I recently had the opportunity to deep dive on Azure Cosmos DB’s Change Feed feature for a project. In this post I’d like to share a few things I learned and provide clarity around change feed implementation details that were unclear to me from the docs.Continue reading
SQL Server database publishing with the ‘generate smart defaults’ option
If you’ve ever run a database package (.dacpac) publish against a SQL Server or Azure SQL database, chances are good that you have run into the following error when changing the schema for a table that contains data:
SQL72014: .Net SqlClient Data Provider: Msg 50000, Level 16, State 127, Line 6 Rows were detected. The schema update is terminating because data loss might occur.
How to find users near a central coordinate (spatial nearest neighbor queries)
You have a database table of users who have a location specified. Given an input location point, coordinate, or city – find the top N (or all) of the nearest neighbors in range. So for example, if I am in Seattle, return 15 nearest users to my location within a 50 mile range. This is a classic spatial/geography scenario with many applicable uses. I used this technique when building some Tourvival features.
Our example uses Microsoft SQL Server, or SQL Azure database. Let’s start by making an example users table.