How to use MySQL binlog to restore accidentally deleted databases

[root@localhost ~]# mysqldump -u root -pt > /mnt/t.sql
Enter password: 
[root@localhost ~]# ll /mnt/t.sql 
-rw-r--r-- 1 root root 1771 Aug 25 11:56 /mnt/t.sql

mysql> show variables like "%log_bin%";

mysql> insert into t1 values ​​(3);
Query OK, 1 row affected (0.00 sec)

mysql> insert into t1 values ​​(4);
Query OK, 1 row affected (0.00 sec)

mysql> insert into t1 values ​​(5);
Query OK, 1 row affected (0.00 sec)

mysql> select * from t1;
+------+
|id|
+------+
| 1 |
| 2 |
| 5 |
| 4 |
| 3 |
+------+
5 rows in set (0.00 sec)

mysql> flush logs;
Query OK, 0 rows affected (0.00 sec)

mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql_bin.000003 | 106 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

mysql> truncate t1;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from t1;
Empty set (0.00 sec)

mysql> drop table t1;
Query OK, 0 rows affected (0.00 sec)

mysql> show tables;
Empty set (0.00 sec)

mysql> source /mnt/t.sql;
Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
mysql> show tables;
+-------------+
| Tables_in_t |
+-------------+
| t1 |
+-------------+
1 row in set (0.00 sec)

mysql> select * from t1;
+------+
|id|
+------+
| 1 |
| 2 |
+------+
2 rows in set (0.00 sec)

[root@localhost ~]# mysqlbinlog --no-defaults /var/lib/mysql/mysql_bin.000002 | mysql -u root -p123.com t

mysql> use t;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from t1;
+------+
|id|
+------+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
+------+
5 rows in set (0.00 sec)

mysql>

mysqldump -uroot -p123456 test -l -F '/tmp/test.sql'
-l: read lock (can only read, cannot update)
-F: flush logs, which can regenerate new log files, including log-bin logs

mysql>show master status;

mysql -uroot -pt -v -f </mnt/t.sql
-v shows detailed information about the import -f means that if an error occurs in the middle, you can skip it and continue to execute the following statement

mysqlbinlog --no-defaults binlog-file | mysql -uroot -pt

mysqlbinlog --no-defaults --stop-position="367" mysql-bin.000001| mysql -uroot -pt

[root@localhost mysql]# /usr/bin/mysqlbinlog --no-defaults mysql-bin.000002 --start-position="794" --stop-position="1055" | more

[root@localhost mysql]# /usr/bin/mysqlbinlog --no-defaults mysql-bin.000002 --start-position="794" --stop-position="1055" | /usr/bin/mysql -uroot -pt

mysql> reset master;
Query OK, 0 rows affected (0.01 sec)

mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 | 106 | | |
+------------------+----------+--------------+------------------+

mysql> flush logs;#Close the current binary log file and create a new one. The name of the new binary log file is the number of the current binary file plus 1.