数据分片
定义
Sharding Table Rule
SHOW SHARDING TABLE tableRule | RULES [FROM schemaName]
SHOW SHARDING ALGORITHMS [FROM schemaName]
tableRule:
RULE tableName
- 支持查询所有数据分片规则和指定表查询
- 支持查询所有分片算法
Sharding Binding Table Rule
SHOW SHARDING BINDING TABLE RULES [FROM schemaName]
Sharding Broadcast Table Rule
SHOW SHARDING BROADCAST TABLE RULES [FROM schemaName]
说明
Sharding Table Rule
| 列 |
说明 |
| table |
逻辑表名 |
| actual_data_nodes |
实际的数据节点 |
| actual_data_sources |
实际的数据源（通过 RDL 创建的规则时显示） |
| database_strategy_type |
数据库分片策略类型 |
| database_sharding_column |
数据库分片键 |
| database_sharding_algorithm_type |
数据库分片算法类型 |
| database_sharding_algorithm_props |
数据库分片算法参数 |
| table_strategy_type |
表分片策略类型 |
| table_sharding_column |
表分片键 |
| table_sharding_algorithm_type |
表分片算法类型 |
| table_sharding_algorithm_props |
表分片算法参数 |
| key_generate_column |
分布式主键生成列 |
| key_generator_type |
分布式主键生成器类型 |
| key_generator_props |
分布式主键生成器参数 |
Sharding Algorithms
| 列 |
说明 |
| name |
分片算法名称 |
| type |
分片算法类型 |
| props |
分片算法参数 |
Sharding Binding Table Rule
| 列 |
说明 |
| sharding_binding_tables |
绑定表名称 |
Sharding Broadcast Table Rule
| 列 |
说明 |
| sharding_broadcast_tables |
广播表名称 |
示例
Sharding Table Rule
SHOW SHARDING TABLE RULES
mysql> show sharding table rules;
+--------------+---------------------------------+-------------------+----------------------+------------------------+-------------------------------+----------------------------------------+-------------------+---------------------+----------------------------+---------------------------------------------------+-------------------+------------------+-------------------+
| table | actual_data_nodes | actual_data_sources | database_strategy_type | database_sharding_column | database_sharding_algorithm_type | database_sharding_algorithm_props | table_strategy_type | table_sharding_column | table_sharding_algorithm_type | table_sharding_algorithm_props | key_generate_column | key_generator_type | key_generator_props |
+--------------+---------------------------------+-------------------+----------------------+------------------------+-------------------------------+----------------------------------------+-------------------+---------------------+----------------------------+---------------------------------------------------+-------------------+------------------+-------------------+
| t_order | ds_${0..1}.t_order_${0..1} | | INLINE | user_id | INLINE | algorithm-expression:ds_${user_id % 2} | INLINE | order_id | INLINE | algorithm-expression:t_order_${order_id % 2} | order_id | SNOWFLAKE | worker-id:123 |
| t_order_item | ds_${0..1}.t_order_item_${0..1} | | INLINE | user_id | INLINE | algorithm-expression:ds_${user_id % 2} | INLINE | order_id | INLINE | algorithm-expression:t_order_item_${order_id % 2} | order_item_id | SNOWFLAKE | worker-id:123 |
| t2 | | ds_0,ds_1 | | | | | mod | id | mod | sharding-count:10 | | | |
+--------------+---------------------------------+-------------------+----------------------+------------------------+-------------------------------+----------------------------------------+-------------------+---------------------+----------------------------+---------------------------------------------------+-------------------+------------------+-------------------+
3 rows in set (0.02 sec)
SHOW SHARDING TABLE RULE tableName
mysql> show sharding table rule t_order;
+---------+----------------------------+-------------------+----------------------+------------------------+-------------------------------+----------------------------------------+-------------------+---------------------+----------------------------+----------------------------------------------+-------------------+------------------+-------------------+
| table | actual_data_nodes | actual_data_sources | database_strategy_type | database_sharding_column | database_sharding_algorithm_type | database_sharding_algorithm_props | table_strategy_type | table_sharding_column | table_sharding_algorithm_type | table_sharding_algorithm_props | key_generate_column | key_generator_type | key_generator_props |
+---------+----------------------------+-------------------+----------------------+------------------------+-------------------------------+----------------------------------------+-------------------+---------------------+----------------------------+----------------------------------------------+-------------------+------------------+-------------------+
| t_order | ds_${0..1}.t_order_${0..1} | | INLINE | user_id | INLINE | algorithm-expression:ds_${user_id % 2} | INLINE | order_id | INLINE | algorithm-expression:t_order_${order_id % 2} | order_id | SNOWFLAKE | worker-id:123 |
+---------+----------------------------+-------------------+----------------------+------------------------+-------------------------------+----------------------------------------+-------------------+---------------------+----------------------------+----------------------------------------------+-------------------+------------------+-------------------+
1 row in set (0.01 sec)
SHOW SHARDING ALGORITHMS
mysql> show sharding algorithms;
+-------------------------+--------+-----------------------------------------------------+
| name | type | props |
+-------------------------+--------------------------------------------------------------+
| t_order_inline | INLINE | algorithm-expression=t_order_${order_id % 2} |
| t_order_item_inline | INLINE | algorithm-expression=t_order_item_${order_id % 2} |
+-------------------------+--------+-----------------------------------------------------+
2 row in set (0.01 sec)
Sharding Binding Table Rule
mysql> show sharding binding table rules from sharding_db;
+----------------------+
| sharding_binding_tables |
+----------------------+
| t_order,t_order_item |
| t1,t2 |
+----------------------+
2 rows in set (0.00 sec)
Sharding Broadcast Table Rule
mysql> show sharding broadcast table rules;
+------------------------+
| sharding_broadcast_tables |
+------------------------+
| t_1 |
| t_2 |
+------------------------+
2 rows in set (0.00 sec)