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Update db_faq.md

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@ -40,3 +40,8 @@ RAM and will use all RAM without re-configuration. Same PageCache can be used by
machine by just opening same DB file. For example if RPCDaemon started with —datadir option - it will open db of
Erigon and will use same PageCache (if data A already in RAM because it’s hot and RPCDaemon read it - then it read it
from RAM not from Disk). Shared memory.
This also means - if you restart Erigon - PageCache will stay alive. Because it doesn’t belongs to Erigon.
After machine reboot - warmup takes ~10min - Erigon will getting faster during this time (but we don’t have special code to warmup) - Erigon will just do usual work.