This page lists known issues with Cloud SQL for SQL Server, along with ways you can avoid or recover from these issues.
Instance connection issues
Expired SSL/TLS certificates
If your instance is configured to use SSL, go to the Cloud SQL Instances page in the Google Cloud console and open the instance. Open its Connections page, select the Security tab and make sure that your server certificate is valid. If it has expired, you must add a new certificate and rotate to it.
Cloud SQL Auth proxy version
If you are connecting using the Cloud SQL Auth proxy, make sure you are using the most recent version. For more information, see Keeping the Cloud SQL Auth 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.
A large export operation can adversely affect instance availability
Before starting a large export, ensure that at least 25 percent of the database size is free (on the instance). Doing so helps prevent issues with aggressive autogrowth, which can affect the availability of the instance.
If your SQL Server instance uses a SQL Server Express edition:
If you specify a flag when you create a new instance, creation of the instance fails.
You cannot set database flags on an existing instance.
Long-running Cloud SQL instance operations can't be cancelled or stopped
Only one operation can run at a time on a Cloud SQL instance. For this reason, make sure you don't need to perform other operations on an instance when you start a long-running operation.
When you start a long-running Cloud SQL instance operation, such as an import or export operation, there's no way to cancel the operation without restarting the instance.
Issues with importing and exporting data
Do not create a BAK file (for import) from a read-only database or from a database that is in single-user mode. If you create a BAK file from a read-only database or from a database that is in single-user mode, and import that file, an error may occur.
- Cloud Storage supports a maximum single-object size up five terabytes. If you have databases larger than 5TB, the export operation to Cloud Storage fails. In this case, you need to break down your export files into smaller segments.
Transaction logs and disk growth
Logs are purged once daily, not continuously. When the number of days of log retention is configured to be the same as the number of backups, a day of logging might be lost, depending on when the backup occurs. For example, setting log retention to seven days and backup retention to seven backups means that between six and seven days of logs will be retained.
We recommend setting the number of backups to at least one more than the days of log retention to guarantee a minimum of specified days of log retention.