Partition keys, clustering keys, consistency levels, tunable consistency, single-table design and eventual consistency.
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- What is a partition key in Cassandra or DynamoDB?
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The primary key component that determines which node stores the data through hash-based distribution.- How does Cassandra distribute data using partition keys?
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The partition key is hashed to determine which nodes own the partition.- Can you have a composite partition key in Cassandra?
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Yes, multiple columns can be combined to form a single partition key.- What happens if a partition key hash leads to uneven data distribution?
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Some nodes become hot spots and receive more data than others, causing performance imbalance.- What is a clustering key in Cassandra?
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A column that determines the sort order of rows within a partition.- How do clustering keys differ from partition keys?
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Partition keys determine which node stores data, clustering keys determine sort order within a partition.- Can you perform range queries on clustering keys in Cassandra?
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Yes, range queries (greater than, less than, between) on clustering keys are efficient.- In what order are rows sorted within a partition in Cassandra?
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By the clustering key columns, in the order they are defined.- How is a row uniquely identified in Cassandra?
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By the combination of partition key and clustering key together.- Why would you choose a timestamp as a clustering key?
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To keep time-series events ordered within a partition, allowing efficient range queries by time.- What is a consistency level in Cassandra?
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A setting that specifies how many replicas must respond before a read or write is acknowledged.- What does the ONE consistency level mean in Cassandra?
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Only one replica must respond for the operation to be acknowledged.- What does the QUORUM consistency level mean in Cassandra?
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A majority (more than half) of replicas must respond for the operation to be acknowledged.- What does the ALL consistency level mean in Cassandra?
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All replicas must respond for the operation to be acknowledged.- How does stricter consistency affect performance in Cassandra?
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Stricter consistency (more replicas required) increases latency but reduces staleness.
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