Description: XID stands for Transaction Identifier, a unique identifier assigned to each transaction in database management systems. This identifier is fundamental for managing concurrency and data integrity within the database. Each time a new transaction is initiated, the system generates an XID that allows tracking and managing the state of that transaction throughout its lifecycle. XIDs are essential for implementing the transaction isolation model, which ensures that concurrent operations do not interfere with each other, thus maintaining data consistency. Additionally, XIDs are used in the row versioning system, enabling the database to maintain multiple versions of a row and manage data visibility based on the state of transactions. This mechanism is key for implementing fault recovery and lock management, as it allows the system to determine which transactions are visible to others and which must be blocked until completion. In summary, XID is a critical component in the architecture of database management systems, ensuring that transactions are handled efficiently and securely, contributing to the robustness and reliability of the system.
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