There is no hard limit on the number of members in a DQ group. DQ members communicate through internal protocol messages. DQ protocol messages itself impose some processing overhead. Therefore, up to a certain point, adding an extra DQ member will not increase performance.
We have no recommendation on the optimal number of DQ members. We suggest customers perform tests to find out the limit based on their own environment (hardware capabilities, business requirement, application style, message size and rate, etc.).
In general, many of our customers using 4-5 members in a DQ group do so without issue.
Issue/Introduction
Is there a recommended maximum number of Distributed Queue workers/listeners?