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sql-statement-admin-cancel-ddl.md

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ADMIN CANCEL DDL | TiDB SQL Statement Reference
An overview of the usage of ADMIN CANCEL DDL for the TiDB database.
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ADMIN CANCEL DDL

The ADMIN CANCEL DDL statement allows you to cancel a running DDL job. The job_id can be found by running ADMIN SHOW DDL JOBS.

The ADMIN CANCEL DDL statement also allows you to cancel a DDL job that is committed but not yet completed executing. After the cancellation, the SQL statement that executes the DDL job returns the ERROR 8214 (HY000): Cancelled DDL job error. If you cancel a DDL job that has already been completed, you will see the DDL Job:90 not found error in the RESULT column, which indicates that the job has been removed from the DDL waiting queue.

Synopsis

AdminCancelDDLStmt ::=
    'ADMIN' 'CANCEL' 'DDL' 'JOBS' NumList 

NumList ::=
    Int64Num ( ',' Int64Num )*

Examples

To cancel the currently running DDL jobs and return whether the corresponding jobs are successfully cancelled, use ADMIN CANCEL DDL JOBS:

ADMIN CANCEL DDL JOBS job_id [, job_id] ...;

If the operation fails to cancel the jobs, specific reasons are displayed.

Note:

  • Before v6.2.0, only this operation can cancel DDL jobs, and all other operations and environment changes (such as machine restart and cluster restart) cannot cancel these jobs. Starting from v6.2.0, KILL statements can also be used to cancel ongoing DDL jobs by killing them.
  • This operation can cancel multiple DDL jobs at the same time. You can get the ID of DDL jobs using the ADMIN SHOW DDL JOBS statement.
  • If the jobs you want to cancel are finished, the cancellation operation fails.

MySQL compatibility

This statement is a TiDB extension to MySQL syntax.

See also