Known issues

This page lists known issues with Cloud SQL for MySQL, along with ways you can avoid or recover from these issues.

If you are experiencing issues with your instance, make sure you also review the Operational Guidelines, as well as the information in Diagnosing Issues.

Data durability and availability issues

  • Generated columns (MySQL 5.7 instances only)

    Due to an issue in MySQL, using generated columns might result in data corruption. For more information, see MySQL bug #82736.

Instance connection issues

  • Expired SSL/TLS certificates

    If your instance is configured to use SSL, go to the Cloud SQL Instances page in the Cloud Console and open the instance. Open its Connections page and make sure that your server certificate is valid. If it has expired, you must add a new certificate and rotate to it. Learn more.

  • Cloud SQL Proxy version

    If you are connecting using the Cloud SQL Proxy, make sure you are using the most recent version. For more information, see Keeping the Cloud SQL Proxy up to date.

  • Not authorized to connect

    If you try to connect to an instance that does not exist in that project, the error message only says that you are not authorized to access that instance.

Administrative issues

  • Long-running Cloud SQL instance operations cannot be cancelled or stopped

    When you start a long-running Cloud SQL instance operation, such as an import or export operation, you cannot stop the operation before it completes. In addition, only one operation can run against an instance at at time.

    For this reason, make sure you do not need to do other work on an instance when you start a long-running operation.

  • Instance names cannot be reused immediately after instance deletion

    After you delete an instance, you cannot immediately reuse the instance name, because Cloud SQL reserves that name for a few days. If you need to create and delete instances with the same name, consider using a timestamp as part of the name to avoid name conflicts.

  • Setting the time zone for MySQL instances

    It is possible to set the MySQL time zone to a named area, such as "Europe/Moscow", using a session variable. However, doing so is not supported in Cloud SQL, and is not guaranteed to provide up-to-date time settings. To change the default time zone for your instance, update the default_time_zone flag with the offset from UTC (for example, +10:00). Automatic adjustment to daylight savings time is not supported; you must update the default_time_zone flag manually to account for daylight savings time.

Issues with importing and exporting data

  • CSV export does not format NULLs and newlines correctly

    When you export data as CSV using the Cloud SQL export feature, NULLs are exported as "N, which can cause the CSV file to contain unbalanced quotation marks. Additionally, if your text data contains a newline character, a trailing quote mark is added at the end of the line.

  • The SQL Mode setting affects how Cloud SQL interprets SQL queries.

    For example, if you export from a database without Strict SQL enabled, then try to import to Cloud SQL (which enables Strict SQL by default), the import might fail. The best practice is to use the same SQL Mode on import that you used for export.

  • The DEFINER clause may cause import to fail

    A DEFINER clause may cause an import operation to fail if the DEFINER user is a SUPER or system user and is different from the user doing the import into Cloud SQL. Learn more about DEFINER usage and potential workarounds in Cloud SQL.