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First, you need to make sure the user performing the Flashback Table operation has all privileges, which could be either FLASHBACK ANY TABLE or the more specific FLASHBACK object privilege on the table to be flashed back. The user must also have SELECT, INSERT, DELETE, and ALTER privileges on the table. The flashback operation doesn t preserve Oracle ROWIDs when it restores rows in the changed data blocks of the table, since it uses DML operations to perform its work. These DML operations change the row IDs of the affected rows, so you must ensure that you have enabled row movement in the tables you are using for the Flashback Table feature, as shown here: SQL> ALTER TABLE emp ENABLE ROW MOVEMENT; Table altered. SQL> Once you enable row movement in the table, you are ready to flash back the table to any time or any SCN in the past, providing you have the necessary undo information in your undo tablespace. Before you use the Flashback Table feature, note its complete syntax: SQL> FLASHBACK TABLE [schema.]table [,[schema.]table] . . . TO {{SCN|TIMESTAMP} expr [{ENABLE|DISABLE}TRIGGERS ] |BEFORE DROP[RENAME TO table] }; In this chapter, you ll only see the FLASHBACK TABLE . . . TO SCN|TIMESTAMP part of the FLASHBACK TABLE statement. The last line, BEFORE DROP refers to the FLASHBACK DROP feature, which, is discussed in 16 in the discussion of database recovery techniques. Here s an example that shows how to flashback a table to a past SCN: SQL> FLASHBACK TABLE emp TO SCN 5759290864; Flashback complete. SQL>

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When a Flashback Table operation completes, all indexes that belong to the tables in the Flashback Table Tip list will have their indexes reverted to the time to which the tables are flashed back. However, the optimizer statistics will still reflect the current data in the table.

You can also specify a time to flash back to, using a time stamp instead of an SCN, as shown here: SQL> FLASHBACK TABLE persons TO TIMESTAMP TO_TIMESTAMP ('2005-04-05 10:00:00', 'YYYY-MM-DD HH24:MI:SS'); The preceding FLASHBACK TABLE command restores the persons table to 10:00 AM on April 5, 2005.

cat $REPORT | mail -s "$ENVIRONMENT password aging report" $ADMIN_EMAIL mv $REPORT $ARCHIVE/report.$backdate

You can use the following statement to flash back a table by one day: SQL> FLASHBACK TABLE persons to TIMESTAMP (SYDATE -1); You can flash back more than one table at a time, as shown in the following example (but first make sure you enable row movement for both tables): SQL> FLASHBACK TABLE persons,person_orgs TO TIMESTAMP (SYSDATE -1) The Flashback Table operation is an in-place, online operation and thus doesn t involve taking data files or tablespaces offline, unlike traditional point-in-time recovery.

Even though the C++/CLI compiler silently maps all usages of native types in your source code to functioning IL code, it makes sense to have a closer look at the internals Let s begin with a simple function: int f(double d); Since all numeric primitives like int and double have counterparts with the same binary layout in the managed type system, the C++/CLI compiler simply considers equivalent managed and native primitives as one type To the C++/CLI compiler, the following declaration is equivalent to the preceding one: System::Int32 f(System::Double d); However, the Visual C++ compiler supports two 32-bit signed integer types: int and long As a C++ programmer, you can write the following two overloads of the function f: void f(int i) { /* .. */ } void f(long l) { /* .. */ } Both int and long should be mapped to System::Int32.

Oracle disables all relevant triggers by default and re-enables them upon completing the table recovery, though you can override this by appending the ENABLE TRIGGERS clause to your FLASHBACK TABLE statement, as shown here: SQL> FLASHBACK TABLE persons to TIMESTAMP TO_TIMESTAMP ('2005-04-05 10:00:00', 'YYYY-MM-DD HH24:MI:SS') ENABLE TRIGGERS; If you don t have sufficient undo data to flash back the table, you ll get the error shown in Listing 6-6, which means that part of the undo information was overwritten Unfortunately, the Flashback Table feature can t help you here, as it relies entirely on the presence of adequate undo information The only solution is to use a larger undo tablespace or enable the guaranteed undo retention feature as explained in the The UNDO_RETENTION Parameter section, earlier in this chapter Listing 6-6.

Failure of a Flashback Table Operation SQL> FLASHBACK TABLE emp,dept to TIMESTAMP (SYSDATE -1); flashback table emp, dept to TIMESTAMP (SYSDATE -1) * ERROR at line 1: ORA-00604: error occurred at recursive SQL level 1 ORA-12801: error signaled in parallel query server P005 ORA-01555: snapshot too old: rollback segment number 108 with name "_SYSSMU108$" too small 01555, 00000, "snapshot too old: rollback segment number %s with name \"%s\" too small" // *Cause: rollback records needed by a reader for consistent read are // overwritten by other writers // *Action: If in Automatic Undo Management mode, increase undo_retention // setting..