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Oracle Unrecoverable Table Option

Oracle Tips by Burleson Consulting
Using Oracle’s UNRECOVERABLE Option

Please note that the UNRECOVERABLE option has been deprecated and replaced with the NOLOGGING option.

* Create index . . . unrecoverable--This is the most common use of the unrecoverable clause, and certainly the one that makes the most sense from an Oracle perspective. Regardless of any transaction failures, an index can always be re-created by dropping and redefining the index, so having an incomplete or corrupt index would never be a problem.

* Alter table . . . add constraint . . . unrecoverable--As we know, when a referential integrity constraint is added to a table, the Oracle software will sometimes create an index to enforce the constraint. Primary key, foreign key, and unique constraints may cause Oracle to create an index, which is built in unrecoverable mode.

* SQL*Loader--SQL*Loader is generally used when initially populating Oracle tables from external flat files. For very large numbers of inserts, it is best to leave the default. We already know that in the unlikely event of an abnormal termination, the incomplete tables must be dropped and SQL*Loader run again.

This is an excerpt from "High Performance Data Warehousing", copyright 1997. To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:




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