Redis has made literacy permanent

column 2020-11-07 18:55:58
redis literacy permanent


Talk a lot

Now the interview requirements are becoming more and more difficult , I would like to interview the development post after graduation if you would use Redis , In the interviewer's mind will feel , Ouch! , You're good , It's a bonus . current Redis Become a necessary skill for developers , If you haven't used or can't use the interview Redis, Then you can really be dissuaded . Keep learning new technology , Maybe it's the fate of developers .

Persistence

Redis Can be used for caching , Also belong to NoSQL database , So it also supports data persistence ,Redis The database supports two persistence schemes :

  1. RDB snapshot
  2. AOF journal
  3. Mix persistence

RDB

Configuration parameters

redis.conf The main configuration involved

#1、 Automatic backup rules ( If a condition is met, the backup action will be triggered )
save 900 1 # every other 900 Second has 1 The next change triggers 
save 300 10 # every other 300 Second has 10 The next change triggers 
save 60 10000 # every other 60 Second has 10000 The next change triggers 
#2、 Whether to prohibit the client from writing after the snapshot backup error occurs , The default is yes
stop-writes-on-bgsave-error yes
#3、 Whether to compress the snapshot file , Default yes
rdbcompression yes
#4、 Whether the RDB Check the file , Default yes
rdbchecksum yes
#5、 Define generated RDB file name , Default dump.rdb
dbfilename dump.rdb
#6、 Definition generation RDB File directory , The default is to start Redis Directory of services 
dir ./

Just installed Redis, This persistence mode is enabled by default , A backup will be made in the directory where the service is started dump.rdb file ,Redis This file will be automatically loaded to restore the backup data when starting .

Backup

  1. We can go through Redis Client sends command save Manually backup a snapshot of the current data , however save It's a blocking command , When the backup file is too large , When the backup operation is not completed , Other operation commands received during this period will be suspended . So it's not recommended save, This is when bgsave, See the name and know the meaning , It will fork A child process to handle the backup operation , Does not affect the main process processing client request command .
  2. Trigger the configured automatic backup policy , Automatically bgsave.
  3. perform shutdown command , Will trigger save command , The service will not be shut down until the backup is completed .
  4. When setting up master-slave replication , After the slave is connected to the host , Will automatically send a sync Synchronization command , The host received a command after , First, execute bgsave Snapshot backup of data , Then it sends the snapshot data to the slave for synchronization .

AOF

Configuration parameters

#1、 Turn on aof To configure , Default no
appendonly yes
#2、 Define generated AOF file name 
appendfilename "appendonly.aof"
# 3、 Automatic backup rules ( Choose one )
# appendfsync always # Every change is backed up 
appendfsync everysec # Back up every second 
# appendfsync no # The operating system automatically schedules disk swiping 
#4、 whether aof The synchronization operation continues while the file is compressed , Default no
no-appendfsync-on-rewrite no
#4、 Define when aof The file size is larger than that of the last rewrite aof What percentage of the file size , Rewrite it again 
auto-aof-rewrite-percentage 100
#5、 If it hasn't been rewritten before , It is based on the aof Based on size , Simultaneous requirements aof The file should be at least larger than 64M
auto-aof-rewrite-min-size 64mb

Default AOF It's not turned on ,AOF Persistence is the addition of executed commands to AOF At the end of the file , During data recovery, execute the command from the beginning to the end Use AOF Way to do persistence , You can put RDB The strategy for persistence is annotated out

save ""
#save 900 1
#save 300 10
#save 60 10000

Mix persistence

This function is Redis4 After that, I added , To be honest, I just learned about it the other day , Not much contact , Here is a brief introduction , If you want to go deeper, you will be disappointed , Go out and turn left and go straight ......

Configuration parameters

aof-use-rdb-preamble yes

Backup

Set to... By the above parameters yes To open , When data is written, the data is first written as RDB At the beginning of the file , And then the following orders will be AOF The format is appended to the file , This is the introduction of RDB The advantages of fast data recovery and AOF Advantages of low risk of data loss .

Redis Part of the mind map

If the picture is not clear , And no. charmsongo reply Redis obtain

If there is anything wrong, please identify , Thank you in advance

版权声明
本文为[column]所创,转载请带上原文链接,感谢

  1. 【计算机网络 12(1),尚学堂马士兵Java视频教程
  2. 【程序猿历程,史上最全的Java面试题集锦在这里
  3. 【程序猿历程(1),Javaweb视频教程百度云
  4. Notes on MySQL 45 lectures (1-7)
  5. [computer network 12 (1), Shang Xuetang Ma soldier java video tutorial
  6. The most complete collection of Java interview questions in history is here
  7. [process of program ape (1), JavaWeb video tutorial, baidu cloud
  8. Notes on MySQL 45 lectures (1-7)
  9. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  10. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  11. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  12. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  13. 【递归,Java传智播客笔记
  14. [recursion, Java intelligence podcast notes
  15. [adhere to painting for 386 days] the beginning of spring of 24 solar terms
  16. K8S系列第八篇(Service、EndPoints以及高可用kubeadm部署)
  17. K8s Series Part 8 (service, endpoints and high availability kubeadm deployment)
  18. 【重识 HTML (3),350道Java面试真题分享
  19. 【重识 HTML (2),Java并发编程必会的多线程你竟然还不会
  20. 【重识 HTML (1),二本Java小菜鸟4面字节跳动被秒成渣渣
  21. [re recognize HTML (3) and share 350 real Java interview questions
  22. [re recognize HTML (2). Multithreading is a must for Java Concurrent Programming. How dare you not
  23. [re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds
  24. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  25. RPC 1: how to develop RPC framework from scratch
  26. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  27. RPC 1: how to develop RPC framework from scratch
  28. 一次性捋清楚吧,对乱糟糟的,Spring事务扩展机制
  29. 一文彻底弄懂如何选择抽象类还是接口,连续四年百度Java岗必问面试题
  30. Redis常用命令
  31. 一双拖鞋引发的血案,狂神说Java系列笔记
  32. 一、mysql基础安装
  33. 一位程序员的独白:尽管我一生坎坷,Java框架面试基础
  34. Clear it all at once. For the messy, spring transaction extension mechanism
  35. A thorough understanding of how to choose abstract classes or interfaces, baidu Java post must ask interview questions for four consecutive years
  36. Redis common commands
  37. A pair of slippers triggered the murder, crazy God said java series notes
  38. 1、 MySQL basic installation
  39. Monologue of a programmer: despite my ups and downs in my life, Java framework is the foundation of interview
  40. 【大厂面试】三面三问Spring循环依赖,请一定要把这篇看完(建议收藏)
  41. 一线互联网企业中,springboot入门项目
  42. 一篇文带你入门SSM框架Spring开发,帮你快速拿Offer
  43. 【面试资料】Java全集、微服务、大数据、数据结构与算法、机器学习知识最全总结,283页pdf
  44. 【leetcode刷题】24.数组中重复的数字——Java版
  45. 【leetcode刷题】23.对称二叉树——Java版
  46. 【leetcode刷题】22.二叉树的中序遍历——Java版
  47. 【leetcode刷题】21.三数之和——Java版
  48. 【leetcode刷题】20.最长回文子串——Java版
  49. 【leetcode刷题】19.回文链表——Java版
  50. 【leetcode刷题】18.反转链表——Java版
  51. 【leetcode刷题】17.相交链表——Java&python版
  52. 【leetcode刷题】16.环形链表——Java版
  53. 【leetcode刷题】15.汉明距离——Java版
  54. 【leetcode刷题】14.找到所有数组中消失的数字——Java版
  55. 【leetcode刷题】13.比特位计数——Java版
  56. oracle控制用户权限命令
  57. 三年Java开发,继阿里,鲁班二期Java架构师
  58. Oracle必须要启动的服务
  59. 万字长文!深入剖析HashMap,Java基础笔试题大全带答案
  60. 一问Kafka就心慌?我却凭着这份,图灵学院vip课程百度云