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CHAPTER 5 ORACLE PROCESSES
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Lock (LCK0) process: This process is very similar in functionality to the LMD process described earlier, but it handles requests for all global resources other than database block buffers.
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The following are common background processes seen with most single instance or RAC instances: Process Spawner (PSP0) Process: This process is responsible for spawning (starting/creating) the various background processes. It is the process that creates new processes/threads for the Oracle Instance. It does most of its work during instance startup. Virtual Keeper of Time (VKTM ) Process: Implements a consistent, fine-grained clock for the Oracle instance. It is responsible for providing both wall clock time (human readable) as well as an extremely high resolution timer (not necessarily built using wall clock time, more of a ticker that increments for very small units of time) used to measure durations and intervals. Space Management Coordinator (SMCO ) Process: This process is part of the manageability infrastructure. It coordinates the proactive space management features of the database such as the processes that discover space that could be reclaimed and the processes that perform the reclamation.
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Utility Background Processes
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These background processes are totally optional, based on your need for them. They provide facilities not necessary to run the database day to day, unless you are using them yourself, such as the job queues, or are making use of a feature that uses them, such as the new Oracle 10g diagnostic capabilities. These processes will be visible in UNIX as any other background process would be. If you do a ps, you will see them. In my ps listing from the beginning of the focused background processes section (reproduced in part here), you can see that I have Job queues configured. The CJQ0 process is the job queue coordinator. Oracle AQ configured, as evidenced by the Q000 (AQ queue process) and QMNC (AQ monitor process). Automatic memory management enabled, as evidenced by the Memory Manager (MMAN) process. Oracle manageability/diagnostic features enabled, as evidenced by the Manageability Monitor (MMON) and Manageability Monitor Light (MMNL) processes.
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Let s take a look at the various processes you might see depending on the features you are using.
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CJQ0 and Jnnn Processes: Job Queues
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In the first 7.0 release, Oracle provided replication in the form of a database object known as a snapshot. Job queues were the internal mechanism by which these snapshots were refreshed, or made current. A job queue process monitored a job table that told it when it needed to refresh various snapshots in the system. In Oracle 7.1, Oracle Corporation exposed this facility for all to use via a database package called DBMS_JOB. So a process that was solely the domain of the snapshot in 7.0 became the job queue in 7.1 and later versions. Over time, the parameters for controlling the behavior of the job queue (how frequently it should be checked and how many queue processes there should be) changed in name from SNAPSHOT_REFRESH_INTERVAL and SNAPSHOT_REFRESH_PROCESSES to JOB_QUEUE_INTERVAL and
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CHAPTER 5 ORACLE PROCESSES
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JOB_QUEUE_PROCESSES. In current releases only the JOB_QUEUE_PROCESSES parameter is exposed as a usertunable setting. You may have up to 1,000 job queue processes. Their names will be J000 . . . J999. These processes are used heavily in replication as part of the materialized view refresh process. Streams-based replication (new with Oracle9i Release 2) uses AQ for replication and therefore does not use the job queue processes. Developers also frequently use the job queues in order to schedule one-off (background) jobs or recurring jobs such as sending an e-mail in the background or processing a longrunning batch process in the background. By doing some work in the background, you can make a long task seem to take much less time to an impatient end user (he feels like it went faster, even though it might not be done yet). This is similar to what Oracle does with LGWR and DBWn processes; they do much of their work in the background, so you don t have to wait for them to complete all tasks in real time. The Jnnn, where nnn represents a number, processes are very much like a shared server, but with aspects of a dedicated server. They are shared in the sense that they process one job after the other, but they manage memory more like a dedicated server would (their UGA memory is in the PGA, not the SGA). Each job queue process will run exactly one job at a time, one after the other, to completion. That is why we may need multiple processes if we wish to run jobs at the same time. There is no threading or preempting of a job. Once a job is running, it will run to completion (or failure). You will notice that the Jnnn processes come and go over time. That is, if you configure up to 1,000 of them, you will not see 1,000 of them start up with the database. Rather, a sole process, the Job Queue Coordinator (CJQ0) will start up, and as it sees jobs that need to be run in the job queue table, it will start the Jnnn processes. As the Jnnn processes complete their work and discover no new jobs to process, they will start to exit, to go away. So, if you schedule most of your jobs to run at 2:00 AM when no one is around, you might well never actually see these Jnnn processes.
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