Rechercher dans le manuel MySQL
24.4.4 Event Metadata
Metadata about events can be obtained as follows:
Query the
EVENTS
table of theINFORMATION_SCHEMA
database. See Section 25.10, “The INFORMATION_SCHEMA EVENTS Table”.Use the
SHOW CREATE EVENT
statement. See Section 13.7.6.7, “SHOW CREATE EVENT Syntax”.Use the
SHOW EVENTS
statement. See Section 13.7.6.18, “SHOW EVENTS Syntax”.
Event Scheduler Time Representation
Each session in MySQL has a session time zone (STZ). This is the
session time_zone
value that is
initialized from the server's global
time_zone
value when the session
begins but may be changed during the session.
The session time zone that is current when a
CREATE EVENT
or
ALTER EVENT
statement executes is
used to interpret times specified in the event definition. This
becomes the event time zone (ETZ); that is, the time zone that is
used for event scheduling and is in effect within the event as it
executes.
For representation of event information in the
mysql.event
table, the
execute_at
, starts
, and
ends
times are converted to UTC and stored
along with the event time zone. This enables event execution to
proceed as defined regardless of any subsequent changes to the
server time zone or daylight saving time effects. The
last_executed
time is also stored in UTC.
If you select information from mysql.event
, the
times just mentioned are retrieved as UTC values. These times can
also be obtained by selecting from the
INFORMATION_SCHEMA.EVENTS
table or
from SHOW EVENTS
, but they are
reported as ETZ values. Other times available from these sources
indicate when an event was created or last altered; these are
displayed as STZ values. The following table summarizes
representation of event times.
Value | mysql.event |
INFORMATION_SCHEMA.EVENTS |
SHOW EVENTS |
---|---|---|---|
Execute at | UTC | ETZ | ETZ |
Starts | UTC | ETZ | ETZ |
Ends | UTC | ETZ | ETZ |
Last executed | UTC | ETZ | n/a |
Created | STZ | STZ | n/a |
Last altered | STZ | STZ | n/a |
Document created the 26/06/2006, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/mysql-rf-events-metadata.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.