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Figure 7-1. The symbol for an object Every object must have a name and can also include an optional ID. The name is the name of the object as used in the source code. If the object is used as a singleton, the object s class name can be used. Whether the name is uppercase or lowercase depends on the conventions of the programming environment or component platform. You may include namespaces, if necessary, to distinguish between similarly named objects in different namespaces. When it is important to specify the class of an object, the name can be followed by a colon and the class name e.g., myName: MyClass. The ID is a numbered label of the form Cn, where C is an uppercase string and n is a decimal number, starting at 1. The string portion of the label designates the object s role in the system. I ll discuss roles later, in 10. Table 7-1 shows the role-based labels used in the diagrams of this book.

The Flashback Versions Query feature enables you to retrieve all committed versions of a table s data between two time points. If you ve updated a table row ten different times, for example, the Flashback Versions Query will get you all ten versions of that row over time. The complete syntax for the Flashback Versions Query is as follows: SQL> SELECT [pseudocolumns] . . . /* provide details about the row history */ FROM . . . /* table name goes here */ VERSIONS BETWEEN {SCN|TIMESTAMP {expr|MINVALUE} AND {expr|MAXVALUE}} [AS OF{SCN|TIMESTAMP expr}] WHERE [pseudocolumns . . . ] . . . Using the versions clause in a query will get you multiple versions of the rows returned by the query. In the preceding syntax statement, you can use the VERSIONS clause as a part of your normal SELECT statement, with a BETWEEN clause appended to it. You can also specify an SCN or a TIMESTAMP clause. You must specify the start and end expressions by using MINVALUE and MAXVALUE, which indicate the start time and end time of the interval for which you are seeking the different row versions. The MINVALUE and the MAXVALUE are resolved to the time stamp or the SCN of the oldest and the most recent data that s available in the database, respectively.

You must ensure that the beginning and ending interval, framed by either SCNs or time stamps, don t go back beyond the time specified by the UNDO_RETENTION parameter. While you can actually specify a begin or an end time point that lies outside the interval spanned by the UNDO_RETENTION parameter, the query may not work.

Figure 7-2. An example of two objects, with name and ID IDs can be omitted on simple one-page diagrams, but in complex diagrams, IDs become very useful for cross-referencing objects that are on different pages.

Note that the AS OF clause is optional, and when you use it, the database will retrieve all the rows as of that particular SCN or time stamp. If the VERSIONS clause is used by itself, as in VERSIONS BETWEEN SCN MINVALUE and MAXVALUE, without using the optional AS OF clause, the data is retrieved as of the current session. If you add the AS OF clause, as shown next, the data is retrieved as of a specified SCN or clock time: VERSIONS BETWEEN SCN MINVALUE and MAXVALUE AS OF SCN 56789

The output of a Flashback Versions Query is unlike the output of your typical SELECT statement. The output can show multiple versions of the same row, with a row representing each time the particular row was inserted, updated, or deleted. In addition to the column values you specify in the SELECT statement, Oracle will provide you with values for a set of pseudo-columns for each row version. These pseudo-columns provide metadata about the various row versions, including the type of