Vea la lista de todos los registros de binlog:
show master logs;
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000001 | 149 |
| mysql-bin.000002 | 4102 |
+------------------+-----------+
2 rows in set (0.00 sec)
Ver el binlog más reciente
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000002 | 4102 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
Ver la ubicación del registro
show variables like 'log_%';
mysql> show variables like 'log_%';
+----------------------------------------+----------------------------------------+
| Variable_name | Value |
+----------------------------------------+----------------------------------------+
| log_bin | ON |
| log_bin_basename | /var/lib/mysql/binlog |
| log_bin_index | /var/lib/mysql/binlog.index |
| log_bin_trust_function_creators | OFF |
| log_bin_use_v1_row_events | OFF |
| log_error | /var/log/mysqld.log |
| log_error_services | log_filter_internal; log_sink_internal |
| log_error_suppression_list | |
| log_error_verbosity | 2 |
| log_output | FILE |
| log_queries_not_using_indexes | OFF |
| log_raw | OFF |
| log_slave_updates | ON |
| log_slow_admin_statements | OFF |
| log_slow_extra | OFF |
| log_slow_slave_statements | OFF |
| log_statements_unsafe_for_binlog | ON |
| log_throttle_queries_not_using_indexes | 0 |
| log_timestamps | UTC |
+----------------------------------------+----------------------------------------+19 rows in set (0.11 sec)
Simule la pérdida de datos de la base de datos para recuperar datos:
Cree una nueva prueba de base de datos 1 Cree una nueva tabla de datos test1 en la biblioteca e inserte algunos datos
create database test1 CHARSET utf8;
CREATE TABLE test1(id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,NAME VARCHAR(20) NOT NULL)ENGINE=INNODB CHARSET=utf8;
insert into test1(id,name)values(1,'andy');
insert into test1(id,name)values(2,'kevin');
insert into test1(id,name)values(3,'peter');
Eliminar base de datos
drop database test1;
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| blog |
| goodssystem |
| hxpurchase |
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
7 rows in set (0.00 sec)
Utilice binlog para restaurar el registro:
Ver el registro de binlog, filtrar la cadena de creación de la base de datos y mostrar el contexto 5 líneas
mysqlbinlog --base64-output=decode-rows -vvv /var/lib/mysql/binlog.000010|grep 'create database' -C 5
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 35484306
#201107 15:36:45 server id 1 end_log_pos 35484430 CRC32 0xbc93546e Query thread_id=1358 exec_time=0 error_code=0 Xid = 313396
SET TIMESTAMP=1604734605/*!*/;
/*!80016 SET @@session.default_table_encryption=0*//*!*/;
create database test1 CHARSET utf8
/*!*/;
Puede ver que el número de posición inicial del comando create database test1 CHARSET utf8 es 35484306,
#### Luego filtrar la declaración de la base de datos de caída y mostrar el contexto 5 líneas
mysqlbinlog --base64-output=decode-rows -vvv /var/lib/mysql/binlog.000010|grep 'drop database' -C 5
/*!80014 SET @@session.immediate_server_version=80022*//*!*/;
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 35485840
#201107 15:40:50 server id 1 end_log_pos 35485947 CRC32 0x75bb6265 Query thread_id=1358 exec_time=0 error_code=0 Xid = 313437
SET TIMESTAMP=1604734850/*!*/;
drop database test1
/*!*/;
Puede ver que el número de posición ejecutado por la prueba de caída de la base de datos es 35485840, luego podemos establecer el número de posición del final de la intercepción en 35485839, de modo que solo se intercepten todos los registros antes de la declaración de caída
Posición inicial 35484306, posición final 35485839, intercepta el registro de la base de datos test1 especificada y guárdalo como un archivo .sql
mysqlbinlog --start-position=35484306 --stop-position=35485839 -d test1 /var/lib/mysql/binlog.000010 > /home/binlog_test.sql
Ingrese mysql, use la fuente para restaurar datos
source /home/binlog_test.sql;
mysql> source /home/binlog_test.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)
Charset changed
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, 1 warning (0.00 sec)
Query OK, 0 rows affected, 1 warning (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 1 row affected, 1 warning (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, 0 rows affected (0.00 sec)
Database changed
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected, 1 warning (0.02 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, 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, 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 (0.00 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)
Ver resultados
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| blog |
| goodssystem |
| hxpurchase |
| information_schema |
| mysql |
| performance_schema |
| sys |
| test1 |
+--------------------+
8 rows in set (0.01 sec)
mysql> use test1;
use test1;
^C
mysql> show tables;
+-----------------+
| Tables_in_test1 |
+-----------------+
| test1 |
+-----------------+
1 row in set (0.00 sec)
mysql> select * from test1;
+----+-------+
| id | NAME |
+----+-------+
| 1 | andy |
| 2 | kevin |
| 3 | peter |
+----+-------+
3 rows in set (0.01 sec)