Multiple files for a single SQLite database

Question

Afaik, SQLite stores a single database in a single file. Since this would decrease the performance when working with large databases, is it possible to explicitly tell SQLit

Answer 1

The question is about three years old but I landed here when I searched for the very same question. Late I found out, that it IS possible:

Use

sqlite3.exe MainDB.db

ATTACH DATABASE 'SomeTableFile.db' AS stf;

Access the table from the other database file

SELECT * FROM stf.SomeTable;

You can even join over several files

SELECT *
FROM MainTable mt
JOIN stf.SomeTable st
ON (mt.id = st.mt_id);

https://www.sqlite.org/lang_attach.html

tameera said there is a limit of 62 attached databases but I never hit that limit so I can't confirm that.

The big advantage besides some special cases is that you limit the fragmentation in the database files and you can use the VACUUM command separately on each table!