show variables like 'sql_error_log%';
Variable_name	Value
sql_error_log_filename	sql_errors.log
sql_error_log_rate	1
sql_error_log_rotate	OFF
sql_error_log_rotations	9
sql_error_log_size_limit	1000000
sql_error_log_with_db_and_thread_info	ON
set global sql_error_log_rate=1;
# Trying to set the variable at runtime
SET sql_error_log_with_db_and_thread_info=OFF;
ERROR HY000: Variable 'sql_error_log_with_db_and_thread_info' is a read only variable
#
# Using test database from mtr
#
DROP DATABASE db;
ERROR HY000: Can't drop database 'db'; database doesn't exist
#
# Using no database at all
#
DROP DATABASE test;
DROP DATABASE db;
ERROR HY000: Can't drop database 'db'; database doesn't exist
#
# Using database with name `NULL`
#
CREATE DATABASE `NULL`;
USE `NULL`;
DROP DATABASE db;
ERROR HY000: Can't drop database 'db'; database doesn't exist
TIME THREAD_ID HOSTNAME `test` ERROR 1238: Variable 'sql_error_log_with_db_and_thread_info' is a read only variable : SET sql_error_log_with_db_and_thread_info=OFF 
TIME THREAD_ID HOSTNAME `test` ERROR 1008: Can't drop database 'db'; database doesn't exist : DROP DATABASE db 
TIME THREAD_ID HOSTNAME NULL ERROR 1008: Can't drop database 'db'; database doesn't exist : DROP DATABASE db 
TIME THREAD_ID HOSTNAME `NULL` ERROR 1008: Can't drop database 'db'; database doesn't exist : DROP DATABASE db 
DROP DATABASE `NULL`;
# Reset
CREATE DATABASE test;