The Log Transport Service and Log Apply Service form the backbone of the Data Guard environment. The log transport service starts on the primary database and completes on the standby database. The archiver process (ARCn or ARCH) is responsible for archiving online redo logs. …
What are the mandatory background processes?
This section describes the following mandatory background processes: Process Monitor Process (PMON) System Monitor Process (SMON) Database Writer Process (DBWn)
What is Oracle CJQ0 process?
The Job Queue Coordinator process checks the data dictionary for jobs to be scheduled. When necessary, CJQ0 creates a Job Queue Slave Process (Jnnn) which execute the job.
What is M000 background process in Oracle?
M000 background process generates a trace file at database startup, related to PGA sizing. The trace file contains information related to process memory, similar to the following: Note the allocation of 384MB for qesmmCheckPgaL in the above.
How increase RFS process in Oracle?
Automatic Gap Resolution:
- Shutdown the physical standby database.
- Determine the current sequence on the primary database.
- Perform at least three log switches on the primary database.
- Verify that the logs did not get transferred to the standby archive dest.
- Start the standby database.
What is Fal_server and Fal_client in Data Guard?
Answer: The fal_server and fal_client are init. ora parameters are used for the gap resolution. The fal_client specifies the FAL (fetch archive log) client name that is used by the FAL service, configured through the fal_server initialization parameter, to refer to the FAL client.
What is the purpose of Smon background process?
What is the purpose of SMON (System Monitor Process) background process? Explanation: SMON process of one instance can perform instance recovery for a failed CPU or instance.
What is mandatory background process in Oracle 12c?
Mandatory background processes are DBWn, LGWR, CKPT, SMON, PMON, and RECO. All other processes are optional, will be invoked if that particular feature is activated. Oracle background processes are visible as separate operating system processes in Unix/Linux.
What are the background processes in Oracle?
The background processes in an Oracle instance can include the following:
- Database Writer Process (DBWn)
- Log Writer Process (LGWR)
- Checkpoint Process (CKPT)
- System Monitor Process (SMON)
- Process Monitor Process (PMON)
- Recoverer Process (RECO)
- Job Queue Processes.
- Archiver Processes (ARCn)
What is the purpose of the Ckpt process?
CKPT (Oracle Checkpoint Process) is an Oracle background process that timestamps all datafiles and control files to indicate that a checkpoint has occurred.
What is Smon and Pmon in Oracle?
What is the difference between SMON and PMON processes? SMON (System Monitor) performs recovery after instance failure, monitor temporary segments and extents; clean temp segment, coalesce free space. It is mandatory process of DB and starts by default. PMON (Process Monitor) failed process resources.
What is the use of Ckpt in Oracle?
CKPT (Oracle Checkpoint Process) is an Oracle background process that timestamps all datafiles and control files to indicate that a checkpoint has occurred. The “DBWR checkpoints” statistic (v$sysstat) indicates the number of checkpoint requests completed.
How does cjq0 work in Oracle scheduler?
CJQ0 is automatically started and stopped as needed by Oracle Scheduler. The JOB_QUEUE_PROCESSES initialization parameter specifies the maximum number of processes that can be created for the execution of jobs. CJQ0 starts only as many job queue processes as required by the number of jobs to run and available resources.
What is a background process in Oracle Database?
Table F-1 describes Oracle Database background processes. In this context, a background process is defined as any process that is listed in V$PROCESS and has a non-null value in the pname column. The External Properties column lists the type of instance in which the process runs.
What is a background process in Linux?
In this context, a background process is defined as any process that is listed in V$PROCESS and has a non-null value in the pname column. The External Properties column lists the type of instance in which the process runs. If the process is specific to a particular feature, then the column names the feature.
