React Query Tutorial in Hindi #8 Why should cacheTime be bigger than staleTime in React Query
0const { data } = useQuery(['my-data'], fetchMyData, {
staleTime: 10 * (60 * 1000), // 10 mins
});
Why should cacheTime be bigger than staleTime in React Query
CacheTime should be bigger than staleTime because you don't want to make unnecessary network requests. If the cacheTime is smaller than the staleTime, then React Query will re-fetch the data from the server even if the data in the cache is still fresh. This can waste bandwidth and time.
The difference between cacheTime and staleTime is as follows:
CacheTime is the duration until inactive queries will be removed from the cache. This defaults to 5 minutes. Queries transition to the inactive state as soon as there are no observers registered, so when all components which use that query have unmounted.
StaleTime is the duration until a query transitions from fresh to stale. As long as the query is fresh, data will always be read from the cache only. If the query is stale, then a new request will be made to the server for the data. The default value for staleTime is 0, which means that data is never considered fresh.
So, if you set cacheTime to 10 minutes and staleTime to 5 minutes, then React Query will only re-fetch the data from the server if the cache has been inactive for 5 minutes or more. If the cache has been active for less than 5 minutes, then React Query will use the data from the cache, even if it is stale.
Ultimately, the best way to set cacheTime and staleTime is to experiment and see what works best for your application.
cacheTime vs staleTime
cacheTime is the duration React Query stores inactive data before it is deleted from the cache
cacheTime defaults to 5 minutes
staleTime is the duration data is considered fresh - once it's stale any new calls to the query will trigger a re-fetch from the server
staleTime defaults to 0
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