agent_stack_sz Agent stack size configuration parameter. This parameter determines the memory that is allocated by Db2 for each agent thread stack. aslheapsz Application support layer heap size configuration parameter.The application support layer heap represents a communication buffer between the local application and its associated agent. This buffer is allocated as shared memory by each database manager agent that is started. audit_buf_sz Audit buffer size configuration parameter. This parameter specifies the size of the buffers used when you audit the Db2instance.