Support Health Check fail for Collation and Character Set using MySQL database

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Platform Notice: Server and Data Center Only - This article only applies to Atlassian products on the server and data center platforms.


Confluence is using MySQL database and may be exhibiting the following issue:

  • Healtcheck fails with the following problems

  • atlassian-confluence.log logs the following errors:
WARN [HealthCheckWatchdog:thread-*] [troubleshooting.healthcheck.concurrent.SupportHealthCheckTask] healthCheckError Unable to complete execution of health check Character Set due to an exception
java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.sql.SQLException: Tablespace '`confluence`.`supporthealthchecks`' exists.
WARN [HealthCheckWatchdog:thread-*] [troubleshooting.healthcheck.concurrent.SupportHealthCheckTask] healthCheckError Unable to complete execution of health check Collation due to an exception
Caused by: java.lang.RuntimeException: java.sql.SQLException: Tablespace '`confluence`.`supporthealthchecks`' exists.
Caused by: java.sql.SQLException: Tablespace '`confluence`.`supporthealthchecks`' exists.

  • MySQL log will show the following errors:

ERROR, InnoDB: Cannot create file './EDMconfluence/supporthealthchecks.ibd'
ERROR, InnoDB: The file './EDMconfluence/supporthealthchecks.ibd' already exists though the corresponding table did not exist in the InnoDB data dictionary. Have you moved InnoDB .ibd files around without using the SQL commands DISCARD TABLESPACE and IMPORT TABLE [truncated, 435 bytes total]



  • MySQL DB server

Diagnostic Steps

  • Verify that charset/collation is correctly set on DB to "utf8/utf8_bin" or "utf8mb4 / utf8mb4_bin" (available in Confluence 7.3 and later) in accordance with Database Setup For MySQL
  • Check if there is supporthealthchecks.ibd left on MySQL server with no corresponding *.frm file


A residual IBD file is left on /var/lib/ for support health checks, i.e. /var/lib/mysql/confluence/supporthealthchecks.ibd but there is no corresponding FRM file to accommodate it, so MySQL could not show the table.


  • Move supporthealthchecks.ibd file to another directory (do not delete)
  • Restart Confluence

Last modified on Feb 4, 2020

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