MySQL 主从复制（三）

[root@mysql-master ~]# mysql -u root -p

mysql> show variables like '%binlog%';
+--------------------------------------------+----------------------+
| Variable_name                              | Value                |
+--------------------------------------------+----------------------+
| binlog_cache_size                          | 32768                |
| binlog_checksum                            | CRC32                |
| binlog_direct_non_transactional_updates    | OFF                  |
| binlog_error_action                        | ABORT_SERVER         |
| binlog_expire_logs_seconds                 | 2592000              |
| binlog_format                              | ROW                  |
| binlog_group_commit_sync_delay             | 0                    |
| binlog_group_commit_sync_no_delay_count    | 0                    |
| binlog_gtid_simple_recovery                | ON                   |
| binlog_max_flush_queue_time                | 0                    |
| binlog_order_commits                       | ON                   |
| binlog_row_image                           | FULL                 |
| binlog_row_metadata                        | MINIMAL              |
| binlog_row_value_options                   |                      |
| binlog_rows_query_log_events               | OFF                  |
| binlog_stmt_cache_size                     | 32768                |
| binlog_transaction_dependency_history_size | 25000                |
| binlog_transaction_dependency_tracking     | COMMIT_ORDER         |
| innodb_api_enable_binlog                   | OFF                  |
| log_statements_unsafe_for_binlog           | ON                   |
| max_binlog_cache_size                      | 18446744073709547520 |
| max_binlog_size                            | 1073741824           |
| max_binlog_stmt_cache_size                 | 18446744073709547520 |
| sync_binlog                                | 1                    |
+--------------------------------------------+----------------------+
24 rows in set (0.03 sec)

mysql> select 2592000/3600;
+--------------+
| 2592000/3600 |
+--------------+
|     720.0000 |
+--------------+
1 row in set (0.00 sec)

mysql> select 2592000/3600/24;
+-----------------+
| 2592000/3600/24 |
+-----------------+
|     30.00000000 |
+-----------------+
1 row in set (0.00 sec)