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select @@global.pid_file;
@@global.pid_file
MYSQLTEST_VARDIR/run/mysqld.1.pid
select @@session.pid_file;
ERROR HY000: Variable 'pid_file' is a GLOBAL variable
show global variables like 'pid_file';
Variable_name Value
pid_file MYSQLTEST_VARDIR/run/mysqld.1.pid
show session variables like 'pid_file';
Variable_name Value
pid_file MYSQLTEST_VARDIR/run/mysqld.1.pid
select * from information_schema.global_variables where variable_name='pid_file';
VARIABLE_NAME VARIABLE_VALUE
PID_FILE MYSQLTEST_VARDIR/run/mysqld.1.pid
select * from information_schema.session_variables where variable_name='pid_file';
VARIABLE_NAME VARIABLE_VALUE
PID_FILE MYSQLTEST_VARDIR/run/mysqld.1.pid
set global pid_file=1;
ERROR HY000: Variable 'pid_file' is a read only variable
set session pid_file=1;
ERROR HY000: Variable 'pid_file' is a read only variable
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