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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…

Filtering Dimension Members having the same name in a MDX Query...

Sometimes different dimension members having different key values may have the same name. This kind of situations mainly occurs when we set a default value to those unknown dimension member values. As an example if we set the value as "Unknown" for the items in the sales records, which do not match our existing items, then the key value for those items in the cube will be different but the name value will be same.

But if we try to filter those "Unknown" member values using the query designer, it will only filter the selected members. Otherwise we have to select all the members having the name value as Unknown, to filter those. But if there are large number of members having the same name, then it will be difficult and not feasible to select all those.

We can filter those in the MDX query using INSTR function. The query will looks as below.

   1: SELECT NON EMPTY { [Measures].[Sales] } ON COLUMNS, NON EMPTY { (
   2: [Items—Items_Vendor_Item].[Item Name].ALLMEMBERS ) } ON ROWS FROM
   3: [SalesCube]
   4: WHERE FILTER([Items—Items_Category_Item].[Item].Members, INSTR([Items—Items_Category_Item].CurrentMember.Name,'Unknown')=0)

Since it is not allowed to use the same hierarchy more than once in the query, two dimension hierarchies are used which contains Items.