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Oracle export tape tips

Oracle Database Tips by Donald BurlesonJanuary 5, 2013

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

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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