ALTER SHADOW RULE 语法用于修改影子库压测规则。
AlterShadowRule ::=
'ALTER' 'SHADOW' 'RULE' shadowRuleDefinition (',' shadowRuleDefinition)*
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
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 ruleName、tableName 和 shadowAlgorithmType 自动生成；shadowAlgorithmType 目前支持 VALUE_MATCH、REGEX_MATCH 和 SIMPLE_HINT。ALTER 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')))
);
ALTER、SHADOW、RULE、SOURCE、SHADOW、TYPE、NAME、PROPERTIES