This guide walks through diagnosing a MongoDB outage, explains sharding concepts, shows when to shard, and provides step‑by‑step instructions for configuring config servers, mongos routers, converting replica sets, sharding collections, tracking chunks, and managing the balancer.
This article explains core cluster concepts, the benefits of building database clusters, classifies common cluster types, and compares scalable architectures such as Oracle RAC, MySQL Cluster, sharding, CAP/BASE theory, and cross‑database transaction strategies for high availability and performance.
This article investigates how the MySQL 8.0 group_replication_member_expel_timeout parameter influences node expulsion in a group replication cluster when network latency is introduced, describing the test environment, methodology, commands, observations, and configuration recommendations.
This step‑by‑step tutorial shows how to set up a highly available MongoDB cluster with sharding and replica sets on Ubuntu 18.04, covering key concepts, environment preparation, configuration of config servers, shard replica sets, the mongos router, enabling sharding, testing data distribution, and final deployment tips.
This tutorial walks you through preparing the environment, configuring cluster components, installing required packages, setting up Python 3.7, running pre‑install checks, executing the GaussDB installation script, handling common errors, and finally uninstalling the cluster on a CentOS 7.5 system.
This tutorial explains the principles of MySQL Group Replication, compares single‑primary and multi‑primary modes, lists its key features and limitations, and provides a complete, code‑rich walkthrough for setting up a three‑node MGR cluster on MySQL 5.7.17.
This article provides a comprehensive, step‑by‑step tutorial on setting up MySQL master‑slave replication, covering basic principles, configuration of master and slave servers, recommended hardware, scaling to multiple slaves, and the key limitations of the architecture.
PhxSQL is an open‑source, MySQL‑compatible relational database cluster that provides high availability and strong data consistency through a single‑master multi‑slave architecture, automatically switching masters when over half the nodes are alive, without relying on external services like Zookeeper, and requiring no code changes for migration.
