Background process sorting, background process restrictions

Background process sorting, background process restrictions

The instance background process starts when the instance is started and stops running when the instance is terminated.

1. SMON

The initial task is to install and open the database. SMON installs the database by searching and verifying the Database Control File. Then, open the database by searching and verifying all data files and On-line log files. Once the database is opened and used, SMON performs various internal management tasks, such as merging the available space in the data file.

2. PMON

PMON monitors all server processes and detects any resources in the session. If the session ends abnormally, PMON will destroy the server process, return its PGA memory to the idle memory pool of the operating system, and roll back any ongoing unfinished transactions.

3. DBWn

The session writes data to the buffer in the database buffer cache, and DBWn writes the data in the database buffer cache to the disk.

Note: What actions does DBWn take when a transaction is committed? Do nothing!

4. LGWR & ARCn

LGWR writes the content in the log buffer to the online log file on the disk, and ARCn writes the content in the online log file to the archived log file.

5. CKPT

Sends signals from common checkpoints to stimulate DBWn. From 8i, DBWn replaces the full checkpoint with the incremental checkpoint.

Note: When will a full checkpoint occur? This should only be required, or appears when the database is closed in an orderly manner.

How to organize background programs of win7

Background programs are programs that are not directly accessible to users. The background program can be any program or even a device that completes the corresponding functions. Therefore, it is not defined to prevent the existence of special sessions such as MSGBOX. It is only because it is running in the background and cannot be reached by the front-end users, so sessions such as MSGBOX, it makes no sense. MSGBOX and others may even block the normal operation of the program, so it will not be able to achieve the background effect. Although it is caused by an error, it is suspended for processing, but the front-end users cannot know, and cannot interact with it, which violates the rules of the background Job Program. During this period, the front-end user does not see any exception prompts, or even considers the operation to be normal, then, the system waits until the background administrator processes the exception. Such a wait consumes a lot of unnecessary time. Web programs include front-end programs and back-end programs. Most websites must have backend programs to facilitate management and modification by website administrators.
So I personally think that I cannot sort it out.

Too many background computer processes

There are several suggestions for your reference: 1. Use tools such as 360 and master optimization to optimize the system startup items. Do not start processes that are not commonly used. If not, select "one-click optimization ". 2. Use the above tool to delete junk files .. And clear the disk. 3. Refresh the C drive and delete unnecessary programs. At the same time, install the application on other disks except the system disk .. 4. Expand the memory and change the capacity of the virtual memory. We recommend that you set it to 1.5-2 times the physical memory... Hope to help you...