Redis persistence technology and its application in the Java class library

Redis is an open source memory data structure storage system that is widely used in large -scale Internet applications.In order to ensure the durability of data, Redis provides a variety of persistent technologies, including RDB (Redis database) and AOF (APPEND only file).This article will introduce the persistence technology of Redis and give examples to apply these technologies in the Java class library. 1. RDB persistence technology RDB is the default persistence technology of Redis, which achieves persistence by writing data in the current memory in the form of snapshots.The RDB file is a binary file that contains all the data of Redis.Compared to AOF, RDB persistence technology is faster in data recovery, and the generated files are more compact, occupying less disk space. The following is an example code that uses RDB persistence technology in the Java library: First, we need to introduce the Jedis library: import redis.clients.jedis.Jedis; Next, connect to the Redis server: Jedis jedis = new Jedis("localhost", 6379); In order to write the data in the memory to the disk, we can use the `save () method: jedis.save(); This will trigger Redis to save the current data as an RDB file. 2. AOF persistence technology AOF persistence technology achieved data persistence by adding writing operations to an additional file.The file is represented by text, including a series of commands of writing operations and all data required to restore the database. The following is an example code that uses AOF persistence technology in the Java library: First, we need to introduce the Jedis library: import redis.clients.jedis.Jedis; Next, connect to the Redis server: Jedis jedis = new Jedis("localhost", 6379); In order to start the AOF persistence mode, we can use the `Configset () method: jedis.configSet("appendonly", "yes"); This will open the AOF persistence mode on the Redis server. If you need to add the writing operation to the AOF file, we can use the `APPEND () method: jedis.append("key", "value"); This will be added to the AOF file. In summary, Redis provides two persistent technologies: RDB and AOF to meet the durable needs of different data.Whether it is RDB or AOF, it can be easily applied and managed in the Java class library.By example code, we can better understand how to use these persistent technologies to ensure the durability of Redis data.