headers of all datafiles to record the details of the checkpoint. This is done by the CKPT process. The CKPT process does not write blocks to disk; DBWn always performs that work.DBWn periodically writes buffers to advance the checkpoint
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.CKTP or Checkpoint Processback,”When a[…]
Read moreLGWR or Redo Log writer or Log writer processback,”The log writer process (LGWR) is responsible for redo log buffer management–writing the redo log buffer to a redo log file on disk. LGWR writes all redo entries that have been copied into the buffer since the last time it wrote.The redo log buffer is a circular buffer. When LGWR writes redo entries from the redo log buffer to a redo log file, server processes can then copy new entries over the entries in the redo log buffer that have been written to disk. LGWR normally writes fast enough to ensure that space is always available in the buffer for new entries
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.LGWR or Redo Log writer[…]
Read moreARC 0..t or Redo Log Archiveback,”Writes filled redo logs to the archive log destination(s). It is known as the archiver, The archiver process (ARCn) copies online redo log files to a designated storage device after a log switch has occurred. ARCn processes are present only when the database is in ARCHIVELOG mode, and automatic archiving is enabled.An Oracle instance can have up to 10 ARCn processes (ARC0 to ARC9). The LGWR process starts a new ARCn process whenever the current number of ARCn processes is insufficient to handle the workload. The alert file keeps a record of when LGWR starts a new ARCn process.If you anticipate a heavy workload for archiving, such as during bulk loading of data, you can specify multiple archiver processes with the initialization parameter LOG_ARCHIVE_MAX_PROCESSES. The ALTER SYSTEM statement can change the value of this parameter dynamically to increase or decrease the number of ARCn processes. However, you do not need to change this parameter from its default value of 1, because the system determines how many ARCn processes are needed
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.ARC 0..t or Redo Log[…]
Read moreRVWR or Recovery Writerback
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.RVWR or Recovery Writerback RVWR[…]
Read moreCJQ0 or Job Queue Process coordinatorback
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.CJQ0 or Job Queue Process[…]
Read moreQMNC or streams AQ Monitor coordinatorback,”QMNC is responsible for facilitating various background activities required by AQ and Oracle Streams: time management of messages, management of nonpersistent queues, cleanup of resources
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.QMNC or streams AQ Monitor[…]
Read moreRECO or Recoverer recovers distributed transactionsback,”RECO uses the information in the pending transaction table to finalize the status of in-doubt transactions. At timed intervals
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.RECO or Recoverer recovers distributed[…]
Read moreDBRM or Database Resource Managerback,”Sets resource plans and performs other tasks related to the Database Resource Manager.If a resource plan is not enabled
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.DBRM or Database Resource Managerback,”Sets[…]
Read more