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      Question

      What does the term "serializable" refer to in the

      context of database transactions?
      A The ability of a database to serialize data into a text file for backup purposes. Correct Answer Incorrect Answer
      B The property of a transaction that ensures it runs concurrently with other transactions without causing inconsistencies. Correct Answer Incorrect Answer
      C The property of a schedule where the transactions can be reordered to produce the same result as if they were executed sequentially. Correct Answer Incorrect Answer
      D The ability to serialize a database schema into a class diagram for object-oriented design. Correct Answer Incorrect Answer
      E The process of converting a database transaction into a serializable data format for external storage. Correct Answer Incorrect Answer

      Solution

      In the context of database systems, serializability is a critical property of transaction scheduling that ensures the correctness of concurrent transactions. A schedule (or execution sequence) of transactions is considered serializable if it can be transformed into a serial schedule—where transactions are executed one after the other without overlapping—by reordering the transactions, without changing the final outcome of the transactions. The concept of serializability ensures that even if multiple transactions are executed concurrently, the database remains consistent and the result is the same as if the transactions had been executed in some sequential order. This property is essential for maintaining the integrity of the database and preventing anomalies such as lost updates, temporary inconsistencies, and uncommitted data. Here’s an MCQ based on dense indexing in database systems:

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