TencentDB for Redis® CKV Edition (standard architecture) uses a master/replica node deployment architecture to provide data persistence and backup, making it suitable for scenarios that require both high data reliability and availability.
A master node provides daily service access, while a replica node ensures high availability (HA). In case that the master node fails, the system will automatically switch to the replica node to guarantee business continuity. CKV Edition (standard architecture) is compatible with Redis 3.2 commands and protocols and supports a specification of 4–384 GB to meet the needs of large-capacity storage.
Features
Robust service
With a dual-server master/replica architecture, the master and replica nodes reside on different physical machines with the master node providing external access and the replica node providing data backup and HA. You can perform data CRUD using the Redis command line or client. In case that the master node fails, the proprietary HA system will automatically perform master/replica switchover to ensure smooth operation of the business.-Reliable data
The data persistence feature is enabled by default with all data stored in disks. CKV Edition (standard architecture) supports data backup. You can roll back or clone instances from backup sets to effectively cope with data misoperations and other issues.
Lower latency
CKV uses a high-performance network platform and a proxy-free architecture, which significantly reduce the access latency and network latency by up to 60% in high-load scenarios.
Read-only replicas
CKV Edition (standard architecture) can greatly improve the read performance by 40% on average by enabling read-only replica. The read-only replica feature is not enabled by default. Currently, you can submit a ticket for application. Due to the replication delay between the CKV master node and replica node, after the read-only replica feature is enabled, some legacy data may be read; therefore, please confirm whether your business can accept slight data inconsistency before enabling this feature.
Smooth upgrade
With unique schemes, CKV Edition (standard architecture) can ensure the business-imperceptible version upgrade, thus maximizing the service availability.
Use Limits
CKV Edition (standard architecture) supports up to 120,000 QPS. If you need a higher QPS, you can choose the cluster architecture that supports tens of millions of QPS.
-The minimum unit of pttl in CKV Edition is second, which is different from Redis Community Edition.
Currently, string-type keys are supported, and a value can be up to 32 MB.
The instance connection method is instance ID:password, which is different from that of the Memory Edition in standard or cluster architecture.
The time complexity implemented by the dbsize command is O(n). When the command is executed, it needs to traverse all keys in the current database; therefore, it should be used with caution.
There is a built-in string-type key: {ckv_plus_pub_sub}_patterns, which is used to support the pub/sub feature. If you need to use this feature, please do not delete this key; otherwise, subscriptions will become invalid.
Event notification currently does not support notifications of expiration and eviction policy.
The eviction policy currently only supports volatile-lru. The eviction mechanism can be disabled with the corresponding parameter maxmemory-policy.
Connection Example
CKV Edition (standard architecture) only supports the password format: instance id:password. For example, if your instance ID is crs-bkuza6i3 and the password is abcd1234, the connection command is redis-cli -h IP address -p port -a crs-bkuza6i3:abcd1234.
Compatibility
Commands supported by CKV Edition (standard architecture):
connection Group
geo Group
hashes Group
hyperloglog Group
keys Group
lists Group
pub/sub Group
server Group
auth
geoadd
hdel
pfadd
del
lindex
psubscribe
command
echo
geohash
hexists
pfcount
scan
linsert
pubsub
dbsize
ping
geopos
hget
pfmerge
exists
llen
publish
info
quit
geodist
hgetall
-
expire
lpop
punsubscribe
time
select
georadius
hincrby
-
expireat
lpush
subscribe
-
-
georadiusbymember
hincrbyfloat
-
keys
lpushx
unsubscribe
-
-
-
hkeys
-
type
lrange
-
-
-
-
hlen
-
move
lrem
-
-
-
-
hmget
-
ttl
lset
-
-
-
-
hmset
-
persist
ltrim
-
-
-
-
hset
-
pexpire
rpop
-
-
-
-
hsetnx
-
pexpireat
rpoplpush
-
-
-
-
hstrlen
-
pttl
rpush
-
-
-
-
hvals
-
randomkey
rpushx
-
-
-
-
hscan
-
rename
-
-
-
-
-
-
-
renamenx
-
-
-
-
-
-
-
sort
-
-
-
sets Group
sorted sets Group
strings Group
transactions Group
scripting Group
sadd
zadd
append
discard
eval
scard
zcard
bitcount
exec
script debug
sdiff
zcount
bitop
multi
script exists
sdiffstore
zincrby
bitpos
unwatch
script flush
sinter
zinterstore
decr
watch
script kill
sinterstore
zlexcount
decrby
-
script load
sismember
zrange
get
-
-
smembers
zrangebylex
getbit
-
-
smove
zrangebyscore
getrange
-
-
spop
zrank
getset
-
-
srandmember
zrem
incr
-
-
srem
zremrangebylex
incrby
-
-
sscan
zremrangebyrank
incrbyfloat
-
-
sunion
zremrangebyscore
mget
-
-
sunionstore
zrevrange
mset
-
-
-
zrevrangebylex
msetnx
-
-
-
zrevrangebyscore
psetex
-
-
-
zrevrank
set
-
-
-
zscan
setbit
-
-
-
zscore
setex
-
-
-
zunionstore
setnx
-
-
-
-
setrange
-
-
-
-
strlen
-
-
Commands not supported by CKV Edition (standard architecture):
