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Figure 3-38. The timing of depth-first delivery Depth-first delivery order is common in single-threaded systems where notification delivery is based on procedure calls, because procedure calls block naturally without requiring any extra work on the part of the system. When dealing with multicast notifications, depth-first order can produce an ordering that isn t causal. This can happen both in single-threaded and multithreaded systems. For example, consider the diagram in Figure 3-39, in which an event e1 triggers notifications n1.1 and n1.2 that are sent to B and C, respectively.

In cell A1, above your pivot table s Report Filter, you entered heading text for the worksheet. In the PivotTable Field List, you dragged another field to the Report Filters area, below the existing Report Filter. When you release the mouse button, you get a warning about replacing the contents of the destination cells (see Figure 6-1). If you click OK, the Report Filters move up and remove the heading in cell A1. You d prefer the Report Filters move down when they re added, so they don t delete the worksheet heading you created. This problem is based on the RptFilters.xlsx sample workbook.

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Time and again, I have seen that developers don t take enough time to gain knowledge about the features offered by Oracle. This proves very costly as we reinvent the wheel by rewriting what has already been written by Oracle for us. In the past, I myself have been guilty of this. For example, in one of the systems I worked on, I needed to maintain a history of changes to records in a set of tables. It took my team about a man-month to write procedural code for this purpose before we realized that there is a feature called Workspace Management in Oracle that will do this for us already (see Oracle Application Developer's Guide Workspace Manager [10g Release 1] for more details). I was able to write pretty much the same code in half a day using the Workspace Management feature! Had I known about this feature earlier, I could have potentially saved the team at least that one man-month s worth of effort (assuming that the restrictions that this feature imposed were acceptable to our system).

Figure 3-39. A depth-first system using multicast notifications Figure 3-40 shows the timing sequence.

I have seen people routinely coding for features that are part of the Oracle database offering. Some common examples are Coding referential integrity in the application instead of using database features such as foreign keys Not using materialized views when applicable Creating query joins in the application layer (a very bad idea indeed) People recode features already available in Oracle for one or more of the following reasons: Unawareness of these features: This can be avoided by actively learning about Oracle. See Appendix B for a list of resources I recommend strongly. You can also learn a lot by attending conferences, joining Oracle user groups in your area, and reading the articles at http://otn.oracle.com. Fear of new features: Some people are wary of a new feature from a release-stability point of view. However, it s still worth reading up on and learning about new features and using them actively; otherwise, you ll continue to write the same code. (And don t forget that you may also introduce your own bugs.) In general, if you re about to write an application feature that seems like something that might already be present in Oracle, do some research on what Oracle offers before you jump in and start coding. Attitude problem (i.e., the mistaken belief that you could do a better job than Oracle): My philosophy is to trust the database to do its job well. If you reinvent code already written by Oracle, you ll inevitably spend lots of effort in writing code that performs terribly, is incorrect, and is hard to maintain. The time and effort you spend in learning a new Oracle feature will pay off many times over later on.

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