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Email Alerts are not received...

In one of application, Email alerts are sent using SQL sp_send_dbmail stored procedure. Email alerts were working properly, but suddenly noticed email alerts are not received.

To troubleshoot the issue, first I checked the msdb.dbo.sysmail_event_log table using the below query.

SELECT log_id, event_type, log_date, description, process_id, mailitem_id, account_id, last_mod_date, last_mod_user
log_date DESC

If there is any error, you should see records with the event_type value as error.
In my case there are records with event_type value as error, and the description value for those records is same as below

The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 3 (2018-02-01T10:41:27). Exception Message: Cannot send mails to mail server. (The SMTP server requires a secure connection or the client was not authenticated. The server response was: Authentication required).  )

As per the error descript…

Cube File is Corrupted...

While trying to view SSRS reports, which load the SSAS cube data I got the below error message.

File system error: The following file is corrupted: Physical file: \\?\C:\Program Files\Microsoft SQL Server\MSSQL.2\OLAP\Data\Sales.0.db\Customer.0.dim\5.English Education.(All).sstore. Logical file . Errors in the metadata manager. An error occurred when loading the Customer dimension, from the file, '\\?\C:\Program Files\Microsoft SQL Server\MSSQL.2\OLAP\Data\ Sales.0.db\Customer.5.dim.xml'. Errors in the metadata manager. An error occurred when loading the A Sales cube, from the file, '\\?\C:\Program Files\Microsoft SQL Server\MSSQL.2\OLAP\Data\ Sales.0.db\Adventure Works DW.9.cub.xml'.

The reason for this error message is the the cube file in the file system is corrupted.
You can't this issue by just redeploying the cube. When you try to deploy the cube, you will get the same error message and deployment process will get failed.

You can fix the above issue by following below steps.
1. Stop the Analysis Service
2. Delete everything in the C:\Program Files\Microsoft SQL Server\MSSQL.2\OLAP\Data\%YOUR_PROJECTNAME% folder
3. Restart the Analysis Service.
4. Connect to the Analysis Service using SQL Server Management Studio.
5. Delete the Analysis Service database which you got the error.
6. Re-deploy the SSAS project.

Those steps will fix the above issue.