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That log sequence number will remain unique for that database until the database is opened using the resetlogs operation. Once a resetlogs operation is executed, then the log sequence number is reset to 1. One final note about opening the database using the resetlogs command when performing recovery. If you are using Oracle Database 10g and later Oracle provides the ability to restore the database using a backup taken before the point in time that you issued the resetlogs command, when you issue the resetlogs command, Oracle will archive any remaining unarchived online redo logs, before the online redo logs are reset.

Oracle Logical Structures There are several different logical structures within Oracle. These structures include tables, indexes, views, clusters, user-defined objects, and other objects within the database. Schemas own these objects, and if storage is required for the objects, that storage is allocated from a tablespace. It is the ultimate goal of an Oracle backup and recovery strategy to be able to recover these logical structures to a given point in time. Also, it is important to recover the data in these different objects in such a way that the state of the data is consistent to a given point in time.

More coverage on the implications of ARCHIVELOG mode, how to implement it (and disable it), and configuration for ARCHIVELOG operations can be found in Chapter 3. Oracle Logical Structures There are several different logical structures within Oracle. These structures include tables, indexes, views, clusters, user-defined objects, and other objects within the database. Schemas own these objects, and if storage is required for the objects, that storage is allocated from a tablespace. It is the ultimate goal of an Oracle backup and recovery strategy to be able to recover these logical structures to a given point in time.

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