-The maximum numbers of sessions and workers are determined by the service tier and compute size. New requests are rejected when session or worker limits are reached, and clients receive an error message. While the number of connections can be controlled by the application, the number of concurrent workers is often harder to estimate and control. This is especially true during peak load periods when database resource limits are reached and workers pile up due to longer running queries, large blocking chains, or excessive query parallelism.
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