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<div class="section" id="storage-formats">
<h1>Storage Formats<a class="headerlink" href="#storage-formats" title="Permalink to this headline">¶</a></h1>
<p>To ensure that older clients do not access data incorrectly,
Bazaar’s policy is to introduce a new storage format whenever
new features requiring new metadata are added. New storage
formats may also be introduced to improve performance and
scalability.</p>
<p>The newest format, 2a, is highly recommended. If your
project is not using 2a, then you should suggest to the
project owner to upgrade.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Some of the older formats have two variants:
a plain one and a rich-root one. The latter include an additional
field about the root of the tree. There is no performance cost
for using a rich-root format but you cannot easily merge changes
from a rich-root format into a plain format. As a consequence,
moving a project to a rich-root format takes some co-ordination
in that all contributors need to upgrade their repositories
around the same time. 2a and all future formats will be
implicitly rich-root.</p>
</div>
<p>See <a class="reference internal" href="current-formats-help.html"><span class="doc">Current Storage Formats</span></a> for the complete list of
currently supported formats. See <a class="reference internal" href="other-formats-help.html"><span class="doc">Other Storage Formats</span></a> for
descriptions of any available experimental and deprecated formats.</p>
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