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call mtr.add_suppression("Column count of mysql.event is wrong. Expected .*, found .*\. The table is probably corrupted"); drop database if exists events_test; drop database if exists db_x; drop database if exists mysqltest_db2; drop database if exists mysqltest_no_such_database; create database events_test; use events_test; CREATE USER pauline@localhost; CREATE DATABASE db_x; GRANT EVENT ON db_x.* TO pauline@localhost; USE db_x; CREATE TABLE x_table(a int); CREATE EVENT e_x1 ON SCHEDULE EVERY 1 SECOND DO DROP DATABASE db_x; CREATE EVENT e_x2 ON SCHEDULE EVERY 1 SECOND DO DROP TABLE x_table; SHOW DATABASES LIKE 'db_x'; Database (db_x) db_x SET GLOBAL event_scheduler=1; SHOW DATABASES LIKE 'db_x'; Database (db_x) db_x SHOW TABLES FROM db_x; Tables_in_db_x x_table SET GLOBAL event_scheduler=off; DROP EVENT e_x1; DROP EVENT e_x2; DROP DATABASE db_x; DROP USER pauline@localhost; USE events_test; SET GLOBAL event_scheduler=off; drop event if exists event1; Warnings: Note 1305 Event event1 does not exist create event event1 on schedule every 15 minute starts now() ends date_add(now(), interval 5 hour) DO begin end; alter event event1 rename to event2 enable; alter event event2 disable; alter event event2 enable; alter event event2 on completion not preserve; alter event event2 on schedule every 1 year on completion preserve rename to event3 comment "new comment" do begin select 1; end__ alter event event3 rename to event2; drop event event2; create event event2 on schedule every 2 second starts now() ends date_add(now(), interval 5 hour) comment "some" DO begin end; drop event event2; CREATE EVENT event_starts_test ON SCHEDULE EVERY 10 SECOND COMMENT "" DO SELECT 1; SELECT interval_field, interval_value, body FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; interval_field interval_value body SECOND 10 SELECT 1 SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 1 0 1 ALTER EVENT event_starts_test ON SCHEDULE AT date_add(now(), interval 5 day); SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 0 1 1 ALTER EVENT event_starts_test COMMENT "non-empty comment"; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 0 1 1 non-empty comment ALTER EVENT event_starts_test COMMENT ""; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 0 1 1 DROP EVENT event_starts_test; CREATE EVENT event_starts_test ON SCHEDULE EVERY 20 SECOND STARTS date_add(now(), interval 5 day) ENDS date_add(now(), interval 10 day) DO SELECT 2; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 1 0 0 ALTER EVENT event_starts_test COMMENT "non-empty comment"; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 1 0 0 non-empty comment ALTER EVENT event_starts_test COMMENT ""; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 1 0 0 DROP EVENT event_starts_test; create table test_nested(a int); create event e_43 on schedule every 1 second do set @a = 5; alter event e_43 do alter event e_43 do set @a = 4; ERROR HY000: Recursion of EVENT DDL statements is forbidden when body is present alter event e_43 do begin alter event e_43 on schedule every 5 minute; insert into test_nested values(1); end| set global event_scheduler = on; select db, name, body, status, interval_field, interval_value from mysql.event; db name body status interval_field interval_value events_test e_43 begin alter event e_43 on schedule every 5 minute; insert into test_nested values(1); end ENABLED MINUTE 5 drop event e_43; drop table test_nested; "Let's check whether we can use non-qualified names" create table non_qualif(a int); create event non_qualif_ev on schedule every 10 minute do insert into non_qualif values (800219); select * from non_qualif; a 800219 drop event non_qualif_ev; drop table non_qualif; alter event non_existant rename to non_existant_too; ERROR HY000: Unknown event 'non_existant' set global event_scheduler = off; create event existant on schedule at now() + interval 1 year do select 12; alter event non_existant rename to existant; ERROR HY000: Event 'existant' already exists alter event existant rename to events_test.existant; ERROR HY000: Same old and new event name drop event existant; create table t_event3 (a int, b float); drop event if exists event3; Warnings: Note 1305 Event event3 does not exist create event event3 on schedule every 50 + 10 minute starts date_add(curdate(), interval 5 minute) ends date_add(curdate(), interval 5 day) comment "portokala_comment" DO insert into t_event3 values (unix_timestamp(), rand()); select count(*) from t_event3; count(*) 0 drop event event3; drop table t_event3; set names utf8; CREATE EVENT root6 ON SCHEDULE EVERY '10:20' MINUTE_SECOND ON COMPLETION PRESERVE ENABLE COMMENT 'some comment' DO select 1; SHOW CREATE EVENT root6; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root6 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root6` ON SCHEDULE EVERY '10:20' MINUTE_SECOND STARTS '#' ON COMPLETION PRESERVE ENABLE COMMENT 'some comment' DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root7 on schedule every 2 year do select 1; SHOW CREATE EVENT root7; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root7 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root7` ON SCHEDULE EVERY 2 YEAR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root8 on schedule every '2:5' year_month do select 1; SHOW CREATE EVENT root8; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root8 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root8` ON SCHEDULE EVERY '2-5' YEAR_MONTH STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root8_1 on schedule every '2:15' year_month do select 1; SHOW CREATE EVENT root8_1; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root8_1 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root8_1` ON SCHEDULE EVERY '3-3' YEAR_MONTH STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root9 on schedule every 2 week ON COMPLETION PRESERVE DISABLE COMMENT 'коментар на кирилица' do select 1; SHOW CREATE EVENT root9; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root9 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root9` ON SCHEDULE EVERY 2 WEEK STARTS '#' ON COMPLETION PRESERVE DISABLE COMMENT 'коментар на кирилица' DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root10 on schedule every '20:5' day_hour do select 1; SHOW CREATE EVENT root10; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root10 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root10` ON SCHEDULE EVERY '20 5' DAY_HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root11 on schedule every '20:25' day_hour do select 1; SHOW CREATE EVENT root11; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root11 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root11` ON SCHEDULE EVERY '21 1' DAY_HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root12 on schedule every '20:25' hour_minute do select 1; SHOW CREATE EVENT root12; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root12 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root12` ON SCHEDULE EVERY '20:25' HOUR_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root13 on schedule every '25:25' hour_minute do select 1; SHOW CREATE EVENT root13; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root13 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root13` ON SCHEDULE EVERY '25:25' HOUR_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root13_1 on schedule every '11:65' hour_minute do select 1; SHOW CREATE EVENT root13_1; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root13_1 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root13_1` ON SCHEDULE EVERY '12:5' HOUR_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root14 on schedule every '35:35' minute_second do select 1; SHOW CREATE EVENT root14; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root14 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root14` ON SCHEDULE EVERY '35:35' MINUTE_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root15 on schedule every '35:66' minute_second do select 1; SHOW CREATE EVENT root15; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root15 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root15` ON SCHEDULE EVERY '36:6' MINUTE_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root16 on schedule every '35:56' day_minute do select 1; SHOW CREATE EVENT root16; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root16 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root16` ON SCHEDULE EVERY '1 11:56' DAY_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root17 on schedule every '35:12:45' day_minute do select 1; SHOW CREATE EVENT root17; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root17 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root17` ON SCHEDULE EVERY '35 12:45' DAY_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root17_1 on schedule every '35:25:65' day_minute do select 1; SHOW CREATE EVENT root17_1; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root17_1 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root17_1` ON SCHEDULE EVERY '36 2:5' DAY_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root18 on schedule every '35:12:45' hour_second do select 1; SHOW CREATE EVENT root18; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root18 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root18` ON SCHEDULE EVERY '35:12:45' HOUR_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root19 on schedule every '15:59:85' hour_second do select 1; SHOW CREATE EVENT root19; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root19 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root19` ON SCHEDULE EVERY '16:0:25' HOUR_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci create event root20 on schedule every '50:20:12:45' day_second do select 1; SHOW CREATE EVENT root20; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation root20 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `root20` ON SCHEDULE EVERY '50 20:12:45' DAY_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 utf8 utf8_general_ci latin1_swedish_ci set names cp1251; create event ����21 on schedule every '50:23:59:95' day_second COMMENT '���� � 1251 ��������' do select 1; SHOW CREATE EVENT ����21; Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation ����21 NO_ENGINE_SUBSTITUTION SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `руут21` ON SCHEDULE EVERY '51 0:0:35' DAY_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE COMMENT 'това е 1251 коментар' DO select 1 cp1251 cp1251_general_ci latin1_swedish_ci insert into mysql.event ( db, name, body, definer, interval_value, interval_field, originator, character_set_client, collation_connection, db_collation, body_utf8) values ( database(), "root22", "select 1", user(), 100, "SECOND_MICROSECOND", 1, 'utf8', 'utf8_general_ci', 'utf8_general_ci', 'select 1'); show create event root22; ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND' SHOW EVENTS; ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND' drop event root22; create event root23 on schedule every -100 year do select 1; ERROR HY000: INTERVAL is either not positive or too big create event root23 on schedule every 222222222222222222222 year do select 1; ERROR HY000: INTERVAL is either not positive or too big drop event root6; drop event root7; drop event root8; drop event root8_1; drop event root9; drop event root10; drop event root11; drop event root12; drop event root13; drop event root13_1; drop event root14; drop event root15; drop event root16; drop event root17; drop event root17_1; drop event root18; drop event root19; drop event root20; drop event ����21; set names latin1; Create a test event. Only event metadata is relevant, the actual schedule and body are not. CREATE EVENT intact_check ON SCHEDULE EVERY 10 HOUR DO SELECT "nothing"; SHOW EVENTS; Db Name Definer Time zone Type Execute at Interval value Interval field Starts Ends Status Originator character_set_client collation_connection Database Collation events_test intact_check root@localhost SYSTEM RECURRING NULL 10 # # NULL ENABLED 1 latin1 latin1_swedish_ci latin1_swedish_ci Try to alter mysql.event: the server should fail to load event information after mysql.event was tampered with. First, let's add a column to the end and check the error is emitted. ALTER TABLE mysql.event ADD dummy INT; SHOW EVENTS; ERROR HY000: Failed to open mysql.event SELECT event_name FROM INFORMATION_SCHEMA.events; ERROR HY000: Failed to open mysql.event SHOW CREATE EVENT intact_check; ERROR HY000: Failed to open mysql.event DROP EVENT no_such_event; ERROR HY000: Failed to open mysql.event CREATE EVENT intact_check_1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ERROR HY000: Failed to open mysql.event ALTER EVENT intact_check_1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; ERROR HY000: Failed to open mysql.event ALTER EVENT intact_check_1 RENAME TO intact_check_2; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check_1; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check_2; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check; ERROR HY000: Failed to open mysql.event DROP DATABASE IF EXISTS mysqltest_no_such_database; Warnings: Note 1008 Can't drop database 'mysqltest_no_such_database'; database doesn't exist CREATE DATABASE mysqltest_db2; DROP DATABASE mysqltest_db2; Warnings: Error 1545 Failed to open mysql.event SELECT @@event_scheduler; @@event_scheduler OFF SHOW VARIABLES LIKE 'event_scheduler'; Variable_name Value event_scheduler OFF SET GLOBAL event_scheduler=OFF; ALTER TABLE mysql.event DROP dummy; DROP EVENT intact_check; CREATE EVENT intact_check ON SCHEDULE EVERY 10 HOUR DO SELECT "nothing"; Now let's add a column to the first position: the server expects to see event schema name there ALTER TABLE mysql.event ADD dummy INT FIRST; SHOW EVENTS; ERROR HY000: Failed to open mysql.event SELECT event_name FROM INFORMATION_SCHEMA.events; ERROR HY000: Failed to open mysql.event SHOW CREATE EVENT intact_check; ERROR HY000: Failed to open mysql.event DROP EVENT no_such_event; ERROR HY000: Failed to open mysql.event CREATE EVENT intact_check_1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ERROR HY000: Failed to open mysql.event ALTER EVENT intact_check_1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; ERROR HY000: Failed to open mysql.event ALTER EVENT intact_check_1 RENAME TO intact_check_2; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check_1; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check_2; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check; ERROR HY000: Failed to open mysql.event DROP DATABASE IF EXISTS mysqltest_no_such_database; Warnings: Note 1008 Can't drop database 'mysqltest_no_such_database'; database doesn't exist CREATE DATABASE mysqltest_db2; DROP DATABASE mysqltest_db2; Warnings: Error 1545 Failed to open mysql.event SELECT @@event_scheduler; @@event_scheduler OFF SHOW VARIABLES LIKE 'event_scheduler'; Variable_name Value event_scheduler OFF SET GLOBAL event_scheduler=OFF; Clean up ALTER TABLE mysql.event DROP dummy; DELETE FROM mysql.event; CREATE EVENT intact_check ON SCHEDULE EVERY 10 HOUR DO SELECT "nothing"; Back up the table, further changes are not reversible CREATE TABLE event_like LIKE mysql.event; INSERT INTO event_like SELECT * FROM mysql.event; Drop some columns and try more checks. ALTER TABLE mysql.event DROP comment, DROP starts; SHOW EVENTS; ERROR HY000: Failed to open mysql.event SELECT event_name FROM INFORMATION_SCHEMA.EVENTS; ERROR HY000: Failed to open mysql.event SHOW CREATE EVENT intact_check; ERROR HY000: Failed to open mysql.event DROP EVENT no_such_event; ERROR HY000: Failed to open mysql.event CREATE EVENT intact_check_1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ERROR HY000: Failed to open mysql.event ALTER EVENT intact_check_1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; ERROR HY000: Failed to open mysql.event ALTER EVENT intact_check_1 RENAME TO intact_check_2; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check_1; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check_2; ERROR HY000: Failed to open mysql.event DROP EVENT intact_check; ERROR HY000: Failed to open mysql.event DROP DATABASE IF EXISTS mysqltest_no_such_database; Warnings: Note 1008 Can't drop database 'mysqltest_no_such_database'; database doesn't exist CREATE DATABASE mysqltest_db2; DROP DATABASE mysqltest_db2; Warnings: Error 1545 Failed to open mysql.event SELECT @@event_scheduler; @@event_scheduler OFF SHOW VARIABLES LIKE 'event_scheduler'; Variable_name Value event_scheduler OFF SET GLOBAL event_scheduler=OFF; Now drop the table, and test again DROP TABLE mysql.event; SHOW EVENTS; ERROR 42S02: Table 'mysql.event' doesn't exist SELECT event_name FROM INFORMATION_SCHEMA.events; ERROR 42S02: Table 'mysql.event' doesn't exist SHOW CREATE EVENT intact_check; ERROR 42S02: Table 'mysql.event' doesn't exist DROP EVENT no_such_event; ERROR 42S02: Table 'mysql.event' doesn't exist CREATE EVENT intact_check_1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ERROR 42S02: Table 'mysql.event' doesn't exist ALTER EVENT intact_check_1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; ERROR 42S02: Table 'mysql.event' doesn't exist ALTER EVENT intact_check_1 RENAME TO intact_check_2; ERROR 42S02: Table 'mysql.event' doesn't exist DROP EVENT intact_check_1; ERROR 42S02: Table 'mysql.event' doesn't exist DROP EVENT intact_check_2; ERROR 42S02: Table 'mysql.event' doesn't exist DROP EVENT intact_check; ERROR 42S02: Table 'mysql.event' doesn't exist DROP DATABASE IF EXISTS mysqltest_no_such_database; Warnings: Note 1008 Can't drop database 'mysqltest_no_such_database'; database doesn't exist CREATE DATABASE mysqltest_db2; DROP DATABASE mysqltest_db2; Warnings: Error 1146 Table 'mysql.event' doesn't exist OK, there is an unnecessary warning about the non-existent table but it's not easy to fix and no one complained about it. A similar warning is printed if mysql.proc is missing. SHOW WARNINGS; Level Code Message Error 1146 Table 'mysql.event' doesn't exist SELECT @@event_scheduler; @@event_scheduler OFF SHOW VARIABLES LIKE 'event_scheduler'; Variable_name Value event_scheduler OFF SET GLOBAL event_scheduler=OFF; Restore the original table. CREATE TABLE mysql.event like event_like; DROP TABLE event_like; SHOW EVENTS; Db Name Definer Time zone Type Execute at Interval value Interval field Starts Ends Status Originator character_set_client collation_connection Database Collation # # Bug#12394306: the sever may crash if mysql.event is corrupted # CREATE EVENT ev1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ALTER EVENT ev1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; CREATE TABLE event_original LIKE mysql.event; INSERT INTO event_original SELECT * FROM mysql.event; ALTER TABLE mysql.event MODIFY modified CHAR(1); Warnings: Warning 1265 Data truncated for column 'modified' at row 1 SHOW EVENTS; ERROR HY000: Failed to open mysql.event SELECT event_name, created, last_altered FROM information_schema.events; ERROR HY000: Failed to open mysql.event CREATE EVENT ev2 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ERROR HY000: Failed to open mysql.event ALTER EVENT ev1 ON SCHEDULE EVERY 9 HOUR DO SELECT 9; ERROR HY000: Failed to open mysql.event DROP TABLE mysql.event; RENAME TABLE event_original TO mysql.event; DROP EVENT ev1; SHOW EVENTS; Db Name Definer Time zone Type Execute at Interval value Interval field Starts Ends Status Originator character_set_client collation_connection Database Collation # # End of tests # drop database events_test;