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Table of Contents
- 16.1 Data Dictionary Schema
- 16.2 Removal of File-based Metadata Storage
- 16.3 Transactional Storage of Dictionary Data
- 16.4 Dictionary Object Cache
- 16.5 INFORMATION_SCHEMA and Data Dictionary Integration
- 16.6 Serialized Dictionary Information (SDI)
- 16.7 Data Dictionary Usage Differences
- 16.8 Data Dictionary Limitations
MySQL Server incorporates a transactional data dictionary that stores information about database objects. In previous MySQL releases, dictionary data was stored in metadata files, nontransactional tables, and storage engine-specific data dictionaries.
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 theMySQL 9.6 Release Notes.
Benefits of the MySQL data dictionary include:
Simplicity of a centralized data dictionary schema that uniformly stores dictionary data. SeeSection 16.1, “Data Dictionary Schema”.
Removal of file-based metadata storage. SeeSection 16.2, “Removal of File-based Metadata Storage”.
Transactional, crash-safe storage of dictionary data. SeeSection 16.3, “Transactional Storage of Dictionary Data”.
Uniform and centralized caching for dictionary objects. SeeSection 16.4, “Dictionary Object Cache”.
A simpler and improved implementation for some
INFORMATION_SCHEMAtables. SeeSection 16.5, “INFORMATION_SCHEMA and Data Dictionary Integration”.Atomic DDL. SeeSection 15.1.1, “Atomic Data Definition Statement Support”.
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