Explain in detail the specific functions of the Oracle database background process

DBWR process: This process writes a buffer into a data file. It is an Oracle background process responsible for Buffer Storage zone management. When a buffer in the buffer zone is modified, it is marked as "dirty". The main task of DBWR is to write the "dirty" buffer to the disk to keep the buffer clean ". The number of unused buffers is reduced because the buffer zone is filled in the database or the user process is dirty. When unused buffers are dropped to a very small level, and user processes cannot find unused buffers when they want to read blocks from the disk to the memory storage area, DBWR manages the buffer areas, allows user processes to get unused buffers.