模擬增量恢復

前提條件:
　　1.具備全量備份（mysqldump）。
　　2.除全量備份以外，還有全量備份之後產生的的所有binlog增量日誌。
環境準備:

CREATE DATABASE dump;
USE `dump`;
CREATE TABLE `test` (
  `id` int(4) NOT NULL AUTO_INCREMENT,
  `name` char(20) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
INSERT INTO `test` VALUES (1,'hehe'),(2,'haha'),(3,'lala'),(4,'lili'),(5,'kaka');
commit;
 

模擬環境：

mkdir /data/backup -p
date -s "2020/7/20"

2020/7/20這天0晨建立一個全備：

mysqldump -uroot -p123456 \
-A --master-data=2 --single-transaction \
-R -E --triggers --set-gtid-purged=OFF \
--max-allowed-packet=256M gzip> /data/backup/full_$(date +%F).sql.gz

2020/7/20資料增加：

date -s "2020/7/20"
use dump;insert into test values(6,'lanlan');
commit;
 

模擬誤刪資料：

date -s "2020/7/20 11:40"
drop database dump;show databases;
#出現問題10分鐘後,發現問題,刪除了資料庫了.

恢復資料準備

檢視最後一次全備binlog pos點:

sed -n '22p' full_2020-07-20.sql
-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000003', MASTER_LOG_POS=655;

檢視刪除操作的binlog pos點:

3306 [(none)]>show binary logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |      2755 |
| mysql-bin.000002 |       217 |
| mysql-bin.000003 |      1077 |
+------------------+-----------+
3306 [(none)]>show binlog events in 'mysql-bin.000003';
+------------------+-----+----------------+-----------+-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Log_name         | Pos | Event_type     | Server_id | End_log_pos | Info                                                                                                                                                                            |
+------------------+-----+----------------+-----------+-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| mysql-bin.000003 |   4 | Format_desc    |         6 |         123 | Server ver: 5.7.28-log, Binlog ver: 4                                                                                                                                           |
| mysql-bin.000003 | 123 | Previous_gtids |         6 |         194 | f4c2d64d-c2c8-11ea-b04c-000c297a2fa5:1-11                                                                                                                                       |
| mysql-bin.000003 | 194 | Gtid           |         6 |         259 | SET @@SESSION.GTID_NEXT= '280d97e6-cb76-11ea-8b1f-000c29d7eddb:1'                                                                                                               |
| mysql-bin.000003 | 259 | Query          |         6 |         353 | CREATE DATABASE dump                                                                                                                                                            |
| mysql-bin.000003 | 353 | Gtid           |         6 |         418 | SET @@SESSION.GTID_NEXT= '280d97e6-cb76-11ea-8b1f-000c29d7eddb:2'                                                                                                               |
| mysql-bin.000003 | 418 | Query          |         6 |         655 | use `dump`; CREATE TABLE `test` (
  `id` int(4) NOT NULL AUTO_INCREMENT,
  `name` char(20) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8 |
| mysql-bin.000003 | 655 | Gtid           |         6 |         720 | SET @@SESSION.GTID_NEXT= '280d97e6-cb76-11ea-8b1f-000c29d7eddb:3'                                                                                                               |
| mysql-bin.000003 | 720 | Query          |         6 |         792 | BEGIN                                                                                                                                                                           |
| mysql-bin.000003 | 792 | Table_map      |         6 |         842 | table_id: 110 (dump.test)                                                                                                                                                       |
| mysql-bin.000003 | 842 | Write_rows     |         6 |         889 | table_id: 110 flags: STMT_END_F                                                                                                                                                 |
| mysql-bin.000003 | 889 | Xid            |         6 |         920 | COMMIT /* xid=486 */                                                                                                                                                            |
| mysql-bin.000003 | 920 | Gtid           |         6 |         985 | SET @@SESSION.GTID_NEXT= '280d97e6-cb76-11ea-8b1f-000c29d7eddb:4'                                                                                                               |
| mysql-bin.000003 | 985 | Query          |         6 |        1077 | drop database dump                                                                                                                                                              |
+------------------+-----+----------------+-----------+-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
13 rows in set (0.00 sec)
 

擷取日誌：

zcat full_2020-07-20.sql.gz >full_2020-07-20.sql
mysqlbinlog --start-position=655 --stop-position=920 /binlog/3306/mysql-bin.000003 -r bin.sql

需要恢復的日誌:

3306 [(none)]>source full_2020-07-20.sql;
3306 [mysql]>source bin.sql;