What is Ckpt process 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.
What are the Oracle background processes?
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 Oracle checkpoint process?
Answer: The checkpoint process is responsible for updating file headers in the database datafiles. A checkpoint occurs when Oracle moves new or updated blocks (called dirty blocks) from the RAM buffer cache to the database datafiles.
What is Oracle process Architecture?
Processes are divided into the following types: A client process runs the application or Oracle tool code. An Oracle process is a unit of execution that runs the Oracle database code. In the multithreaded architecture, an Oracle process can be an operating system process or a thread within an operating system process.
What is the difference between Pmon and Smon?
PMON is the Process Monitor which is responsible for recovering processes when the user process fails. PMON does the process cleanup. SMON is the System Monitor which is responsible for recovering the system after a failure.
How many Oracle processes are running?
Oracle has at least 8 processes running which run the db. Like RMON etc.
What is the difference between Smon and Pmon processes?
What is checkpoint queue Oracle?
Checkpoint queue is the link list in the buffer cache which contains the information of the dirty buffers and is constantly getting flushed. Its flushing doesn’t change the checkpoint change numbers of the data file.
How does Oracle server process work?
Oracle Database creates server processes to handle the requests of user processes connected to an instance. A server process can be either of the following: A dedicated server process, which services only one user process. A shared server process, which can service multiple user processes.
What is MMON in Oracle?
From Oracle FAQ. MMON (Manageability Monitor) is a background process that gathers memory statistics (snapshots) and stores this information in the AWR (automatic workload repository). MMON is also responsible for issuing alerts for metrics that exceed their thresholds. This process was introduced in Oracle 10g.
What is the use of cckpt process?
CKPT (Checkpoint Process): When this process is triggered, the Database Writer (DBW) process writes dirty blocks in the database buffer cache to datafiles. It also updates the Datafiles header ( latest checkpoint SCN ) and controlfiles with checkpoint information.
How does CKPT record checkpoints?
At specific times CKPT starts a checkpoint request by messaging DBW n to begin writing dirty buffers. On completion of individual checkpoint requests, CKPT updates data file headers and control files to record most recent checkpoint. The capture process name is CP nn, where nn can include letters and numbers.
What is combined capture and apply optimization in Oracle Streams?
In an Oracle Streams combined capture and apply optimization, the propagation sender sends LCRs directly to the propagation receiver to improve performance. The propagation receiver passes the LCRs to an apply process.
What is the use of vktm in Oracle?
VKTM acts as a time publisher for an Oracle instance. VKTM publishes two sets of time: a wall clock time using a seconds interval and a higher resolution time (which is not wall clock time) for interval measurements.