Thread: pgsql-performance issue

Dear Sir/Mam,

I have a PostgreSQL 9.5 instance running on Windows 8 machine with 4GB
of RAM.This server is mainly used for inserting/updating large amounts
of data via copy/insert/update commands, and seldom for running select
queries.

Here are the relevant configuration parameters I changed:

max_connections = 100
shared_buffers = 512MB
effective_cache_size = 3GB
work_mem = 12233kB
maintenance_work_mem = 256MB
min_wal_size = 1GB max_wal_size = 2GB
checkpoint_completion_target = 0.7
wal_buffers = 16MB
default_statistics_target = 100

After setting in postgresql.conf. I run the select query to fetch large
amount of record of 29000 in postgresql but it takes 10.3 seconds but
the same query takes 2 seconds for execution in MSSQL.

So my query is how to improve the perfermance in postgresql.

Regards,
Debasis Moharana
.NET Software Developer

Hi,

On 2016-08-20 08:38:43 +0000, debasis.moharana@ipathsolutions.co.in wrote:
> I have a PostgreSQL 9.5 instance running on Windows 8 machine with 4GB of
> RAM.This server is mainly used for inserting/updating large amounts of data
> via copy/insert/update commands, and seldom for running select queries.
>
> Here are the relevant configuration parameters I changed:
>
> max_connections = 100
> shared_buffers = 512MB
> effective_cache_size = 3GB
> work_mem = 12233kB
> maintenance_work_mem = 256MB
> min_wal_size = 1GB max_wal_size = 2GB
> checkpoint_completion_target = 0.7
> wal_buffers = 16MB
> default_statistics_target = 100
>
> After setting in postgresql.conf. I run the select query to fetch large
> amount of record of 29000 in postgresql but it takes 10.3 seconds but the
> same query takes 2 seconds for execution in MSSQL.
>
> So my query is how to improve the perfermance in postgresql.

Please provide the output EXPLAIN (ANALYZE, BUFFERS) yourquery; and your
query. Then we'll possibly be able to help you - atm we don't have
enough information.

Regards,

Andres