working-with-keys.md

Working With Keys

Category: Redis

You can query Redis for information related to objects stored in the keyspace.

Start the Redis command line interface:

redis-cli

Count the number of keys using DBSIZE:

127.0.0.1:6379> DBSIZE
(integer) 371

List key information using INFO keyspace:

127.0.0.1:6379> INFO keyspace
# Keyspace
db0:keys=371,expires=371,avg_ttl=197287879

Set a value for a key:

127.0.0.1:6379> SET some-key "Some random string"

Find keys which match a specific wildcard pattern, for example, containing the string uname_to_access:

127.0.0.1:6379> KEYS *uname_to_access:*
1) "user-profile:uname_to_access:orbiks-mobile-app:maryh"
2) "user-profile:uname_to_access:orbiks-mobile-app:seanl"
3) "user-profile:uname_to_access:orbiks-mobile-app:fredq"

Note: KEYS is a command that should only be used in production environments with extreme care. It may seriously impact Redis server performance if run without a search filter against large databases.

Show whether a key exists:

127.0.0.1:6379> EXISTS some-key

Show the value for a key using the Redis-specific encoded format.

127.0.0.1:6379> DUMP some-key

Delete a key:

127.0.0.1:6379> DEL some-key

See Redis KEYS pattern for more details.