Redis 学习之持久化机制、发布订阅、虚拟内存详解程序员

################################ SNAPSHOTTING  ################################ 
# 
# Save the DB on disk: 
# 
#   save <seconds> <changes> 
# 
#   Will save the DB if both the given number of seconds and the given 
#   number of write operations against the DB occurred. 
# 
#   In the example below the behaviour will be to save: 
#   after 900 sec (15 min) if at least 1 key changed 
#   after 300 sec (5 min) if at least 10 keys changed 
#   after 60 sec if at least 10000 keys changed 
# 
#   Note: you can disable saving completely by commenting out all "save" lines. 
# 
#   It is also possible to remove all the previously configured save 
#   points by adding a save directive with a single empty string argument 
#   like in the following example: 
# 
#   save "" 
 
save 900 1 
save 300 10 
save 60 10000

appendonly yes 
 
# The name of the append only file (default: "appendonly.aof") 
 
appendfilename "appendonly.aof" 
 
# The fsync() call tells the Operating System to actually write data on disk 
# instead of waiting for more data in the output buffer. Some OS will really flush 
# data on disk, some other OS will just try to do it ASAP. 
# 
# Redis supports three different modes: 
# 
# no: don't fsync, just let the OS flush the data when it wants. Faster. 
# always: fsync after every write to the append only log. Slow, Safest. 
# everysec: fsync only one time every second. Compromise. 
# 
# The default is "everysec", as that's usually the right compromise between 
# speed and data safety. It's up to you to understand if you can relax this to 
# "no" that will let the operating system flush the output buffer when 
# it wants, for better performances (but if you can live with the idea of 
# some data loss consider the default persistence mode that's snapshotting), 
# or on the contrary, use "always" that's very slow but a bit safer than 
# everysec. 
# 
# More details please check the following article: 
# http://antirez.com/post/redis-persistence-demystified.html 
# 
# If unsure, use "everysec". 
 
# appendfsync always 
appendfsync everysec 
# appendfsync no

[[email protected] bin]# cat appendonly.aof  
*2 
$6 
SELECT 
$1 
0 
*3 
$3 
set 
$4 
addr 
$2 
bj

127.0.0.1:6379> subscribe tv1   订阅频道tv1 
Reading messages... (press Ctrl-C to quit) 
1) "subscribe"   
2) "tv1" 
3) (integer) 1

127.0.0.1:6379> subscribe tv1 tv2   订阅频道tv1和tv2 
Reading messages... (press Ctrl-C to quit) 
1) "subscribe" 
2) "tv1" 
3) (integer) 1 
1) "subscribe" 
2) "tv2" 
3) (integer) 2

127.0.0.1:6379> publish tv1 "Hello word"  #给频道tv1发布信息 
(integer) 2     # tv1的订阅者2位 
127.0.0.1:6379> publish tv2 "Hello tv2"   #给频道tv2发布信息 
(integer) 1    # tv2的订阅者1位 
127.0.0.1:6379> 

127.0.0.1:6379> subscribe tv1 
Reading messages... (press Ctrl-C to quit) 
1) "subscribe" 
2) "tv1" 
3) (integer) 1 
1) "message"     #获取了tv1发布的信息 
2) "tv1" 
3) "Hello word"

127.0.0.1:6379> subscribe tv1 tv2 
Reading messages... (press Ctrl-C to quit) 
1) "subscribe" 
2) "tv1" 
3) (integer) 1 
1) "subscribe" 
2) "tv2" 
3) (integer) 2 
1) "message"   #获取了tv1发布的信息 
2) "tv1" 
3) "Hello word" 
1) "message"  #获取了tv2发布的信息 
2) "tv2" 
3) "Hello tv2"