Read/write Splitting #
Syntax #
SHOW READWRITE_SPLITTING RULES [FROM databaseName]
Return Value Description #
| Column | Description |
|---|---|
| name | Rule name |
| auto_aware_data_source_name | Auto-Aware discovery data source name (Display configuration dynamic readwrite splitting rules) |
| write_data_source_query_enabled | All read data source are offline, write data source whether the data source is responsible for read traffic |
| write_data_source_name | Write data source name |
| read_data_source_names | Read data source name list |
| load_balancer_type | Load balance algorithm type |
| load_balancer_props | Load balance algorithm parameter |
Example #
Static Readwrite Splitting Rules
mysql> SHOW READWRITE_SPLITTING RULES;
+------------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
| name | auto_aware_data_source_name | write_data_source_name | read_data_source_names | load_balancer_type | load_balancer_props |
+------------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
| ms_group_0 | | ds_primary | ds_slave_0, ds_slave_1 | random | |
+------------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
1 row in set (0.00 sec)
Dynamic Readwrite Splitting Rules
mysql> SHOW READWRITE_SPLITTING RULES FROM readwrite_splitting_db;
+--------------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
| name | auto_aware_data_source_name | write_data_source_query_enabled | write_data_source_name | read_data_source_names | load_balancer_type | load_balancer_props |
+--------------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
| readwrite_ds | ms_group_0 | | | | random | read_weight=2:1 |
+-------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
1 row in set (0.01 sec)
Static Readwrite Splitting Rules And Dynamic Readwrite Splitting Rules
mysql> SHOW READWRITE_SPLITTING RULES FROM readwrite_splitting_db;
+--------------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
| name | auto_aware_data_source_name | write_data_source_query_enabled | write_data_source_name | read_data_source_names | load_balancer_type | load_balancer_props |
+--------------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
| readwrite_ds | ms_group_0 | | write_ds | read_ds_0, read_ds_1 | random | read_weight=2:1 |
+-------+-----------------------------+------------------------+------------------------+--------------------+---------------------+
1 row in set (0.00 sec)