The Trill central database was the main repository of data about the Trill and their homeworld.

In 2371, this database was accessed by Doctor Julian Bashir in order to learn more about Joran Belar. Belar's file only listed his birth and death stardates. Comparing the data compression ratio of this file to other files, it was discovered that Belar's file was five times smaller than similar files, proving that a large part of the file had been deleted. An investigation revealed that the Symbiosis Commission was responsible for this action.

Pursuant to his inquiries, Bashir also accessed the historical records of the Dax symbiont's hosts and the enrollment records of Trill music academies. (DS9: "Equilibrium")

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