redis安装配置使用过程的遇到的各种问题

2019独角兽企业重金招聘Python工程师标准>>>

###1.下载安装后，如何正确的启动redis 直接双击是不好的，因为没有指定配置文件，采用默认的配置，因此最好的做法是启动的同时指定配置文件。这就不奇怪，我在Windows中修改了n遍config文件却一直不生效。更恶心的是，安装结束后由两个配置文件，还不知道哪个是，原来是启动的时候选择的。

C:\Program Files\Redis>redis-server.exe redis.windows.conf

###2.正确的配置持久化的文件名 默认是有个持久化策略的，至于具体啥问题也不去研究。我就是用来做存储的，不出问题就行。真是糟糕的学习方式，土地主一般。 在配置持久化文件的时候有两个配置项：

# The filename where to dump the DB
dbfilename db\dump.rdb

# The working directory.
#
# The DB will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
# 
# The Append Only File will also be created inside this directory.
# 
# Note that you must specify a directory here, not a file name.
dir D:\data\redis\

dbfilename真的只是文件名，不要自作多情的以为是相对路径。所以上面的做法不对。应该是：

dbfilename dump.rdb

持久化的策略，默认是这样的：

################################ 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

就是说，在900s内，一个key发生改变，则持久化到磁盘。相应的就是300s内10次改变，60s内10000次改变。所以，如果redis关掉了还是会丢东西的。比如刚刚持久化到磁盘，你写入了10个以上10000个一下的key，然后还不到300s，redi挂了，这些数据就么了。

顺便记录下持久化的日志格式：

[5948] 06 Nov 13:54:05.270 # Server started, Redis version 3.0.501
[5948] 06 Nov 13:54:05.277 * The server is now ready to accept connections on port 6379
[5948] 06 Nov 13:59:06.064 * 10 changes in 300 seconds. Saving...
[5948] 06 Nov 14:02:53.483 * Background saving started by pid 8460
[5948] 06 Nov 14:02:53.584 # fork operation complete
[5948] 06 Nov 14:02:53.585 * Background saving terminated with success

其实早就应该看备份命令

save
bgsave

###参考

• http://www.redis.net.cn/

转载于:https://my.oschina.net/ilikesss/blog/791107