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SHOW DB_DISCOVERY RULE

描述

SHOW DB_DISCOVERY RULE 语法用于查询指定逻辑库中的指定数据库发现规则。

语法

ShowDatabaseDiscoveryRule::=
  'SHOW' 'DB_DISCOVERY' ('RULE' ruleName | 'RULES') ('FROM' databaseName)?

ruleName ::=
  identifier

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
group_name 数据库发现规则名称
data_source_names 数据源名称列表
primary_data_source_name 主数据源名称
discovery_type 数据库发现服务类型
discovery_heartbeat 数据库发现服务心跳

示例

  • 查询指定逻辑库中的数据库发现规则
SHOW DB_DISCOVERY RULES FROM discovery_db;

mysql> SHOW DB_DISCOVERY RULES FROM discovery_db;
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
| group_name | data_source_names | primary_data_source_name | discovery_type                                                                                    | discovery_heartbeat                                             |
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
| group_0    | ds_0,ds_1,ds_2    | ds_0                     | {name=group_0_MySQL.MGR, type=MySQL.MGR, props={group-name=558edd3c-02ec-11ea-9bb3-080027e39bd2}} | {name=group_0_heartbeat, props={keep-alive-cron=0/5 * * * * ?}} |
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
1 row in set (0.01 sec)
  • 查询当前逻辑库中的数据库发现规则
SHOW DB_DISCOVERY RULES;

mysql> SHOW DB_DISCOVERY RULES;
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
| group_name | data_source_names | primary_data_source_name | discovery_type                                                                                    | discovery_heartbeat                                             |
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
| group_0    | ds_0,ds_1,ds_2    | ds_0                     | {name=group_0_MySQL.MGR, type=MySQL.MGR, props={group-name=558edd3c-02ec-11ea-9bb3-080027e39bd2}} | {name=group_0_heartbeat, props={keep-alive-cron=0/5 * * * * ?}} |
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
1 row in set (0.03 sec)
  • 查询指定逻辑库中的指定数据库发现规则
SHOW DB_DISCOVERY RULE group_0 FROM discovery_db;

mysql> SHOW DB_DISCOVERY RULE group_0 FROM discovery_db;
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
| group_name | data_source_names | primary_data_source_name | discovery_type                                                                                    | discovery_heartbeat                                             |
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
| group_0    | ds_0,ds_1,ds_2    | ds_0                     | {name=group_0_MySQL.MGR, type=MySQL.MGR, props={group-name=558edd3c-02ec-11ea-9bb3-080027e39bd2}} | {name=group_0_heartbeat, props={keep-alive-cron=0/5 * * * * ?}} |
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
1 row in set (0.01 sec)
  • 查询当前逻辑库中的指定数据库发现规则
SHOW DB_DISCOVERY RULE group_0;

mysql> SHOW DB_DISCOVERY RULE group_0;
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
| group_name | data_source_names | primary_data_source_name | discovery_type                                                                                    | discovery_heartbeat                                             |
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
| group_0    | ds_0,ds_1,ds_2    | ds_0                     | {name=group_0_MySQL.MGR, type=MySQL.MGR, props={group-name=558edd3c-02ec-11ea-9bb3-080027e39bd2}} | {name=group_0_heartbeat, props={keep-alive-cron=0/5 * * * * ?}} |
+------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
1 row in set (0.03 sec)

保留字

SHOW、DB_DISCOVERY、RULE、RULES、FROM

相关链接