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.
For First Generation instances, you should also check the expiration date of your client certificates, shown on the Connections page. If they have expired, you must create new client certificates before you can connect to your instance using SSL.
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.
Long-running operations cannot be cancelled or stopped
When you start a long-running 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 quickly 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, and is not guaranteed to provide up-to-date time settings. To change the default time zone for your instance, update the
default_time_zoneflag with the offset from UTC (for example,
+10:00). Automatic adjustment to daylight savings time is not supported; you must update the
default_time_zoneflag 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.