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First, note the time Then delete some rows from a table, and commit the change A query confirms that there are only two rows in the table, and no rows where the REGION_NAME begins with A The next query is directed against the table as it was at the earlier time: back then there were four rows, including those for Asia and Americas Make no mistake about this the two rows beginning with A are gone; they were deleted, and the delete was committed It cannot be rolled back The deleted rows you are seeing have been constructed from undo data The final query combines real-time data with historical data, to see what rows have been removed The output of this query could be used for repair purposes, to insert the rows back into the table While being able to direct one query against data as of an earlier point in time may be useful, there will be times when you want to make a series of selects It is possible to take your whole session back in time by using the DBMS_FLASHBACK package:

Layer Styles and Associated Options when Added to Type Layers (continued)

SQL> execute dbms_flashbackenable_at_time(> to_timestamp('27-12-08 16:54:06','dd-mm-yy hh24:mi:ss')); PL/SQL procedure successfully completed SQL>

From this point on, all queries will see the database as it was at the time specified All other sessions will see real-time data but this one session will see a frozen version of the database, until the flashback is canceled:

If you customize a layer style, you can save it to use for other layers To do so, click the New Style button in the Layer Style dialog box Then, specify whether to include both the Layer Effects and Blending Options in the style, and give your style a name Saved styles are stored in the Styles palette (Window | Styles) For more tips on using the preset styles found in that palette, see 9

While in flashback mode, it is impossible to execute DML commands They will throw an error Only SELECT statements are possible How far back you can take a flashback query (either one query, or by using DBMS_FLASHBACK) is dependent on the contents of the undo segments If the undo data needed to construct the out-of-date result set is not available, then the query will fail with an ORA-08180, No snapshot found based on specified time, error The syntax for enabling flashback query will accept either a timestamp or an SCN If you use an SCN, then the point to which the flashback goes is precise If you specify a time, it will be mapped onto an SCN with a precision of three seconds EXAM TIP You can query the database as of an earlier point in time, but you can never execute DML against the older versions of the data

Conceptually, a table flashback is simple Oracle will query the undo segments to extract details of all rows that have been changed, and then construct and execute statements that will reverse the changes The flashback operation is a separate transaction, which will counteract the effect of all the previous transactions if possible The database remains online and normal work is not affected, unless row locking is an issue This is not a rollback of committed work, it is a new transaction designed to reverse the effects of committed work All indexes are maintained, and constraints enforced: a table flashback is just another transaction, and the usual rules apply The only exception to normal processing is that by default triggers on the table are disabled for the flashback operation A table flashback will often involve a table that is in a foreign key relationship In that case, it is almost inevitable that the flashback operation will fail with a constraint violation To avoid this problem, the syntax permits flashback of multiple tables with one command, which will be executed as a single transaction with the constraint checked at the end The first step to enabling table flashback is to enable row movement on the tables This is a flag set in the data dictionary that informs Oracle that row IDs may change A row ID can never actually change but a flashback operation may make it appear as though it has For instance, in the case of a row that is deleted, the flashback operation will insert it back into the table: it will have the same primary key value, but a different row ID

In the example that follows, there are two tables: EMP and DEPT There is a foreign key relationship between them, stating that every employee in EMP must be a member of a department in DEPT First, insert a new department and an employee in that department, and note the time: