Why Are My MySQL Table Names Case-Sensitive on One System But Not Another?

MySQL Table Name Case Sensitivity

This question has been brought up by a developer who had differing table name casing on two different environments. On their Windows development machine, all tables were lowercase, while on the Ubuntu test server, table names appeared with an uppercase starting letter.

In most cases, the difference in case sensitivity is due to the operating system, not MySQL itself.

Role of Operating System:

In general, database and table names are not case-sensitive in Windows, but are case-sensitive in most versions of Unix. In MySQL, databases correspond to directories within the data directory, and tables within a database correspond to files within the database directory. Thus, the case sensitivity of the underlying operating system affects the case sensitivity of database and table names.

Configuration Option:

MySQL provides a configuration option, lower_case_table_names, that allows you to control how table names are stored on the disk. This option can be set to:

• 0 (default): Table names are stored in the case specified in the CREATE TABLE statement.
• 1: Table names are converted to lowercase on disk.
• 2: Table names are converted to uppercase on disk.

By setting lower_case_table_names appropriately, you can control the case sensitivity of table names regardless of the operating system. For more details, refer to the MySQL documentation on [Identifier Case Sensitivity](https://dev.mysql.com/doc/refman/8.0/en/identifier-case-sensitivity.html).

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