当前Redis版本6.2.4
Redis提供了两种不同形式的持久化方式。
- RDB(Redis DataBase)
- AOF(Append Of File
一.RDB（Redis DataBase）
RDB:在指定的时间间隔内将内存中的数据集快照写入磁盘,也就是行话讲的Snapshot快照，它恢复时是将快照文件直接读到内存里。
在配置文件中有关RDB快照的配置
################################ SNAPSHOTTING ################################ # Save the DB to disk. //将数据库保存到磁盘 # # save <seconds> <changes> # # Redis will save the DB if both the given number of seconds and the given //如果给定的描述和给定的写操作数都达到给定值，Redis将保存数据库。 # number of write operations against the DB occurred. # # Snapshotting can be completely disabled with a single empty string argument //使用一个空字符串参数可以完全禁用快照 # as in following example: # # save "" //使用空字符完全禁用快照 # # Unless specified otherwise, by default Redis will save the DB: //除非另有规定，默认情况下Redis将保存数据库 # * After 3600 seconds (an hour) if at least 1 key changed //3600秒（一小时）后，如果至少有一个key发生了变化 # * After 300 seconds (5 minutes) if at least 100 keys changed //300秒（5分钟）后，如果至少更改了100个键 # * After 60 seconds if at least 10000 keys changed # # You can set these explicitly by uncommenting the three following lines. # # save 3600 1 # save 300 100 # save 60 10000 # By default Redis will stop accepting writes if RDB snapshots are enabled # (at least one save point) and the latest background save failed. # This will make the user aware (in a hard way) that data is not persisting # on disk properly, otherwise chances are that no one will notice and some # disaster will happen. # # If the background saving process will start working again Redis will # automatically allow writes again. # # However if you have setup your proper monitoring of the Redis server # and persistence, you may want to disable this feature so that Redis will # continue to work as usual even if there are problems with disk, # permissions, and so forth. stop-writes-on-bgsave-error yes # Compress string objects using LZF when dump .rdb databases? # By default compression is enabled as it's almost always a win. # If you want to save some CPU in the saving child set it to 'no' but # the dataset will likely be bigger if you have compressible values or keys. rdbcompression yes # Since version 5 of RDB a CRC64 checksum is placed at the end of the file. # This makes the format more resistant to corruption but there is a performance # hit to pay (around 10%) when saving and loading RDB files, so you can disable it # for maximum performances. # # RDB files created with checksum disabled have a checksum of zero that will # tell the loading code to skip the check. rdbchecksum yes # Enables or disables full sanitation checks for ziplist and listpack etc when # loading an RDB or RESTORE payload. This reduces the chances of a assertion or # crash later on while processing commands. # Options: # no - Never perform full sanitation # yes - Always perform full sanitation # clients - Perform full sanitation only for user connections. # Excludes: RDB files, RESTORE commands received from the master # connection, and client connections which have the # skip-sanitize-payload ACL flag. # The default should be 'clients' but since it currently affects cluster # resharding via MIGRATE, it is temporarily set to 'no' by default. # # sanitize-dump-payload no # The filename where to dump the DB dbfilename "dump.rdb" # Remove RDB files used by replication in instances without persistence # enabled. By default this option is disabled, however there are environments # where for regulations or other security concerns, RDB files persisted on # disk by masters in order to feed replicas, or stored on disk by replicas # in order to load them for the initial synchronization, should be deleted # ASAP. Note that this option ONLY WORKS in instances that have both AOF # and RDB persistence disabled, otherwise is completely ignored. # # An alternative (and sometimes better) way to obtain the same effect is # to use diskless replication on both master and replicas instances. However # in the case of replicas, diskless is not always an option. rdb-del-sync-files no # 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 "/usr/local/redis-6.2.4/bin"