![]() Auto-vacumm cannot be turned on or off after a table has been created. Therefore, auto-vacumm must be enabled before the table is built. Some additional information needs to be stored in the database to record that each database page it tracks gets its pointer back. To use auto-vacuum, a few prerequisites are required. Also, the.db-journal file is generated when the delete operation is performed. In fact, auto-vacuum creates more fragmentation due to the need to move pages around in the database file. But the second method also has the disadvantage of truncating pages from the free list from the database file without reclaiming fragments from the database or rearranging the contents of the database like the VACUUM command does. ![]() In the database file setup, set auto_VACUUM to "1". After data is deleted, manually run the SQL"VACUUM" command. But disk space is not returned to the operating system either. SQLite-net was designed as a quick and convenient database layer. It was first designed to work with Xamarin.iOS, but has since grown up to work on all the platforms (Xamarin. NET Core, and Mono applications to store data in SQLite 3 databases. The reason: After deleting data from Sqlite, unused disk space is added to an internal "free list" for storing the next data you insert. SQLite-net is an open source, minimal library to allow. When you delete a lot of data in SQLite, the size of the database file remains the same. sqlite3 Test.db -init insert_data.Posted on Oct. Here’s yet another way you can run SQL scripts from a file with SQLite. sqlite3 Test.db < insert_data.sql The -init Option The following method redirects the input to the database file when using sqlite3 to connect to SQLite and open the database. If you’re on Windows, you might need to do this: sqlite3.exe Test.db ".read insert_data.sql" Redirect the Input to the Database when Connecting to SQLite However, with this example, you run it from outside of SQLite. The difference between this example and the previous, is that the previous one was done from within SQLite after you’d already connected. sqlite3 Test.db ".read insert_data.sql"ĭoing this will insert the data into the specified database from the command line. Specify the full path if in a different directory. This example reads the script insert_data.sql from the current folder/directory. If you’re already connected to SQLite, you can use the. I was able to run this script directly from my Terminal window, without connecting to SQLite using the SQLite3 command. Then, SQLite copies the content of the temporary database file back to the original database file. This operation defragments the database objects, ignores the free spaces, and repacks individual pages. SQLite first copies data within a database file to a temporary database. ![]() This assumes my script is called create_table.sql and I want to run it against the Test.db database. SQLite provides the VACUUM command to address all three issues above. ![]() The following code demonstrates the first option for running an SQL script from a file in SQLite. This can be especially useful when you have a large script (such as creating a bunch of database tables and inserting data into those tables).īelow are five ways to run SQL scripts directly from a file in SQLite. SQLite provides us with the ability to run scripts directly from a file. ![]()
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