This step has to be done again whenever you create a new database connection in the future.
将来只要创建一个新数据库连接,就需要执行这个步骤。
By keeping the connection alive, the overhead of establishing a new connection is eliminated and hence future requests from the browser is served faster.
通过让连接继续处于活动状态,可以省去建立新连接的开销,从而使浏览器可以更快地为以后的请求提供服务。
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