Consultant @ Pythian. ●Pager-carrying, buck stops at my team. ●OSDB Practice (MySQL/MariaDB, MongoDB, Cassandra, …). ●19 years of MySQL experience. �2 About me © The Pythian Group Inc., 2019 �3 TiDB Created

brief introduction of NewSQL 1970s 2010 2015 Present MySQL PostgreSQL Oracle DB2 ... Redis HBase Cassandra MongoDB ... Google Spanner Google F1 TiDB RDBMS NoSQL NewSQL TiDB and TiKV TiDB 执行流程: TiDB

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copies of key 7. If there were separate copies, did TiDB merge them to- gether? Some databases, like Cassandra, might pick one copy (say, [1 2 3 7]) and discard the other, on the basis of e.g. a last-modified