As per the documentation, pt-table-checksum is a tool to perform online replication consistency checks by executing checksum queries on the master, which produces different results on replicas that are inconsistent with the master. The master and each slave insert checksums into the percona.checksums table, and these are later compared for differences. It’s fairly obvious that [&]

https://www.percona.com/blog/2018/11/22/caveats-pt-table-checksum-using-row-based-replication-and-filters/