mariadb数据库基于时间点恢复

模拟ceshi库写入数据

mysql> create database ceshi;
Query OK, 1 row affected (0.01 sec)

mysql> use ceshi;
Database changed
mysql> create table t1(id int primary key);
Query OK, 0 rows affected (0.01 sec)

mysql> insert into t1 select 1;
Query OK, 1 row affected (0.00 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> insert into t1 select 2;
Query OK, 1 row affected (0.01 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> insert into t1 select 3;
Query OK, 1 row affected (0.00 sec)
Records: 1  Duplicates: 0  Warnings: 0

mydumper 备份数据

mydumper -u root -p 123456 -h 127.0.0.1 --regex '^(?!(information_schema|performance_schema|sys))' -c -o /root/bak
备份中包含mysql库，我们可以不用恢复
rm -rf /root/bak/mysql*

继续模拟ceshi库写入数据，直到最后将t1表同时

mysql> insert into t1 select 4;
Query OK, 1 row affected (0.01 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> insert into t1 select 5;
Query OK, 1 row affected (0.00 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> insert into t1 select 6;
Query OK, 1 row affected (0.01 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> drop table t1;
Query OK, 0 rows affected (0.01 sec)

分析binlog，找到删除时间点,可以看到是08:30:55删除的（时间是UTC时区），我们需要恢复到 08:30:55 之前的位点，也就是 mysql-bin.000001,2158

# bin/mysqlbinlog -vv mysql-bin.000001 
----------------------------------------------------------
#220105  8:30:50 server id 194207  end_log_pos 2127 CRC32 0xab43d17e    Write_rows: table id 21 flags: STMT_END_F

BINLOG '
OlfVYROf9gIALgAAACkIAAAAABUAAAAAAAEABWNlc2hpAAJ0MQABAwAAFEcsuw==
OlfVYRef9gIAJgAAAE8IAAAAABUAAAAAAAEAAf/+BgAAAH7RQ6s=
'/*!*/;
### INSERT INTO `ceshi`.`t1`
### SET
###   @1=6 /* INT meta=0 nullable=0 is_null=0 */
# Number of rows: 1
# at 2127
#220105  8:30:50 server id 194207  end_log_pos 2158 CRC32 0xeede276c    Xid = 164
COMMIT/*!*/;
# at 2158
#220105  8:30:55 server id 194207  end_log_pos 2200 CRC32 0xa0098b6d    GTID 0-194207-11 ddl
/*!100001 SET @@session.gtid_seq_no=11*//*!*/;
# at 2200
#220105  8:30:55 server id 194207  end_log_pos 2309 CRC32 0x59844e79    Query   thread_id=9     exec_time=0     error_code=0
SET TIMESTAMP=1641371455/*!*/;
DROP TABLE `t1` /* generated by server */
/*!*/;

新建一个mariadb实例（过程省略）

1、使用myloader命令将数据恢复到新实例上
myloader -u root -p '' -h 127.0.0.1 -P 3307 -d /root/bak
cat metcdata 查看备份位点 Log: mysql-bin.000001,1549
2、增量恢复，change master搭备库方式

change master to master_host='127.0.0.1',master_port=3306,master_user='root',master_password='123456',master_log_file='mysql-bin.000001',master_log_pos=1549;
本来想为了加快速度，只回放 ceshi 库 t1表 的binlog。算了，mariadb不支持，就这样同步吧。
start slave until MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=2158;


数据都回来了
mysql> select * from t1;
+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
|  5 |
|  6 |
+----+
6 rows in set (0.00 sec)