How to Warm Up Connection Pool ?

[mkmo...@gmail.com]

As stated in the docs:

> All SQLAlchemy pool implementations have in common that none of them “pre create” connections - all implementations wait until first use before creating a connection

Is it possible to warm up, or pre create, the connections in the pool?

When I start my server, the connection pool is initially empty. I'm using Oracle and connection initialization has a lot of overhead. I'm seeing as high as 4 seconds sometimes.

The only way I can think of is to spawn a lot of threads that all check out a connection and release it after ~10 seconds. Is there a built in solution for this?

Thanks and best regards,

Matthew

[Mike Bayer]

On Tue, Aug 23, 2022, at 1:54 PM, mkmo...@gmail.com wrote:

As stated in the docs:

> All SQLAlchemy pool implementations have in common that none of them “pre create” connections - all implementations wait until first use before creating a connection

Is it possible to warm up, or pre create, the connections in the pool?

sure do a pre-connect like this:

conns = [engine.connect() for i in range(num_of_connections_you_want)]

for c in conns:

    c.close()

the connections are all made at the same time so that will establish individual connections in the pool.

When I start my server, the connection pool is initially empty. I'm using Oracle and connection initialization has a lot of overhead. I'm seeing as high as 4 seconds sometimes.

The only way I can think of is to spawn a lot of threads that all check out a connection and release it after ~10 seconds. Is there a built in solution for this?

Thanks and best regards,

Matthew

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