Disable Analytics in Sitecore 8

Step 1: Disable Analytics in Config: 

Go to /App_Config/Include/Sitecore.Analytics.config and set Analytics.Enabled to false:

<setting name="Analytics.Enabled" value="false" />

Step 2: Comment out connection strings related to analytics in connectionstrings.

<add name="analytics" connectionString="mongodb://localhost/analytics" />
<add name="tracking.live" connectionString="mongodb://localhost/tracking_live" />
<add name="tracking.history" connectionString="mongodb://localhost/tracking_history" />
<add name="tracking.contact" connectionString="mongodb://localhost/tracking_contact" />
<add name="reporting" connectionString="user id=Prakash;password=patel;Data Source=(patel);Database=Sitecore_Analytics" />