The system variable controls the size of the table cache . . . . . . . .

Solution (By Examveda Team)

This question is about MySQL and how it manages the memory used for storing table data. Let's break down the options:
Option A: table_cache
This is the correct answer! The table_cache system variable directly controls the size of the table cache. Think of it as a temporary storage area where MySQL keeps frequently used table definitions. This helps speed up access to tables because MySQL doesn't need to read them from disk every time.
Option B: cache_table
This is not a valid MySQL system variable.
Option C: open_cache
This option is closely related to table_cache. The open_cache variable controls the number of open tables that MySQL can keep in memory. It's a separate setting that affects how many tables can be loaded at the same time.
Option D: cache_open
This is not a valid MySQL system variable.
In short: The table_cache variable directly controls the size of the memory area used for storing table definitions. This improves the performance of your MySQL database by reducing the need to read data from disk frequently.