Data encoding

Using Object Cache Pro’s serializer and compression configuration options reduces Redis memory usage by up to ~76%. While that’s fantastic, enabling or changing serialization and compression requires some extra steps.

Every time the serializer or compression configuration option is changed, you must flush your entire Redis database to avoid corrupt data and crashing your site.

Staging procedure #

Since development and staging environments are more forgiving of downtime just go ahead and:

1. Change serializer / compression option
2. Run redis-cli flushdb

Production procedure #

In production environments that cannot afford downtime it’s recommended to:

1. Disable the object cache: wp redis disable
2. Run wp redis cli and then flushdb
3. Change serializer / compression option
4. Re-enable the object cache: wp redis enable