خرید و دانلود نسخه کامل کتاب Datalevin: The Definitive Guide to Logical and Intelligent Databases

Move beyond SQL’s table-first model and build applications around durable, queryable facts.Modern applications need more than rows and joins. They need transactions, graph relationships, documents, full-text search, vector similarity, and increasingly persistent memory for intelligent systems. Meeting those needs with SQL strings, ORM layers, extensions, and sidecar services creates accidental complexity.Datalevin: The Definitive Guide to Logical and Intelligent Databases presents a different foundation. Datalevin is a compact, open-source database that combines ACID transactions and durable LMDB-backed storage with a fact-first data model and Datalog queries. Relational records, graph edges, documents, search results, vector neighbors, and agent memory become different views over one logical database.In this hands-on guide, you will learn how to:Model application state as entities, attributes, and durable factsWrite composable Datalog queries, rules, recursive queries, transactions, and pull patternsReplace SQL and ORM glue with queries represented as ordinary dataDesign relational, graph, and document models that can evolve cleanlyCombine full-text, vector, embedding, and logical constraints in hybrid queriesTune storage, diagnose query plans, ingest data efficiently, and operate Datalevin in productionBuild persistent agent memory with scoped recall, context assembly, provenance, and truth maintenanceThe book covers the complete path from first principles to production: the Datalevin mental model, core APIs, schema design, indexing, performance, durability, deployment, replication, security, monitoring, and intelligent-system architecture. It also includes reference material for installation, EDN, schemas, Datalog built-ins, and the core, key-value, and client APIs.This guide is for engineers building embedded applications, backend services, knowledge graphs, search-heavy products, durable workflows, or AI systems that need reliable long-term state. Basic database literacy is helpful, but no prior Datalog experience is required.Written by Datalevin’s creator and maintainer, this book shows how to make a logical database the center of modern application state—where facts are stored, relationships are traversed, knowledge is derived, evidence is preserved, and intelligent systems can remember.