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If the version of a row was created before the MINVALUE or the beginning of the query, you can t capture the value for the starting time stamp or SCN, and your VERSIONS_STARTSCN and VERSIONS_STARTTIME pseudo-columns will be null there won t be any history for this row in your undo segments. The VERSIONS_ENDSCN and VERSIONS_ENDTIME pseudo-columns tell you when the row version expired. If the row version is still current at the time of your Flashback Versions Query, the VERSIONS_ENDSCN and VERSIONS_ENDTIME pseudo-columns will be null. Similarly, if the row version has been deleted from the table, you ll see a null value for these two pseudo-columns.

This parameter affects the sizing of SQL work areas for individual users. The two possible values are auto and manual. If you set this parameter to manual, you also need to set all the parameters for managing the PGA, such as SORT_AREA_SIZE and HASH_AREA_SIZE. If you set this parameter to auto, Oracle will automatically manage the PGA, provided you also set the PGA_AGGREGATE_TARGET parameter. Default value: auto (you must first set the PGA_AGGREGATE_TARGET parameter) Parameter type: Dynamic. You can use the ALTER SYSTEM or ALTER SESSION command to change the value.

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To understand the capabilities and power of the Flashback Versions Query feature, let s look at the simple example shown in Listing 8-1. Listing 8-1. Using the Flashback Versions Query Feature SQL> SELECT versions_xid AS XID, versions_startscn AS START_SCN, versions_endscn AS END_SCN, versions_operation AS OPERATION, empname FROM EMPLOYEES VERSIONS BETWEEN SCN MINVALUE AND MAXVALUE AS OF SCN 7920 WHERE emp_id = 222; XID ---------------0003002F00038BA9 0004002D0002B366 000400170002B366 SQL> START_SCN --------2266 0864 0827 END_SCN -------OPERATION ---------I D I EMPNAME ---------Nick Sam Sam SALARY ------19000 20000 20000

You can gather information about the BFTs in your database by using the following data dictionary views: DBA_TABLESPACES USER_TABLESPACES V$TABLESPACE All three views have the new BIGFILE column, whose value indicates whether a tablespace is of the BFT type (YES) or smallfile type (NO). You can also use the DATABASE_PROPERTIES data dictionary view, as shown in the following query, to find out what the default tablespace type for your database is: SQL> SELECT property_value FROM database_properties WHERE property_name='DEFAULT_TBS_TYPE'; PROPERTY_VALUE -------------SMALLFILE SQL>

The example in Listing 8-1 retrieves three versions of a row for employee number (emp_id) 222. The AS OF SCN of the query is 7920. That is, we want to know what versions of the row existed at this SCN. Although you see three versions in the output, only one of the row versions is true as of the SCN you re interested in. So, which version is it Let s read the query output from top to bottom. Pay particular attention to the START_SCN and the END_SCN columns. All rows will have a START_SCN, but they may have a null value for the END_SCN if the version of the row still exists at the current SCN. The first row, which inserted (operation I) employee name Nick at SCN 2266, is the latest version of the row. Since the END_SCN is null for the first row, you know that this row still existed at SCN 7920. If you look under the OPERATION column, you see the letter D for the second version (START_SCN 0864), indicating that the middle row was deleted (probably accidentally), and the row didn t exist at SCN 7920. The first row thus reflects the fact that the row was reinserted, with a different employee s name. The bottom or third row has an END_SCN number, so clearly this row expired at SCN 0864. This was the originally inserted version of this row, as indicated by the value I (insert) under the OPERATION column.

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