from your Vitess datastore. For reference, please refer to the diagram below: Note: A VStream is distinct from a VStreamer. The former is located on the VTGate and the latter is located on the VTTablet vstream using the last vgtid that it received. Architecture/Design During a copy there will two distinct phases: 1. Copy phase: where the vstreamer is sending row data in bulk using the primary key to not a simple key-value store. It supports complex query semantics such as where clauses, JOINS, aggregation functions, and more. NoSQL datastores do not usually support transactions. Vitess supports transactions

keyspace_id. In this example, we are using 1 byte. You can use 1 or 2 bytes. With 2 bytes, 65536 distinct locations can be supported. The byte value of the country(or other location identifier) is prefixed from your Vitess datastore. For reference, please refer to the diagram below: Note: A VStream is distinct from a VStreamer. The former is located on the VTGate and the latter is located on the VTTablet not a simple key-value store. It supports complex query semantics such as where clauses, JOINS, aggregation functions, and more. NoSQL datastores do not usually support transactions. Vitess supports transactions

For reference, please refer to the diagram below: Figure 1: VStream diagram Note: A VStream is distinct from a VStreamer. The former is located on the VTGate and the latter is located on the VTTablet vstream using the last vgtid that it received. Architecture/Design During a copy there will two distinct phases: 1. Copy phase: where the vstreamer is sending row data in bulk using the primary key to not a simple key-value store. It supports complex query semantics such as where clauses, JOINS, aggregation functions, and more. NoSQL datastores do not usually support transactions. Vitess supports transactions

from your Vitess datastore. For reference, please refer to the diagram below: Note: A VStream is distinct from a VStreamer. The former is located on the VTGate and the latter is located on the VTTablet vstream using the last vgtid that it received. Architecture/Design During a copy there will two distinct phases: 1. Copy phase: where the vstreamer is sending row data in bulk using the primary key to not a simple key-value store. It supports complex query semantics such as where clauses, JOINS, aggregation functions, and more. NoSQL datastores do not usually support transactions. Vitess supports transactions

from your Vitess datastore. For reference, please refer to the diagram below: Note: A VStream is distinct from a VStreamer. The former is located on the VTGate and the latter is located on the VTTablet vstream using the last vgtid that it received. Architecture/Design During a copy there will two distinct phases: 1. Copy phase: where the vstreamer is sending row data in bulk using the primary key to not a simple key-value store. It supports complex query semantics such as where clauses, JOINS, aggregation functions, and more. NoSQL datastores do not usually support transactions. Vitess supports transactions

from your Vitess datastore. For reference, please refer to the diagram below: Note: A VStream is distinct from a VStreamer. The former is located on the VTGate and the latter is located on the VTTablet not a simple key-value store. It supports complex query semantics such as where clauses, JOINS, aggregation functions, and more. NoSQL datastores do not usually support transactions. Vitess supports transactions with those materialized tables. • Realtime rollups; The materialization expression can include aggregation expressions in which case, Vitess will create a rolled up version of the source table which can

from your Vitess datastore. For reference, please refer to the diagram below: Note: A VStream is distinct from a VStreamer. The former is located on the VTGate and the latter is located on the VTTablet not a simple key-value store. It supports complex query semantics such as where clauses, JOINS, aggregation functions, and more. NoSQL datastores do not usually support transactions. Vitess supports transactions expressions that compare columns on the outer table to the inner table in sharded keyspaces. Aggregation Vitess supports a subset of GROUP BY operations, including cross-shard operations. The VTGate servers

position. For reference, please refer to the diagram below: Note: Please note that a VStream is distinct from a VStreamer. The former is located on the VTGate and the latter is located on the VTTablet not a simple key-value store. It supports complex query semantics such as where clauses, JOINS, aggregation functions, and more. NoSQL datastores do not usually support transactions. Vitess supports transactions expressions that compare columns on the outer table to the inner table in sharded keyspaces. Aggregation Vitess supports a subset of GROUP BY operations, including cross-shard operations. The VTGate servers

set val = 1 where keyrange(1, 2) 更新多⽚片 NoPlan update music set id = 1 where id = 1 更新索引 NoPlan distinct, groupby, having, orderBy, Limit. 多⽚片合并 NoPlan SelectUnsharded SelectEqual SelectIN SelectKeyrange prefix + Body • vttable restart ? Vitess Cons • bson • cross-shard groupBy, Limit, having, distinct, orderBy, insert, delete, update. • cross-shard index • cross-shard joins • distribute transaction