Available since: 1.0.0
Time complexity: O(N) with N being the number of keys in the database, under the assumption that the key names in the database and the given pattern have limited length.
Returns all keys matching
While the time complexity for this operation is O(N), the constant times are fairly low. For example, Redis running on an entry level laptop can scan a 1 million key database in 40 milliseconds.
KEYS as a command that should only be used in production
environments with extreme care.
It may ruin performance when it is executed against large databases.
This command is intended for debugging and special operations, such as changing
your keyspace layout.
KEYS in your regular application code.
If you're looking for a way to find keys in a subset of your keyspace, consider
SCAN or sets.
Supported glob-style patterns:
hbllo, ... but not
\ to escape special characters if you want to match them verbatim.
Array reply: list of keys matching