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Update 23-perf.md

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docs/zh/12-taos-sql/23-perf.md
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@ -3,7 +3,7 @@ sidebar_label: 统计数据
title: 存储统计数据的 Performance_Schema 数据库
---
TDengine 3.0 版本开始提供一个内置数据库 `performance_schema`，其中存储了与性能有关的统计数据。本节详细介绍其中的表和详细的表结构。
TDengine 3.0 版本开始提供一个内置数据库 `performance_schema`，其中存储了与性能有关的统计数据。本节详细介绍其中的表和表结构。
## PERF_APP