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Add tidb index usage limitation for valid stats #20249

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Add tidb index usage limitation for valid stats #20249

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1 change: 1 addition & 0 deletions information-schema/information-schema-tidb-index-usage.md
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Expand Up @@ -91,6 +91,7 @@ DESC CLUSTER_TIDB_INDEX_USAGE;

- `TIDB_INDEX_USAGE` 表中的数据可能存在最多 5 分钟的延迟。
- 在 TiDB 重启后，`TIDB_INDEX_USAGE` 表中的数据会被清空。
- 只有在表具有有效统计信息时，TiDB 才会记录该表的索引使用情况。

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