空间数据和SQL Server：非常慢的查询

Currently I am using SQL Server and having issues, i have a table Adress with 12M of addresses; when i look for one addresses; its take 3 or 4 minutes to find it. i have to look for more than 40000 adressess averyday in my table. so Sql server dont help me to resolve this problem. i think about using an other SGBD maybe MongoDB, but i dont have any idea if it will work or not. my goal is to find every query in less than 2 sec.Currently I am using SQL Server and having issu