... Practices Module 9 is the second of two modules that focus on the data access layer (DAL). In Module 8, The Nontransactional Data Access Layer, ” you learned about data retrieval. In this module, ... addition to the preceding attributes, the topics covered in the previous module, Module 8, The Nontransactional Data Access Layer, ” apply. In particular, the information about object pooling, the ... methods to the Transactional DAL. 5. Save the design. Module 9: The Transactional Data Access Layer 11 The second step is the CRM Worker’s use of another component provided by COM+: the...