mysql too many open connections问题解决方法

show variables;

show variables like 'max%';
+—————————-+————+
| Variable_name | Value |
+—————————-+————+
| max_allowed_packet | 1048576 |
| max_binlog_cache_size | 4294963200 |
| max_binlog_size | 1073741824 |
| max_connect_errors | 10 |
| max_connections | 151 |
| max_delayed_threads | 20 |
| max_error_count | 64 |
| max_heap_table_size | 16777216 |
| max_insert_delayed_threads | 20

max_connections=2000
# The MySQL server
[mysqld]
port            = 3306
socket          = /Applications/XAMPP/xamppfiles/var/mysql/mysql.sock

# The MySQL server
[mysqld]
max_connections=2000
port            = 3306

+—————————-+————+
| Variable_name | Value |
+—————————-+————+
| max_allowed_packet | 1048576 |
| max_binlog_cache_size | 4294963200 |
| max_binlog_size | 1073741824 |
| max_connect_errors | 10 |
| max_connections | 2000 |
| max_delayed_threads | 20 |
| max_error_count | 64 |
| max_heap_table_size | 16777216 |
| max_insert_delayed_threads | 20