MySQL 8.0 Reference Manual  /  MySQL Data Dictionary

Pre-General Availability Draft: 2017-04-25

Chapter 15 MySQL Data Dictionary

MySQL Server now incorporates a transactional data dictionary that stores information about database objects. In previous MySQL releases, dictionary data was stored in metadata files and nontransactional tables.

This chapter describes the main features, benefits, usage differences, and limitations of the data dictionary. For other implications of the data dictionary feature, refer to the Data Dictionary Notes section in the MySQL 8.0.0 Release Notes.

InnoDB continues to use its own data dictionary in the MySQL 8.0.0 release.

Benefits of the MySQL data dictionary include:


A data dictionary-enabled server entails some general operational differences compared to a server that does not have a data dictionary; see Section 15.6, “Data Dictionary Usage Differences”. Also, for upgrades to MySQL 8.0, the upgrade procedure differs somewhat from previous MySQL releases and requires that you verify the upgrade readiness of your installation by checking specific prerequisites. For more information, see Section 2.10.1, “Upgrading MySQL”, particularly Verifying Upgrade Prerequisites for Your MySQL 5.7 Installation.

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