Try Before You Commit in Flyway

Sometimes we want to check whether it is possible to run a Flyway migration without error, but not actually make the changes. We might just need to 'sanity test' the performance of a migration on the Staging server, for example. By using a placeholder 'switch' to trigger a SQL Exception, we can get Flyway to roll-back its transaction, and therefore the migration, on demand. Read more

Finding the Version of a Flyway-managed Database Using SQL

Maintaining a version of a database opens a lot of possibilities, especially if an automated process can easily grab the current version, at runtime, using just SQL. You might, for example, have a routine that is only appropriate after a particular version. It is also very handy to be able to associate entries in an event log or bug report with the database version. No more desultory quests, when dealing with support issues, or when bug fixing, to find which database version was running when the bug happened. Read more

Improving the Quality of Data Governance: Where to Start?

How do we set about improving the quality of data governance within an organization? What are the priorities? Data Governance is generally considered to mean providing clear roles, responsibilities, policies, principles, and organizational structures that can ensure that data is managed well, in a way that benefits the whole organization. Where do you start? Read more

Data Governance: Joining the Dots

Every organization must perform data governance. This requires planning, oversight, and control over the management, security, resilience and quality of data and over the use of data by the organization. In larger organizations, it can be a complex task. William Brewer explains what's involved. Read more

Rollbacks, 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 more

Managing Static Data in Flyway Database Development

If your database application requires 'static data' to function, then the best way to manage that data is using a view based on a derived table. This article demonstrates ways to create these views, depending on your RDBMS's capabilities, and how to build and manage them in development work, using Flyway and PowerShell. Read more

Managing Datasets for Database Development Work using Flyway

A generic way of exporting, deleting and loading data, for database development work. It uses Flyway Teams, a PowerShell framework, JSON files for storage and a table manifest to define the correct order of dependency for each task. It should help a team maintain datasets between database versions, as well as to switch between the datasets required to support different types of testing. Read more

The Uses of Dependency Information in Database Development

Dependency information will allow you to avoid errors during a database build or tear-down, by ensuring you create or remove objects in the right order. It will also help you to avoid future 'invalid object' errors, because it will allow you to check that no database alterations have introduced broken references, during Flyway migrations. Read more

Performance Testing Databases with Flyway and PowerShell

Performance tests are central to the quality of the database changes we deliver because they ensure that any business process that accesses the database continues to return its results in an acceptable time. When Flyway creates a new version of the database, it is the ideal time to run these performance checks. Read more

Running Unit and Integration Tests during Flyway Migrations

In this article I'll give a practical example of developing a database, with Flyway, in such a way that it is automatically tested with whatever unit tests and integration tests you specify whenever you migrate the branch you're working on to the next version. If a test fails, you can work out why, undo the migration and then try again. Read more

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