Preface Part I.Design Patterns 1.To EmbedOrReference Relational Data Modeling and Normalization What Is a Normal Form，Anyway? So What's the Problem? Denormalizing for Performance MongoDB：Wh0 Needs Normalization.Anyway? MongoDB Document Format Embedding for Locality Embedding for Atomicity and Isolation Referencing for Flexibilitv Referencing for Potentially High--Arity Relationships Many-to-Many Relationships Conclusion 2.PolymorphicSchemas Polymorphic Schemas to SuppoObjectOriented Programming Polymorphic Schemas Enable Schema Evolution Storage(In-)Efficiency ofBSON Polymorphic Schemas SuppoSemiStructured Domain Data Conclusion 3.MimickingTransactional Behavior The Relational Approach to Consistency Compound Documents Using Complex Updates Optimistic Update with Compensation Conclusion Partll.UseCases 4.OperationalIntelligence Storing Log Data Solution 0verview Schema Design Operations Sharding Concerns Managing Event Data Growth PreAggregated Reports Solution 0verview Schema Design Operations Sharding Concerns Hierarchical Aggregation Solution Overview Schema Design MapReduce Operations Sharding Concerns 5.Ecommetce Product Catalog Solution Overview Operations Sharding Concerns Category Hierarchy Solution Overview Schema Design Operations Sharding Concerns Inventory Management Solution 0verview Schema Operations Sharding Concerns 6.ContentManagementSystems Metadata and Asset Management Solution Overview Schema Design Operations Sharding Concerns Storing Comments Solution 0verview Approach：One Document per Comment Approach：Embedding All Comments Approach：Hybrid Schema Design Sharding Concerns 7.OnlineAdvertising Networks Solution Overview Design 1：Basic Ad Serving Schema Design Operation：Choose an Ad to Serve Operation：Make an Ad Campaign Inactive Sharding Concerns Design 2：Adding Frequency Capping Schema Design Operation：Choose an Ad to Serve Sharding Design 3：Keyword Targeting Schema Design Operation：Choose a Group ofAds to Serve 8.SociaI Networking Solution Overview Schema Design Independent Collections Dependent Collections Operations Viewing a News Feed or WaU Posts Commenting on a Post Creating a New Post Maintaining the Social Graph Sharding 9.OnlineGaminq. Solution Overview Schema Design Character Schema Rem Schema Locion Schema Operations Load Character Data from MongoDB Extract Armor and Weapon Data for Display Extract Character Attributes，Inventorand Room Information for Display PickUp anItemfrom aRoom Remove an Item from a Container Move the Character to a Different Room Buy an Item Sharding Afterword Index