Re: releasing space
От | Adrian Klaver |
---|---|
Тема | Re: releasing space |
Дата | |
Msg-id | eff5fb6b-7b6b-c33a-30a9-f7fd6976de11@aklaver.com обсуждение исходный текст |
Ответ на | Re: releasing space (Julie Nishimura <juliezain@hotmail.com>) |
Ответы |
Re: releasing space
(Tomas Vondra <tomas.vondra@2ndquadrant.com>)
|
Список | pgsql-general |
On 10/19/19 4:17 PM, Julie Nishimura wrote: > Thank you, Thomas. Do you know if it is safe to replicate 9.6.2 > (smaller) db to 9.6.15 (larger capacity) using pg_basebackup? Would it > be considered as an upgrade? pg_basebackup backups an entire Postgres cluster which will be many databases. So when you say db do mean a Postgres cluster or an individual database? > > ------------------------------------------------------------------------ > *From:* Tomas Vondra <tomas.vondra@2ndquadrant.com> > *Sent:* Saturday, October 19, 2019 5:44 AM > *To:* Julie Nishimura <juliezain@hotmail.com> > *Cc:* pgsql-general@lists.postgresql.org > <pgsql-general@lists.postgresql.org>; pgsql-general > <pgsql-general@postgresql.org> > *Subject:* Re: releasing space > On Thu, Oct 17, 2019 at 05:20:09PM +0000, Julie Nishimura wrote: >>Hello everybody, We are running PostgreSQL 9.6.2 cluster master -> >>standby (streaming replication). 22 tb of space (constantly struggling >>with the space, pruning the old data, but not fast enough). The biggest >>db takes 16 tb. So, we've copied it to another server, and now we would >>like to delete it from our original source, to free up the space. What >>would be the right approach for this? Just issue drop database command >>(16tb). How long it might take? Should we do it gradually (drop biggest >>tables first)? Any suggestions? Caveats? >> > > Generally speaking, DROP DATABASE simply recursively drops all the > various objects - indexes, tables, etc. It mostly just deleting the > files, which should not be very expensive (we certainly don't need to > delete all the data or anything), but there's certain number of I/O > involved. But it does depend on the OS / filesystem / hardware if that's > an issue. > > So if you want to be on the safe side, you can drop the objects one by > one, with a bit of delay between them, to throttle the I/O a bit. > > FWIW the latest minor release for 9.6 is 9.6.15, you're 13 minor > versions (~30 months) of fixes behind. You might want to consider > upgrading ... > > > -- > Tomas Vondra http://www.2ndQuadrant.com > PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Adrian Klaver adrian.klaver@aklaver.com
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