1select @@global.shared_memory_base_name; 2@@global.shared_memory_base_name 3MYSQL_TMP_DIR/mysqld.1.sock 4select @@session.shared_memory_base_name; 5ERROR HY000: Variable 'shared_memory_base_name' is a GLOBAL variable 6show global variables like 'shared_memory_base_name'; 7Variable_name Value 8shared_memory_base_name MYSQL_TMP_DIR/mysqld.1.sock 9show session variables like 'shared_memory_base_name'; 10Variable_name Value 11shared_memory_base_name MYSQL_TMP_DIR/mysqld.1.sock 12select * from information_schema.global_variables where variable_name='shared_memory_base_name'; 13VARIABLE_NAME VARIABLE_VALUE 14SHARED_MEMORY_BASE_NAME MYSQL_TMP_DIR/mysqld.1.sock 15select * from information_schema.session_variables where variable_name='shared_memory_base_name'; 16VARIABLE_NAME VARIABLE_VALUE 17SHARED_MEMORY_BASE_NAME MYSQL_TMP_DIR/mysqld.1.sock 18set global shared_memory_base_name=1; 19ERROR HY000: Variable 'shared_memory_base_name' is a read only variable 20set session shared_memory_base_name=1; 21ERROR HY000: Variable 'shared_memory_base_name' is a read only variable 22