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Limitations and Restrictions on Flashback Tables (from metalink)

原创 Linux操作系统 作者:cqubityj 时间:2007-12-25 13:59:52 0 删除 编辑
  • Flashback Table :
Flashback Table happens in place by rolling back only the changes made to the table or tables and their dependent objects, such as indexes. Note that Flashback Table is different from Flashback Drop: Flashback Table undoes recent transactions to an existing table whereas Flashback Drop recovers a dropped table; Flashback Table uses data in the undo tablespace whereas Flashback Drop uses the recycle bin.

The FLASHBACK TABLE command brings one or more tables back to a point in time before any number of logical corruptions have occurred on the tables. To be able to flashback a table, you must enable row movement for the table; because DML operations are used to bring the table back to its former state, the ROWIDs in the table change. As a result, Flashback Table is not a viable option for
applications that depend on the table’s ROWIDs to remain constant.

Before performing the Flashback Table operation, you first enable row movement in the affected tables, as in the following syntax:

SQL> alter table  enable row movement;
Limitations and Restrictions on Flashback Tables :
  • Flashback Table operations are not valid for the following type objects: tables that are part of a cluster, materialized views, Advanced Queuing (AQ) tables, static data dictionary tables, system tables, remote tables, object tables, nested tables, or individual table partitions or subpartitions.
  • The following DDL operations change the structure of a table, so that you cannot subsequently use the TO SCN or TO TIMESTAMP clause to flash the table back to a time preceding the operation: upgrading, moving, or truncating a table; adding a constraint to a table, adding a table to a cluster; modifying or dropping a column; adding, dropping, merging, splitting, coalescing, or truncating a partition or subpartition (with the exception of adding a range partition).

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