Lessons learned implementing database deployments

Implementing database deployments can be challenging due to various issues such as tightly coupled databases, which lead to dependencies and conflicts between different applications, as illustrated by an incident where changes to one application's database schema caused another application to fail. Problems also arise from circular dependencies during automated deployments and issues with Redgate SQL Source Control when using a three-part naming convention, which can disrupt the build order. Default constraints without explicit names in Microsoft SQL Server can lead to deployment failures due to mismatched constraint names, while mixing deployment technologies like Redgate SQL Source Control and DbUp can result in unintended repeated execution of scripts. Additionally, state-based deployment software, although powerful, can have bugs, such as incorrect handling of identity columns, which can complicate deployments. These experiences highlight the complexities and potential pitfalls in database deployment processes, underscoring the importance of careful planning and troubleshooting to avoid time-consuming issues.