Contents
How does MySQL store metadata?
Storing metadata of various data types in a MySQL database
- Create a separate table for storing each data type (ex.
- Have a single table for storing the values of all metadata, but have a different column for each data type and only use the column specific to that metadata field to store the actual data.
Where is metadata stored in a database?
Where the metadata relates to databases, the data is often stored in tables and fields within the database. Sometimes the metadata exists in a specialist document or database designed to store such data, called a data dictionary or metadata repository.
What are the different data types in MySQL?
In MySQL there are three main data types: string, numeric, and date and time.
What is Information_schema MySQL?
INFORMATION_SCHEMA provides access to database metadata, information about the MySQL server such as the name of a database or table, the data type of a column, or access privileges. Other terms that are sometimes used for this information are data dictionary and system catalog.
What are the data type storage requirements in MySQL?
Numeric Type Storage Requirements Data Type Storage Required TINYINT 1 byte SMALLINT 2 bytes MEDIUMINT 3 bytes INT , INTEGER 4 bytes
Is the storage for year and date the same in MySQL?
As of MySQL 5.6.4, storage for YEAR and DATE remains unchanged. However, TIME , DATETIME, and TIMESTAMP are represented differently.
What are the storage requirements for table data?
The storage requirements for table data on disk depend on several factors. Different storage engines represent data types and store raw data differently. Table data might be compressed, either for a column or an entire row, complicating the calculation of storage requirements for a table or column.
What’s the difference between MySQL 5.6.4 and 5.7?
For TIME , DATETIME, and TIMESTAMP columns, the storage required for tables created before MySQL 5.6.4 differs from tables created from 5.6.4 on. This is due to a change in 5.6.4 that permits these types to have a fractional part, which requires from 0 to 3 bytes. As of MySQL 5.6.4, storage for YEAR and DATE remains unchanged.