I wanted to share some of my first experiences and thoughts about this new feature.
Why is it good for us?
There are a couple of use cases. One of them is if you want to drop an index, but want to know the effect beforehand. You can make it invisible to the optimizer. It is a quick metadata change to make an index invisible. Once you are sure there is no performance degradation, you can then drop the index.
The main point is that the invisible index is unavailable for use by the optimizer, but it is still present and kept up-to-date by write operations. The optimizer won’t use it, even if we try to “FORCE INDEX”. I think we should be …[Read more]