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Technical exploration and thoughts · 655 articles
MongoDB Use Cases & Selection Guide
MongoDB is suitable for website data storage, caching systems, big data analysis, IoT, social media, live streaming platforms and more. Not suitable for scenarios requiring complex transactions and...
Spring Boot MongoDB: Template vs Repository with Index Tips
Two ways to connect Spring Boot to MongoDB: MongoTemplate and MongoRepository, with complete Java code examples and common problem troubleshooting.
Java MongoDB CRUD: Complete Guide from Setup to Operations
Complete guide to accessing MongoDB with Java, including environment setup, Maven dependencies, connection, CRUD operations, POJO mapping, index management, aggregation queries and transaction hand...
MongoDB Slow Query Analysis & Index Tuning
MongoDB slow query analysis through built-in Profiler, set db.setProfilingLevel(1, m) to record slow queries. EXPLAIN analysis helps identify performance bottlenecks and optimize queries.
MongoDB Storage Engines: WiredTiger vs InMemory Comparison
Comparison of MongoDB's two main storage engines WiredTiger and InMemory, including configuration methods and verification steps. WiredTiger recommended for production environments.
MongoDB Replica Set Containerization: Keyfile + Auth Quic...
MongoDB 7 replica set containerization best practices: generate keyfile, explicitly enable --auth, use one-time container for rs.initiate and admin user creation.
MongoDB Replica Set Deployment: Single Machine Three Inst...
MongoDB replica set single machine three instance deployment guide including configuration, initialization, adding/removing nodes, elections, read-write separation and rollback operations.
MongoDB Data Modeling: Embedded vs Reference Selection Guide
MongoDB data modeling choice between embedded and reference, following three principles: embed for 1:few, use reference for unbounded growth, use $lookup+index for cross-collection association. Wir...
MongoDB Replica Set: oplog, Heartbeat & Elections Explained
MongoDB replica set concepts: oplog location and idempotency, heartbeat frequency and election timeout, member/voting limits (50/7). Note that master-slave replication was removed since 4.0.
MongoDB Production Security Hardening: Auth, RBAC & TLS
MongoDB production environment security hardening guide including authentication, RBAC minimum privileges, internal network bindIp/firewall ACL, TLS/SSL encryption.
MongoDB Sharding: Shard, Config Server, Mongos Complete G...
MongoDB sharded cluster detailed explanation: sharding consists of Shard, Config Server, Mongos. Shard key selection includes range sharding, hashed sharding, zone sharding. Includes minimal runnab...
MongoDB Auth & Permissions: Single Instance to Sharded Cl...
MongoDB authentication and permission configuration from single instance to sharded cluster. Implementation order: create admin/root first → enable authorization → assign permissions by database.
MongoDB Sharded Cluster Deployment: Complete Guide with S...
Step-by-step MongoDB sharded cluster setup (configsvr×3 + two shard replica sets×3 nodes + multiple mongos), including configuration, initialization, adding shards, balancing and rollback.
Neo4j Graph Theory: Euler Path & Circuit with Python Netw...
Euler path/circuit determination: undirected graphs check connectivity and odd-degree vertices, directed graphs check weak connectivity and in/out-degree balance. Includes Python NetworkX minimal r...
MySQL Transaction Isolation Levels: Read Uncommitted to S...
This article provides an in-depth explanation of MySQL transaction isolation levels: Read Uncommitted, Read Committed, Repeatable Read, and Serializable, analyzing dirty read, non-repeatable read, ...
How to Build an Offline Data Warehouse: Tracking → Metric...
Complete guide to building offline data warehouses: data tracking, metric system design, theme analysis, and standardization practices for e-commerce teams.
Offline Data Warehouse Architecture Selection and Cluster...
Offline Data Warehouse (Offline DW) overall architecture design and implementation method: Framework selection comparison between Apache community version and...
MyBatis Level 2 Cache Integration with Redis, Testing and...
Detailed introduction to MyBatis level 2 cache integration with Redis for distributed caching across services, including pom configuration, mapper configuration, test code and source code analysis....
Offline Data Warehouse Layering: ODS/DWD/DWS/DIM/ADS Arch...
When implementing an Offline Data Warehouse in an enterprise, the two most common problems are: data silos caused by data mart expansion, and duplicate...
Offline Data Warehouse Modeling Practice
Offline data warehouse modeling practice, covering fact tables, dimension tables, fact types, and snowflake/galaxy models.