SQL查询变得非常慢

Question

select  * from RmiMember 
  WHERE  [LastName] like ('li%') AND [FirstName] like ('ma%') 
  ORDER BY FullName asc

0.3秒

这个简单的查询需要0.300秒才能运行，但是一旦我添加前10位，它将变为3.0秒，如果将其更改为前100位，则需要0.300秒！

select top 10 * from RmiMember 
  WHERE  [LastName] like ('li%') AND [FirstName] like ('ma%') 
  ORDER BY FullName asc

3.0秒