InnoDB: Error: Attempted to open a previously opened tablespace. Previous tablespace

When receiving the error

    "InnoDB: Error: Attempted to open a previously opened tablespace. Previous tablespace"

when running a systemctl status mariadb.service it can often indicate a failed tablespace file. 

Performing the following may rectify the issue:

  1. Open my.cnf
  2. Look for [mysqld]
  3. Just below [mysqld] insert innodb_force_recovery = 1
  4. Start MySQL Service
  5. Stop MySQL Service
  6. Remove the line from my.cnf (or my.ini for Windows) (innodb_force_recovery = 1)
  7. Start MySQL Service
  8. Run a "tail -f /var/log/mysql/`servername`.log" and watch for further errors. If the tablespace issue reoccurs backup the database, remove the database, remove the files associated it @ /var/log/mysql/username_database* and reimporting it will often correct the .id file(s)
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