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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…

Distinct Count in SSAS

In some scenarios we may need to get the Distinct Count value. As an example we may need to get the items purchased from a particular supplier. In such scenario we need to get the distinct items from the purchase orders, since the same item will be available in different purchase orders.
For that below expression can be used.

   1: DistinctCount(Nonempty([Item].[Item].[Item].Members, [Measures].[Fact Purchase Count]))

FactPurchase is our Fact table which stores Purchase Order data and Item is the dimension which keeps Item information. By default when we create a Measure Group in the Cube, it automatically adds the Count measure. In the above expression what it does is, it joins the Item Dimension with that Count measure and get the distinct Items from it.