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+
+title = "Mogdb备机处于standby need-repair(WAL)状态怎么处理" 
+
+date = "2023-04-30" 
+
+tags = ["openGauss安装"] 
+
+archives = "2023-04" 
+
+author = "张翠娉" 
+
+summary = "Mogdb备机处于standby need-repair(WAL)状态怎么处理"
+
+img = "/zh/post/zhangcuiping/title/img.png" 
+
+times = "14:20"
+
++++
+
+# Mogdb备机处于standby need-repair状态怎么处理？
+
+**背景介绍**：
+
+Mogdb主备环境，备机检查发现Standby Need repair故障。
+
+**报错原因**：
+
+因网络故障、磁盘满等原因造成主备实例连接断开，主备日志不同步，导致数据库集群在启动时异常。
+
+**主备状态检查**：
+
+```bash
+[root@hostname data]# ptk cluster -n mogdb12 status
+[   Cluster State   ]
+cluster_name                            : mogdb12
+cluster_state                           : Degraded
+database_version                        : MogDB 3.0.0 (build 62408a0f)
+
+[  Datanode State   ]
+  cluster_name |  id  |      ip      | port  | user  | nodename | db_role |               state                | upstream  
+---------------+------+--------------+-------+-------+----------+---------+------------------------------------+-----------
+  mogdb12      | 6001 | 172.16.0.245 | 26007 | omm12 | dn_6001  | primary | Normal                             | -         
+               | 6002 | 172.16.0.127 | 26007 | omm12 | dn_6002  | standby | Need repair(System id not matched) | -         
+```
+
+**解决办法**：
+
+通过gs_ctl build -D 命令对故障节点进行重建。在此例中我们切换到need repair的主机上，执行如下命令进行修复：
+
+```
+gs_ctl build -D /home/omm12/mogdb/data
+```
+
+**恢复后主备状态检查**：
+
+```
+[root@hostname data]# ptk cluster -n mogdb12 status
+[   Cluster State   ]
+cluster_name                            : mogdb12
+cluster_state                           : Normal
+database_version                        : MogDB 3.0.0 (build 62408a0f)
+
+[  Datanode State   ]
+  cluster_name |  id  |      ip      | port  | user  | nodename | db_role | state  | upstream  
+---------------+------+--------------+-------+-------+----------+---------+--------+-----------
+  mogdb12      | 6001 | 172.16.0.245 | 26007 | omm12 | dn_6001  | primary | Normal | -         
+               | 6002 | 172.16.0.127 | 26007 | omm12 | dn_6002  | standby | Normal | -      
+```
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