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CREATE SHADOW RULE

描述

CREATE SHADOW RULE 语法用于创建影子库压测规则。

语法定义

CreateShadowRule ::=
  'CREATE' 'SHADOW' 'RULE' ifNotExists? shadowRuleDefinition (',' shadowRuleDefinition)*

ifNotExists ::=
  'IF' 'NOT' 'EXISTS'

shadowRuleDefinition ::=
  ruleName '(' storageUnitMapping shadowTableRule (',' shadowTableRule)* ')'
    
storageUnitMapping ::=
  'SOURCE' '=' storageUnitName ',' 'SHADOW' '=' storageUnitName

shadowTableRule ::=
  tableName '(' shadowAlgorithm ')'
    
shadowAlgorithm ::=
  'TYPE' '(' 'NAME' '=' shadowAlgorithmType ',' propertiesDefinition ')'

ruleName ::=
  identifier

storageUnitName ::=
  identifier

tableName ::=
  identifier

algorithmName ::=
  identifier

shadowAlgorithmType ::=
  string

propertiesDefinition ::=
  'PROPERTIES' '(' key '=' value (',' key '=' value)* ')'

key ::=
  string

value ::=
  literal

补充说明

  • 重复的 ruleName 无法被创建;
  • storageUnitMapping 指定源数据库和影子库的映射关系,需使用 RDL 管理的 STORAGE UNIT ,请参考 存储单元
  • shadowAlgorithm 可同时作用于多个 shadowTableRule
  • algorithmName 会根据 ruleNametableNameshadowAlgorithmType 自动生成;
  • shadowAlgorithmType 目前支持 VALUE_MATCHREGEX_MATCHSIMPLE_HINT
  • ifNotExists 子句用于避免出现 Duplicate shadow rule 错误。

示例

  • 创建影子库压测规则
CREATE SHADOW RULE shadow_rule(
  SOURCE=demo_ds,
  SHADOW=demo_ds_shadow,
  t_order(TYPE(NAME="SIMPLE_HINT", PROPERTIES("shadow"="true", "foo"="bar"))), 
  t_order_item(TYPE(NAME="VALUE_MATCH", PROPERTIES("operation"="insert","column"="user_id", "value"='1')))
);
  • 使用 ifNotExists 子句创建影子库压测规则
CREATE SHADOW RULE IF NOT EXISTS shadow_rule(
  SOURCE=demo_ds,
  SHADOW=demo_ds_shadow,
  t_order(TYPE(NAME="SIMPLE_HINT", PROPERTIES("shadow"="true", "foo"="bar"))), 
  t_order_item(TYPE(NAME="VALUE_MATCH", PROPERTIES("operation"="insert","column"="user_id", "value"='1')))
);

保留字

CREATESHADOWRULESOURCESHADOWTYPENAMEPROPERTIES

相关链接