How SQLite Helps You Do ACID

SQLite, a popular database engine, uses journals to ensure atomicity and isolation of transactions. The rollback journal is one such technique that records the state of the database before any changes are made. In case of an error or failure during a transaction, the rollback journal can be used to revert the database back to its previous state. This mechanism ensures data consistency and durability. However, it may cause bottlenecks in applications with concurrent users as it blocks all other transactions when writing is performed. SQLite has introduced write-ahead log (WAL) and wal2 journaling modes for better support of concurrent readers.