A deep dive into Spanner’s query optimizer — Campbell Fraser, Vlad Lifliand @ Google Cloud Blog

A good introduction to how the query optimizer works on a simple example. In this article, you will find what types of optimizations are used in Spanner, what optimizer statistics are collected, and how to deal with different optimizer versions.

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Spanner on a modern columnar storage engine — Yuanyuan Zhao @ Google Cloud blog

Spanner processes over 2 billion QPS in peak and stores over 6 exabytes of data. Do you know how to implement migration from one storage engine to another without outages and performance regressions on such a scale? This article is about the strategy Google applied to implement such significant migration for Spanner.

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