br: sys collation check by Leavrth · Pull Request #21306 · pingcap/docs-cn

Leavrth · 2026-01-30T07:02:28Z

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Signed-off-by: Jianjun Liao <jianjun.liao@outlook.com>

br/backup-and-restore-overview.md

BornChanger · 2026-02-05T13:58:34Z

br/backup-and-restore-overview.md

-> 已知问题：从 v7.2.0 版本开始，新建集群的部分系统表字段变为大小写不敏感。然而，对于从 v7.2.0 之前的版本**在线升级**到 v7.2.0 及以上版本的集群，对应的系统表字段仍然大小写敏感。如果在这两类集群之间进行包含系统表的备份和恢复操作，可能会失败。详情参见 [Issue #43717](https://github.com/pingcap/tidb/issues/43717)。
+> - 已知问题：从 v7.2.0 开始，新建集群的部分系统表字段变为大小写不敏感。然而，对于从 v7.2.0 之前的版本**在线升级**到 v7.2.0 及以上版本的集群，对应的系统表字段仍然大小写敏感。如果在这两类集群之间进行包含系统表的备份和恢复操作，可能会失败。详情参见 [Issue #43717](https://github.com/pingcap/tidb/issues/43717)。
+>
+> - 从 v8.5.5 开始，如果旧集群系统表中不存在大小写冲突的记录（例如同时存在 `test.t1` 和 `test.T1`），在恢复时可以指定 BR 参数 `--sys-check-collation`。BR 会检查系统表数据在不同排序规则 (Collation) 下的兼容性：如果兼容，则可以成功恢复来自旧版本的备份；如果不兼容，则 BR 会报错并终止恢复。


客户如何把你的建议落地呢？

如何检查大小写冲突的记录？

直接无脑设置 --sys-check-collation 有什么危害么？

Signed-off-by: Jianjun Liao <jianjun.liao@outlook.com>

br/backup-and-restore-overview.md

ti-chi-bot · 2026-02-13T01:17:08Z

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2026-02-13 01:17:08.089077095 +0000 UTC m=+153981.169067800: ☑️ agreed by hfxsd.

br/backup-and-restore-overview.md

…s-cn into pr/21306

ti-chi-bot · 2026-02-13T06:17:36Z

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hfxsd · 2026-02-13T07:07:27Z

/approve

ti-chi-bot · 2026-02-13T07:07:35Z

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ti-chi-bot · 2026-02-13T07:13:38Z

In response to a cherrypick label: new pull request created to branch release-8.5: #21364.

sys collation check

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Signed-off-by: Jianjun Liao <jianjun.liao@outlook.com>

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hfxsd added translation/done This PR has been translated from English into Chinese and updated to pingcap/docs-cn in a PR. and removed missing-translation-status This PR does not have translation status info. labels Feb 5, 2026

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br: sys collation check pingcap/docs#22387

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br: sys collation check (#22387) pingcap/docs#22462

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br: sys collation check (#21306) #21364

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br: sys collation check (pingcap#21306)

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br: sys collation check (#21306) (#21364)

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br: sys collation check (#22387) (#22462) pingcap/docs#22463

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Leavrth commented Jan 30, 2026 •

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Leavrth commented Jan 30, 2026 •

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