Running a memory-efficient Redis database starts with understanding all of the memory related directives that can be set in the
redis.conf configuration file. The
redis.conf file provides a rich, inline documentation for most directives, making the sometimes complex options for memory optimization easier to understand, change, and test. Most of the Redis configuration directives can also be set at runtime using the
CONFIG SET command.
For LRU related configuration directives are part of the LRU key evictions topic in this chapter.
The first configuration directive that we'll examine that has memory trade-offs is the
rdbchecksumdirective, with the default value of yes places a cyclic redundancy check 65-bit (CRC64) checksum at the end of an RDB snapshot file as an anti-corruption measure. Performing an RDB snapshot with this CRC64 checksum imposes a 10% increase in memory usage when Redis spawns a child process that saves the snapshot in the disk.
The second configuration directive...