Product articles Redgate Flyway Database Deployments
How to Detect Database Drift using Flyway Snapshots
Unexpected changes to a database, known as drift, can cause inconsistencies between environments and break deployments. Flyway Enterprise provides powerful techniques to catch these unexpected changes in your databases, giving teams confidence that the version of the database they test is the one they release and that the target environment is in the expected state before deployment. Read moreFailed Database Deployments: Roll Back or Fix Forward?
This article explains the different ways to reverse or accelerate your way out of the problems caused by a failed database deployment, where a technique such as feature flags fits into your strategy, and how Flyway is designed to help you ensure both that you're fully prepared to take swift remedial measures, and that you minimize the need to use them. Read moreFlyway Alerting and Notifications
Once a scripted Flyway task is tested and bedded-in, it should rarely cause errors, so when one happens the team need to be notified immediately, especially if it is part of an automated deployment process. This article provides a PowerShell cmdlet that will execute any Flyway command, process and filter the Flyway output and send any errors to the chosen notification system. You can receive the Flyway error alerts on your mobile phone, if required! Read moreFinding External References in Database Deployments
This article outlines the syntax of the three and four dot references that usually denote external database references, demonstrates how to find them either from a live database or by using a text search of a script, and explains some of the complicating factors that can lead to 'false positives'. Read morePiping, Filtering and Using Flyway Output in PowerShell
Flyway's output is often overwhelmed with verbose messages, most of which we can ignore but some of which provide vital warnings about failed compilations, or useful details about what a migration or callback did. I'll show how to use some pipeline-aware PowerShell functions to filter out and save the bits we want and pass the results along in a form that is useful to the next process in the pipeline. Read moreDealing with Mutually Dependent Databases in Flyway
How to create and manage 'stub' objects, in Flyway migrations, in order to overcome build failures caused by circular, or mutual, dependencies between objects in different databases. The technique should be applicable to any RDBMS. Read moreDealing with Cross-Server Database Dependencies in Flyway Projects
How to tackle database development in Flyway when databases make cross-server references. The technique uses synonyms to represent the remote objects, and local 'stub' objects to overcome the problems caused by 'missing references' when building the individual objects. Read moreExecuting Optional Code in Flyway Callbacks
When you are building or migrating a database, it is nice to have a system that you can easily configure for various tasks, such as logging, loading or dumping data, or backing up of the database. This article demonstrates how we can use a Flyway placeholder as a simple on/off switch for each task, during Flyway migrations. Read moreRollbacks, Undos and Undonts
Rollback scripts are designed to allow us to recover safely from a failed deployment that leaves the database in an indeterminate state. They must check exactly what needs to be reverted before doing so. If you work with an RDBMS that cannot support transaction DDL rollback they are vital. This article proposes a strategy where you create and test a rollback file, at the same time as the forward migration, and reuse it as a Flyway undo script. Read moreRedgate Hub
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