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Showing posts from October, 2013

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
FROM
msdb.dbo.sysmail_event_log 
ORDER BY
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 Optimization in SSAS

In a BI solutions, SSAS cube may contains billions of records. In such large volume of data, query processing will be crucial. End user wants to get the output without much delay and to cater that you need to optimize the query processing. Otherwise it may take minutes to get the query results.

Anyway before optimizing the cube, DW must be designed properly to get the good query performance. In this post, only the cube optimization is considered.
For cube optimization, two main approaches can be used

PartitioningAggregation Designing

Partitioning

Since there are large volumes of data, we can split those data of a measure group, into different portions by considering different attribute values. Those portions of data set of a measure group are called as partitions.
As an example we can create partitions considering the month value. For each month there will be different partitions under one measure group. Those partitions are not visible to the end user and the user will only see one me…