<i>Time complexity: O(n) (with n being the number of keys in the DB, and assuming keys and pattern of limited length)</i><blockquote>Returns all the keys matching the glob-style <i>pattern</i> asspace separated strings. For example if you have in thedatabase the keys "foo" and "foobar" the command "KEYS foo<codename="code"class="python">*</code>"will return "foo foobar".</blockquote>
<blockquote>Note that while the time complexity for this operation is O(n)the constant times are pretty low. For example Redis runningon an entry level laptop can scan a 1 million keys databasein 40 milliseconds. <b>Still it's better to consider this one of
<blockquote>the slow commands that may ruin the DB performance if not usedwith care*.</blockquote>
<blockquote>In other words this command is intended only for debugging and *special* operations like creating a script to change the DB schema. Don't use it in your normal code. Use Redis <ahref="Sets.html">Sets</a> in order to group together a subset of objects.</blockquote>
<blockquote>* h?llo will match hello hallo hhllo* h*llo will match hllo heeeello* h<codename="code"class="python">[</code>ae<codename="code"class="python">]</code>llo will match hello and hallo, but not hillo</blockquote>Use \ to escape special chars if you want to match them verbatim.<h2><aname="Return value">Return value</a></h2>
