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What is the best configuration for pgBouncer in my case?

I have only 1 database, 1 user and the max_connections in postgresql.conf is 1024.

The currently config of my pgbouncer.config is:

max_client_conn = 1024
default_pool_size = 1024
min_pool_size = 32
;max_db_connections = 50
;max_user_connections = 50
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It would be great to know how many connections you spect to handle at the same time.

I would size this depending on your server hardware use expectations

If you expect 1024 concurrent connections as much this setting is correct.

max_client_conn = 1024

But here are the changes that worked for me. If you change the pooling mode you can reduce the default_pool_size, this increased my performance

pool_mode = transaction
default_pool_size = 50

Take a look at the different pooling modes to see if you can benefit from a more efficient pooling mode than the default value session pool mode.

Session pooling Most polite method. When client connects, a server connection will be assigned to it for the whole duration it stays connected. When client disconnects, the server connection will be put back into pool. This mode supports all PostgeSQL features.

Transaction pooling Server connection is assigned to client only during a transaction. When PgBouncer notices that transaction is over, the server will be put back into pool. This mode breaks few session-based features of PostgreSQL. You can use it only when application cooperates by not using features that break. See the table below for incompatible features.

Statement pooling Most aggressive method. This is transaction pooling with a twist - multi-statement transactions are disallowed. This is meant to enforce "autocommit" mode on client, mostly targeted for PL/Proxy.

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