Multiple Database Connection

[Mustafa Demiraslan]

Hi team,
I am using 3 database engines at the same time, 1(include 1 database) + 1(include 1 database) + 1(include 18 database). I use the database containing 18 databases by switching the bindings. I connect to database using sessions with session_maker for each engine. During the load test, I am stuck on the max_connection limit for the part containing 18 databases. Do you think the right approach is to create a separate engine for each database(1+1+18 engine) or is it a single engine multiple binding? I would be very happy if you express your thoughts.

Regards,

Mustafa

[Mike Bayer]

for one engine with 18 databases, what is "switching the bindings"  ?  do you mean you call "USE <database>" on the connection ?  

creating 18 separate engines would not be that big a deal if that's what works best for the code, no issue doing that.

--

SQLAlchemy -

The Python SQL Toolkit and Object Relational Mapper

 

http://www.sqlalchemy.org/

 

To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description.

---

You received this message because you are subscribed to the Google Groups "sqlalchemy" group.

To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+...@googlegroups.com.

To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/f196963c-9a0b-4359-b972-27010dfdcaden%40googlegroups.com.

[Mustafa Demiraslan]

Current structure is like this:

I can't manage pooling for green colored databases. 

Mike Bayer <mik...@zzzcomputing.com>, 22 Mar 2022 Sal, 17:12 tarihinde şunu yazdı:

To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/97a1ad3f-2752-4fc4-9997-fcefff3b4589%40www.fastmail.com.

[Mike Bayer]

a single Engine only points to one database URL at a time.   so to that extent, as an Engine assumes there's a "default database" when it connects, any concept of multiple "databases" beneath that is not something the Engine is aware of.   

PostgreSQL itself has no "USE" command, so if you have a connection to a PostgreSQL database, that's the one you're talking to, so given this architecture you would definitely need to create an individual Engine per database.

OTOH if these are actually PostgreSQL **schemas** and not databases, that would be something entirely different, but you haven't specified this.

To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/CAM%2BjLs8-po%3DoFJyv1vFKionj8nuMpUU2DQm7AvkHTOEYUbi1QQ%40mail.gmail.com.

[Mustafa Demiraslan]

Yes all of these are a database not schema.

Thank you for response.

Mike Bayer <mik...@zzzcomputing.com>, 22 Mar 2022 Sal, 18:27 tarihinde şunu yazdı:

To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/bddd27ef-3c59-4b24-b3f3-e42b0876886c%40www.fastmail.com.