mariadb/mysql-test/suite/sys_vars/t/thread_concurrency_basic.test
Magne Mahre a3b9557b3a Bug#55001 Change in behavior: thread_concurrency (docs,
example files)

The system variable 'thread_concurrency' has been
(re-)enabled on all platforms, to prevent startup
errors.

'thread_concurrency' is unused and has no effect,
on any platform, in MySQL 5.1 and later versions.  It 
will be deprecated, and removed, in context of 
worklog WL#5265


mysql-test/include/have_thread_concurrency.inc:
  include/have_thread_concurrency.inc was only needed
  to support platforms that didn't have the
  thread_concurrency variable available.  Since the
  variable is now available on all platforms, the file
  is removed.
2010-08-16 15:05:01 +02:00

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#
# only global
#
select @@global.thread_concurrency;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
select @@session.thread_concurrency;
show global variables like 'thread_concurrency';
show session variables like 'thread_concurrency';
select * from information_schema.global_variables where variable_name='thread_concurrency';
select * from information_schema.session_variables where variable_name='thread_concurrency';
#
# show that it's read-only
#
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
set global thread_concurrency=1;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
set session thread_concurrency=1;