Integration Server includes a connection management service that dynamically manages connections and connection pools based on configuration settings that you specify for the connection. By default, connection pooling is enabled for all adapter connections.

A connection pool is a collection of connections with the same set of attributes. Integration Server maintains connection pools in memory. Connection pools improve performance by enabling adapter services to reuse open connections instead of opening new connections. Depending on the type of edition subscribed by the organization, Salesforce.com limits the number of API requests or calls that any one organization may execute concurrently, or within any 24 hour period. Ensure that you set the Minimum Pool Size and Maximum Pool Size parameters of adapter connection appropriately. For information about these parameters, see Configuring Adapter Connections. For more information on API usage metering, see the Force.com Web Services API Developer's Guide.