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Sql Federation.En

docs/document/content/user-manual/shardingsphere-jdbc/yaml-config/rules/sql-federation.en.md

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+++ title = "SQL Federation" weight = 13 +++

Background

This function is an experimental one and is currently not suitable for use in core system production environments. When multiple tables in a join query are distributed across different database instances, enabling federated query allows for cross-database join queries, as well as subqueries.

Parameters

yaml
sqlFederation:
  sqlFederationEnabled: # SQL federation enabled configuration
  allQueryUseSQLFederation: # all query use SQL federation configuration
  executionPlanCache: # execution plan cache configuration
    initialCapacity: 2000 # execution plan local cache initial capacity
    maximumSize: 65535 # execution plan local cache maximum size

Sample

yaml
sqlFederation:
  sqlFederationEnabled: true
  allQueryUseSQLFederation: false
  executionPlanCache:
    initialCapacity: 2000
    maximumSize: 65535