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Forcing Oracle to use LOGGING mode

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I've just read an interesting newsletter about that how we can force the database (or some tablespace) to use the LOGGING mode for all operations. For example, lets imagine that we don't want someone improperly to start some operation in NOLOGGING mode that will lead the database to impossibility of performing of full database recovery after media failure. This could be important issue if a Standby database is used as well.
The FORCE LOGGING clause was introduced in Oracle9i R2. It tells to Oracle redo logs to be written even when the NOLOGGING was specified in a DDL staement, table in NOLOGGING mode was created, or SQL*Loader was used to fill table via direct path loading.
This command can be applied at the database or tablespace level:


The following query shows the recovery time of the last used NOLOGGING operation for all datafiles:

SELECT name,unrecoverable_change#,unrecoverable_time FROM v$datafile;

Keep in mind that Oracle never generates redo records for temporary tablespaces and temporary segments, so forced logging has no affect for these.
For more details about this feature:
Oracle9i Documentation - Specifying FORCE LOGGING Mode
Metalink note:174951.1 - Force Logging

Another very interesting Metalink note about the problems coming from using of NOLOGGING operations especially when Standby database exists:
Metalink note:290161.1 - The Gains and Pains of Nologging Operations

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About me

  • » I'm Radoslav Rusinov
  • » From Sofia, Bulgaria
  • » Employer TechnoLogica Ltd.
  • » I am working as a Database Consultant in Sofia, Bulgaria. My main professional interests are in the database area and especially in the Oracle RDBMS, including database design, development, security and administration.
  • » The views expressed on this blog are my own and do not necessarily reflect the views of my employing company and its affiliates
  • » My profile

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