Junior — Middle
Can you explain what VACUUM is in database management systems?
sobes.tech AI
Answer from AI
VACUUM — is an operation in database management systems (such as PostgreSQL or SQLite) that serves to clean and optimize data storage.
When data is deleted or updated, 'dead' records remain in the database, occupying space and potentially slowing down performance. VACUUM removes these unused records, freeing space and improving performance.
In SQLite, for example, the VACUUM command rewrites the entire database, eliminating fragmentation and reducing the file size.
Example of usage in SQL:
VACUUM;
Thus, VACUUM helps maintain the database in an optimal state.