...
* Remove `LIMIT` to prevent any non-deterministic behaviors
This seems counterproductive, as for example PostgreSQL has special
handling of "fast start" queries which is triggered by presence of
LIMIT or OFFSET, so this will miss some optimisations.
Also,it is not like removing LIMIT is some
Have you tried to set the instance running on GCP to have similar
shared_buffers as the AWS database ?
What you described has a much lower cache hit rate on GCS and 2X the
shared buffers on AWS which could well explain much of the difference
in execution times.
DETAILS:
Query explain for Postgres
Hi
po 1. 3. 2021 v 15:59 odesílatel Jung, Jinho napsal:
> Andrew, Bob, Michael
>
> Thanks for the valuable feedback! Even with the default setting,
> PostgreSQL mostly showed good performance than other DBMSs. The reported
> queries are a very tiny portion among all executed queries (e.g., <0.00
Andrew, Bob, Michael
Thanks for the valuable feedback! Even with the default setting, PostgreSQL
mostly showed good performance than other DBMSs. The reported queries are a
very tiny portion among all executed queries (e.g., <0.001%).
As you guided, we will make the follow-up report after we te
On Mon, Mar 1, 2021 at 8:44 AM Bob Jolliffe wrote:
> Was just about to reply similarly. Mind you it perhaps does raise the
> question : are the default postgresql settings perhaps too
> conservative or too static. For example, in the absence of other
> explicit configuration, might it make more
Jung, Jinho schrieb am 28.02.2021 um 16:04:
> # Performance issues discovered from differential test
>
> For example, the below query runs x1000 slower than other DBMSs from
> PostgreSQL.
>
> select ref_0.ol_amount as c0
> from order_line as ref_0
> left join stock as ref_1
>
Was just about to reply similarly. Mind you it perhaps does raise the
question : are the default postgresql settings perhaps too
conservative or too static. For example, in the absence of other
explicit configuration, might it make more sense for many use cases
for postgres to assess the physical
Ha, Andrew beat me to the punch!
Andrew Dunstan wrote on 3/1/2021 7:59 AM:
On 2/28/21 10:04 AM, Jung, Jinho wrote:
# install DBMS
sudo su
make install
adduser postgres
rm -rf /usr/local/pgsql/data
mkdir /usr/local/pgsql/data
chown -R postgres /usr/local/pgsql/data
su - postgres
/usr/local/pgsql
Hi,
It is worthy work trying to compare performance across multiple database
vendors, but unfortunately, it does not really come across as comparing
apples to apples.
For instance, configuration parameters: I do not see where you are
doing any modification of configuration at all. Since DB
On 2/28/21 10:04 AM, Jung, Jinho wrote:
> # install DBMS
> sudo su
> make install
> adduser postgres
> rm -rf /usr/local/pgsql/data
> mkdir /usr/local/pgsql/data
> chown -R postgres /usr/local/pgsql/data
> su - postgres
> /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
> /usr/local/pgsql/bin
# Performance issues discovered from differential test
Hello. We are studying DBMS from GeorgiaTech and reporting interesting queries
that potentially show performance problems.
To discover such cases, we used the following procedures:
* Install four DBMSs with the latest version (PostgreSQL, S
11 matches
Mail list logo
