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ADMIN SHOW DDL [JOBS|QUERIES]

The ADMIN SHOW DDL [JOBS|QUERIES] statement shows information about running and recently completed DDL jobs.

Synopsis

AdminStmt:

AdminStmt

NumList:

NumList

WhereClauseOptional:

WhereClauseOptional

Examples

ADMIN SHOW DDL

To view the currently running DDL jobs, use ADMIN SHOW DDL:

ADMIN SHOW DDL;
mysql> ADMIN SHOW DDL;
+------------+--------------------------------------+---------------+--------------+--------------------------------------+-------+
| SCHEMA_VER | OWNER_ID                             | OWNER_ADDRESS | RUNNING_JOBS | SELF_ID                              | QUERY |
+------------+--------------------------------------+---------------+--------------+--------------------------------------+-------+
|         26 | 2d1982af-fa63-43ad-a3d5-73710683cc63 | 0.0.0.0:4000  |              | 2d1982af-fa63-43ad-a3d5-73710683cc63 |       |
+------------+--------------------------------------+---------------+--------------+--------------------------------------+-------+
1 row in set (0.00 sec)

ADMIN SHOW DDL JOBS

To view all the results in the current DDL job queue (including tasks that are running and waiting to be run) and the last ten results in the completed DDL job queue, use ADMIN SHOW DDL JOBS:

ADMIN SHOW DDL JOBS;
mysql> ADMIN SHOW DDL JOBS;
+--------+---------+--------------------+--------------+----------------------+-----------+----------+-----------+---------------------+---------------------+---------+
| JOB_ID | DB_NAME | TABLE_NAME         | JOB_TYPE     | SCHEMA_STATE         | SCHEMA_ID | TABLE_ID | ROW_COUNT | START_TIME          | END_TIME            | STATE   |
+--------+---------+--------------------+--------------+----------------------+-----------+----------+-----------+---------------------+---------------------+---------+
|     59 | test    | t1                 | add index    | write reorganization |         1 |       55 |     88576 | 2020-08-17 07:51:58 | NULL                | running |
|     60 | test    | t2                 | add index    | none                 |         1 |       57 |         0 | 2020-08-17 07:51:59 | NULL                | none    |
|     58 | test    | t2                 | create table | public               |         1 |       57 |         0 | 2020-08-17 07:41:28 | 2020-08-17 07:41:28 | synced  |
|     56 | test    | t1                 | create table | public               |         1 |       55 |         0 | 2020-08-17 07:41:02 | 2020-08-17 07:41:02 | synced  |
|     54 | test    | t1                 | drop table   | none                 |         1 |       50 |         0 | 2020-08-17 07:41:02 | 2020-08-17 07:41:02 | synced  |
|     53 | test    | t1                 | drop index   | none                 |         1 |       50 |         0 | 2020-08-17 07:35:44 | 2020-08-17 07:35:44 | synced  |
|     52 | test    | t1                 | add index    | public               |         1 |       50 |    451010 | 2020-08-17 07:34:43 | 2020-08-17 07:35:16 | synced  |
|     51 | test    | t1                 | create table | public               |         1 |       50 |         0 | 2020-08-17 07:34:02 | 2020-08-17 07:34:02 | synced  |
|     49 | test    | t1                 | drop table   | none                 |         1 |       47 |         0 | 2020-08-17 07:34:02 | 2020-08-17 07:34:02 | synced  |
|     48 | test    | t1                 | create table | public               |         1 |       47 |         0 | 2020-08-17 07:33:37 | 2020-08-17 07:33:37 | synced  |
|     46 | mysql   | stats_extended     | create table | public               |         3 |       45 |         0 | 2020-08-17 06:42:38 | 2020-08-17 06:42:38 | synced  |
|     44 | mysql   | opt_rule_blacklist | create table | public               |         3 |       43 |         0 | 2020-08-17 06:42:38 | 2020-08-17 06:42:38 | synced  |
+--------+---------+--------------------+--------------+----------------------+-----------+----------+-----------+---------------------+---------------------+---------+
12 rows in set (0.00 sec)

From the output above:

  • Job 59 is currently in progress (STATE of running). The schema state is currently in write reorganization, but will switch to public once the task is completed to note that the change can be observed publicly by user sessions. The end_time column is also NULL indicating that the completion time for the job is currently not known.

  • Job 60 is an add index job, which is currently queued waiting for job 59 to complete. When job 59 completes, the STATE of job 60 will switch to running.

  • For destructive changes such as dropping an index or dropping a table, the SCHEMA_STATE will change to none when the job is complete. For additive changes, the SCHEMA_STATE will change to public.

To limit the number of rows shown, specify a number and a where condition:

ADMIN SHOW DDL JOBS [NUM] [WHERE where_condition];
  • NUM: to view the last NUM results in the completed DDL job queue. If not specified, NUM is by default 10.
  • WHERE: to add filter conditions.

ADMIN SHOW DDL JOB QUERIES

To view the original SQL statements of the DDL job corresponding to job_id, use ADMIN SHOW DDL JOB QUERIES:

ADMIN SHOW DDL JOBS;
ADMIN SHOW DDL JOB QUERIES 51;
mysql> ADMIN SHOW DDL JOB QUERIES 51;
+--------------------------------------------------------------+
| QUERY                                                        |
+--------------------------------------------------------------+
| CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY auto_increment) |
+--------------------------------------------------------------+
1 row in set (0.02 sec)

You can only search the running DDL job corresponding to job_id within the last ten results in the DDL history job queue.

MySQL compatibility

This statement is a TiDB extension to MySQL syntax.

See also