mariadb/mysql-test/t/events_restart.test

# Can't test with embedded server that doesn't support grants
-- source include/not_embedded.inc

#
# Test that when the server is restarted, it checks mysql.event table,
# and disables the scheduler if it's not up to date.
#

# Switch off the scheduler for now.
set global event_scheduler=off;

--disable_warnings
drop database if exists events_test;
--enable_warnings
create database events_test;
use events_test;
create table execution_log(name char(10));

create event abc1 on schedule every 1 second do
  insert into execution_log value('abc1');
create event abc2 on schedule every 1 second do
  insert into execution_log value('abc2');
create event abc3 on schedule every 1 second do 
  insert into execution_log value('abc3');
#
# There are various conditions when a server would regard mysql.event
# table as damaged:
# - the table has more column than specified in the compiled in value, but
# the version of the server which created the table is the same
# - the column count in the table is less than the compiled in value
# - some column has an incompatible type specification (for what is an
# incompatible type specification please refer to the comments in the source
#
# Unfortunately, in order to test a condition, we need to restart the
# server. Therefore, here we test only one simple case: changing the data
# type of the 'body' field to blob.
#
# First, let's do a backup to not depend on actual definition of mysql.event
create table event_like like mysql.event;
insert into event_like select * from mysql.event;
# Now let's alter the table and restart the server
alter table mysql.event
  change column body  body longtext character set utf8 collate utf8_bin;
--echo "Now we restart the server"

--source include/restart_mysqld.inc

use events_test;
# Event scheduler should be disabled: the system tables are damaged
select @@event_scheduler;
# Try various Event Scheduler operation and check the output.
--error ER_EVENTS_DB_ERROR
show events;
--error ER_EVENTS_DB_ERROR
select event_name from information_schema.events;
--error ER_EVENTS_DB_ERROR
show create event intact_check;
--error ER_EVENTS_DB_ERROR
drop event no_such_event;
--error ER_EVENTS_DB_ERROR
create event intact_check_1 on schedule every 5 hour do select 5;
--error ER_EVENTS_DB_ERROR
alter event intact_check_1 on schedule every 8 hour do select 8;
--error ER_EVENTS_DB_ERROR
alter event intact_check_1 rename to intact_check_2;
--error ER_EVENTS_DB_ERROR
drop event intact_check_1;
--error ER_EVENTS_DB_ERROR
drop event intact_check_2;
--error ER_EVENTS_DB_ERROR
drop event intact_check;
--error ER_EVENTS_DB_ERROR
set global event_scheduler=on;
--error ER_EVENTS_DB_ERROR
set global event_scheduler=off;
show variables like 'event_scheduler';
--echo Make sure that we still can create and drop databases,
--echo and no warnings are produced.
drop database if exists mysqltest_database_not_exists;
create database mysqltest_db1;
drop database mysqltest_db1;
--echo Restore the original mysql.event table
drop table mysql.event;
rename table event_like to mysql.event;
--echo Now let's restart the server again

--source include/restart_mysqld.inc

# We need this file primarily to make sure that the scheduler is restarted
# and enabled after we have restored mysql.event table.
# This is the final step of the "cleanup".
#
# Make sure also that events are executed OK after restart, just in case.
use events_test;
# Make sure the scheduler was started successfully
select @@event_scheduler;
let $wait_condition=select count(distinct name)=3 from execution_log;
--source include/wait_condition.inc
drop table execution_log;
# Will drop all events
drop database events_test;

let $wait_condition=
  select count(*) = 0 from information_schema.processlist
  where db='events_test' and command = 'Connect' and user=current_user();
--source include/wait_condition.inc