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Mysql collation

DBA100DBA100 Current User Role Patron

we are migrating Percona xtraDB cluster 5.7.x to Percona xtraDB cluster  8.0.19, and we want to make sure that both server has the same collation ! 
1) can we check both side's collation?
2) if collation is different , is it possible to change collation without reinstall percona xtraDB cluster?
3) how to change collation to the same one if no need to reinstall mysql
4) if need to reinstall percona xtraDB cluster , how to make it install in the collation we want, seems only possible during bootstrap ?


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