[MySQL 6.0 体验] 集群(cluster)+复制(replicate) -- 备份、恢复

6. 备份、恢复

6.1. 备份

集群的备份很简单，只需在管理节点上执行START BACKUP 即可：

ndb_mgm> START BACKUP
Waiting for completed, this may take several minutes
Node 3: Backup 4 started from node 1
Node 3: Backup 4 started from node 1 completed
 StartGCP: 7847 StopGCP: 7850
 #Records: 1736024 #LogRecords: 0
 Data: 41649824 bytes Log: 0 bytes

6.2. 恢复

来做个实际的测试，在SQL节点上先制造一些数据出来：

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| a              |
+----------------+
1 row in set (0.01 sec)

mysql> show create table a;
+-------+-------------------------------------------------------------------------------------------+
| Table | Create Table                                                                              |
+-------+-------------------------------------------------------------------------------------------+
| a     | CREATE TABLE `a` (
  `id` int(11) DEFAULT NULL
) ENGINE=ndbcluster DEFAULT CHARSET=latin1 |
+-------+-------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

mysql> select count(*) from a;
+----------+
| count(*) |
+----------+
|  1733965 |
+----------+
1 row in set (0.03 sec)

mysql> checksum table a;
+--------+------------+
| Table  | Checksum   |
+--------+------------+
| test.a | 1641855839 |
+--------+------------+
1 row in set (11.61 sec)

然后用上面提到的方法进行备份后，删除该表的数据：

mysql> truncate table a;
Query OK, 0 rows affected (0.68 sec)

接下来在2个数据节点上分别执行以下命令恢复数据：

/usr/local/mysql/bin/ndb_restore -n 3 -b 5 -r data/BACKUP/BACKUP-3
Nodeid = 3
Backup Id = 5
backup path = data/BACKUP/BACKUP-5
Opening file 'data/BACKUP/BACKUP-5/BACKUP-5.3.ctl'
File size 8120 bytes
Ndb version in backup files: ndb-6.2.6
Connected to ndb!!
Opening file 'data/BACKUP/BACKUP-5/BACKUP-5-0.3.Data'
File size 20809008 bytes
_____________________________________________________
Processing data in table: sys/def/NDB$EVENTS_0(1) fragment 0
_____________________________________________________
Processing data in table: test/def/a(5) fragment 0
_____________________________________________________
Processing data in table: mysql/def/ndb_apply_status(4) fragment 0
_____________________________________________________
Processing data in table: mysql/def/NDB$BLOB_2_3(3) fragment 0
_____________________________________________________
Processing data in table: sys/def/SYSTAB_0(0) fragment 0
_____________________________________________________
Processing data in table: mysql/def/ndb_schema(2) fragment 0
Opening file 'data/BACKUP/BACKUP-5/BACKUP-5.3.log'
File size 44 bytes
Restored 866287 tuples and 0 log entries

NDBT_ProgramExit: 0 - OK

再在SQL节点上查一下：

mysql> select count(*) from a;
+----------+
| count(*) |
+----------+
|   866287 |
+----------+
1 row in set (0.00 sec)

然后在另一个数据节点上执行恢复。

/usr/local/mysql/bin/ndb_restore -n 4 -b 5 -r data/BACKUP/BACKUP-3
Nodeid = 4
Backup Id = 5
backup path = data/BACKUP/BACKUP-5
Opening file 'data/BACKUP/BACKUP-5/BACKUP-5.4.ctl'
File size 8120 bytes
Ndb version in backup files: ndb-6.2.6
Connected to ndb!!
Opening file 'data/BACKUP/BACKUP-5/BACKUP-5-0.4.Data'
File size 20841232 bytes
_____________________________________________________
Processing data in table: sys/def/NDB$EVENTS_0(1) fragment 1
_____________________________________________________
Processing data in table: test/def/a(5) fragment 1
_____________________________________________________
Processing data in table: mysql/def/ndb_apply_status(4) fragment 1
_____________________________________________________
Processing data in table: mysql/def/NDB$BLOB_2_3(3) fragment 1
_____________________________________________________
Processing data in table: sys/def/SYSTAB_0(0) fragment 1
_____________________________________________________
Processing data in table: mysql/def/ndb_schema(2) fragment 1
Opening file 'data/BACKUP/BACKUP-5/BACKUP-5.4.log'
File size 44 bytes
Restored 867678 tuples and 0 log entries

NDBT_ProgramExit: 0 – OK

再来查一次看看：

mysql> checksum table a;      
+--------+------------+
| Table  | Checksum   |
+--------+------------+
| test.a | 1641855839 |
+--------+------------+
1 row in set (11.62 sec)

恢复完毕。