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MySQL 8 Cookbook

You're reading from MySQL 8 Cookbook Over 150 recipes for high-performance database querying and administration

Product type Paperback

Published in Jan 2018

Publisher

ISBN-13 9781788395809

Length 446 pages

Edition 1st Edition

Tools

MySQL

Concepts

Database Administration

Author (1):

Karthik Appigatla

View More author details

Table of Contents (15) Chapters

Preface

1. MySQL 8 - Installing and Upgrading FREE CHAPTER

2. Using MySQL

3. Using MySQL (Advanced)

4. Configuring MySQL

5. Transactions

6. Binary Logging

7. Backups

8. Restoring Data

9. Replication

10. Table Maintenance

11. Managing Tablespace

12. Managing Logs

13. Performance Tuning

14. Security

Managing UNDO tablespace

You can manage the size of an UNDO tablespace through the dynamic variable innodb_max_undo_log_size, which is 1 GB by default, and the number of UNDO tablespaces through innodb_undo_tablespaces, which is 2 GB by default and dynamic from MySQL 8.0.2.

By default, innodb_undo_log_truncate is enabled. Tablespaces that exceed the threshold value defined by innodb_max_undo_log_size are marked for truncation. Only undo tablespaces can be truncated. Truncating undo logs that reside in the system tablespace is not supported. For truncation to occur, there must be at least two undo tablespaces.

How to do it...

Verify the size of the UNDO logs:

shell> sudo ls -lhtr /var/lib/mysql/undo_00*
-rw-r--...

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Authors (1)

Karthik Appigatla

Karthik Appigatla

Karthik Appigatla is a highly reputed database architect and is very famous for performance tuning. He has been consulted by many companies all over the world for designing, performance tuning, building database infrastructure, and training. In his decade of experience, he has worked for companies such as Yahoo, Pythian, and Percona. Currently, he is working for LinkedIn, where he has innovated a new way of analyzing queries. He gave a talk about this at SRECon, Dublin in 2017.

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