Automatically Clear/flush RAM Memory Cache on linux useful for servers with limited/small memory

When the cache memories were automatically cleared, they had exhausted their daily or weekly memory restrictions?

sudo sysctl vm.drop_caches=3

thanks

It says permission denied what do i do

Sorry, but it's a dumb suggestion. What is the point of flushing cache and buffers in a forced manner, if Linux Kernel does that for you automatically in case if system needs free memory chunks for allocation? It will just take the least frequently accessed blocks from buffer/cache and repurpose them to be free again, if any processes need that. But when you're flushing the caches in a forced manner, you're undermining the whole idea of Linux memory manager cache, which prevents extra disk IO by caching appropriate blocks to memory. If you want your mysql+nginx+php services to run longer and happier, it's better to cron the periodic restart of THEM instead. So whatever bugs they might have, causing memory leaks won't be affecting you for extended periods of time

wont we do systemctl to restart apache/nginx service

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