Lucene full text serch for 6 million records

I want to implement lucene for full text search.i had a table with 6 million records.it is stored in sql database.each minitues around thousand new rows will be added from application.Index creation in lucene takes lot of time because each time i am deleting and creating new Index from database because user need the updated records on search.now i blocked the search functionality because for Index and document creation it is taking a lot of minitues.how i can fix with problem

Two points to cover:-

1) i need updated and history values on search. 2) how indexing , document creation,Index searching can be done with in 2 sec