Question: I see that there is a new
disable_archive_logging parameter for Data
One nice Oracle12c feature is the ability to run in nologging mode, disabling archive logging during a large import. In this example we suppress the use of redo logs during the import:
impdp scott/tiger parfile=mypar.par transform=disable_archive_logging:y
In this example, we only suppress the redo generation for indexes during the import. In this case, an abort would require manual rebuilding of the indexes.
impdp scott/tiger parfile=mypar.par transform=disable_archive_logging:y:index
Note: When running with transform=disable_archive_logging, an abort will not roll-back and you will need to restore the table. Hence, always take a backup of the target table before using the transform=disable_archive_logging option.
Oracle experts have noted that using the disable_archive_logging option results in a measurable improvement in import load times, making this an important performance tip.
Also note that disable_archive_logging will have no effect if the database is running in force logging mode.
disable_archive_logging in Data Pump
to simply disable the writing on archived redo logs, and
thereby speeding-up export operations. You can set
disable_archive_logging at several levels, globally and for
specific tables and indexes:
Here is a
sample invocation of Data Pump, a schema import that
disables arching logging:
impdp dumpfile=pythian.dmp table_exists_action=append
In most cases you would want to run the disable
archive logging parameter at the schemas level.
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