Durability

You will see an option/argument call durability *durability appear a lot in many option of ReQL. Because it’s so common and it’s very important, I want to address it here. Durability accepts value of ‘soft’ or ‘hard’.

soft

means the writes will be acknowledge by server immdediately and data will be flushed to disk in background.

hard

The opposite of soft. The default behaviour is to acknowledge after data is written to disk. Therefore, when you don’t need the data to be consitent, such as writing a cache, or an important log, you should set durability to soft in order to increase speed