Hi,
On 2019-05-06 16:54:08 +0530, Siddharth Karandikar wrote:
> I am trying to restore database dump created on PostgreSQL 9.5.16 to
> PostgreSQL 10.7 and it is taking a lot of time to restore. Restoring
> the same dump to 9.5 doesn't take that much. So I am wondering what
> could be reason behind this slowness.
Is there any chance the configuration is different between 9.5 and 10?
If there e.g. is an index on the table, the maintanance_work_mem setting
would make a large differerence when rebuilding. Note that the
medium-tablecase is noticably faster in 10 and that there's been some
speedup work around that in 10.
>
> Postgres configuration that I have on this setup:
> shared_buffers = 128MB
>
> work_mem = 1MB
> maintenance_work_mem = 16MB
maintenance_work_mem = 16Mb is a very low value - it's e.g. used for
index builds, to sort the data.
Greetings,
Andres Freund
