Re: [sqlalchemy] Multiple Database Connection

[Mustafa Demiraslan]

Yes all of these are a database not schema.
Thank you for response.

Mike Bayer , 22 Mar 2022 Sal, 18:27 tarihinde
şunu yazdı:

> 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.
>
>
>
> On Tue, Mar 22, 2022, at 10:26 AM, Mustafa Demiraslan wrote:
>
> Current structure is like this:
>
> [image: image.png]
>
> I can't manage pooling for green colored databases.
>
>
> Mike Bayer , 22 Mar 2022 Sal, 17:12 tarihinde
> şunu yazdı:
>
>
> for one engine with 18 databases, what is "switching the bindings"  ?  do
> you mean you call "USE " 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.
>
> On Tue, Mar 22, 2022, at 9:41 AM, Mustafa Demiraslan wrote:
>
> 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
>
>
> --
> 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
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> 
> .
>
>
>
> --
> 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
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> 
> .
>
>
> --
> 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
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> 
> .
>
>
> --
> 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
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> 

Re: [sqlalchemy] Multiple Database Connection

[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.



On Tue, Mar 22, 2022, at 10:26 AM, Mustafa Demiraslan wrote:
> Current structure is like this:
> 
> image.png
> 
> I can't manage pooling for green colored databases. 
> 
> 
> Mike Bayer , 22 Mar 2022 Sal, 17:12 tarihinde şunu 
> yazdı:
>> __
>> for one engine with 18 databases, what is "switching the bindings"  ?  do 
>> you mean you call "USE " 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.
>> 
>> On Tue, Mar 22, 2022, at 9:41 AM, Mustafa Demiraslan wrote:
>>> 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
>>> 
>>> 
>>> -- 
>>> 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+unsubscr...@googlegroups.com.
>>> To view this discussion on the web visit 
>>> https://groups.google.com/d/msgid/sqlalchemy/f196963c-9a0b-4359-b972-27010dfdcaden%40googlegroups.com
>>>  
>>> .
>> 
>> 
>> 
>> -- 
>> 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+unsubscr...@googlegroups.com.
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/sqlalchemy/97a1ad3f-2752-4fc4-9997-fcefff3b4589%40www.fastmail.com
>>  
>> .
> 
> 
> -- 
> 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+unsubscr...@googlegroups.com.
> To view this discussion on the web visit 
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>  
> .

-- 
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.
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Re: [sqlalchemy] Multiple Database Connection

[Mustafa Demiraslan]

Current structure is like this:

[image: image.png]

I can't manage pooling for green colored databases.


Mike Bayer , 22 Mar 2022 Sal, 17:12 tarihinde
şunu yazdı:

> for one engine with 18 databases, what is "switching the bindings"  ?  do
> you mean you call "USE " 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.
>
> On Tue, Mar 22, 2022, at 9:41 AM, Mustafa Demiraslan wrote:
>
> 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
>
>
> --
> 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+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/sqlalchemy/f196963c-9a0b-4359-b972-27010dfdcaden%40googlegroups.com
> 
> .
>
>
> --
> 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+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/sqlalchemy/97a1ad3f-2752-4fc4-9997-fcefff3b4589%40www.fastmail.com
> 
> .
>

-- 
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.
--- 
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Re: [sqlalchemy] Multiple Database Connection

[Mike Bayer]

for one engine with 18 databases, what is "switching the bindings"  ?  do you 
mean you call "USE " 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.

On Tue, Mar 22, 2022, at 9:41 AM, Mustafa Demiraslan wrote:
> 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
> 
> 
> -- 
> 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+unsubscr...@googlegroups.com.
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/sqlalchemy/f196963c-9a0b-4359-b972-27010dfdcaden%40googlegroups.com
>  
> .

-- 
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.
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[sqlalchemy] 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

-- 
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.
--- 
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