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MySQL Server Variable: innodb_doublewrite; The InnoDB Doublewrite Buffer; Innodb_dblwr_pages_written; Innodb_dblwr_writes; (Doc ID 1438677.1)

Last updated on FEBRUARY 27, 2020

Applies to:

MySQL Server - Version 4.0 and later
Information in this document applies to any platform.

Purpose

Understand how the InnoDB doublewrite buffer works and when you should have it enabled.

Scope

Detailed general guidance for DBAs already familiar with the option seeking guidance on how to use it and what problems it can be involved with.

Details

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In this Document
Purpose
Scope
Details
 How to Enable and Disable the Doublewrite Buffer?
 How to Monitor the Doublewrite Buffer?
 How the Doublewrite Buffer Works
 Performance Considerations
 When Can the Doublewrite Buffer be Disabled?
References

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