Redis Server-side commands

Redis 127.0.0.1:6380> time , display server times , timestamp ( seconds ), microseconds

1) "1375270361"

2) "504511"

redis127.0.0.1:6380> dbsize // number of keys in the current database

(integer) 2

Redis127.0.0.1:6380> Select 2

Ok

Redis127.0.0.1:6380[2]> dbsize

(integer) 0

Redis127.0.0.1:6380[2]>

bgrewriteaof background process rewrite AOF

BGSAVE background Save Rdb Snapshot

Save the Rdb snapshot

Lastsave Last Saved time

Slaveofmaster-host Port, set the current instance to master slave

Flushall Empty All library keys

FLUSHDB clears all keys for the current library

Showdown[save/nosave]

Note : If you accidentally run the Flushall, immediately Shutdownnosave, shut down the server

then manual edit aof file , Remove files from "flushall " related rows , then turn on the server , can be imported back to the original data

If , after Flushall , the system happens to be bgrewriteaof, then the aof is emptied and the data is lost .

Slowlog Show Slow Query

Note : How slow is slow ?

Answer : specified by slowlog-log-slower-than10000 , (in microseconds )

How many slow query records does the server store ?

Answer : by slowlog-max-len128 , to do the restriction

Info[replication/cpu/memory..]

View information for a redis server

Configget Configuration Items

ConfigSet configuration Item Value (special option , not allowed with this command setting , such as slave-of, need to be set with separate slaveof command )

Parameters to be aware of when Redis operations

1: Memory

#Memory

used_memory:859192 Space for data structures

used_memory_rss:7634944 Real Space

mem_fragmentation_ratio:8.89 ago2 proportion ,1.n for best , If this value is too large , description redis,

2: Master-slave replication

#Replication

Role:slave

master_host:192.168.1.128

master_port:6379

Master_link_status:up

3: Persistent

#Persistence

rdb_changes_since_last_save:0

rdb_last_save_time:1375224063

4:fork Time consuming

#Status

latest_fork_usec:936 last export of Rdb snapshot , persistence takes microseconds

note :10g content , export required 2 minutes

Writes 10,000 times per minute , resulting in an ongoing RDB export , where the disk is in a high io State .

5: Slow Log

Configget/set Slowlog-log-slower-than

Configget/set Slowlog-max-len

Slowlogget N Get slow log

Run-time change master-slave

Modify a slave (set to a) to newmaster

1. Command This service not to do other Redis service slave

Command : slaveof no One

2. Modify its readonly to Yes

The other slave point to newmaster A .

1. Command This service for newmaster a slave

Command format SLAVEOFIP Port

Redis Server-side commands