万答#14，xtrabackup8.0怎么恢复单表

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实验场景

GreatSQL 8.0.25 InnoDB

1.备份,导出单表, test.t_user

/usr/bin/xtrabackup -uroot -p'GreatSQL' -S /data/GreatSQL/mysql.sock --tables='test.t_user' --backup --target-dir=/data/backup

2.恢复备份

xtrabackup --prepare --export --target-dir=/data/backup

3.建测试表

[root@GreatSQL][test02]>CREATE TABLE `t_user` (
    ->   `id` bigint NOT NULL AUTO_INCREMENT,
    ->   `name` varchar(255) DEFAULT NULL,
    ->   `age` tinyint DEFAULT NULL,
    ->   `create_time` datetime DEFAULT NULL,
    ->   `update_time` datetime DEFAULT NULL,
    ->   PRIMARY KEY (`id`),
    ->   KEY `idx_name` (`name`),
    ->   KEY `idx_age` (`age`)
    -> ) ENGINE=InnoDB AUTO_INCREMENT=1091002 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
Query OK, 0 rows affected (0.16 sec)

4.卸载新表表空间

[root@GreatSQL][test02]>ALTER table t_user discard tablespace;
Query OK, 0 rows affected (0.11 sec)

5.拷贝备份的t_user文件

[root@localhost test]# cd /data/backup/test/
[root@localhost test2]# cp * /data/GreatSQL/test02/
[root@localhost test2]# ll
-rw-r--r-- 1 root root      964 Nov 24 04:12 t_user.cfg
-rw-r----- 1 root root 18874368 Nov 24 04:10 t_user.ibd

6.挂载新表表空间

[root@GreatSQL][test02]>ALTER TABLE t_user import tablespace;
Query OK, 0 rows affected, 1 warning (0.47 sec)

7.查询恢复数据

[root@GreatSQL][test02]>select count(*) from test02.t_user;
+----------+
| count(*) |
+----------+
|    91002 |
+----------+
1 row in set (0.10 sec)
# 旧表的数据
[root@GreatSQL][test02]>select count(*) from test.t_user;
+----------+
| count(*) |
+----------+
|    91002 |
+----------+
1 row in set (0.07 sec)

(Wed Nov 24 21:35:57 2021)[root@GreatSQL][test02]>

Enjoy GreatSQL :)