Tablespaces error

If you are trying to dump a database in a mysql instance running inside a docker container and you get the following error, despite logging in as a user who has read permission on it, it means that the user you are using does not have the required PROCESS privilege to perform certain tasks during the database dump. This is common when attempting to dump information such as tablespaces, which may require elevated permissions.

mysqldump: Error: 'Access denied; you need (at least one of) the PROCESS privilege(s) for this operation' when trying to dump tablespaces

fix with:

mysqldump -u <username> -p --no-tablespaces <database_name> > dump.sql


The --no-tablespaces option in mysqldump prevents the tool from including tablespace information in the dump.
Details:
  1. Tablespace Information:
    • MySQL uses tablespaces to store table data on disk, especially when dealing with InnoDB tables.
    • When dumping a database, mysqldump by default tries to include metadata related to tablespaces, such as where and how data files are stored.
  2. Why it Fails Without Privileges:
    • Accessing tablespace information requires elevated privileges, such as the PROCESS or SUPER privilege, because this data involves system-level information.
  3. Effect of --no-tablespaces:
    • By specifying --no-tablespaces, you instruct mysqldump to skip exporting any tablespace metadata.
    • This avoids triggering errors when the user lacks the necessary privileges to query tablespace information.
    • The dumped SQL file will still include all table data and schema definitions, but it will omit references to tablespaces.

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