DB Discovery

Syntax

CREATE DB_DISCOVERY RULE ruleDefinition [, ruleDefinition] ...
ALTER DB_DISCOVERY RULE ruleDefinition [, ruleDefinition] ...
DROP DB_DISCOVERY RULE ruleName [, ruleName] ...
DROP DB_DISCOVERY TYPE discoveryTypeName [, discoveryTypeName] ...
DROP DB_DISCOVERY HEARTBEAT discoveryHeartbeatName [, discoveryHeartbeatName] ...
ruleDefinition:
    ruleName (storageUnits, typeDefinition, heartbeatDefinition)
storageUnits:
    STORAGE_UNITS(storageUnitName [, storageUnitName] ...)
typeDefinition:
    TYPE(NAME=typeName [, PROPERTIES([properties] )] )
heartbeatDefinition
    HEARTBEAT (PROPERTIES (properties)) 
properties:
    property [, property] ...
property:
    key=value

Parameters Explained

Notes

• discoveryType specifies the database discovery service type, ShardingSphere has built-in support for MySQL.MGR
• Duplicate ruleName will not be created
• The discoveryType and discoveryHeartbeat being used cannot be deleted
• Names with - must use " " when changing

Example

When creating a discoveryRule, create both discoveryType and discoveryHeartbeat

CREATE DB_DISCOVERY RULE db_discovery_group_0 (
STORAGE_UNITS(ds_0, ds_1, ds_2),
TYPE(NAME='MySQL.MGR',PROPERTIES('group-name'='92504d5b-6dec')),
HEARTBEAT(PROPERTIES('keep-alive-cron'='0/5 * * * * ?'))
);
ALTER DB_DISCOVERY RULE db_discovery_group_0 (
STORAGE_UNITS(ds_0, ds_1, ds_2),
TYPE(NAME='MySQL.MGR',PROPERTIES('group-name'='246e9612-aaf1')),
HEARTBEAT(PROPERTIES('keep-alive-cron'='0/5 * * * * ?'))
);
DROP DB_DISCOVERY RULE db_discovery_group_0;
DROP DB_DISCOVERY TYPE db_discovery_group_0_mgr;
DROP DB_DISCOVERY HEARTBEAT db_discovery_group_0_heartbeat;