You can access any sqlite database file, as long there is no other client locking it, using the command line client to perform SQL commands:
sqlite3 <database file>
To list the schema of a sqlite database run
SELECT name FROM sqlite_master;
It will dump all schema elements. One field of the result table contains the SQL used to create each schema element. If you only want a list of tables use the client command ".tables"
Dump Database as SQL
To dump the entire database content in SQL for example for a backup run:
sqlite3 <database file> .dump >output.sql
See the next sections how to dump a single table or in SQL.
Dump Table as SQL
To dump the SQL to create a table and its values run the command line client using the ".dump" command an redirect the output:
sqlite3 <database file> ".dump <table name>" >output.sql
Dump Table as CSV
To dump the SQL to create a table and its values run the command line client using the ".mode" command to enable CSV output and then to perform a "SELECT" on the table you want to dump. By echoing this to the CLI you can easily redirect the output:
echo ".mode csv select * from <table name>;" | sqlite3 >output.sql
Cleanup with Vacuum
To run a one time cleanup just run the following command on an sqlite database file. Ensure there is no program accessing the database file. If there is it will fail and do nothing:
sqlite3 my.db "VACUUM;"
If you want sqlite to perform vacuum on-demand you can set the "auto_vacuum" pragma to either "INCREMENTAL" or "FULL":
PRAGMA auto_vacuum = INCREMENTAL; PRAGMA auto_vacuum = FULL;
To quere the current "auto_vacuum setting run
Read more in this detailed post about sqlite vacuuming!