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java访问数据库的连接池用到了DBCP，常发生连接断开，影响对数据库查询性能问题，该如何优化？

java访问数据库的连接池用到了C3P0，但经常发生管道破裂，导致有事务的性能问题，该如何优化？

请问java 应用程序执行分组查询数据库表时性能非常慢，该如何优化呢？

请问在java应用程序中查询计算数据库表最大值max时性能非常慢，该如何优化呢？

请问java应用程序对数据库表聚合count统计查询时性能非常慢，该如何优化呢？

请问在java应用程序中执行数据库表模糊查询时性能非常低，该如何优化呢？

请问在java应用程序中查询计算数据库表最小值min时性能非常低，该如何优化呢？

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