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Tunneling export import files between servers

February 7, 2004

This useful tip is from Jared Hecker, who wanted to do an export from one server and import to another server without any intermediate flat files!  Quite a cleaver approach.

I came up with a technique to tunnel the export stream between servers.  It was created on Unix, but can be used in the Windows world if you get the M$ version of the utilities installed.  Here we go:


SOURCE = machine we are exporting from
TARGET = machine we are importing to


* SSH set up to connect without passwords (RSA or DSA key pair method)
* If on Solaris, change out 'cat' for GNU version (on Solaris utilities disk)
* Normal Oracle exp and imp issues apply (e.g., catalog issues between db versions).

On TARGET machine

1. mknod /tmp/inpipe.dmp p
2. imp xxx/xxx file=inpipe.dmp &   (bg is optional; I do it to make sure it blocks)

On SOURCE machine

3. mknod /tmp/outpipe p
4. ssh -C user@targethost 'cat > /tmp/inpipe.dmp' < /tmp/outpipe &
5. exp xxx/xxx file=/tmp/outpipe

If you have two xterms up you will be able to see the activity.

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