I have never seen the case where more than 3 or 4 DB writer processes
were needed. That is usually the case with SGA > 128G and 40 or more
cores are available. DBWR is activated at least once per minute, unless
there is a segment checkpoint (usually the case with PQ) or log switch.
How much data do you write in a minute? What kind of SAN do you have?
More DBWR processes means that those processes will each operate on
their own buffer chain and each one will fire a few KB in async IO
requests. You will gain nothing.
On 1/13/21 11:14 AM, Pap wrote:
SGA is ~24GB for this database and total host memory is 500gb+ and its hosting 5 databases.
db_writer_processes is set as "8" for this database.
