Details
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Bug
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Status: Open (View Workflow)
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Trivial
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Resolution: Unresolved
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10.4(EOL), 10.5, 10.6, 10.11, 11.0(EOL), 11.1(EOL), 11.2(EOL), 11.4, 11.5(EOL)
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None
Description
Innodb_instant_alter_column is a "global" session variable, if this term can be applied here. Its changes in one connection affect other connections' session status, and FLUSH STATUS doesn't reset it.
In the test below it is compared to a "normal" session variable. Semantically, it would be reasonable to expect that they behave in a similar fashion.
--source include/have_innodb.inc
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create table t (a int) engine=InnoDB; |
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select variable_name, variable_value from information_schema.session_status |
where variable_name in ('Innodb_instant_alter_column','Com_alter_table'); |
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alter table t add b int; |
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select variable_name, variable_value from information_schema.session_status |
where variable_name in ('Innodb_instant_alter_column','Com_alter_table'); |
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--connect (con1,localhost,root,,)
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select variable_name, variable_value from information_schema.session_status |
where variable_name in ('Innodb_instant_alter_column','Com_alter_table'); |
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--connection default
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flush status;
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select variable_name, variable_value from information_schema.session_status |
where variable_name in ('Innodb_instant_alter_column','Com_alter_table'); |
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# Cleanup
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drop table t; |
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10.4 59e7289b6ce93e52b251466e18a2e0eab8b47c36 |
create table t (a int) engine=InnoDB; |
select variable_name, variable_value from information_schema.session_status |
where variable_name in ('Innodb_instant_alter_column','Com_alter_table'); |
variable_name variable_value
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COM_ALTER_TABLE 0
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INNODB_INSTANT_ALTER_COLUMN 0
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alter table t add b int; |
select variable_name, variable_value from information_schema.session_status |
where variable_name in ('Innodb_instant_alter_column','Com_alter_table'); |
variable_name variable_value
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COM_ALTER_TABLE 1
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INNODB_INSTANT_ALTER_COLUMN 1
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connect con1,localhost,root,,; |
select variable_name, variable_value from information_schema.session_status |
where variable_name in ('Innodb_instant_alter_column','Com_alter_table'); |
variable_name variable_value
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COM_ALTER_TABLE 0
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INNODB_INSTANT_ALTER_COLUMN 1
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connection default; |
flush status;
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select variable_name, variable_value from information_schema.session_status |
where variable_name in ('Innodb_instant_alter_column','Com_alter_table'); |
variable_name variable_value
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COM_ALTER_TABLE 0
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INNODB_INSTANT_ALTER_COLUMN 1
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drop table t; |