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Asked: 2026-06-15T19:48:06+00:00

I have some misunderstanding of pooling mechanism in NHibernate with Npgsql (PostgreSQL DB). How

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I have some misunderstanding of pooling mechanism in NHibernate with Npgsql (PostgreSQL DB).

How does it actually work?
I can set ‘pooling=true’ parameter in DB connection string. On which side pooling will actually be done: NHibernate or PostgreSql? As I know PostgreSql 9.2 does not have its own pool mechanism, how will pooling work in this case?
I also can specify ‘MinPoolSize’ and ‘MaxPoolSize’ parameters in DB connection string. What are these parameters meaning?
When new connection is actually being created (or taken from pool in case ‘pooling=true’)? When I open a new NHibernate session or it is not depending on opening/closing session?

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1 Answer

  1. Editorial Team

    NHibernate does not manage (nor does it really care about) connection pooling. This is a feature of some ADO.Net Providers. Nor would the server necessarily be involved either since any client with enough sophistication can implement its own connection pool. After all, it’s only a matter of keeping a number of spare connections open.

    I believe this is something implemented in Npgsql.

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