Chronix is a time series database that can efficiently store billions of time series data points in a small amount of disk space and retrieve data within milliseconds. It works by splitting time series into fixed-size chunks, compressing the chunks, and storing the compressed chunks and associated metadata in Solr/Lucene records. Chronix provides common time series aggregations, transformations, and analyses through its API. The developers tuned Chronix's performance by evaluating different compression techniques and chunk sizes on real-world time series data. Chronix outperformed other time series databases in storage needs and query speeds in their tests.