MySQL binlog恢复

Posted 2020-10-30 qiezijiajia

mysql binlog恢复数据，有时候可能不小心delete了数据，一下子捉急了，怎么办？  binlog来恢复（前提是你开启了binlog），怎么开启呢？

在my.cnf文件中添加如下

[mysqld]
log_bin = mysql_bin

重启服务即可

接下来讲讲怎么恢复，删除数据后，马上查看当前的数据库处于哪个binlog文件：

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql_bin.000001 | 1016 | | | |
+------------------+----------+--------------+------------------+-------------------+

接下来查看binlog文件在哪

find / -name mysql_bin.000001

去到binlog的目录下，执行mysqlbinlog mysql_bin.000001（这里我的文件比较小，文件大的话加上过滤或者分页）

/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @[email protected]@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#180409 20:56:53 server id 1 end_log_pos 120 CRC32 0xf20fd50f Start: binlog v 4, server v 5.6.39-log created 180409 20:56:53 at startup
# Warning: this binlog is either in use or was not closed properly.
ROLLBACK/*!*/;
BINLOG ‘
FWPLWg8BAAAAdAAAAHgAAAABAAQANS42LjM5LWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAVY8taEzgNAAgAEgAEBAQEEgAAXAAEGggAAAAICAgCAAAACgoKGRkAAQ/V
D/I=
‘/*!*/;
# at 120
#180409 20:58:03 server id 1 end_log_pos 199 CRC32 0x2c3cc333 Query thread_id=2 exec_time=0 error_code=0
SET TIMESTAMP=1523278683/*!*/;
SET @@session.pseudo_thread_id=2/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=1075838976/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C utf8 *//*!*/;
SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=8/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 199
#180409 20:58:03 server id 1 end_log_pos 313 CRC32 0xd0d61192 Query thread_id=2 exec_time=0 error_code=0
use `test`/*!*/;
SET TIMESTAMP=1523278683/*!*/;
insert into by_year values(‘2019-10-10‘)
/*!*/;
# at 313
#180409 20:58:03 server id 1 end_log_pos 344 CRC32 0x614b6da7 Xid = 14
COMMIT/*!*/;
# at 344
#180409 20:58:20 server id 1 end_log_pos 423 CRC32 0x7610d8d6 Query thread_id=2 exec_time=0 error_code=0
SET TIMESTAMP=1523278700/*!*/;
BEGIN
/*!*/;
# at 423
#180409 20:58:20 server id 1 end_log_pos 537 CRC32 0xea1fbbcb Query thread_id=2 exec_time=0 error_code=0
SET TIMESTAMP=1523278700/*!*/;
delete from by_year where d=‘2019-10-10‘  （删除语句）
/*!*/;
# at 537
#180409 20:58:20 server id 1 end_log_pos 568 CRC32 0xacbe35a7 Xid = 15
COMMIT/*!*/;

很明显，这时候只需要把前面插入的语句恢复即可

找到对应的时间点，将binlog导出到sql文件中

mysqlbinlog --start-datetime=‘2018-04-09 20:58:00‘ --stop-datetime=‘2018-04-09 20:58:18‘  mysql_bin.000001 > tmp.sql

再将sql导入即可