With the rapid development of big data

it becomes more and more important to effectively solve the problems of copyright protection of data

preservation of data information

traceability of data

etc.Database watermarking is the most effective protection technique.The biggest challenge of this technology is how to carry out the embedded watermarking without affecting the data

and how to withstand the various attacks without affecting the extraction of watermark information.In this paper

we first describe the basic concepts and principles of database watermarking;Then

we introduce and classify common database watermarking techniques;Next

we summarize the attack behavior against database watermarking and analyze the anti-attack ability of specific watermarking technology;Moreover

we analyze the typical watermarking technologies based on distortion or not and the existing technical methods of database fingerprint briefly;Finally

we point out the key and shortcomings of current researches

and propose the development direction in the future.