Many a times databases features failure and are not easily recoverable whereas some of the databases are capable of fault tolerance. Transaction processing is one of the critically handled concepts. Explain in detail.

Databases are critical components of modern applications and systems that store, manage, and retrieve data efficiently. However, databases can sometimes fail due to various reasons such as hardware failures, software bugs, network outages, or human errors. When a database fails, it can result in data loss, downtime, and reduced productivity. Therefore, it is important to design databases that are fault-tolerant, which means that they can continue to operate even in the face of failures without losing data or disrupting service.

One of the critical concepts in database fault tolerance is transaction processing. A transaction is a sequence of one or more database operations that are treated as a single logical unit of work. Transactions are used to maintain the integrity and consistency of the database by ensuring that either all the ________ _________ ____ _____ ___ ______ _______ _____ _____.
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