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Description

This error occurs when attempting to create a FEDERATED table in MySQL, but the CONNECTION string provided for the remote data source is syntactically incorrect. It indicates that the database server cannot parse the connection details, preventing the federated table from being successfully created.

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Error Message

Can't create federated table. The data source connection string '%s' is not in the correct format

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Known Causes

4 known causes

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Incorrect Connection String Syntax

The CONNECTION string for the FEDERATED table does not adhere to the required 'mysql://user:password@host:port/database_name' format.

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Missing or Malformed Components

Essential parts of the connection string, such as the username, host, port, or database name, are either omitted or improperly formatted.

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Invalid Protocol or Delimiters

The connection string uses an incorrect protocol prefix (e.g., not 'mysql://') or employs wrong delimiters for separating its components.

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Special Character Escaping Issues

Special characters within the username, password, or database name are not properly escaped, leading to parsing errors by the MySQL server.

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Solutions

3 solutions available

1. Verify Federated Connection String Syntax easy

Ensure the connection string for your federated table adheres to the required format.

1

The `connection` string for a `FEDERATED` table in MySQL must follow the format: `driver://username:password@host:port/database/table`.

2

Review the `CREATE TABLE` statement for your federated table. Pay close attention to the `CONNECTION` clause. Ensure all components (driver, username, password, host, port, database, and table name) are present and correctly formatted.

CREATE TABLE my_federated_table (
    id INT NOT NULL,
    data VARCHAR(255)
) ENGINE=FEDERATED CONNECTION='mysql://user:password@host:3306/remote_db/remote_table';
-- Check that the above connection string is valid and complete.

3

Common mistakes include missing colons, missing slashes, incorrect port numbers, or typos in hostnames or database/table names. For example, `mysql://user:pass@host/db/tbl` is incorrect. It should be `mysql://user:pass@host:3306/db/tbl` if the default port is not used or specified.

2. Check MySQL Federated Plugin and Server Configuration medium

Confirm that the FEDERATED storage engine is enabled and configured correctly on both the client and server sides.

1

On the MySQL server where you are trying to create the federated table, verify that the FEDERATED storage engine is enabled. This is typically done in the `my.cnf` or `my.ini` configuration file.

2

Locate your MySQL configuration file (e.g., `/etc/mysql/my.cnf` or `C:\ProgramData\MySQL\MySQL Server X.X\my.ini`).

3

Ensure the following line is present and uncommented under the `[mysqld]` section:

[mysqld]
federated

4

If you made changes, restart your MySQL server for them to take effect.

# On Linux/macOS:
sudo systemctl restart mysql

# On Windows:
# net stop MySQLXX
# net start MySQLXX (replace XX with your server version)

5

Also, check the `federated` variable in your MySQL server. It should be `ON`.

SHOW VARIABLES LIKE 'federated';
-- Expected output: Variable_name: federated, Value: ON

3. Test Remote Database Connectivity Independently medium

Verify that the MySQL client can connect to the remote database using the credentials and host specified in the connection string.

1

Before attempting to create the federated table, try to connect to the remote MySQL server directly from the machine where you are running the `CREATE TABLE` statement. Use the same credentials and host/port information that you intend to use for the federated table.

2

Use the `mysql` command-line client. Replace placeholders with your actual remote database details.

mysql -h <remote_host> -P <remote_port> -u <username> -p <database_name>
-- You will be prompted for the password.

3

If this connection fails, the problem lies with the remote database accessibility, firewall rules, user permissions on the remote server, or incorrect credentials, rather than the federated table syntax itself. Address these connectivity issues first.

4

Once you can successfully connect and query the remote database using the `mysql` client, re-attempt the `CREATE TABLE` statement for the federated table.

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Related Errors

5 related errors

MySQL Error 1432: Invalid Federated Table Connection