I've written an integration test for different OS's and different databases. Now I've created a matrix job with two axis (slaves & "database"). The slaves have multiple executors, being able to run the integration tests in parallel.

But for each database there exists only one account, therefor when running the build, axis combinations using the same database must not be running in parallel.

How about a (throttle-) flag in the axis definition to mark this axis not to be used in parallel? As a workaround I'm using the "Run each configuration sequentially", but it's unnecessary slow's down the build.