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SHOW READWRITE_SPLITTING RULES

描述

SHOW READWRITE_SPLITTING RULES 语法用于查询指定逻辑库中的读写分离规则。

语法

ShowReadWriteSplittingRule::=
  'SHOW' 'READWRITE_SPLITTING' 'RULES' ('FROM' databaseName)?

databaseName ::=
  identifier

补充说明

  • 未指定 databaseName 时，默认是当前使用的 DATABASE。 如果也未使用 DATABASE 则会提示 No database selected。

返回值说明

列 说明
name 读写分离规则名称
auto_aware_data_source_name 自动发现数据源名称（配置动态读写分离规则显示）
write_data_source_query_enabled 读库全部下线，主库是否承担读流量
write_data_source_name 写数据源名称
read_data_source_names 读数据源名称列表
load_balancer_type 负载均衡算法类型
load_balancer_props 负载均衡算法参数

示例

  • 查询指定逻辑库中的读写分离规则
SHOW READWRITE_SPLITTING RULES FROM sharding_db;

mysql> SHOW READWRITE_SPLITTING RULES FROM sharding_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 |
+------------+-----------------------------+---------------------------------+------------------------+------------------------+--------------------+---------------------+
| ms_group_0 |                             |                                 | resource_1             | ds_0,ds_1              | random             |                     |
+------------+-----------------------------+---------------------------------+------------------------+------------------------+--------------------+---------------------+
1 row in set (0.01 sec)
  • 查询当前逻辑库中的读写分离规则
SHOW READWRITE_SPLITTING RULES;

mysql> SHOW READWRITE_SPLITTING RULES;
+------------+-----------------------------+---------------------------------+------------------------+------------------------+--------------------+---------------------+
| 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 |
+------------+-----------------------------+---------------------------------+------------------------+------------------------+--------------------+---------------------+
| ms_group_0 |                             |                                 | resource_1             | ds_0,ds_1              | random             |                     |
+------------+-----------------------------+---------------------------------+------------------------+------------------------+--------------------+---------------------+
1 row in set (0.01 sec)

保留字

SHOW、READWRITE_SPLITTING、RULES、FROM

相关链接