Cassandra, etc… Google Spanner, Apache HBase, TiDB, etc… 3 75 55 25 TxnID Paint Color Amount 1324 3024 $500 1567 2023 $20 1598 1022 $33 1621 1022 $1961 1765 2023 $70 TxnID Paint Color Amount 1598 1022 $33 1621 1022 $1961 TxnID Paint Color Amount 1567 2023 $20 1765 2023 $70 TxnID Paint Color Amount 1324 3024 $500 1000~1999 2000~2999 3000~3999