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

语法 铁路图

  1. ShowDatabaseDiscoveryRule::=
  2.   'SHOW' 'DB_DISCOVERY' ('RULE' ruleName | 'RULES') ('FROM' databaseName)?
  4. ruleName ::=
  5.   identifier
  7. databaseName ::=
  8.   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
  1. SHOW DB_DISCOVERY RULES FROM discovery_db;
  1. mysql> SHOW DB_DISCOVERY RULES FROM discovery_db;
  2. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  3. | group_name | data_source_names | primary_data_source_name | discovery_type                                                                                    | discovery_heartbeat                                             |
  4. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  5. | 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 * * * * ?}} |
  6. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  7. 1 row in set (0.01 sec)
  • 查询当前逻辑库中的数据库发现规则
  1. SHOW DB_DISCOVERY RULES;
  1. mysql> SHOW DB_DISCOVERY RULES;
  2. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  3. | group_name | data_source_names | primary_data_source_name | discovery_type                                                                                    | discovery_heartbeat                                             |
  4. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  5. | 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 * * * * ?}} |
  6. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  7. 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
  1. SHOW DB_DISCOVERY RULE group_0 FROM discovery_db;
  1. mysql> SHOW DB_DISCOVERY RULE group_0 FROM discovery_db;
  2. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  3. | group_name | data_source_names | primary_data_source_name | discovery_type                                                                                    | discovery_heartbeat                                             |
  4. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  5. | 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 * * * * ?}} |
  6. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  7. 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
  1. SHOW DB_DISCOVERY RULE group_0;
  1. mysql> SHOW DB_DISCOVERY RULE group_0;
  2. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  3. | group_name | data_source_names | primary_data_source_name | discovery_type                                                                                    | discovery_heartbeat                                             |
  4. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  5. | 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 * * * * ?}} |
  6. +------------+-------------------+--------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------------------------+
  7. 1 row in set (0.03 sec)

保留字

SHOW、DB_DISCOVERY、RULE、RULES、FROM

相关链接