Managing PostgreSQL Extensions Using Flyway

Any reliable DevOps deployment process must not only deliver the right database code but also ensure that the correct conditions exist for the deployment to succeed. For PostgreSQL databases, this includes ensuring that any extensions on which the database code relies are installed, and at the correct version. Fortunately, Flyway will automatically track which extensions are installed on a database and at what version, so we can 'propagate' these changes accurately during deployments and avoid inconsistencies in database behavior and even application breakages. Read more

Finding 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 more

Undoing Actions on Groups of Database Tables

During development you'll occasionally need an undo script that drops a group of tables, or you might need to truncate a group of tables and then insert fresh data in order to run some tests. Unless you perform the required actions in the correct dependency order, you'll be tripped up by foreign key constraint violations. This article provides a SQL function that returns the list of tables in the correct dependency order. Read more

Dealing 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 more

Dealing 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 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

Checking for Missing Module References in a SQL Server Database Using Flyway

There are certain checks that need to be done after a database migration is complete. One good example of this is the check that a migration script, such as one that merges changes from a branch into main, doesn't cause 'invalid objects' (a.k.a. 'missing references') in your databases. I'll show you how to run this check, using sp_RefreshSQLModule, and incorporate it into a Flyway "after" migration script. Read more

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