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This topic has been translated from a Chinese forum by GPT and might contain errors.Original topic: 添加索引报错问题
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username: 希希希望啊
[TiDB Usage Environment] Production Environment
[TiDB Version] 7.1.3
[Reproduction Path] Adding Index
[Encountered Problem: Phenomenon and Impact] ALTER TABLE ddacare.row_info
ADD INDEX INDEX_ID(id);
[Resource Configuration] Go to TiDB Dashboard - Cluster Info - Hosts and take a screenshot of this page
[Attachment: Screenshot/Log/Monitoring]
This is an old issue, refer to:
If you have any questions, you can search the forum first, most of the problems have already been encountered by others.
The person above posted a link that perfectly solves the problem.
The space in the directory /tmp/tidb/tmp_ddl-4000 is not enough.
It seems the issue is an error indicating insufficient disk space. 
Insufficient disk space, I have also encountered index corruption before.
I encountered this locally, and it didn’t seem to be related to disk space. It was resolved after reinstalling.
No directory or the current user does not have permission.
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