ion</code> uses the
<em>parquet</em> data format as the best all-around solution, but in use
cases of infrequently updating tables with lots of database queries in
the meantime that need to be fast, and possibly the need for database
level statistics, the <em>sqlite</em> format is likely preferable.</p>
<p>When accessing cached data the package automatically checks if newer
versions are available and issues a warning if the cached version is out
of date. The <code>auto_update</code> argument can be set to
<