复古 护眼 海天 深邃 暗黑 默认

影子库压测

语法说明

CREATE SHADOW RULE shadowRuleDefinition [, shadowRuleDefinition] ... 

ALTER SHADOW RULE shadowRuleDefinition [, shadowRuleDefinition] ... 

CREATE SHADOW ALGORITHM shadowAlgorithm [, shadowAlgorithm] ...

ALTER SHADOW ALGORITHM shadowAlgorithm [, shadowAlgorithm] ...

DROP SHADOW RULE ruleName [, ruleName] ...

DROP SHADOW ALGORITHM algorithmName [, algorithmName] ...

CREATE DEFAULT SHADOW ALGORITHM NAME = algorithmName

shadowRuleDefinition: ruleName(resourceMapping, shadowTableRule [, shadowTableRule] ...)

resourceMapping: SOURCE=resourceName, SHADOW=resourceName

shadowTableRule: tableName(shadowAlgorithm [, shadowAlgorithm] ...)

shadowAlgorithm: ([algorithmName, ] TYPE(NAME=shadowAlgorithmType, PROPERTIES([algorithmProperties] ...)))

algorithmProperties: algorithmProperty [, algorithmProperty] ... 

algorithmProperty: key=value
  • 重复的ruleName无法被创建；
  • resourceMapping 指定源数据库和影子库的映射关系，需使用 RDL 管理的 resource ，请参考 数据源资源；
  • shadowAlgorithm 可同时作用于多个 shadowTableRule；
  • algorithmName 未指定时会根据 ruleName、tableName 和 shadowAlgorithmType 自动生成；
  • shadowAlgorithmType 目前支持 VALUE_MATCH、REGEX_MATCH 和 SIMPLE_HINT；
  • shadowTableRule 能够被不同的 shadowRuleDefinition 复用，因此在执行 DROP SHADOW RULE 时，对应的 shadowTableRule 不会被移除；
  • shadowAlgorithm 能够被不同的 shadowTableRule 复用，因此在执行 ALTER SHADOW RULE 时，对应的 shadowAlgorithm 不会被移除。

示例

CREATE SHADOW RULE shadow_rule(
SOURCE=demo_ds,
SHADOW=demo_ds_shadow,
t_order((simple_hint_algorithm, TYPE(NAME=SIMPLE_HINT, PROPERTIES("shadow"="true", foo="bar"))),(TYPE(NAME=REGEX_MATCH, PROPERTIES("operation"="insert","column"="user_id", "regex"='[1]')))), 
t_order_item((TYPE(NAME=VALUE_MATCH, PROPERTIES("operation"="insert","column"="user_id", "value"='1')))));

ALTER SHADOW RULE shadow_rule(
SOURCE=demo_ds,
SHADOW=demo_ds_shadow,
t_order((simple_hint_algorithm, TYPE(NAME=SIMPLE_HINT, PROPERTIES("shadow"="true", foo="bar"))),(TYPE(NAME=REGEX_MATCH, PROPERTIES("operation"="insert","column"="user_id", "regex"='[1]')))), 
t_order_item((TYPE(NAME=VALUE_MATCH, PROPERTIES("operation"="insert","column"="user_id", "value"='1')))));

CREATE SHADOW ALGORITHM 
(simple_hint_algorithm, TYPE(NAME=SIMPLE_HINT, PROPERTIES("shadow"="true", "foo"="bar"))), 
(user_id_match_algorithm, TYPE(NAME=REGEX_MATCH,PROPERTIES("operation"="insert", "column"="user_id", "regex"='[1]')));


ALTER SHADOW ALGORITHM 
(simple_hint_algorithm, TYPE(NAME=SIMPLE_HINT, PROPERTIES("shadow"="false", "foo"="bar"))), 
(user_id_match_algorithm, TYPE(NAME=VALUE_MATCH,PROPERTIES("operation"="insert", "column"="user_id", "value"='1')));

DROP SHADOW RULE shadow_rule;

DROP SHADOW ALGORITHM simple_hint_algorithm;

CREATE DEFAULT SHADOW ALGORITHM NAME = simple_hint_algorithm;