Question I am working on exporting
oracle databases having total size of around 40 TB. I need
to export them on external drive to tape media. Is
there any way that I can create a dump file directly on my
external drive mount point? How to I specify a large
dmp file on tape?
Answer.
There are several ways to export to a large file on tape,
using either the exp or the expdp (Data Pump) commands.
Remember, disk is a cheap as was was just a few years ago,
so consider using a disk for exporting very large files,
instead of tape, which is slower and more prone to parity
errors. Once mounted to the OS, a device is a
device, and the exp or expdp commands are standard for
writing to any dmp file, large or small.
A more common example involves mounting the external
tape device to your operating system, creating a named pipe,
and exporting via the named pipe, directly to the tape
device. See here for an example of an
export using a named pipe.
Here is one
example of exporting a file to tape.
Named pipes are indicated by a p as the first letter of
ls -l output. One example of this is the tapedrive pipe
which is created at system startup as an interface to the
init process. NETWORK_LINK - You can initiate an
export job from your server and have Data Pump export data
from a remote database to dump files located on the instance
from which you initiate the Data Pump export job.
$ ls -l /dev/initctl
prw------- 1 root root 0
Jan 9 05:05 /dev/tapedrive
expdp hr/hr DIRECTORY=/dev/tapedrive
NETWORK_LINK=source_database_link
DUMPFILE=network_export.dmp
Here is another example of using Data Pump to
export a large data file directly to a network device.
In the older exp utility to tape, you
use the volsize parameter specify
the maximum number of bytes in an export file on each tape
volume. In the newer expdp utility you use the create
directory command to mount the tape drive to the OS.
Here are the different commands to use when exporting to
tape.
Here is yet another example of using
exp to transfer quickly to a tape drive on a
tape drive on a remote server.
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