Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade - Mailing list pgsql-performance

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 22 Nov 2017, at 22:07, Patrick KUI-LI <pkuili@hipay.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

real 82m33.744s

user 60m55.069s

sys 3m3.375s

 

COMPRESSION LEVEL: 6, SSL OFF

real 76m31.083s

user 61m23.282s

sys 1m23.341s