The new transactional data dictionary in MySQL 8.0 is an incredible addition that opens the door to many future improvements in how MySQL handles DDLs, for example.
In this chapter, you have learned about the new structure of the data dictionary, with its improvements and its different uses and limitations. We must not forget that a new feature has been incorporated, called SDI, allowing for more openings toward new flexible and powerful options.
In the next chapter, we will cover all the following points by getting started with the most significant variables. We will then look at MySQL server optimization. We will discuss two important variables and introduce two case studies.