Re: migration of 100+ tables

On 3/10/19 9:07 PM, Julie Nishimura wrote:
> Oh, this is great news! Yay, thanks!

Just be aware, where -n = --schema:

https://www.postgresql.org/docs/10/app-pgdump.html

"
Note

When -n is specified, pg_dump makes no attempt to dump any other
database objects that the selected schema(s) might depend upon.
Therefore, there is no guarantee that the results of a specific-schema
dump can be successfully restored by themselves into a clean database.
"

So any relationships across schema will not be preserved.

>
> ------------------------------------------------------------------------
> *From:* Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
> *Sent:* Sunday, March 10, 2019 6:28 PM
> *To:* Julie Nishimura; pgsql-general(at)lists(dot)postgresql(dot)org
> *Subject:* Re: migration of 100+ tables
> On 3/10/19 5:53 PM, Julie Nishimura wrote:
>> Hello friends, I will need to migrate 500+ tables  from one server (8.3)
>> to another (9.3). I cannot dump and load the entire database due to
>> storage limitations (because the source is > 20 TB, and the target is
>> about 1.5 TB).
>>
>> I was thinking about using pg_dump with customized -t flag, then use
>> restore. The table names will be in the list, or I could dump their
>> names in a table.  What would be your suggestions on how to do it more
>> efficiently?
>
> The sizes you mention above, are they for the uncompressed raw data?
>
> Are the tables all in one schema or multiple?
>
> Where I am going with this is pg_dump -Fc --schema.
>
> See:
> https://www.postgresql.org/docs/10/app-pgrestore.html
>
> The pg_restore -l to get a TOC(Table of Contents).
>
> Comment out the items you do not want in the TOC.
>
> Then pg_restore  --use-list.
>
> See:
>
> https://www.postgresql.org/docs/10/app-pgrestore.html
>
>>
>> Thank you for your ideas, this is great to have you around, guys!
>>
>>
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com