doris：恢复

前提条件​

1. 确保您拥有管理员权限以执行恢复操作。
2. 确保您有一个有效的备份快照可供恢复，请参考备份。

1. 获取快照的备份时间戳​

以下 SQL 语句可用于查看名为example_repo的 Repository 中的现有备份。

mysql> SHOW SNAPSHOT ON example_repo;
+-----------------+---------------------+--------+
| Snapshot            | Timestamp              | Status   |
+-----------------+---------------------+--------+
| exampledb_20241225 | 2022-04-08-15-52-29 | OK     |
+-----------------+---------------------+--------+
1 row in set (0.15 sec)

2. 从快照恢复​

Option 1：恢复快照到当前数据库​

以下 SQL 语句从名为example_repo的 Repository 中恢复标签为 restore_label1 和时间戳为 2022-04-08-15-52-29 的快照到当前数据库。

RESTORE SNAPSHOT `restore_label1`
FROM `example_repo`
PROPERTIES
(
    "backup_timestamp"="2022-04-08-15-52-29"
);

Option 2：恢复快照到指定数据库​

以下 SQL 语句从名为example_repo的 Repository 中恢复标签为 restore_label1 和时间戳为 2022-04-08-15-52-29 的快照到名为 destdb 的数据库。

RESTORE SNAPSHOT destdb.`restore_label1`
FROM `example_repo`
PROPERTIES
(
    "backup_timestamp"="2022-04-08-15-52-29"
);

Option 3：从快照恢复单个表​

从example_repo中的快照恢复表backup_tbl到当前数据库，快照的标签为 restore_label1，时间戳为 2022-04-08-15-52-29。

RESTORE SNAPSHOT `restore_label1`
FROM `example_repo`
ON ( `backup_tbl` )
PROPERTIES
(
    "backup_timestamp"="2022-04-08-15-52-29"
);

Option 4：从快照恢复分区和表​

从example_repo中的备份快照snapshot_2恢复表backup_tbl的分区 p1 和 p2，以及表backup_tbl2到当前数据库example_db1，并将其重命名为new_tbl，快照标签为时间版本为"2018-05-04-17-11-01"。

RESTORE SNAPSHOT `restore_label1`
FROM `example_repo`
ON
(
    `backup_tbl` PARTITION (`p1`, `p2`),
    `backup_tbl2` AS `new_tbl`
)
PROPERTIES
(
    "backup_timestamp"="2022-04-08-15-55-43"
);

3. 查看恢复作业的执行情况​

```sql
mysql> SHOW RESTORE\G;
*************************** 1. row ***************************
              JobId: 17891851
              Label: snapshot_label1
          Timestamp: 2022-04-08-15-52-29
              DbName: default_cluster:example_db1
              State: FINISHED
          AllowLoad: false
      ReplicationNum: 3
        RestoreObjs: {
  "name": "snapshot_label1",
  "database": "example_db",
  "backup_time": 1649404349050,
  "content": "ALL",
  "olap_table_list": [
    {
      "name": "backup_tbl",
      "partition_names": [
        "p1",
        "p2"
      ]
    }
  ],
  "view_list": [],
  "odbc_table_list": [],
  "odbc_resource_list": []
}
          CreateTime: 2022-04-08 15:59:01
    MetaPreparedTime: 2022-04-08 15:59:02
SnapshotFinishedTime: 2022-04-08 15:59:05
DownloadFinishedTime: 2022-04-08 15:59:12
        FinishedTime: 2022-04-08 15:59:18
    UnfinishedTasks:
            Progress:
          TaskErrMsg:
              Status: [OK]
            Timeout: 86400
1 row in set (0.01 sec)
```