https://wiki.quizz.vn/ 2026-04-15T21:20:30+00:00 https://wiki.quizz.vn/ https://wiki.quizz.vn/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2025-12-28T07:18:35+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.quizz.vn/doku.php?id=aws:database:dynamodb:gsi&rev=1766906315&do=diff Global Secondary Index (GSI) What it is: A secondary index with a different partition key (and optional sort key) than the base table. What it’s for: * Query the table using alternate keys (different access patterns). Key ideas: * “Global” means it spans all partitions (not limited to one partition key like LSI). text/html 2025-12-28T07:18:50+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.quizz.vn/doku.php?id=aws:database:dynamodb:lsi&rev=1766906330&do=diff Local Secondary Index (LSI) What it is: A secondary index that uses the same partition key as the base table but a different sort key. What it’s for: * Query different sort orders within the same partition key. Key ideas: * Must be created at table creation time (typical exam point). text/html 2025-12-28T07:18:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.quizz.vn/doku.php?id=aws:database:dynamodb:partition-key&rev=1766906284&do=diff Partition Key What it is: The primary key attribute that determines how data is distributed across partitions. What it’s for: * Fast lookup and scalable distribution. Key ideas: * Items with the same partition key are stored together. * Choosing a good partition key prevents “hot partitions”. text/html 2025-12-28T07:18:19+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.quizz.vn/doku.php?id=aws:database:dynamodb:sort-key&rev=1766906299&do=diff Sort Key What it is: An optional secondary key that, combined with partition key, forms a composite primary key. What it’s for: * Query multiple related items within the same partition key (range queries). * Organize items by time or category (e.g., userId + timestamp). text/html 2025-12-28T07:19:05+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.quizz.vn/doku.php?id=aws:database:dynamodb:streams&rev=1766906345&do=diff DynamoDB Streams What it is: A change data capture feature that records item-level changes in a DynamoDB table. What it’s for: * Trigger downstream processing (often with Lambda). * Build event-driven architectures (audit, replication, search indexing).