This article explains how to add undo and redo functionality to a Fabric.js canvas editor by maintaining a history stack, provides full source code, discusses performance considerations, and compares alternative approaches such as the Command Pattern and object‑level diff snapshots.
After publishing 50 installments of the 'MySQL Core Modules' series covering transactions, locks, and undo, the author expresses gratitude to readers and the community, outlines upcoming articles on Undo, MVCC, and Redo, and reviews past content while planning a compiled book.
This article explains the design and implementation of undo and redo functionality in the IoT Studio visual builder, comparing snapshot and command (operation) approaches, detailing transaction handling, a doubly‑linked‑list history manager, and exploring hybrid solutions such as immutable.js and Git‑style diff storage.
This article explains Oracle instance recovery, detailing when it is needed, how checkpoints and SCNs are recorded during clean and abnormal shutdowns, and the step‑by‑step forward‑roll and rollback process performed by SMON to restore database consistency after a crash.
This article explains InnoDB’s double‑write buffer in MySQL, compares its design and recovery handling with Oracle’s redo and control‑file mechanisms, discusses partial‑write issues, checkpoint strategies, performance impacts on SSDs, and provides practical commands and configuration tips for DBAs.
This article explains the internal structures and roles of Oracle undo and redo logs in transaction processing, walks through practical experiments that dissect undo segment headers, undo blocks, undo chains, redo records, fast‑commit behavior, and the true nature of DELETE operations, and shows how these insights help diagnose ORA‑600 startup failures.
