![]() ![]() The background processes in an Oracle instance can include the following:Īns : Oracle creates server processes to serve user processes requests, connected to the instance. The DBW(n) process is responsible for writing modified buffers in the database buffer cache to disk.Ĩ.What are the background processes in an oracle instance? Log Writer writes all redo entries in the buffer to the disk since the last time it wrote.Īns: It writes the contents of buffers to data files. With Application Clusters, the System Monitor process of one instance can perform instance recovery for a failed CPU or instance.Īns: It is responsible for writing the redo log buffer to a redo log file on disk.If any terminated transactions were skipped during instance recovery due to file-read or offline errors, System Monitor Process recovers them when the tablespace or file is brought back online.It performs recovery, if necessary, at instance startup.Process Monitor also registers information about the instance and dispatcher processes with the network listener. Process Monitor is responsible for cleaning up the database buffer cache and reclaiming resources that the user process was using. The RECO process of a node automatically connects to other databases involved in an in- doubt distributed transaction.Īns:It performs process recovery when a user process fails. ![]() The LGWR process starts a new ARCn process whenever the current number of Archiver processes is insufficient to handle the workloadĪns: The re-coverer process (RECO) is a background process used with the distributed database configuration that automatically resolves failures. ![]() The database has to be in ARCHIVELOG mode, and automatic archiving should be enabled.Īn Oracle instance can have up to 10 Archiver processes (ARC0 to ARC9). Shared server architecture removes the need for a dedicated server process for each connection.Ī dispatcher routes multiple incoming network session requests to a pool of shared server processes.Īn idle shared server process from a pool of shared server processes picks up a request from a common queue, which does mean a small number of shared servers can do the same amount of processing as many dedicated servers.Īns: It copies redo log files to a designated storage device after a log switch has occurred. The server process created on behalf of each user process is called a dedicated server process (or shadow process). Oracle DBA interview Questionsġ.What are dedicated and shared server process? You to judge your readiness for the Oracle DBA Interview. Test your knowledge with Advanced Oracle DBA Interview Questions 2018 that helps Oracle is one of the market leader in “Databases” segment.Ĭheck out below article on Oracle DBA Interview Questions for Experienced or Freshers. Are you planning to give interview for “Oracle DBA”? ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |