Redis is an advanced key-value store. It is often referred to as a data
structure server since keys can contain strings, hashes, lists, sets and
You can run atomic operations on these types, like appending to a string;
incrementing the value in a hash; pushing to a list; computing set
intersection, union and difference; or getting the member with highest
ranking in a sorted set.
In order to achieve its outstanding performance, Redis works with an
in-memory dataset. Depending on your use case, you can persist it either
by dumping the dataset to disk every once in a while, or by appending
each command to a log.
Redis also supports trivial-to-setup master-slave replication, with very
fast non-blocking first synchronization, auto-reconnection on net split
and so forth.
Other features include Transactions, Pub/Sub, Lua scripting, Keys with a
limited time-to-live, and configuration settings to make Redis behave like
You can use Redis from most programming languages also.
**Redis 6.2.4** - Released Tue June 1 12:00:00 IST 2021 Upgrade urgency:
SECURITY, Contains fixes to security issues that affect authenticated client
connections. MODERATE otherwise. Fix integer overflow in STRALGO LCS
(**CVE-2021-32625**) An integer overflow bug in Redis version 6.0 or newer can
be exploited using the STRALGO LCS command to corrupt the heap and potentially
result with remote code execution. This is a result of an incomplete fix by
CVE-2021-29477. Bug fixes that are only applicable to previous releases of
Redis 6.2: * Fix crash after a diskless replication fork child is terminated
(#8991) * Fix redis-benchmark crash on unsupported configs (#8916) Other bug
fixes: * Fix crash in UNLINK on a stream key with deleted consumer groups
(#8932) * SINTERSTORE: Add missing keyspace del event when none of the sources
exist (#8949) * Sentinel: Fix CONFIG SET of empty string sentinel-user/sentinel-
pass configs (#8958) * Enforce client output buffer soft limit when no traffic
(#8833) Improvements: * Hide AUTH passwords in MIGRATE command from slowlog