Why Does My MySQL Import Fail with \'Tablespace for table xxx exists\' Even Though the Table Doesn\'t Exist?

Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT

Problem:

Users encounter an error informing them that the tablespace for a particular table exists, prompting them to discard it before attempting to import. However, attempts to drop the table or discard its tablespace result in "unknown table" or "table doesn't exist" errors.

Answer:

The error typically occurs in "innodb_file_per_table" mode when the tablespace becomes full. This can cause the database server to leave orphaned ".ibd" files without their corresponding ".frm" files in the file system.

Solution:

1. Locate the orphaned ".ibd" file by checking the file system where the tables-per-file are stored (usually "/var/lib/mysql" or similar).
2. Move the orphaned ".ibd" file to a safe temporary location (e.g., "/tmp/mysql_orphans").
3. Ensure that any underlying issues causing the tablespace full error have been resolved (e.g., long running queries or locked tables).
4. Retry the operation that initially caused the error.

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