############## mysql-test/t/innodb_rollback_segments_basic.test ###############
#                                                                             #
# Variable Name: innodb_rollback_segments                                     #
# Scope: Global                                                               #
# Access Type: Static                                                         #
# Data Type: numeric                                                          #
#                                                                             #
#                                                                             #
# Creation Date: 2011-07-05                                                   #
# Author: Sunny Bains                                                         #
# Modified: Kevin Lewis  2015-12-15                                           #
#           innodb_undo_logs -> innodb_rollback_segments                      #
#                                                                             #
# Description: Read-Write config global variable innodb_rollback_segments     #
#              * Value check                                                  #
#              * Scope check                                                  #
#                                                                             #
###############################################################################


SET @start_global_value = @@global.innodb_rollback_segments;
SELECT @start_global_value;

--echo #
--echo # Default value is 128 and exists as global only
--echo #
SELECT @@GLOBAL.innodb_rollback_segments;
SELECT @@GLOBAL.innodb_rollback_segments >=0;
SELECT @@GLOBAL.innodb_rollback_segments <=128;
SELECT COUNT(@@GLOBAL.innodb_rollback_segments);
SELECT COUNT(@@innodb_rollback_segments);
SHOW GLOBAL variables LIKE 'innodb_rollback_segments';
SHOW SESSION variables LIKE 'innodb_rollback_segments';

--echo # Expected below: error 'Variable is a GLOBAL variable'
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT @@SESSION.innodb_rollback_segments;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT COUNT(@@SESSION.innodb_rollback_segments);
--Error ER_BAD_FIELD_ERROR
SELECT innodb_rollback_segments = @@SESSION.innodb_rollback_segments;

--Error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT @@LOCAL.innodb_rollback_segments;
--Error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT COUNT(@@LOCAL.innodb_rollback_segments);
--Error ER_BAD_FIELD_ERROR
SELECT innodb_rollback_segments = @@LOCAL.innodb_rollback_segments;

--echo #
--echo # Check if accessing variable with and without GLOBAL point to same variable
--echo #
SELECT @@innodb_rollback_segments = @@GLOBAL.innodb_rollback_segments;

--echo #
--echo # Check if the value in GLOBAL table matches value in performance_schema
--echo #
--disable_warnings
SELECT * FROM performance_schema.global_variables 
         WHERE variable_name='innodb_rollback_segments';
SELECT * FROM performance_schema.session_variables 
         WHERE variable_name='innodb_rollback_segments';
--enable_warnings

--echo #
--echo # Check if value can be set
--echo #
SET GLOBAL innodb_rollback_segments=100;
SELECT @@global.innodb_rollback_segments;

--disable_warnings
SELECT * FROM performance_schema.global_variables 
         WHERE variable_name='innodb_rollback_segments';
SELECT * FROM performance_schema.session_variables 
         WHERE variable_name='innodb_rollback_segments';
--enable_warnings

--error ER_GLOBAL_VARIABLE
SET SESSION innodb_rollback_segments=101;

--echo #
--echo # Valid values are 1 - 128
--echo #
--error ER_WRONG_TYPE_FOR_VAR
SET GLOBAL innodb_rollback_segments=1.1;
--error ER_WRONG_TYPE_FOR_VAR
SET GLOBAL innodb_rollback_segments=1e1;
--error ER_WRONG_TYPE_FOR_VAR
SET GLOBAL innodb_rollback_segments="foo";
SET GLOBAL innodb_rollback_segments=-7;
SELECT @@global.innodb_rollback_segments;
SET GLOBAL innodb_rollback_segments=0;
SELECT @@global.innodb_rollback_segments;
SET GLOBAL innodb_rollback_segments=50;
SELECT @@global.innodb_rollback_segments;
SET GLOBAL innodb_rollback_segments=129;
SELECT @@global.innodb_rollback_segments;

--disable_warnings
SELECT * FROM performance_schema.global_variables 
         WHERE variable_name='innodb_rollback_segments';
--enable_warnings

--echo #
--echo # cleanup
--echo #
SET @@global.innodb_rollback_segments = @start_global_value;
SELECT @@global.innodb_rollback_segments;