PXB(Percona Xtrabackup)介绍

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    Percona XtraBackup 8.0 does not support making backups of databases created in versions prior to 8.0 of MySQL , Percona Server or Percona XtraDB Cluster . As the changes that MySQL 8.0 introduced in data dictionaries , redo log and undo log are incompatible with previous versions, it is currently impossible for Percona XtraBackup 8.0 to also support versions prior to 8.0.

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