Many solutions depend heavily on functionality like search-based landing pages.
## Service reliability
You should count on the reliability specified in your service level agreement (SLA). Nevertheless, as search is a central part of a solution, you should implement a graceful degradation strategy if the Search & Navigation service becomes unavailable.
Note
If Optimizely is not hosting Search & Navigation, Optimizely cannot guarantee the connection between an application and the Search & Navigation service.
## Recommendations for coping with downtime
### Leave the search-generated page sections blank
For example, a page displays a list of most watched products fetched from Optimizely Search & Navigation. If Optimizely Search & Navigation is down, display a blank list.
**Advantage**
Simple to implement.
**Disadvantage**
The site does not display the expected information.
### Implement [query caching](🔗)
**Advantages**
Relatively simple to implement.
The site works in many scenarios even if Optimizely Search & Navigation is down.
**Disadvantage**
Development effort required.
### Use [FindPagesWithCriteria](🔗) as back-up
**Advantage**
The site works even if Optimizely Search & Navigation has issues.
**Disadvantages**
It takes longer to implement.
The site is significantly slower.