[server] use a LifoQueue in _CnxSetPool
In postgresql, some cache is attached to the connection. Using a LifoQueue (last-in, first-out) makes a few connections to get the most load which give best performance.
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In postgresql, some cache is attached to the connection. Using a LifoQueue (last-in, first-out) makes a few connections to get the most load which give best performance.