mongodb 索引讲解与性能调优 目录 一、 为什么用索引: ............................................................................................................... 1 二、 索引管理: ....................................................................................................................... 1 a) 查询索引: ....................................................................................................................... 1 i. 查询已有索引的明细: ........................................................................................... 1 ii. 查询索引大小: ....................................................................................................... 2 b) 创建索引: ....................................................................................................................... 2 c) 删除索引: ....................................................................................................................... 2 d) 修改索引: ....................................................................................................................... 2 三、 索引种类: ....................................................................................................................... 3 a) 默认索引: ....................................................................................................................... 3 b) 单列索引: ....................................................................................................................... 3 c) 组合索引: ....................................................................................................................... 3 d) 子文档索引: ................................................................................................................... 3 e) 唯一索引: ....................................................................................................................... 3 f) Sparse 索引: ..............