What is the difference between VARCHAR and CHAR data types in DB2?

What is the difference between VARCHAR and CHAR data types in DB2?

CHAR and VARCHAR are both data types used to store character strings in DB2, but they have some key differences:

• Storage: CHAR data type stores fixed-length strings where the length is specified during table creation. VARCHAR, on the other hand, stores variable-length strings where the length can vary up to the specified maximum length.
• Performance: CHAR data type is generally faster for retrieval and processing as the data is stored in a fixed length. VARCHAR may have slightly slower performance due to variable length storage.
• Space Efficiency: VARCHAR is more space-efficient for storing variable-length strings as it only uses as much space as needed. CHAR, on the other hand, will always use the specified fixed length, even if the string is shorter.
• Character Limit: In DB2, CHAR can store up to 254 characters per column, while VARCHAR can store up to 32672 characters per column.

In summary, CHAR is ideal for fixed-length strings where the length is known and constant, while VARCHAR is better for variable-length strings to save space and allow for flexibility in data storage.