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What can cause a full system cache flush - Support and Troubleshooting
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KB0793295

What can cause a full system cache flush


11214 Views Last updated : Jun 26, 2025 public Copy Permalink English (Original)
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KB Summary by Now Assist

Issue

This article explains what can cause a full system cache flush. The instance can be slow after a cache flush. This can also be translated in high response time, coupled with default semaphore exhaustion on all nodes: HTTP 429 errors (too many requests).

Release

All releases

Resolution

A full system cache flush means that all transactions have to pull their data from the database, and this makes them slower than when the cache has been rebuilt.

 

Cache flush can be triggered by, but not limited to:

a) Instance Upgrades

b) Installing Plugins

c) Deploying Update Sets

d) Making Property Changes (On Properties that don't have the 'ignore cache' check box checked)

e) Executing the link: https://[instance_name].service-now.com/cache.do

f) Instance Restarts

g) Running the script gs.cacheFlush(); on /sys.scripts.do, or business rule, or script_include...etc

 

We advise you not to perform this action during core business hours if possible.


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