The number of connections required by the broker to its database depend to some extent on the actions of the message flows it is processing. The following connections are required for each broker:
If you are using the same database for several brokers, you must take account of all brokers in your calculations.
The connections for neighbors and publication nodes are only required if you are using retained publications.
When you start a broker, it opens all connections that it requires to the broker database for its own operation. When you stop the broker, it releases all current database connection handles.
If you are using DB2 for your database, the default action taken by DB2 is to limit the number of concurrent connections to a database to the value of the maxappls configuration parameter. The default for maxappls is 40. If you believe the connections that the broker might require exceed the value for maxappls, increase this and the associated parameter maxagents to new values based on your calculations.
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