该表提供了一种方法来查找该集群中最近启动的备份的 ID。

backup_id 表包含一个单列 id，对应于使用 ndb_mgm 客户端 START BACKUP 命令获取的备份 ID。该表包含一行。

示例：假设在 NDB 管理客户端中发出以下序列的 START BACKUP 命令，自集群启动以来没有其他备份：

ndb_mgm> START BACKUP
Waiting for completed, this may take several minutes
Node 5: Backup 1 started from node 50
Node 5: Backup 1 started from node 50 completed
 StartGCP: 27894 StopGCP: 27897
 #Records: 2057 #LogRecords: 0
 Data: 51580 bytes Log: 0 bytes
ndb_mgm> START BACKUP 5
Waiting for completed, this may take several minutes
Node 5: Backup 5 started from node 50
Node 5: Backup 5 started from node 50 completed
 StartGCP: 27905 StopGCP: 27908
 #Records: 2057 #LogRecords: 0
 Data: 51580 bytes Log: 0 bytes
ndb_mgm> START BACKUP
Waiting for completed, this may take several minutes
Node 5: Backup 6 started from node 50
Node 5: Backup 6 started from node 50 completed
 StartGCP: 27912 StopGCP: 27915
 #Records: 2057 #LogRecords: 0
 Data: 51580 bytes Log: 0 bytes
ndb_mgm> START BACKUP 3
Connected to Management Server at: localhost:1186
Waiting for completed, this may take several minutes
Node 5: Backup 3 started from node 50
Node 5: Backup 3 started from node 50 completed
 StartGCP: 28149 StopGCP: 28152
 #Records: 2057 #LogRecords: 0
 Data: 51580 bytes Log: 0 bytes
ndb_mgm>

之后，backup_id 表将包含以下单行，使用 mysql 客户端：

mysql> USE ndbinfo;

Database changed
mysql> SELECT * FROM backup_id;
+------+
| id   |
+------+
|    3 |
+------+
1 row in set (0.00 sec)

如果找不到备份，该表将包含一行，id 值为 0。