EC
1456
MySQLERRORNotableDDLHIGH confidence

Cannot create FEDERATED table — connection string format is invalid

Production Risk

Low — DDL error; the table will not be created.

What this means

ER_FOREIGN_DATA_STRING_INVALID_CANT_CREATE (1456, SQLSTATE HY000) is raised when the CONNECTION string for a FEDERATED table is syntactically invalid.

Why it happens
  1. 1Missing required components in the CONNECTION string (host, user, database, or table)
  2. 2Incorrect URL format for the FEDERATED connection string
How to reproduce
trigger — this will error
trigger — this will error
CREATE TABLE fed_table (id INT)
ENGINE=FEDERATED
CONNECTION='invalid-format-string';

expected output

ERROR 1456 (HY000): Can't create federated table. The data source connection string 'invalid-format-string' is not in the correct format

Fix

Use the correct CONNECTION string format

Use the correct CONNECTION string format
CREATE TABLE fed_table (id INT, name VARCHAR(100))
ENGINE=FEDERATED
CONNECTION='mysql://username:password@hostname:3306/database/tablename';

Why this works

The FEDERATED connection string must follow the format: mysql://user:pass@host:port/db/table

Sources
Official documentation ↗

MySQL 8.0 — 1456 ER_FOREIGN_DATA_STRING_INVALID_CANT_CREATE

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