Note ID
- +Whereas some applications use file names to uniquely identify notes, Trilium + uses the concept of Note ID.
+Generally, the Note ID is a 12-character long alphanumeric sequence (including + both lower and upper case letter) that is randomly generated for each new + note.
+How does the import/export affect the note IDs
+When notes are exported, their note ID is kept in the metadata of the + export. However when they are imported back in, a new note ID is generated + for all the notes. This also includes other entities that are part of the + import/export process such as Attachments.
+Note collisions
+Since the Note ID is a fixed-width randomly generated number, due to the + pigeonhole principle, there is a possibility that a newly created + note will have the same ID as an existing note.
+Since the note ID is alphanumeric and the length is 12 we have + \(62^{12}\) unique IDs. However since we are generating them + randomly, we can use a collision calculator such as the one for Nano ID to + determine that we'd need to create 1000 notes per hour every hour for 9 + centuries in order to have at least 1% probability of a note collision.
+As such, Trilium does not take any explicit action against potential note + collisions, similar to other software that makes uses of unique hashes + such as Git. + If one would theoretically occur, what would most likely happen is that + the existing note will be replaced by the new one.
+