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update MD by dispatch event pingcap/docs-cn release-8.5
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markdown-pages/zh/tidb/release-8.5/mysql-schema/mysql-schema.md

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@@ -108,6 +108,10 @@ summary: 了解 TiDB 系统表。
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* `request_unit_by_group` 存放资源组 RU 消耗统计的历史记录
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## 备份和恢复相关系统表
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* `tidb_pitr_id_map` 存储时间点恢复 (Point-in-time recovery, PITR) 操作的 ID 映射信息
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## 其它系统表
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* `GLOBAL_VARIABLES` 全局系统变量表

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