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Does GeoServer use a connection to my PostGIS database for every layer in a group layer?

I have a Tomcat JNDI configuration with a maximum pool-size of 25. One of these group-layers has for example 9 layers. Every layer is in the same workspace and used the same data store. All of them are via JNDI PostGIS.

Will all layers be processed sequentially or in parallel?

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Data retrieval during rendering is processed sequentially. One connection should be active for that one WMS request, regardless of how many layers/groups are in the request.

However, the connection pool will hold as many as configured in the store panel, to avoid closing and re-opening them all the time.

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