ClickHouse is a column-oriented database management system (DBMS) designed for Online Analytical Processing (OLAP). Unlike row-oriented databases (MySQL, PostgreSQL) where each row is stored together — efficient for retrieving full records — ClickHouse stores each column separately, making it extremely efficient for aggregation queries that scan specific columns across billions of rows. ClickHouse can process […]
A single Redis instance has two failure modes: if the server goes down, all cached data is lost and every request hits the origin database; and if the dataset grows beyond a single server’s RAM, there’s no built-in way to distribute it. Redis provides two solutions: Redis Sentinel for high availability (automatic failover with a […]
Elasticsearch is a distributed, RESTful search and analytics engine built on Apache Lucene. It stores data as JSON documents in indices and provides near-real-time full-text search, log aggregation, metrics analysis, and complex aggregation queries through a simple HTTP/JSON API. Elasticsearch is the core component of the Elastic Stack (ELK Stack) — Elasticsearch stores and searches […]
PostgreSQL provides two complementary backup tools: pg_dump for logical backups of individual databases (SQL statements that can be restored to any PostgreSQL version) and pg_basebackup for physical backups of the entire database cluster (exact byte-for-byte copy of the data directory, used for streaming replication setup and point-in-time recovery). pg_dump is the right tool for most […]
PostgreSQL Streaming Replication sends WAL (Write-Ahead Log) records from a primary server to one or more standby servers in near-real-time, keeping standbys continuously synchronised with the primary. This provides high availability (automatic or manual failover when the primary fails), read scaling (queries can be distributed to hot standbys), and geographic redundancy. Unlike logical replication which […]
A default MySQL installation has several security weaknesses: a root account that may be accessible remotely, anonymous user accounts, a test database anyone can access, and no audit logging of who accessed what data. Securing MySQL is essential before any production deployment and covers four main areas: access control (who can connect from where), authentication […]
pgAdmin 4 is the official, full-featured web-based administration and development platform for PostgreSQL. It provides a graphical interface for managing databases, schemas, tables, views, functions, roles, and server connections; a SQL query editor with syntax highlighting and query execution plans; a visual schema designer; backup and restore wizards; and monitoring dashboards for server statistics. pgAdmin […]
Regular database backups are non-negotiable for any production system. mysqldump is the standard MySQL/MariaDB logical backup tool — it exports database contents as SQL statements (CREATE TABLE, INSERT) that can be restored on any compatible server. While mysqldump is not the fastest solution for very large databases (where Percona XtraBackup or MySQL Enterprise Backup are […]
MySQL Group Replication extends traditional primary-replica replication with a built-in, distributed consensus protocol (Paxos-based) that provides automatic failover, multi-primary writes, and conflict detection. Unlike standard replication where a manual intervention is needed to promote a replica to primary, Group Replication automatically elects a new primary if the current primary fails — making it the foundation […]
MySQL primary-replica replication (formerly called master-slave) copies data changes from a primary (write) server to one or more replica (read) servers in near-real-time. Replication solves multiple operational problems: distributing read traffic across replicas reduces load on the primary, a replica provides a hot standby for failover if the primary fails, replicas can be used for […]
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