- + – 使用索引（定位，group，order）
- 不要依赖sql完成计算工作（file sort，join，tmptable、求和）
- 严格控制那种随着历史数据的积累，exam rows越来越大的查询
- 当数据量放大到千万级别，exam rows是否能小于2k
- No sql
- + – 然后、要知道实际访问量（Requests/Sec），及趋势
- + – 基于任务的网格分布式计算
- + – Map-reduce分布式计算
- Keep it simple, stupid
- Do one thing, and do it well
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