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Logically defining data access as a separate layer enforces a separation between the business logic and any interaction with a database (or any other data source). This separation provides the flexibility to choose later whether to run the data access code on the same machine as the business logic or on a separate machine. It also makes it much easier to change data sources without affecting the application. This is important because it enables switching from one database vendor to another at some point. This separation is useful for another reason: Microsoft has a habit of changing data access technologies every three years or so, meaning that it is necessary to rewrite the data access code to keep up (remember DAO, RDO, ADO 1.0, ADO 2.0, ADO.NET, and now LINQ and the ADO.NET Entity Framework ). By isolating the data access code into a specific layer, the impact of these changes is limited to a smaller part of the application. Data access mechanisms are typically implemented as a set of services; each service is a procedure that the business logic calls to retrieve, insert, update, or delete data. Although these services are often constructed using objects, it s important to recognize that the designs for an effective Data Access layer are really quite procedural in nature. Attempts to force more object-oriented designs for relational database access often result in increased complexity or decreased performance. I think the best approach is to implement the data access as a set of methods but encapsulate those methods within objects to keep them organized logically.

account SCOTT execute privileges on the DBMS_LOCK package to accomplish this: sys%ORA11GR2> grant execute

on dbms_lock to scott;

Note If you re using an object database instead of a relational database, then of course the data access code may be very object-oriented. Few of us get such an opportunity, however, because almost all data is stored in relational databases.

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The science of physics that concerns itself with the study of matter/energy interactions is governed by numerous laws and theories, most of which pertain to objects that are in motion The concept of motion, in turn, is irrevocably linked to that of time Sam knew he was entering a slippery slope Objects, motion, time To most of the earthlings these concepts appear as very concrete, constant, and obvious But their scientists have been learning otherwise The body of knowledge that constitutes physics has been punctuated in the course of its expansion by numerous conflicts, contradictions, and inconsistencies, in an effort to bring forth a clearer and more refined understanding of these fundamental concepts Numerous laws and theories that have been advanced over the centuries of earthly time flashed before Sam s awareness They were all there, both silly and profound.

Notice that the first time I queried, I was using S000 as the shared server Then, in another session, I executed a long-running statement that monopolized the shared server, which just happened to be S000 this time The first non-busy shared server is the one that gets assigned to do the work, and in this case no one else was asking to use the S000 shared server, so the DBMS_LOCK command took it When I queried again in the first SQL*Plus session, I got assigned to another shared server process, S001, since the S000 shared server was busy It is interesting to note that the parse of a query (returns no rows yet) could be processed by shared server S000, the fetch of the first row by S001, the fetch of the second row by S002, and the closing of the cursor by S003.

That is, an individual statement might be processed bit by bit by many shared servers So, what we have seen in this section is that a connection a physical pathway from a client to a database instance may have zero, one, or more sessions established on it We have seen one use case of that when using SQL*Plus s AUTOTRACE facility Many other tools employ this ability as well For example, Oracle Forms uses multiple sessions on a single connection to implement its debugging facilities The n-tier proxy authentication feature of Oracle, used to provide end-to-end identification of users from the browser to the database, makes heavy use of the concept of a single connection with multiple sessions, but each session would use a potentially different user account We have seen that sessions can use many processes over time, especially in a shared server environment.

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