What Is Active-Passive Architecture? In an active-passive architecture, a single primary node handles all incoming traffic — reads and writes. […]
What Is Multi-Master Replication? In multi-master replication, all nodes are primaries — every node accepts both reads and writes simultaneously.
What Is a Lock-Free Queue? A lock-free queue provides a progress guarantee: at least one thread makes progress even if
CAS Semantics Compare-and-swap (CAS) is a single atomic operation: compare the current value at a memory location with an expected
Single-Leader Model In leader-follower (primary-replica) replication, all writes are routed to a single designated leader. The leader applies writes to
What Is Optimistic Locking? Optimistic locking is a concurrency control strategy based on the assumption that conflicts between concurrent transactions
What Is Pessimistic Locking? Pessimistic locking is a concurrency control strategy that assumes conflicts are likely and acquires locks before
What Is a Deadlock? A deadlock is a situation where two or more transactions are each waiting for a lock
What Is Read Committed Isolation? Read committed is the weakest practical isolation level. It guarantees that a transaction only reads
What Is Repeatable Read Isolation? Repeatable read is an isolation level that guarantees a transaction always sees the same data
What Is Serializable Isolation? Serializable isolation is the strongest standard isolation level. It guarantees that the result of executing a
What Are Monotonic Reads? Monotonic reads is a consistency guarantee that prevents a client from observing time going backward. Once
What Is Causal Consistency? Causal consistency is a consistency model that sits between eventual consistency and linearizability. If operation A
What Is Session Consistency? Session consistency is a client-centric consistency model that provides guarantees within the scope of a single
Why Cross-Region Replication? Cross-region replication serves three primary goals: disaster recovery (survive a full regional outage), lower read latency for
