arangosh&gt; a1 = db.example.insert({ a : <span class="hljs-number">1</span> });
{ 
  <span class="hljs-string">"_id"</span> : <span class="hljs-string">"example/324685384"</span>, 
  <span class="hljs-string">"_rev"</span> : <span class="hljs-string">"324685384"</span>, 
  <span class="hljs-string">"_key"</span> : <span class="hljs-string">"324685384"</span> 
}
arangosh&gt; db._remove(a1);
<span class="hljs-literal">true</span>
arangosh&gt; db._remove(a1);
[ArangoError <span class="hljs-number">1202</span>: <span class="hljs-built_in">document</span> not found]
arangosh&gt; db._remove(a1, <span class="hljs-literal">true</span>);
<span class="hljs-literal">false</span>