# Rerun Data Store
Part of the [`rerun`](https://github.com/rerun-io/rerun) family of crates.
[](https://crates.io/crates/re_data_store)
[](https://docs.rs/re_data_store)


[Apache Arrow](https://arrow.apache.org/) is a language-independent columnar memory format for arbitrary data.
The `re_data_store` crate is an in-memory time series database for Rerun log data. It is indexed by Entity path, component, timeline, and time. It supports out-of-order insertions, and fast `O(log(N))` queries.