KeysCommand

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KEYS _pattern_

-Time complexity: O(n) (with n being the number of keys in the DB, and assuming keys and pattern of limited length)

Returns all the keys matching the glob-style pattern asspace separated strings. For example if you have in thedatabase the keys "foo" and "foobar" the command "KEYS foo*"will return "foo foobar".

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. Still it's better to consider this one of -
the slow commands that may ruin the DB performance if not usedwith care*.
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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 Sets in order to group together a subset of objects.
-Glob style patterns examples: -
* h?llo will match hello hallo hhllo* h*llo will match hllo heeeello* h[ae]llo will match hello and hallo, but not hillo
Use \ to escape special chars if you want to match them verbatim.
Return value
-Multi bulk reply

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