https://www.cnblogs.com/Dreamer-1/p/6076440.html
执行计划动作说明
- 表访问的几种方式:(非全部)
- TABLE ACCESS FULL(全表扫描)
- TABLE ACCESS BY ROWID(通过ROWID的表存取)
- TABLE ACCESS BY INDEX SCAN(索引扫描)
- 索引扫描又分五种:
- INDEX UNIQUE SCAN(索引唯一扫描)
- INDEX RANGE SCAN(索引范围扫描)
- INDEX FULL SCAN(索引全扫描)
- INDEX FAST FULL SCAN(索引快速扫描)
- INDEX SKIP SCAN(索引跳跃扫描)
- 表连接的几种方式:
- SORT MERGE JOIN(排序-合并连接)
- NESTED LOOPS(嵌套循环)
- HASH JOIN(哈希连接)
- CARTESIAN PRODUCT(笛卡尔积)