Redis - Server


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Redis server commands are basically used to manage Redis server.

Example

Following example explains how we can get all statistics and information about the server.

redis 127.0.0.1:6379> INFO  

# Server 
redis_version:2.8.13 
redis_git_sha1:00000000 
redis_git_dirty:0 
redis_build_id:c2238b38b1edb0e2 
redis_mode:standalone 
os:Linux 3.5.0-48-generic x86_64 
arch_bits:64 
multiplexing_api:epoll 
gcc_version:4.7.2 
process_id:3856 
run_id:0e61abd297771de3fe812a3c21027732ac9f41fe 
tcp_port:6379 
uptime_in_seconds:11554 
uptime_in_days:0 hz:10 
lru_clock:16651447 
config_file:  

# Clients 
connected_clients:1
client_longest_output_list:0 
client_biggest_input_buf:0 
blocked_clients:0  

# Memory 
used_memory:589016 
used_memory_human:575.21K 
used_memory_rss:2461696 
used_memory_peak:667312 
used_memory_peak_human:651.67K 
used_memory_lua:33792 
mem_fragmentation_ratio:4.18 
mem_allocator:jemalloc-3.6.0  

# Persistence 
loading:0 
rdb_changes_since_last_save:3 
rdb_bgsave_in_progress:0 
rdb_last_save_time:1409158561 
rdb_last_bgsave_status:ok 
rdb_last_bgsave_time_sec:0 
rdb_current_bgsave_time_sec:-1 
aof_enabled:0 
aof_rewrite_in_progress:0 
aof_rewrite_scheduled:0 
aof_last_rewrite_time_sec:-1 
aof_current_rewrite_time_sec:-1 
aof_last_bgrewrite_status:ok 
aof_last_write_status:ok  

# Stats 
total_connections_received:24 
total_commands_processed:294 
instantaneous_ops_per_sec:0 
rejected_connections:0 
sync_full:0 
sync_partial_ok:0 
sync_partial_err:0 
expired_keys:0 
evicted_keys:0 
keyspace_hits:41
keyspace_misses:82 
pubsub_channels:0 
pubsub_patterns:0 
latest_fork_usec:264  

# Replication 
role:master 
connected_slaves:0 
master_repl_offset:0 
repl_backlog_active:0 
repl_backlog_size:1048576 
repl_backlog_first_byte_offset:0 
repl_backlog_histlen:0  

# CPU 
used_cpu_sys:10.49 
used_cpu_user:4.96 
used_cpu_sys_children:0.00 
used_cpu_user_children:0.01  

# Keyspace 
db0:keys = 94,expires = 1,avg_ttl = 41638810 
db1:keys = 1,expires = 0,avg_ttl = 0 
db3:keys = 1,expires = 0,avg_ttl = 0 

Redis Server Commands

Following table lists some basic commands related to Redis server.

S.No Command & Description
1 BGREWRITEAOF

Asynchronously rewrites the append-only file

2 BGSAVE

Asynchronously saves the dataset to the disk

3 CLIENT KILL [ip:port] [ID client-id]

Kills the connection of a client

4 CLIENT LIST

Gets the list of client connections to the server

5 CLIENT GETNAME

Gets the name of the current connection

6 CLIENT PAUSE timeout

Stops processing commands from the clients for a specified time

7 CLIENT SETNAME connection-name

Sets the current connection name

8 CLUSTER SLOTS

Gets an array of Cluster slot to node mappings

9 COMMAND

Gets an array of Redis command details

10 COMMAND COUNT

Gets total number of Redis commands

11 COMMAND GETKEYS

Extracts the keys given a full Redis command

12 BGSAVE

Asynchronously saves the dataset to the disk

13 COMMAND INFO command-name [command-name ...]

Gets an array of specific Redis command details

14 CONFIG GET parameter

Gets the value of a configuration parameter

15 CONFIG REWRITE

Rewrites the configuration file with the in-memory configuration

16 CONFIG SET parameter value

Sets a configuration parameter to the given value

17 CONFIG RESETSTAT

Resets the stats returned by INFO

18 DBSIZE

Returns the number of keys in the selected database

19 DEBUG OBJECT key

Gets debugging information about a key

20 DEBUG SEGFAULT

Makes the server crash

21 FLUSHALL

Removes all the keys from all databases

22 FLUSHDB

Removes all the keys from the current database

23 INFO [section]

Gets information and statistics about the server

24 LASTSAVE

Gets the UNIX time stamp of the last successful save to the disk

25 MONITOR

Listens for all the requests received by the server in real time

26 ROLE

Returns the role of the instance in the context of replication

27 SAVE

Synchronously saves the dataset to the disk

28 SHUTDOWN [NOSAVE] [SAVE]

Synchronously saves the dataset to the disk and then shuts down the server

29 SLAVEOF host port

Makes the server a slave of another instance, or promotes it as a master

30 SLOWLOG subcommand [argument]

Manages the Redis slow queries log

31 SYNC

Command used for replication

32 TIME

Returns the current server time



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