Stored Procedures, Triggers and UDFs are executed in the Database engine
Currently only supported by the SQL API
Defined using JavaScript
Stored Procedures
Stored Procedures execute on a single partition and has access only to that logical partition
Partition Key needs to be provided with the execution request
Does support transactions (i.e. if failure occurs off operations will be rolled back)
Triggers
Triggers can be executed before (pre) or after (post) writing of data
Triggers are not guaranteed to be executed
They can only work on data from a single logical partition
Supports transactions
Change Feed
React to changes that occur in the Cosmos DB engine using server-side code
Allows to be notified for any insert and update operations (Delete not supported)
Reading data from database will consume throughput
Not supported for Azure Table API