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When changing SQL server 2017 enterprise edition license model

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Last Modified: 2021-02-22
Hi,

I found out that SQL server 2017 only use 20 core on the primary replica in AG, as it is a Server + CAL model so by design it only use 20 Cores!

and I read this :

https://www.sqlservercentral.com/blogs/how-to-change-sql-server-license-or-product-key
https://docs.microsoft.com/en-us/sql/database-engine/install-windows/upgrade-to-a-different-edition-of-sql-server-setup?view=sql-server-ver15

We need installation media for it and do you know if changing SQL server license key need rebooting the SQL server?
 
should I just need to do it on one of the AG node only ?

and MUST I do it in passive node in secondary replica in AG only ?

is there any perfmon counter to see how heathy is the AG replication between primary and secondary replica ?
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