NoSQL Introduction to NoSQL: A new type of database (not only SQL)
- A non-relational database
- SQL syntax not supported
- The storage structure is completely different from the relational table in the traditional relational database, and the data stored in NoSQL is in kv form
- There is no universal language in the NoSQL world, and each NoSQL database has its own API and syntax, as well as a business scenario that excels
- There are quite a few types of products in NoSQL:
- Mongodb
- Redis
- Hbase Hadoop
- Cassandra Hadoop
Comparison of NoSQL and SQL databases:
- Different scenarios: SQL database is ideal for data query scenarios with particularly complex relationships, NoSQL instead
- Support for the transaction attribute: SQL supports transactions very well, and NoSQL basically does not support transactions
- The two continue to complement each other and present a trend of convergence
About Redis
- Redis is an open source API that is written in ANSI C, supports the web, can be persisted in memory, key-value databases, and provides multiple languages. From March 15, 2010 onwards, the development work of Redis is hosted by VMware. Since May 2013, the development of Redis has been sponsored by pivotal.
- Redis is a member of the NoSQL technology camp, which adapts various key-value data types to the storage needs of different scenarios, using a number of high-level interfaces that can be used to handle different roles, such as caching and queuing systems.
Redis Features
- Redis and other Key-value cache products have the following three features:
- Redis supports data persistence, which saves data in memory on disk and can be loaded again for use when restarting.
- Redis not only supports simple key-value types of data, but also provides storage of data structures such as List,set,zset,hash.
- Redis supports backup of data, that is, Master-slave mode of data backup.
Redis Benefits
- The performance is very high –redis can read the speed is 110,000 times/s, the write speed is 81,000 times/s.
- Rich data types –redis support binary case Strings, Lists, hashes, sets and Ordered sets data type operations.
- All atomic –redis operations are atomic, and Redis supports atomic execution of several operations.
- Rich features –redis also supports publish/subscribe, notifications, key expiration, and more.
Redis Application Scenarios
- All the data used to do the cache (ehcache/memcached)--redis is in memory (in-memory database)
- Can be used to replace traditional databases in certain scenarios-such as social applications
- In some large systems, the ingenious implementation of some specific functions: Session sharing, Shopping cart
- As long as you have a rich imagination, redis can be used to give you infinite surprises ....
Recommended Reading
- Redis official website
- Redis Chinese official website
Redis Installation
Step2: Unzip
Tar xzf redis-4.0.9.tar.gz
Step3: Move, put it on the usr/local?
sudo mv./redis-4.0.9/usr/local/redis/
Step4: Into a redis record
cd/usr/local/redis/
STEP5: Generate sudo make
- STEP6: Test, this time will be more? sudo make test
- STEP7: Install, install Redis commands to/usr/local/bin/? sudo make install
- STEP8: After the installation is complete, we go to the directory/usr/local/bin to view the Ls-a
-
- Redis-server Redis Server
- REDIS-CLI Redis command-line Client
- Redis-benchmark Redis Performance Testing Tool
- Redis-check-aof aof File Repair Tool
- Redis-check-rdb RDB File Retrieval Tool
-
STEP9: Configure the pieces, move to/etc/?
The configuration of the piece is recorded as/usr/local/redis/redis.conf.
sudo cp/usr/local/redis/redis.conf/etc/redis/
Install Redis on MAC:
https://brew.sh/
- Using Brew to install Redis
Https://www.cnblogs.com/cloudshadow/p/mac_brew_install_redis.html
Introduction to cache database Redis---> Installation
