Thanks, Jeremy.

It works.

But the document could be more specific.
At first, I did not know how to set connection_expiration_timeout, but 
found it out by spec test.
I have committed pull request for the document.

在 2016年8月7日星期日 UTC+8上午2:08:09,Jeremy Evans写道:
>
> On Friday, August 5, 2016 at 10:58:00 PM UTC-7, Wang wrote:
>>
>> I am using Sequel with Postgresql, and set :max_connections => 20.
>> In Sequel, it seems that once connection is established, and it would 
>> live forever, until app exit.
>>
>> In production, we run more than 50 instances with Sequel, in threaded app 
>> server Puma.
>> Under high load, all threads are busy, and Postgresql would have more 
>> than 1k connections.
>> After the system load going down, the connections are still there, in 
>> idle state.
>>
>> Though we could close idle connections in Postgresql, but it would be 
>> dangerous for ruby clients.
>>
>> Is there any way to close idle connection with timeout, or limit the 
>> number of idle connection, like SetMaxIdelConn in Golang 
>> <http://go-database-sql.org/connection-pool.html>.
>>
>
> The connection_expiration plugin should be able to do what you want, 
> though it's based on time since initial connection and not based on load.
>
> Thanks,
> Jeremy
>

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