SharePoint 2010 – How Alerts works?
Posted by JP on April 12, 2013
In this article we can explore the underlying infrastructure of SharePoint Alerts. Let us analyze step by step what is happening in the background when we create an alert, alert is triggered, email is sent etc.
What are Alerts?
SharePoint provides an excellent feature which notifies the users on changes of item/library.
Uses can set alerts on:
· Library / List
· Document / Item
You can set alerts through the SharePoint user interface as shown below:
In order to see the above button, you need to set your Email Server in Central Administration > System Settings > Configure outgoing e-mail settings.
For receiving the emails triggered you can use an SharePoint Email Notification Tool like smtp4dev.
Now you are ready to create an alert & we can examine what happens in the database.
Open the database & you can see the following recode in ImmedSubscriptions table.
You can see that the ListId column is assigned with List GUID.
The table structure follows:
You can see database server & name through Central Administration > Manage content databases link.
If you have created a Summary Alert (daily or weekly) you can see the record was created inside SchedSubscriptions table.
The structure of SchedSubscriptions table.
Timer Jobs are responsible for building the Alert using template & sending the Emails. We can see the timer job status through Central Administration > Monitoring > Check job status link.
Scrolling down, you can see the Timer Job for Immediate Alert.
You can see the Status of last execution there. In my case it is succeeded. Click on the link to see the settings as shown below:
In the above case the Timer Job is scheduled to run every 5 minutes. You can try clicking the Run Now button to trigger execution.
Timer Job creates the email content of through Alert Template file. We can modify the file, but copying & modifying is recommended. We can define template in the list & library level.
The Alert template can be found in 14 hive > TEMPLATE > XML folder.
By default there are 2 templates – one for email & other for sms. The alerttemplates.xml file contains around 10 thousand lines.
We can change the alert template through PowerShell & STSADM commands.
In this article we have explored the activities & tables involved while working with SharePoint Alerts.