Hello Hiep, The database in this case is not a true database in the sense of a SQL database – it doesn’t have fields that can be read. It should not be changed after it is generated – it is really just a binary “blob” that is used for the Hyperscan compile side to communicate with the Hyperscan runtime. Regards, Geoff. From: Hyperscan [mailto:hyperscan-bounces@lists.01.org] On Behalf Of Hiep Pham Sent: Wednesday, October 12, 2016 2:02 PM To: hyperscan(a)lists.01.org Subject: [Hyperscan] issues when researching HyperScan. Dear sir. I read HyperScan document and i found that it uses a compile API to convert regex to a database. I want to know this database having which fields and whether or not i can change it. Thanh you Best regrard, Hiep -- Hanoi University Of Science And Technology , School of Information and Technology, KDE Laboratory, Pham Tuan Hiep, phone: (+84) 918632952