摘要:
Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log data. It has a simple 阅读全文
摘要:
1.创建索引一.要尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引 (1)在经常需要进行检索的字段上创建索引,比如要按照表字段username进行检索,那么就应该在姓名字段上创建索引,如果经常要按照员工部门和员工岗位级别进行检索,那么就应该在员工部门和员工岗位级别 阅读全文