This article explains the role of DNS as the hidden navigator that maps human‑readable domain names to IP addresses, details the four‑layer caching hierarchy, walks through recursive and iterative query flows, outlines common DNS failures, and offers practical troubleshooting and performance‑boosting tips.
This article explains the DNS protocol, detailing how domain names are resolved to IP addresses through browser caching, OS queries, recursive lookups involving root, TLD, and authoritative servers, and outlines practical configuration steps for forward, reverse, and high‑availability DNS setups.
This article explains what the Domain Name System (DNS) is, describes the three main DNS query types—recursive, iterative, and non‑recursive—and walks through the eight detailed steps a DNS lookup follows to resolve a domain name to an IP address.
This article explains MySQL recursive queries using WITH RECURSIVE, detailing their structure, execution process, common use cases, and provides a step‑by‑step example with table creation, data insertion, and a paginated hierarchical query.
An in‑depth guide walks through the fundamentals of the Domain Name System, explaining its role as a distributed hierarchical database, the functions of root, TLD, authoritative and local DNS servers, the recursive and iterative query processes, caching mechanisms, and practical interview insights.
DNS (Domain Name System) acts as a 'translator' between human-readable domain names and machine-readable IP addresses, enabling internet communication through a hierarchical distributed system of servers.
This article explains how MySQL's LATERAL join and recursive CTE can be used to compute the number of direct and indirect reports for each employee, demonstrating lateral external references, non‑lateral references, query execution details, and EXPLAIN output in MySQL 8.0.14 and later.
The article details the ITPUB "Shengtou Media Cup" SQL contest, presenting two Oracle‑based Tic‑Tac‑Toe problems—one to list every possible terminal game sequence and insert it into a table, and another to compute forced wins from any valid board—along with solution approaches and extra challenges.
