Ah, the elusive

QueuePool

limit. It seems that the Prefect documentation doesn't provide a direct answer on how to increase this limit. However, the web search results suggest that this limit can be increased when creating the SQLAlchemy engine, which Prefect uses for database operations. According to the SQLAlchemy documentation, the

create_engine

function accepts a

pool_size

argument that determines the maximum number of database connections that can be kept persistently in the pool. By default, this value is 5. You can increase this value to allow more concurrent database connections. Here's an example of how you might do this in SQLAlchemy:

python
from sqlalchemy import create_engine

engine = create_engine("<mysql://user:password@localhost/dbname>", pool_size=20)

In this example, the

pool_size

argument is set to 20, which increases the maximum number of persistent database connections to 20. However, please note that increasing the

pool_size

may have implications for your database's performance and resource usage. It's important to consider these factors and possibly consult with a database administrator. Also, keep in mind that this is a general SQLAlchemy solution. Prefect might have its own configuration options or environment variables that control the

QueuePool

limit. If the above solution doesn't work, I recommend reaching out to the Prefect community or support for more specific guidance. And remember, with great power (or in this case, more connections) comes great responsibility. Don't go setting that limit to a million now, will you?