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Transactions are a collection of successive DB operations that modify a database from a consistent state to another consistent state.
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PostgreSQL supports multi-version concurrency control (MVCC) for transaction management
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A Lost Update occurs when two or more transactions are each waiting for a resource that is held by another transaction?
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In a centralized database system, geographical limitations might cause higher latency for users far from the central server
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The ROWA approach for synchronous replication requires all replicas to be changed synchronously before a transaction completes
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Distributed database systems can use middleware to coordinate queries and transactions
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A "lost update" is a situation where a transaction tries to modify the same value at the same time as another transaction, and one of the modifications is lost.
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During the voting phase of 2PC, participants save the status of subtransactions in their local logs and send either a yes or no message to the coordinator, indicating their readiness to commit
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Distributed transaction atomicity is crucial for distributed databases, as they prioritize speed over transaction consistency
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Two transactions are in conflict if they modify and work on different data objects.
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