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Description

This error indicates that MySQL could not identify a table specified within a locking clause (e.g., FOR UPDATE, LOCK TABLES). It typically occurs when the table name is misspelled, the table does not exist in the current database, or the query is executed in an incorrect database context.

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Error Message

Unresolved table name %s in locking clause.

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Known Causes

3 known causes

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Typographical Error or Case Mismatch

The table name provided in the locking clause contains a typo or does not exactly match the actual table name due to case sensitivity settings.

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Table Does Not Exist

The specified table has either not been created yet or has been dropped from the database, making it unavailable for locking.

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Incorrect Database Context

The query is being executed in a database where the specified table does not exist, and the table name is not fully qualified.

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Solutions

4 solutions available

1. Correct Table Name in LOCK TABLES Statement easy

Ensure the table name specified in the LOCK TABLES statement exactly matches the actual table name in your database.

1

Review the `LOCK TABLES` statement that is causing the error. Identify the table name that is being reported as unresolved.

2

Connect to your MySQL server using a client like the MySQL command-line client, MySQL Workbench, or a similar tool.

3

Execute a query to list all tables in the database where the unresolved table is expected to exist. Replace `your_database_name` with the actual database name.

SHOW TABLES FROM your_database_name;

4

Compare the table name from the `LOCK TABLES` statement with the output of the `SHOW TABLES` command. Correct any typos, case sensitivity issues (if your OS is case-sensitive for filenames), or missing/extra characters in the `LOCK TABLES` statement.

5

Re-execute the corrected `LOCK TABLES` statement.

LOCK TABLES `correct_table_name` READ;
-- or
LOCK TABLES `correct_table_name` WRITE;

2. Verify Database Context for LOCK TABLES easy

Ensure you are operating within the correct database context when executing `LOCK TABLES`.

1

Before executing `LOCK TABLES`, explicitly select the database using the `USE` statement. This ensures that MySQL knows which database to look for the table in.

USE your_database_name;
LOCK TABLES `your_table_name` READ;
-- or
LOCK TABLES `your_table_name` WRITE;

2

Alternatively, qualify the table name with the database name in the `LOCK TABLES` statement.

LOCK TABLES `your_database_name`.`your_table_name` READ;
-- or
LOCK TABLES `your_database_name`.`your_table_name` WRITE;

3. Check for Aliases or Views in Locking Clause medium

The error can occur if you are attempting to lock a table alias or a view, which is not directly supported by `LOCK TABLES`.

1

Examine the `LOCK TABLES` statement. If the unresolved name refers to an alias used in a previous query or a view name, this is the likely cause.

2

Identify the base table(s) that the view or alias refers to.

3

Modify the `LOCK TABLES` statement to lock the actual base table(s) instead of the alias or view.

SELECT * FROM my_view;
-- The above query might use an alias implicitly or refer to a view.
-- Instead, lock the base table:
LOCK TABLES `base_table_name` READ;

4

If you require locking for operations involving views, consider if the operation can be refactored to directly operate on the base tables. If not, you might need to manage concurrency at the application level or use row-level locking mechanisms where applicable, rather than table locks.

4. Examine Stored Procedures and Triggers advanced

Investigate stored procedures or triggers that might be executing `LOCK TABLES` with an incorrect table name.

1

If the `LOCK TABLES` statement is part of a stored procedure, trigger, or event, retrieve the source code of that object.

SHOW CREATE PROCEDURE your_procedure_name;
SHOW CREATE TRIGGER your_trigger_name;
SHOW CREATE EVENT your_event_name;

2

Carefully review the `LOCK TABLES` clause within the retrieved source code for any typos or incorrect table references. Pay attention to dynamic SQL generation if the table name is constructed programmatically.

3

Correct the table name within the stored procedure, trigger, or event definition.

4

Re-compile or re-create the stored procedure, trigger, or event with the corrected code.

DELIMITER //
CREATE PROCEDURE your_procedure_name() BEGIN
  -- corrected LOCK TABLES statement
END //
DELIMITER ;

-- or for triggers/events, use ALTER statements if applicable.

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Related Errors

5 related errors

MySQL Error 3568: Unresolved Table in Locking Clause