MySQL误删数据或者丢失？这6种方案能帮你快速恢复！

mysqlbinlog --start-datetime="2023-08-01 14:00:00" \
           --stop-datetime="2023-08-01 14:05:00" \
           mysql-bin.000001 > /tmp/err.sql

# parse_binlog.py
import pymysql
from pymysqlreplication import BinLogStreamReader

stream = BinLogStreamReader(
   connection_settings = {
       "host": "127.0.0.1",
       "port": 3306,
       "user": "root",
       "passwd": "root"},
   server_id=100,
   blocking=True,
   resume_stream=True,
   only_events=[DeleteRowsEvent, UpdateRowsEvent])

for binlogevent in stream:
   for row in binlogevent.rows:
       if isinstance(binlogevent, DeleteRowsEvent):
           # 生成INSERT语句
           print(f"INSERT INTO {binlogevent.table} VALUES {row['values']}")
       elif isinstance(binlogevent, UpdateRowsEvent):
           # 生成反向UPDATE
           print(f"UPDATE {binlogevent.table} SET {row['before_values']} WHERE {row['after_values']}")

python parse_binlog.py | mysql -u root -p db_name

STOP SLAVE;
CHANGE MASTER TO MASTER_DELAY = 1800; -- 延迟30分钟(1800秒)
START SLAVE;

STOP SLAVE;

RESET SLAVE ALL;
SHOW MASTER STATUS; -- 记录binlog位置

mysql -u root -p db_name < full_backup_20230801.sql

mysqlbinlog --start-positinotallow=100 --stop-positinotallow=500 \
          mysql-bin.000001 | mysql -u root -p

SELECT * FROM information_schema.INNODB_TRX;

SHOW ENGINE INNODB STATUS;

./undrop-for-innodb/system_parser -t user_data /var/lib/mysql/ibdata1

yum install testdisk -y

photorec /dev/sdb1

CREATE TABLE user_data (...) ENGINE=InnoDB;

ALTER TABLE user_data DISCARD TABLESPACE;
cp recovered.ibd /var/lib/mysql/db_name/user_data.ibd
ALTER TABLE user_data IMPORT TABLESPACE;

# 通过SDK创建临时实例
aliyun rds CloneInstance --DBInstanceId rm-xxxx \
                       --BackupId 111111111 \
                       --PayType Postpaid

-- 禁止开发直接操作生产库
REVOKEALLPRIVILEGESON *.* FROM'dev_user'@'%';

-- 只读账号配置
GRANTSELECTON app_db.* TO'read_user'@'%';

-- DML权限分离
CREATEROLE dml_role;
GRANTINSERT, UPDATE, DELETEON app_db.* TO dml_role;

-- 危险操作示例
DROP TABLE IF EXISTS user_data; -- 必须添加IF EXISTS