我太太是搞這個的
-
Identifier Length Limits:
- MySQL imposes a maximum length for identifiers (such as table names, column names, and index names). In MySQL 8.0, the limit is 64 characters1.
-
Grant Table Scope Column Properties:
- The grant table in MySQL controls user privileges. It has specific column properties, and understanding these is crucial for managing user access and permissions1.
-
Limits on Number of Databases and Tables:
- MySQL does not impose a fixed limit on the number of databases or tables you can create. However, practical considerations like available system resources and performance may affect the actual number of databases and tables you can effectively manage1.
-
Limits on Table Size:
- The storage engine used affects the maximum table size. For example:
- MyISAM permits data and index files to grow up to 256TB by default, but this limit can be changed to a maximum permissible size of 65,536TB (2567 - 1 bytes)2.
- InnoDB has different limits based on the file format and page size. For example, the maximum table size for InnoDB with a 16KB page size is approximately 64TB1.
- The storage engine used affects the maximum table size. For example:
-
Limits on Table Column Count and Row Size:
- The number of columns in a table and the maximum row size depend on the storage engine and other factors. For instance, InnoDB has a maximum row size of approximately 8,000 bytes1.
