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ORA-24817: Unable to allocate the given chunk for current lob operation ORACLE 报错 故障修复 远程处理

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ORA-24817: Unable to allocate the given chunk for current lob operation ORACLE 报错 故障修复 远程处理

文档解释

ORA-24817: Unable to allocate the given chunk for current lob operation

Cause: The given size is increased to accomodate the number of bytes from server due to varying width db char/nchar set.

Action: Use smaller chunk sizes when you have character set conversion between client/server or perform piece-wise read or write.

ORA-24817: Unable to allocate the given chunk for current lob operation 表示Oracle数据库在当前LOB操作的过程中无法分配指定的块。

该错误的官方解释是:“尝试在源释放块之前无法分配所请求的内部LOB块”。

常见案例

这种错误通常会在Oracle数据库尝试执行大型表复制操作(例如alter table move)以及在执行大型索引和索引维护操作时出现。

正常处理方法及步骤

1.确保表中的行数不超过32万。如果超出了该范围,应当将其分割为小型表和索引。

2.确保表中每行的宽度(其中包括LOB列)不超过4KB。如果超出了该范围,应当使用BLOB字段将其分割。

3.重命名SYS.I_LOB*表,其中*是正在处理的表的ID,以确保在更新时不会出错。

4.重建表或索引,以更新其LOB索引,此时此数据库管理员应强制使用KEEP_EXISTING_LOB参数。

5.检查存在的表大小配置是否满足表上每个字段的实际需求,并优化表的配置。

6.使用DBMS_SPACE_ADMIN包重建空间申请器,如果数据表的空间碎片太多,将可能出现上述问题。

7.将数据文件扩展到更大的磁盘空间,以容纳更多的数据。

8.如果此问题继续出现,则可以将表中的LOB数据移动到具有更大表空间的其他数据库。一旦LOB数据被移动,表空间就可以重新调整以符合需求。

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ORA-24817: Unable to allocate the given chunk for current lob operation ORACLE 报错 故障修复 远程处理

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