About Connection Concentration
Connection concentration provides additional workload balancing opportunities for DB2 Data Sharing by allowing connections to be rebalanced across DB2 Data Sharing members at the commit phase, instead of only at the time of initial connection. This dynamic rebalancing of connections across members can be beneficial after a planned or unplanned outage to DB2.
The default settings for the configuration parameters that control connection concentration are:
Priority of agents (AGENTPRI) is SYSTEM.
Maximum number of existing agents (MAXAGENTS) is 100. MAXAGENTS is the maximum number of worker agents. This value represents the maximum number of concurrent connections to DB2 for z/OS.
Agent pool size (NUM_POOLAGENTS) is 50 (calculated). NUM_POOLAGENTS is the maximum number of idle pool agents. This value represents the number of concurrent connections to DB2 for z/OS. Setting this parameter to 0 disables connection pooling.
Initial number of agents in pool (NUM_INITAGENTS) is 0.
Maximum number of coordinating agents (MAX_COORDAGENTS) is equal to (MAXAGENTS minus NUM_INITAGENTS).
Maximum number of concurrent coordinating agents (MAXCAGENTS) is equal to MAX_COORDAGENTS.
Maximum number of client connections (MAX_CONNECTIONS) is equal to the value of MAX_COORDAGENTS. When MAX_CONNECTIONS is equal to MAX_COORDAGENTS, Connection Concentration is not enabled.