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select @@global.plugin_dir;
@@global.plugin_dir
MYSQL_TMP_DIR/
select @@session.plugin_dir;
ERROR HY000: Variable 'plugin_dir' is a GLOBAL variable
show global variables like 'plugin_dir';
Variable_name Value
plugin_dir MYSQL_TMP_DIR/
show session variables like 'plugin_dir';
Variable_name Value
plugin_dir MYSQL_TMP_DIR/
select * from information_schema.global_variables where variable_name='plugin_dir';
VARIABLE_NAME VARIABLE_VALUE
PLUGIN_DIR MYSQL_TMP_DIR/
select * from information_schema.session_variables where variable_name='plugin_dir';
VARIABLE_NAME VARIABLE_VALUE
PLUGIN_DIR MYSQL_TMP_DIR/
set global plugin_dir=1;
ERROR HY000: Variable 'plugin_dir' is a read only variable
set session plugin_dir=1;
ERROR HY000: Variable 'plugin_dir' is a read only variable
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