{"id":4747,"date":"2025-08-23T15:35:31","date_gmt":"2025-08-23T15:35:31","guid":{"rendered":"https:\/\/uplatz.com\/blog\/?p=4747"},"modified":"2025-08-27T02:55:45","modified_gmt":"2025-08-27T02:55:45","slug":"dynamodb-pocket-book","status":"publish","type":"post","link":"https:\/\/uplatz.com\/blog\/dynamodb-pocket-book\/","title":{"rendered":"DynamoDB Pocket Book"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/16-1024x576.png\" alt=\"DynamoDB Pocket Book\" width=\"840\" height=\"473\" class=\"alignnone size-large wp-image-4848\" srcset=\"https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/16-1024x576.png 1024w, https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/16-300x169.png 300w, https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/16-768x432.png 768w, https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/16.png 1280w\" sizes=\"auto, (max-width: 840px) 100vw, 840px\" \/><br \/>\n<!-- DynamoDB Pocket Book \u2014 Uplatz (50 Cards, Wide Layout, Readable Code, Scoped Styles) --><\/p>\n<div style=\"margin: 16px 0;\">\n<style>\n    .wp-nodejs-pb { font-family: Arial, sans-serif; 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background:#fff1f2 !important; }\n    .bg-cyan{ border-left-color:#06b6d4 !important; background:#ecfeff !important; }\n    .bg-lime{ border-left-color:#16a34a !important; background:#f0fdf4 !important; }\n    .bg-orange{ border-left-color:#f97316 !important; background:#fff7ed !important; }\n    .bg-indigo{ border-left-color:#6366f1 !important; background:#eef2ff !important; }\n    .bg-emerald{ border-left-color:#22c55e !important; background:#ecfdf5 !important; }\n    .bg-slate{ border-left-color:#334155 !important; background:#f8fafc !important; }<\/p>\n<p>    \/* Utilities *\/\n    .tight ul{ margin:0; padding-left:18px; }\n    .tight li{ margin:4px 0; }\n    .mono{ font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }\n    .kbd{ background:#e5e7eb; border:1px solid #cbd5e1; padding:1px 6px; border-radius:6px; font-family:ui-monospace,monospace; font-size:.88em; }\n    .muted{ color:#64748b; }\n    .wp-nodejs-pb code{ background:#f1f5f9; padding:0 4px; border-radius:4px; border:1px solid #e2e8f0; }\n    .wp-nodejs-pb pre{\n      background:#f5f5f5; color:#111827; border:1px solid #e5e7eb;\n      padding:12px; border-radius:8px; overflow:auto; font-size:.92rem; line-height:1.55;\n    }\n    .q{font-weight:700;}<\/p>\n<p>    \/* Make long Q&A easier to scan inside a card *\/\n    .qa p{ margin:8px 0; }\n    .qa b{ color:#0f172a; }\n  <\/style>\n<div class=\"wp-nodejs-pb\">\n<div class=\"heading\">\n<h2>DynamoDB Pocket Book \u2014 Uplatz<\/h2>\n<p>50 deep-dive flashcards \u2022 Wide layout \u2022 Fewer scrolls \u2022 20+ Interview Q&amp;A \u2022 Readable code examples<\/p>\n<\/p><\/div>\n<div class=\"grid\">\n      <!-- ===================== SECTION 1 ===================== --><\/p>\n<div class=\"section-title\">Section 1 \u2014 Fundamentals<\/div>\n<div class=\"card bg-blue\">\n<h3>1) What is DynamoDB?<\/h3>\n<p>Amazon DynamoDB is a fully managed NoSQL database that delivers single-digit millisecond latency at any scale. Key\u2013value &#038; document data models, automatic scaling, and built-in security. Ideal for high-traffic APIs, gaming, IoT, sessions, leaderboards. Pair with analytics engines for ad-hoc queries.<\/p>\n<pre><code class=\"mono\"># AWS CLI: list tables\r\naws dynamodb list-tables<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>2) Why DynamoDB? Strengths &#038; Tradeoffs<\/h3>\n<p>Strengths: serverless, global scale, predictable performance, fine-grained IAM, point-in-time recovery. Tradeoffs: query patterns must be known up front; joins\/aggregations require modeling or ETL. Use GSIs\/LSIs and streams to extend patterns.<\/p>\n<pre><code class=\"mono\"># Create a PAY_PER_REQUEST table\r\naws dynamodb create-table \\\r\n  --table-name Users \\\r\n  --attribute-definitions AttributeName=UserId,AttributeType=S \\\r\n  --key-schema AttributeName=UserId,KeyType=HASH \\\r\n  --billing-mode PAY_PER_REQUEST<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>3) Core Concepts<\/h3>\n<p>Table \u2192 Items \u2192 Attributes. Primary key is required: partition (HASH) and optional sort (RANGE). Items are schemaless per row. Throughput via RCUs\/WCUs (provisioned) or on-demand.<\/p>\n<pre><code class=\"mono\"># Put an item\r\naws dynamodb put-item --table-name Users \\\r\n  --item '{\"UserId\":{\"S\":\"u1\"},\"Name\":{\"S\":\"Aroha\"}}'<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>4) Consistency Models<\/h3>\n<p>By default, reads are eventually consistent (faster\/cheaper). Strongly consistent reads return the latest write in the same Region. Global tables across Regions are eventually consistent.<\/p>\n<pre><code class=\"mono\">aws dynamodb get-item \\\r\n  --table-name Users \\\r\n  --key '{\"UserId\":{\"S\":\"u1\"}}' \\\r\n  --consistent-read<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>5) DynamoDB vs RDBMS<\/h3>\n<p>No joins or multi-item ACID by default (transactions exist but limited). You denormalize and precompute access paths. Use cases with variable schemas and massive scale benefit most.<\/p>\n<pre><code class=\"mono\">-- SQL join vs. Single-table design\r\n-- RDBMS: SELECT u.name, o.total FROM users u JOIN orders o ON ...\r\n-- Dynamo: PK = USER#&lt;id&gt;, SK prefixes: PROFILE#, ORDER#&lt;id&gt;<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>6) Partition Keys &#038; Hotspots<\/h3>\n<p>Partition key determines shard. Avoid skew (e.g., same key hammered). Use high-cardinality keys, write sharding (suffixes), or time buckets to distribute load.<\/p>\n<pre><code class=\"mono\"># Example sharded PK\r\nPK = USER#u1#shard_07, SK = ORDER#2025-08-23#0001<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>7) Secondary Indexes<\/h3>\n<p>GSI: different partition\/sort keys; global capacity. LSI: same partition key, different sort key; created at table creation only. Indexes cost capacity\/storage.<\/p>\n<pre><code class=\"mono\"># Create a GSI (CLI snippet)\r\n--global-secondary-index-updates file:\/\/gsi.json<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange\">\n<h3>8) Billing Modes<\/h3>\n<p>On-demand: pay per request, auto scales. Provisioned: set RCUs\/WCUs, cheaper when steady; add Auto Scaling. Consider reserved capacity for predictable fleets.<\/p>\n<pre><code class=\"mono\">aws dynamodb update-table --table-name Users \\\r\n  --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-indigo\">\n<h3>9) Streams (CDC)<\/h3>\n<p>DynamoDB Streams capture item changes; invoke Lambda for event-driven flows, projections, search indexing, or CQRS read models.<\/p>\n<pre><code class=\"mono\">aws dynamodbstreams list-streams --table-name Users<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-emerald\">\n<h3>10) Q&amp;A \u2014 \u201cWhy is schema design critical?\u201d<\/h3>\n<p><span class=\"q\">Answer:<\/span> Because queries must be key-driven. A good design maps all access patterns to PK\/SK (or GSIs) so reads are constant-time. Poor design leads to table scans and throttling.<\/p>\n<\/p><\/div>\n<p>      <!-- ===================== SECTION 2 ===================== --><\/p>\n<div class=\"section-title\">Section 2 \u2014 Development &#038; APIs<\/div>\n<div class=\"card bg-blue\">\n<h3>11) SDKs<\/h3>\n<p>Use AWS SDKs (boto3, v3 JS SDK, Java, Go). Implement retries with exponential backoff and jitter. Respect service limits and request size caps (400KB per item).<\/p>\n<pre><code class=\"mono\"># Python (boto3)\r\nimport boto3\r\ndb = boto3.client(\"dynamodb\")\r\ndb.get_item(TableName=\"Users\", Key={\"UserId\":{\"S\":\"u1\"}})<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>12) Document Client (Node.js)<\/h3>\n<p>Document clients simplify marshalling JSON to AttributeValues. Prefer v3 modular packages in Node to reduce bundle size.<\/p>\n<pre><code class=\"mono\">import { DynamoDBClient } from \"@aws-sdk\/client-dynamodb\";\r\nimport { GetCommand, DynamoDBDocumentClient } from \"@aws-sdk\/lib-dynamodb\";\r\nconst d = DynamoDBDocumentClient.from(new DynamoDBClient({}));\r\nawait d.send(new GetCommand({ TableName:\"Users\", Key:{ UserId:\"u1\" }}));<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>13) Batch APIs<\/h3>\n<p><code>BatchGetItem<\/code>\/<code>BatchWriteItem<\/code> up to 25 items per call. Handle unprocessed items; they must be retried. Respect per-partition limits to avoid throttling.<\/p>\n<pre><code class=\"mono\">aws dynamodb batch-write-item --request-items file:\/\/batch.json<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>14) Transactions<\/h3>\n<p>ACID across multiple items\/tables with <code>TransactWriteItems<\/code>\/<code>TransactGetItems<\/code>. Limits: 25 items, 4 MB per txn, conditional checks recommended.<\/p>\n<pre><code class=\"mono\">aws dynamodb transact-write-items --transact-items file:\/\/tx.json<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>15) Query vs Scan<\/h3>\n<p>Query is key-only and efficient; Scan reads everything (costly). Model to use Query. Use filters sparingly\u2014they still read items.<\/p>\n<pre><code class=\"mono\">aws dynamodb query --table-name Users \\\r\n  --key-condition-expression \"UserId=:u\" \\\r\n  --expression-attribute-values '{\":u\":{\"S\":\"u1\"}}'<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>16) Pagination<\/h3>\n<p>Use <code>LastEvaluatedKey<\/code> and <code>ExclusiveStartKey<\/code> to iterate. Present cursors to clients; avoid offset-based pagination.<\/p>\n<pre><code class=\"mono\">let startKey;\r\ndo {\r\n  const r = await d.send(new QueryCommand({ ExclusiveStartKey:startKey, ... }));\r\n  startKey = r.LastEvaluatedKey;\r\n} while (startKey);<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>17) Expressions<\/h3>\n<p>Avoid reserved words with <code>ExpressionAttributeNames<\/code>. Build safe updates with <code>SET<\/code>, <code>ADD<\/code>, <code>REMOVE<\/code>, <code>DELETE<\/code> operations.<\/p>\n<pre><code class=\"mono\">UpdateExpression: \"SET #n = :v\",\r\nExpressionAttributeNames: {\"#n\":\"Name\"},\r\nExpressionAttributeValues: {\":v\":\"Hemi\"}<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange\">\n<h3>18) TTL (Time-to-Live)<\/h3>\n<p>Auto-expire items by epoch timestamp on a TTL attribute. Deletions are eventually consistent; not suitable for hard deadlines.<\/p>\n<pre><code class=\"mono\">aws dynamodb update-time-to-live \\\r\n  --table-name Sessions \\\r\n  --time-to-live-specification \"Enabled=true,AttributeName=expiresAt\"<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-indigo\">\n<h3>19) DAX (DynamoDB Accelerator)<\/h3>\n<p>Managed, in-memory cache fronting DynamoDB. Microsecond read latency. Drop-in SDKs exist. Best for read-heavy, repeatedly accessed keys.<\/p>\n<pre><code class=\"mono\">aws dax create-cluster --cluster-name MyDAX --node-type dax.t3.small --replication-factor 3<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-emerald\">\n<h3>20) Q&amp;A \u2014 \u201cQuery or Scan for analytics?\u201d<\/h3>\n<p><span class=\"q\">Answer:<\/span> Neither\u2014export to S3 (TTL\/streams\/Data Pipeline\/Glue) and analyze with Athena\/EMR\/Redshift. Dynamo is for OLTP, not ad-hoc analytics.<\/p>\n<\/p><\/div>\n<p>      <!-- ===================== SECTION 3 ===================== --><\/p>\n<div class=\"section-title\">Section 3 \u2014 Data Modeling, Patterns &#038; Concurrency<\/div>\n<div class=\"card bg-blue\">\n<h3>21) Single-Table Design<\/h3>\n<p>Store multiple entity types in one table; encode entity type in PK\/SK prefixes (e.g., <code>USER#<\/code>, <code>ORDER#<\/code>). Enables cross-entity queries with a single request.<\/p>\n<pre><code class=\"mono\">PK = USER#&lt;id&gt;, SK = PROFILE#\r\nPK = USER#&lt;id&gt;, SK = ORDER#&lt;orderId&gt;<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>22) Composite Keys<\/h3>\n<p>Use sort keys for time-ordering and ranges (<code>BETWEEN<\/code>, <code>begins_with<\/code>). Prefer ISO timestamps or yyyymmdd for lexicographic order.<\/p>\n<pre><code class=\"mono\">-- Get last 30 days of orders\r\nSK BETWEEN \"ORDER#20250725\" AND \"ORDER#20250823\"<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>23) GSIs for Alternate Access<\/h3>\n<p>When you need to query by email or status, project attributes to a GSI keyed on those attributes. Choose <code>ALL<\/code>, <code>KEYS_ONLY<\/code>, or <code>INCLUDE<\/code> projection types.<\/p>\n<pre><code class=\"mono\">GSI1PK = EMAIL#&lt;addr&gt;, GSI1SK = USER#&lt;id&gt;<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>24) Sparse Indexes<\/h3>\n<p>Populate GSI PK\/SK only on items requiring that access. Index remains \u201csparse\u201d and efficient for targeted queries (e.g., <code>STATUS#PENDING<\/code>).<\/p>\n<pre><code class=\"mono\">-- Only pending orders set GSI2PK = STATUS#PENDING<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>25) Adjacency Lists<\/h3>\n<p>Model relationships by writing multiple items per relation: <code>PK=USER#A, SK=FRIEND#B<\/code> and reciprocal if needed. Query neighbors quickly by PK.<\/p>\n<pre><code class=\"mono\">PK = USER#u1, SK = FRIEND#u2<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>26) Materialized Aggregates<\/h3>\n<p>Precompute counts\/summaries in items updated via Streams\/Lambda (CQRS). Reads become O(1); ensure idempotency and conflict handling.<\/p>\n<pre><code class=\"mono\">PK=USER#u1, SK=STATS#orders_count<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>27) Conditional Writes<\/h3>\n<p>Use <code>ConditionExpression<\/code> to enforce invariants (optimistic concurrency). Prevent overwrites or ensure attribute existence\/nonexistence.<\/p>\n<pre><code class=\"mono\">ConditionExpression: \"attribute_not_exists(#v)\",\r\nExpressionAttributeNames: {\"#v\":\"Version\"}<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange\">\n<h3>28) Versioning &#038; OCC<\/h3>\n<p>Store a numeric <code>version<\/code>. Update with <code>SET version = version + 1<\/code> only if current version matches. Retry on conflict.<\/p>\n<pre><code class=\"mono\">ConditionExpression: \"version = :cur\"<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-indigo\">\n<h3>29) Idempotency Keys<\/h3>\n<p>Write operations with client-generated idempotency keys stored in a dedicated item prevent duplicates on retries.<\/p>\n<pre><code class=\"mono\">PK = IDEMPOTENCY#&lt;key&gt;, SK=REQUEST#, status=APPLIED<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-emerald\">\n<h3>30) Q&amp;A \u2014 \u201cWhen add a GSI vs new table?\u201d<\/h3>\n<p><span class=\"q\">Answer:<\/span> Add a GSI if the data is the same logical dataset and you just need another access path. Create a new table if lifecycle, throughput isolation, or ownership boundaries differ materially.<\/p>\n<\/p><\/div>\n<p>      <!-- ===================== SECTION 4 ===================== --><\/p>\n<div class=\"section-title\">Section 4 \u2014 Integrations, Analytics &#038; Global<\/div>\n<div class=\"card bg-blue\">\n<h3>31) Global Tables<\/h3>\n<p>Multi-Region active\u2013active replication. Low-latency local reads\/writes; conflicts resolved by last-writer-wins (timestamp). Beware write conflicts; design for commutativity.<\/p>\n<pre><code class=\"mono\">aws dynamodb update-table --table-name Users \\\r\n  --replica-updates '[{\"Create\":{\"RegionName\":\"ap-southeast-2\"}}]'<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>32) S3 Export\/Import<\/h3>\n<p>Export table\/point-in-time snapshot to S3 parquet without impacting performance. Import from S3 to seed data or migrate.<\/p>\n<pre><code class=\"mono\">aws dynamodb export-table-to-point-in-time \\\r\n  --table-arn arn:aws:dynamodb:...:table\/Users --s3-bucket my-bucket<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>33) Kinesis &#038; Event-Driven<\/h3>\n<p>Fan out streams to Kinesis for near-real-time analytics or to Lambda for projections. Use DLQs and retries with backoff.<\/p>\n<pre><code class=\"mono\"># Lambda trigger from DynamoDB Stream (Console\/IaC)<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>34) Search with OpenSearch<\/h3>\n<p>Project selected fields to OpenSearch\/Elasticsearch via Streams+Lambda for full-text queries. Store doc IDs as Dynamo keys to maintain referential integrity.<\/p>\n<pre><code class=\"mono\">_id = \"USER#u1\", fields: name, bio, tags<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>35) Caching Layers<\/h3>\n<p>In-memory LRU in app, Redis edge cache, DAX for Dynamo specific. Cache hot keys, use TTLs, and add cache-busting on writes.<\/p>\n<pre><code class=\"mono\"># Pseudocode\r\nif (cache.has(key)) return cache.get(key)\r\nval = dynamo.get(key); cache.set(key, val, 60)<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>36) Step Functions &#038; Sagas<\/h3>\n<p>Use Step Functions to coordinate multi-step writes\/compensation across tables\/services. Persist saga state in Dynamo with idempotent tasks.<\/p>\n<pre><code class=\"mono\">State = { sagaId, step, status, updatedAt }<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>37) GraphQL with AppSync<\/h3>\n<p>AppSync integrates resolvers directly with DynamoDB. Use <code>$util<\/code> VTL or JS resolvers; add pipeline resolvers for auth\/validation and batch operations.<\/p>\n<pre><code class=\"mono\"># Key resolver: Query getUser(UserId: ID!): User<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange\">\n<h3>38) Time-Series Data<\/h3>\n<p>Model time-series with composite keys and time buckets (daily\/monthly). Periodically archive old buckets to S3 via TTL + Streams.<\/p>\n<pre><code class=\"mono\">PK = SENSOR#&lt;id&gt;, SK = TS#2025-08-23T12:00:00Z<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-indigo\">\n<h3>39) Multi-Tenancy<\/h3>\n<p>Tenant-aware PK prefix (e.g., <code>TENANT#id<\/code>) enforces logical isolation. Combine with IAM condition keys (<code>dynamodb:LeadingKeys<\/code>) to restrict access per tenant.<\/p>\n<pre><code class=\"mono\">PK = TENANT#t1#USER#u1<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-emerald\">\n<h3>40) Q&amp;A \u2014 \u201cHow to do aggregations?\u201d<\/h3>\n<p><span class=\"q\">Answer:<\/span> Precompute and store aggregates (materialized views) updated by Streams, or export to analytics systems. DynamoDB doesn\u2019t natively aggregate across items.<\/p>\n<\/p><\/div>\n<p>      <!-- ===================== SECTION 5 ===================== --><\/p>\n<div class=\"section-title\">Section 5 \u2014 Security, Ops, Cost, Testing, Interview Q&amp;A<\/div>\n<div class=\"card bg-blue\">\n<h3>41) Security Fundamentals<\/h3>\n<p>Use IAM least privilege with condition keys (partition prefix scoping). Encrypt at rest (KMS) and in transit (TLS). Deny by default; audit with CloudTrail.<\/p>\n<pre><code class=\"mono\">Condition:\r\n  \"ForAllValues:StringLike\": { \"dynamodb:LeadingKeys\": [\"TENANT#t1*\"] }<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>42) Backup &#038; PITR<\/h3>\n<p>Enable Point-In-Time Recovery for continuous backups (last 35 days). Use on-demand backups for long-term retention &#038; compliance.<\/p>\n<pre><code class=\"mono\">aws dynamodb update-continuous-backups \\\r\n  --table-name Users --point-in-time-recovery-specification PointInTimeRecoveryEnabled=true<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>43) Cost Optimization<\/h3>\n<p>Prefer keys over scans, compress large attributes, project only needed fields to GSIs, consolidate hot entities, and leverage on-demand for spiky workloads. Monitor using Cost Explorer and CloudWatch.<\/p>\n<pre><code class=\"mono\"># Avoid KEYS_ONLY if you always need attributes (extra fetches)<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>44) Throttling &#038; Timeouts<\/h3>\n<p>Handle <code>ProvisionedThroughputExceededException<\/code> with retries and backoff. Bound client timeouts; surface metrics. Consider adaptive retry strategies.<\/p>\n<pre><code class=\"mono\">maxRetries=8, backoff=exponential+jitter<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>45) Observability<\/h3>\n<p>Emit structured logs with request IDs, track <code>ConsumedCapacity<\/code>, monitor <code>ThrottledRequests<\/code>, <code>Read\/WriteThrottleEvents<\/code>, and p99 latencies. Add app-level metrics per access pattern.<\/p>\n<pre><code class=\"mono\">ReturnConsumedCapacity: \"TOTAL\"<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>46) Testing Strategy<\/h3>\n<p>Use local emulators (DynamoDB Local) for fast tests, then integration tests in a sandbox AWS account. Seed data with fixtures; test conditional writes and retries.<\/p>\n<pre><code class=\"mono\">docker run -p 8000:8000 amazon\/dynamodb-local<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>47) Migrations &#038; Data Changes<\/h3>\n<p>No schema migrations like SQL; evolve via backfills, dual-writes, or on-read transforms. Keep write paths idempotent during transitions.<\/p>\n<pre><code class=\"mono\">phase1: write v1+v2; phase2: backfill; phase3: read v2; phase4: stop v1<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange tight\">\n<h3>48) Prod Checklist<\/h3>\n<ul>\n<li>Access patterns mapped to PK\/SK and GSIs<\/li>\n<li>TTL for ephemeral data &#038; exports to S3<\/li>\n<li>PITR\/backups enabled; restore tested<\/li>\n<li>Retries\/backoff + idempotency keys<\/li>\n<li>Dashboards for capacity, throttles, latency<\/li>\n<li>Least-privilege IAM with tenant scoping<\/li>\n<\/ul><\/div>\n<div class=\"card bg-indigo\">\n<h3>49) Common Pitfalls<\/h3>\n<p>Relying on scans, low-cardinality PKs, oversized items (&gt;400KB), over-projecting GSIs, ignoring hot partitions, and skipping conditional writes. Prevent with reviews, load tests, and observability.<\/p>\n<\/p><\/div>\n<div class=\"card bg-emerald qa\">\n<h3>50) Interview Q&amp;A \u2014 20 Practical Questions (Expanded)<\/h3>\n<p><b>1) Why DynamoDB over RDS for a social feed?<\/b> Predictable low-latency, scale, and single-table access patterns map well to timelines and denormalized aggregates.<\/p>\n<p><b>2) Define partition &amp; sort keys.<\/b> Partition key routes data to a shard; sort key orders items within a partition, enabling range queries.<\/p>\n<p><b>3) GSI vs LSI?<\/b> GSI uses alternate partition\/sort keys and independent capacity; LSI shares partition key, created with table only.<\/p>\n<p><b>4) Prevent lost updates?<\/b> Conditional writes with a version attribute (OCC) and retries.<\/p>\n<p><b>5) Hot partition \u2014 symptoms &#038; fixes?<\/b> Throttling on specific PK; shard keys, add random suffixes, or redesign access.<\/p>\n<p><b>6) Why single-table design?<\/b> Minimizes joins and network calls, enabling O(1) access for related entities via key prefixes.<\/p>\n<p><b>7) When use transactions?<\/b> Cross-item invariants (deduct balance + write order) that must succeed or fail together.<\/p>\n<p><b>8) Query filtering gotcha?<\/b> FilterExpression still reads all matched keys; costs capacity. Prefer key conditions.<\/p>\n<p><b>9) TTL caveat?<\/b> Deletion is eventual; don\u2019t rely for precise expiry moments.<\/p>\n<p><b>10) Item size limits?<\/b> 400KB including attribute names. Store blobs in S3 and reference via URL.<\/p>\n<p><b>11) Strong reads across Regions?<\/b> Not supported\u2014global tables are eventually consistent.<\/p>\n<p><b>12) Write idempotency?<\/b> Use idempotency keys stored in a guard item and conditional writes.<\/p>\n<p><b>13) Cost drivers?<\/b> RCUs\/WCUs consumed, GSI projections, data transfer, storage. Design to minimize reads\/writes.<\/p>\n<p><b>14) Modeling many-to-many?<\/b> Adjacency items per relation + GSIs for reverse lookups.<\/p>\n<p><b>15) Fan-out reads?<\/b> Store timeline per user partition; write-time fan-out via Streams\/Lambda.<\/p>\n<p><b>16) How to paginate?<\/b> Use <code>LastEvaluatedKey<\/code> cursors; never offset\/limit.<\/p>\n<p><b>17) Backups vs PITR?<\/b> PITR for rolling window recovery; on-demand backups for long-term archival\/compliance.<\/p>\n<p><b>18) IAM tenant isolation?<\/b> <code>dynamodb:LeadingKeys<\/code> conditions to restrict PK prefixes per tenant identity.<\/p>\n<p><b>19) Handling spikes?<\/b> Use on-demand or Auto Scaling, pre-warm partitions with diverse keys, DAX for read bursts.<\/p>\n<p><b>20) Observability must-haves?<\/b> ConsumedCapacity, throttle counts, latency histograms, and per-pattern dashboards + alarms.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>DynamoDB Pocket Book \u2014 Uplatz 50 deep-dive flashcards \u2022 Wide layout \u2022 Fewer scrolls \u2022 20+ Interview Q&amp;A \u2022 Readable code examples Section 1 \u2014 Fundamentals 1) What is DynamoDB? <span class=\"readmore\"><a href=\"https:\/\/uplatz.com\/blog\/dynamodb-pocket-book\/\">Read More &#8230;<\/a><\/span><\/p>\n","protected":false},"author":2,"featured_media":4848,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2514,2462],"tags":[],"class_list":["post-4747","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dynamodb","category-pocket-book"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DynamoDB Pocket Book | Uplatz Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uplatz.com\/blog\/dynamodb-pocket-book\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DynamoDB Pocket Book | Uplatz Blog\" \/>\n<meta property=\"og:description\" content=\"DynamoDB Pocket Book \u2014 Uplatz 50 deep-dive flashcards \u2022 Wide layout \u2022 Fewer scrolls \u2022 20+ Interview Q&amp;A \u2022 Readable code examples Section 1 \u2014 Fundamentals 1) What is DynamoDB? 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