Master MySQL’s Three Logs: Redo, Undo, and Binlog for Data Safety

This article explains how MySQL’s three essential logs—redo, undo, and binlog—work together to guarantee data durability, enable crash recovery, support transaction rollback, and power master‑slave replication, while providing practical configuration tips, monitoring queries, and recovery procedures for production environments.

Binlogdatabase reliabilitymysql

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Master MySQL’s Three Logs: Redo, Undo, and Binlog for Data Safety

dbaplus Community

Oct 29, 2015 · Databases

Why PostgreSQL Keeps Working After the Main Process Crashes

This article explains how PostgreSQL’s process architecture allows existing connections to continue operating and persist data even when the postmaster (main) process crashes, demonstrates the behavior with step‑by‑step experiments, and discusses the limitations and monitoring implications.

Data PersistencePostgreSQLbackend process

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Why PostgreSQL Keeps Working After the Main Process Crashes