Get the Whitepaper called Methods Of Quick Exploitation Of Blind SQL Injection.
You can download it from the following link: https://packetstormsecurity.com/files/download/85659/PT-devteev-FAST-blind-SQL-Injection.txt
Source: https://packetstormsecurity.com/files/85659/Methods-Of-Quick-Exploitation-Of-Blind-SQL-Injection.html