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MySQL 8.4 Reference Manual / ... / The INFORMATION_SCHEMA EVENTS Table

28.3.14 INFORMATION_SCHEMA EVENTS 表

The EVENTS table provides information about Event Manager events, which are discussed in Section 27.4, “Using the Event Scheduler”.

The EVENTS table has these columns:

EVENT_CATALOG

The name of the catalog to which the event belongs. This value is always def.
EVENT_SCHEMA

The name of the schema (database) to which the event belongs.
EVENT_NAME

The name of the event.
DEFINER

The account named in the DEFINER clause (often the user who created the event), in 'user_name'@'host_name' format.
TIME_ZONE

The event time zone, which is the time zone used for scheduling the event and that is in effect within the event as it executes. The default value is SYSTEM.
EVENT_BODY

The language used for the statements in the event's DO clause. The value is always SQL.
EVENT_DEFINITION

The text of the SQL statement making up the event's DO clause; in other words, the statement executed by this event.
EVENT_TYPE

The event repetition type, either ONE TIME (transient) or RECURRING (repeating).
EXECUTE_AT

For a one-time event, this is the DATETIME value specified in the AT clause of the CREATE EVENT statement used to create the event, or of the last ALTER EVENT statement that modified the event. The value shown in this column reflects the addition or subtraction of any INTERVAL value included in the event's AT clause. For example, if an event is created using ON SCHEDULE AT CURRENT_TIMESTAMP + '1:6' DAY_HOUR, and the event was created at 2018-02-09 14:05:30, the value shown in this column would be '2018-02-10 20:05:30'. If the event's timing is determined by an EVERY clause instead of an AT clause (that is, if the event is recurring), the value of this column is NULL.
INTERVAL_VALUE

For a recurring event, the number of intervals to wait between event executions. For a transient event, the value is always NULL.
INTERVAL_FIELD

The time units used for the interval which a recurring event waits before repeating. For a transient event, the value is always NULL.
SQL_MODE

The SQL mode in effect when the event was created or altered, and under which the event executes. For the permitted values, see Section 7.1.11, “Server SQL Modes”.
STARTS

The start date and time for a recurring event. This is displayed as a DATETIME value, and is NULL if no start date and time are defined for the event. For a transient event, this column is always NULL. For a recurring event whose definition includes a STARTS clause, this column contains the corresponding DATETIME value. As with the EXECUTE_AT column, this value resolves any expressions used. If there is no STARTS clause affecting the timing of the event, this column is NULL
ENDS

For a recurring event whose definition includes a ENDS clause, this column contains the corresponding DATETIME value. As with the EXECUTE_AT column, this value resolves any expressions used. If there is no ENDS clause affecting the timing of the event, this column is NULL.
STATUS

The event status. One of ENABLED, DISABLED, or REPLICA_SIDE_DISABLED (prior to MySQL 8.2.0, this was SLAVESIDE_DISABLED, now deprecated). REPLICA_SIDE_DISABLED indicates that the creation of the event occurred on another MySQL server acting as a replication source and replicated to the current MySQL server which is acting as a replica, but the event is not presently being executed on the replica. For more information, see Section 19.5.1.16, “Replication of Invoked Features”. information.
ON_COMPLETION

One of the two values PRESERVE or NOT PRESERVE.
CREATED

The date and time when the event was created. This is a TIMESTAMP value.
LAST_ALTERED

The date and time when the event was last modified. This is a TIMESTAMP value. If the event has not been modified since its creation, this value is the same as the CREATED value.
LAST_EXECUTED

The date and time when the event last executed. This is a DATETIME value. If the event has never executed, this column is NULL.

LAST_EXECUTED indicates when the event started. As a result, the ENDS column is never less than LAST_EXECUTED.
EVENT_COMMENT

The text of the comment, if the event has one. If not, this value is empty.
ORIGINATOR

The server ID of the MySQL server on which the event was created; used in replication. This value may be updated by ALTER EVENT to the server ID of the server on which that statement occurs, if executed on a replication source. The default value is 0.
CHARACTER_SET_CLIENT

The session value of the character_set_client system variable when the event was created.
COLLATION_CONNECTION

The session value of the collation_connection system variable when the event was created.
DATABASE_COLLATION

The collation of the database with which the event is associated.

EVENTS is a nonstandard INFORMATION_SCHEMA table.
Times in the EVENTS table are displayed using the event time zone, the current session time zone, or UTC, as described in Section 27.4.4, “Event Metadata”.
For more information about REPLICA_SIDE_DISABLED and the ORIGINATOR column, see Section 19.5.1.16, “Replication of Invoked Features”.

Suppose that the user 'jon'@'ghidora' creates an event named e_daily, and then modifies it a few minutes later using an ALTER EVENT statement, as shown here:

DELIMITER |

CREATE EVENT e_daily
    ON SCHEDULE
      EVERY 1 DAY
    COMMENT 'Saves total number of sessions then clears the table each day'
    DO
      BEGIN
        INSERT INTO site_activity.totals (time, total)
          SELECT CURRENT_TIMESTAMP, COUNT(*)
            FROM site_activity.sessions;
        DELETE FROM site_activity.sessions;
      END |

DELIMITER ;

ALTER EVENT e_daily
    ENABLE;

(Note that comments can span multiple lines.)

This user can then run the following SELECT statement, and obtain the output shown:

mysql> SELECT * FROM INFORMATION_SCHEMA.EVENTS
       WHERE EVENT_NAME = 'e_daily'
       AND EVENT_SCHEMA = 'myschema'\G
*************************** 1. row ***************************
       EVENT_CATALOG: def
        EVENT_SCHEMA: myschema
          EVENT_NAME: e_daily
             DEFINER: jon@ghidora
           TIME_ZONE: SYSTEM
          EVENT_BODY: SQL
    EVENT_DEFINITION: BEGIN
        INSERT INTO site_activity.totals (time, total)
          SELECT CURRENT_TIMESTAMP, COUNT(*)
            FROM site_activity.sessions;
        DELETE FROM site_activity.sessions;
      END
          EVENT_TYPE: RECURRING
          EXECUTE_AT: NULL
      INTERVAL_VALUE: 1
      INTERVAL_FIELD: DAY
            SQL_MODE: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,
                      NO_ZERO_IN_DATE,NO_ZERO_DATE,
                      ERROR_FOR_DIVISION_BY_ZERO,
                      NO_ENGINE_SUBSTITUTION
              STARTS: 2018-08-08 11:06:34
                ENDS: NULL
              STATUS: ENABLED
       ON_COMPLETION: NOT PRESERVE
             CREATED: 2018-08-08 11:06:34
        LAST_ALTERED: 2018-08-08 11:06:34
       LAST_EXECUTED: 2018-08-08 16:06:34
       EVENT_COMMENT: Saves total number of sessions then clears the
                      table each day
          ORIGINATOR: 1
CHARACTER_SET_CLIENT: utf8mb4
COLLATION_CONNECTION: utf8mb4_0900_ai_ci
  DATABASE_COLLATION: utf8mb4_0900_ai_ci

Event information is also available from the SHOW EVENTS statement. See Section 15.7.7.19, “SHOW EVENTS Statement”. The following statements are equivalent:

SELECT
    EVENT_SCHEMA, EVENT_NAME, DEFINER, TIME_ZONE, EVENT_TYPE, EXECUTE_AT,
    INTERVAL_VALUE, INTERVAL_FIELD, STARTS, ENDS, STATUS, ORIGINATOR,
    CHARACTER_SET_CLIENT, COLLATION_CONNECTION, DATABASE_COLLATION
  FROM INFORMATION_SCHEMA.EVENTS
  WHERE table_schema = 'db_name'
  [AND column_name LIKE 'wild']

SHOW EVENTS
  [FROM db_name]
  [LIKE 'wild']

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