Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade

I confess I don't do dump or any backups much other than file system
snapshots.

But when I do, I don't like how long it takes.

I confess my database is big, I have about 200 GB. But still, dumping it
should not take 48 hours (and running) while the system is 75% idle and
reads are at 4.5 MB/s when the system sustains over 100 MB/s during
processing of table scan and hash join queries.

Something is wrong with the dump thing. And no, it's not SSL or
whatever, I am doing it on a local system with local connections.
Version 9.5 something.

regards,
-Gunther

On 11/23/2017 4:26, Henrik Cednert (Filmlance) wrote:
>
>
>> On 22 Nov 2017, at 22:07, Patrick KUI-LI <pkuili(at)hipay(dot)com
>> <mailto:pkuili(at)hipay(dot)com>> wrote:
>>
>> Hello,
>>
>> I had this behaviors when the upgraded pg 9.5 was on ssl mode by default.
>>
>> So i deactivated ssl mode in postgresql.conf. That's all.
>>
>> Regards,
>>
>> Patrick
>>
>
>
> Hello
>
> And you just uncommented the  'ssl = off' line in the config for this?
>
> Is this default behaviour different from 8.4? Is there a 'show running
> config' for pgsql?
>
> I tried that in the test vm and didn't really give me a significant
> difference.
>
> COMPRESSION LEVEL: 6, SSL ON
> real82m33.744s
> user60m55.069s
> sys3m3.375s
>
> COMPRESSION LEVEL: 6, SSL OFF
> real76m31.083s
> user61m23.282s
> sys1m23.341s