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ORA-22999: CLOB or NCLOB data may have been corrupted ORACLE 报错 故障修复 远程处理

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ORA-22999: CLOB or NCLOB data may have been corrupted ORACLE 报错 故障修复 远程处理

文档解释

ORA-22999: CLOB or NCLOB data may have been corrupted

Cause: CLOB or NCLOB contains invalid character data. One possible cause is that the wrong csid was specified for the external file when calling DBMS_LOB.LOADCLOBFROMFILE or DBMS_XSLPROCESSOR.READ2CLOB to load CLOB or NCLOB data from external files.

Action: Reload the CLOB/NCLOB data with the correct csid specified for the external file.

ORA-22999错误通常是由于CLOB或NCLOB字段(Character Large Objects和National Character Large Objects)存储的数据可能已损坏所致。

ORA-22999 在运行一些操作时出现,例如复制数据、插入或更新数据,或无法更新表中的CLOB和NCLOB字段,以及在使用ALTER TABLE命令添加超过4000字节的CLOB字段时。

官方解释

该错误可能表示服务器中的CLOB,NCLOB或未知文本对象可能已损坏,或可能不能支持此操作。

常见案例

1、在从一个表插入另一个表的CLOB或NCLOB字段时出现ORA-22999错误。

2、当从一个旧版本升级到一个新版本时,表中有6个CLOB字段,而每个都大于4000个字符,即使用ALTER TABLE命令添加超过4000字节的CLOB字段时,也会出现ORA-22999错误。

一般处理方法及步骤

1、首先,尝试查找字段的可能问题,并且可能需要以某种方式来检修字段。

2、检查表中的连续性,以确保符合表上的约束,以避免实际损坏数据。

3、使用系统表 SYS.DBA_LOBS 检查这些字段,以确定显示正确的长度和类型

4、其次,在可能的情况下尝试做如下优化:

Update锁定,使用UPDATE compilatie = LENGTH (compilatie);

可以考虑重置残缺或损坏的数据字段。

5、可以根据系统需要,使用SYS.DBMS_LOB.COPY函数来替换可能损坏的字段中的源大对象(LOB)和新的LOB。

6、避免在服务器中读取CLOB,NCLOB,BLOB或BFILE对象时使用SELECT语句,因为为了对对象做一些基本操作,Oracle Server需要将CLOB NBLOB和BFILE数据转换为临时表,NCHAR,NVARHAR或BARRAY,因此此操作会花费很多时间,并可能会遇到此错误。

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ORA-22999: CLOB or NCLOB data may have been corrupted ORACLE 报错 故障修复 远程处理

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