Readwrite-Splitting

Definition

CREATE READWRITE_SPLITTING RULE readwriteSplittingRuleDefinition [, readwriteSplittingRuleDefinition] ...

ALTER READWRITE_SPLITTING RULE readwriteSplittingRuleDefinition [, readwriteSplittingRuleDefinition] ...

DROP READWRITE_SPLITTING RULE ruleName [, ruleName] ...

readwriteSplittingRuleDefinition:
    ruleName ([staticReadwriteSplittingRuleDefinition | dynamicReadwriteSplittingRuleDefinition] 
              [, loadBanlancerDefinition])

staticReadwriteSplittingRuleDefinition:
    WRITE_RESOURCE=writeResourceName, READ_RESOURCES(resourceName [, resourceName] ... )

dynamicReadwriteSplittingRuleDefinition:
    AUTO_AWARE_RESOURCE=resourceName

loadBanlancerDefinition:
    TYPE(NAME=loadBanlancerType [, PROPERTIES([algorithmProperties] )] )

algorithmProperties:
    algorithmProperty [, algorithmProperty] ...

algorithmProperty:
    key=value
  • Support the creation of static readwrite-splitting rules and dynamic readwrite-splitting rules
  • Dynamic readwrite-splitting rules rely on database discovery rules
  • loadBanlancerType specifies the load balancing algorithm type, please refer to Load Balance Algorithm
  • Duplicate ruleName will not be created

Example

// Static
CREATE READWRITE_SPLITTING RULE ms_group_0 (
WRITE_RESOURCE=write_ds,
READ_RESOURCES(read_ds_0,read_ds_1),
TYPE(NAME=random)
);

// Dynamic
CREATE READWRITE_SPLITTING RULE ms_group_1 (
AUTO_AWARE_RESOURCE=group_0,
TYPE(NAME=random,PROPERTIES(read_weight='2:1'))
);

ALTER READWRITE_SPLITTING RULE ms_group_1 (
WRITE_RESOURCE=write_ds,
READ_RESOURCES(read_ds_0,read_ds_1,read_ds_2),
TYPE(NAME=random,PROPERTIES(read_weight='2:0'))
);

DROP READWRITE_SPLITTING RULE ms_group_1;