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1. Db browser for sqlite size of table how to#
2. Db browser for sqlite size of table code#
3. Db browser for sqlite size of table free#

Db browser for sqlite size of table code#

VACUUM schema-name INTO filename Code language: SQL (Structured Query Language) ( sql )

Db browser for sqlite size of table how to#

The following shows how to run the VACUUM command:

It is a good practice to run the VACUUM command manually. In other words, the VACUUM command will not run successfully if the database has a pending SQL statement or an open transaction.Ĭurrently, as of version 3.9.2, you can run the VACUUM command on the main database, not the attached database file.Įven though SQLite enables the auto-vacuum mode that triggers the vacuum process automatically with some limitations. Also, the VACUUM command requires exclusive access to the database file. It is important to note that the VACCUM command requires storage to hold the original file and also the copy. It is a good practice to perform the VACUUM command periodically, especially when you delete large tables or indexes from a database. Besides changing the rowid values, the VACUUM command also builds the index from scratch. However, if you use unaliased rowid, the VACUUM command will reset the rowid values. If you use INTEGER PRIMARY KEY column, the VACUUM does not change the values of that column. The VACUUM command does not change the content of the database except the rowid values. To do this, you set new values using pragma and then vacuum the database. The original database file is overwritten.īecause the VACUUM command rebuilds the database, you can use it to change some database-specific configuration parameters such as page size, page format, and default encoding. Then, SQLite copies the content of the temporary database file back to the original database file.

Db browser for sqlite size of table free#

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. SQLite provides the VACUUM command to address all three issues above. Therefore, it increases the number of pages to hold a table. Because of this, it increases storage overhead for the table, takes more time to read/write, and decreases the cache performance. It decreases the number of rows that can be stored in a single page. Third, the insert, update and delete operations create unused data block within individual database pages. Second, when you insert or delete data from the tables, the indexes and tables become fragmented, especially for the database that has a high number of inserts, updates, and deletes. As a result, the size of the database file always grows in size. Why do you need SQLite VACUUM commandįirst, when you drop database objects such as tables, views, indexes, and triggers or delete data from tables, the database file size remains unchanged. Because SQLite just marks the deleted objects as free and reserves it for the future uses. Summary: in this tutorial, we will explain why you need to use the SQLite VACUUM command and show how to use it to optimize the database file.