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Doublewrite

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Aikesheng Open Source Community

Sep 6, 2022 · Databases

Understanding MySQL Crash Recovery and the Role of Redo Logs

This article explains how MySQL performs crash recovery by using Redo logs, doublewrite buffers, undo tablespace handling, transaction subsystem initialization, and the processing of active, prepared, and committed transactions to restore data pages and ensure consistency after an unexpected shutdown.

Crash RecoveryDoublewriteInnoDB

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Understanding MySQL Crash Recovery and the Role of Redo Logs

YunZhu Net Technology Team

Sep 16, 2021 · Databases

MySQL 8.0 Doublewrite Mechanism Causes LOAD Performance Degradation and How to Fix It

The article explains how MySQL 8.0’s new doublewrite buffer implementation dramatically slows LOAD performance on a 1 GB file, identifies the innodb_doublewrite_pages default setting as the root cause, and shows that increasing it to 64 restores speeds comparable to MySQL 5.7.

DoublewriteInnoDBMySQL

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MySQL 8.0 Doublewrite Mechanism Causes LOAD Performance Degradation and How to Fix It