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- Newsgroups: comp.databases.oracle
- Path: sparky!uunet!munnari.oz.au!newsroom.utas.edu.au!ml.csiro.au!solaris!jstander
- From: jstander@ml.csiro.au (Jeff Stander)
- Subject: Re: Export/Import to tape?
- Message-ID: <1993Jan24.223932.4206@ml.csiro.au>
- Sender: news@ml.csiro.au
- Reply-To: jstander@ml.csiro.au
- Organization: CSIRO Marine Laboratories
- References: <1993Jan22.200037.1902@spectrum.xerox.com>
- Date: Sun, 24 Jan 1993 22:39:32 GMT
- Lines: 39
-
- In article 1902@spectrum.xerox.com, rdutc@sarek.xerox (Ray Dutcher) writes:
- > Compressing the export through a named pipe worked great and I did the
- > reverse fine without any loss of data. I also did this with success on
- > data files (ie. a physical backup). Thanks for the info. Just to
- > check I called Oracle Support to see if they were familiar with this
- > technique and they said that they know of customers who do this but
- > they know that some customers have experienced a loss of data when
- > using the UNIX compress/uncompress command and that Oracle will not
- > support this technique. I also used compress in the past on exports to
- > transfer a database to another machine over my network and also had
- > zero problems.>
-
- > Before I put this technique into a production system I would like to
- > know if anyone has experienced the "data loss" that Oracle Support
- > mentioned? and if so please state your Oracle version and OS when
- > replying.
-
- > FYI, here's the technique I'm referring to:
- > (1) Compressing export to disk
- > mknod ora_export.dmp p
- > nohup compress < ora_export.dmp > ora_export.dmp.Z &
- > exp / ...... file=ora_export.dmp
- >
- > This lets you compress on the fly without using any disk (well,
- > you will use 4 disk blocks or the size of a pipe).
-
- I have used this technique for years and have not experienced any
- data losses with UNIX compress.
-
- ---
- ___________________________________________________________________________
-
- Jeff.Stander@ml.csiro.au _--_|\ Database Analyst
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