scala数组操作：Array / ArrayBuffer mysql分页offset过大，sql优化经验：

scala数组操作：Array / ArrayBuffer

https://www.cnblogs.com/HeQiangJava/p/6706951.html

http://blog.csdn.net/caiandyong/article/details/51992329

mysql分页offset过大，sql优化经验：

https://segmentfault.com/a/1190000005007706