Re: How to transfer databases form one server to other

On 1/26/20 7:30 PM, Adrian Klaver wrote:
> On 1/26/20 2:47 PM, Andrus wrote:
>> Hi!
>>
>>> Before you do any of this I would check the Release Notes for the first
>>> release of each major release. Prior to version 10 that would be X.X.x
>>> where X is a major release. For 10+ that is X.x.  I would also test the
>>> upgrade before doing it on your production setup.
>>
>> I want to create test transfer first, check applications work and after
>> that final transfer.
>>
>>> Best practice if you are going the dump/restore route is to use the
>>> pg_dump binary from the new server(12) to dump the old server(9.1)
>>
>> Postgres version 12 pg_dump probably cannot installed in old server
>> (Debian Squeeze 9).
>> Running pg_dump in new server probably takes much more time since data is
>> read from uncompressed form and dumping is time-consuming process.
>> (internet connection between those server is fast, SSH copy speed was 800
>> Mbit (not 100 Mbit as I wrote), it took 5 minutes to copy 37 GB).
>
> Test it and see how slow/fast it is.

I ran *uncompressed* pg_dump on multiple TB+ sized databases from v8.4
servers across the LAN using 9.6 binaries on the remote server.  It was
quite fast.  Threading was key.

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