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‎src/UserGuide/Master/Table/Reference/System-Tables_apache.md‎

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IoTDB has a built-in system database called `INFORMATION_SCHEMA`, which contains a series of system tables for storing IoTDB runtime information (such as currently executing SQL statements, etc.). Currently, the `INFORMATION_SCHEMA` database only supports read operations.
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> 💡 **[V2.0.8-beta Version Update]**<br>
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> 👉 Added four system tables: **[CONNECTIONS](#_2-18-connections)** (real-time connection tracking), **[CURRENT_QUERIES](#_2-19-current-queries)** (active query monitoring), **[QUERIES_COSTS_HISTOGRAM](#_2-20-queries-costs-histogram)** (query latency distribution), **[SERVICES](#_2-21-services)** (service status management), enhancing cluster maintenance and performance analysis.
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## 1. System Database
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* ​**Name**​: `INFORMATION_SCHEMA`

‎src/UserGuide/Master/Table/Reference/System-Tables_timecho.md‎

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IoTDB has a built-in system database called `INFORMATION_SCHEMA`, which contains a series of system tables for storing IoTDB runtime information (such as currently executing SQL statements, etc.). Currently, the `INFORMATION_SCHEMA` database only supports read operations.
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> 💡 **[V2.0.8 Version Update]**<br>
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> 👉 Added four system tables: **[CONNECTIONS](#_2-18-connections)** (real-time connection tracking), **[CURRENT_QUERIES](#_2-19-current-queries)** (active query monitoring), **[QUERIES_COSTS_HISTOGRAM](#_2-20-queries-costs-histogram)** (query latency distribution), **[SERVICES](#_2-21-services)** (service status management), enhancing cluster maintenance and performance analysis.
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> 💡 **[V2.0.8.2 Version Update]**<br>
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> 👉 Added onw system tables: **[SERVICES](#_2-21-services)** (service status management), enhancing cluster maintenance and performance analysis.
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## 1. System Database
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### 2.21 SERVICES
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> This system table is available starting from version V 2.0.8
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> This system table is available starting from version V 2.0.8.2
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* Displays services (MQTT service, REST service) on all active DataNodes (with RUNNING or READ-ONLY status).
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* Table structure:

‎src/UserGuide/Master/Table/User-Manual/Maintenance-commands_timecho.md‎

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**Description**: Returns service information (MQTT service, REST service) on all active DataNodes (in RUNNING or READ-ONLY state) in the current cluster.
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> Supported since V2.0.8
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> Supported since V2.0.8.2
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#### Syntax:
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```sql

‎src/UserGuide/Master/Tree/User-Manual/Maintenance-commands_timecho.md‎

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**Description**: Returns service information (MQTT service, REST service) on all active DataNodes (in RUNNING or READ-ONLY state) in the current cluster.
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> This feature is supported starting from v2.0.8.
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> This feature is supported starting from v2.0.8.2.
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#### Syntax:
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```sql

‎src/UserGuide/latest-Table/Reference/System-Tables_apache.md‎

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IoTDB has a built-in system database called `INFORMATION_SCHEMA`, which contains a series of system tables for storing IoTDB runtime information (such as currently executing SQL statements, etc.). Currently, the `INFORMATION_SCHEMA` database only supports read operations.
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> 💡 **[V2.0.8-beta Version Update]**<br>
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> 👉 Added four system tables: **[CONNECTIONS](#_2-18-connections)** (real-time connection tracking), **[CURRENT_QUERIES](#_2-19-current-queries)** (active query monitoring), **[QUERIES_COSTS_HISTOGRAM](#_2-20-queries-costs-histogram)** (query latency distribution), **[SERVICES](#_2-21-services)** (service status management), enhancing cluster maintenance and performance analysis.
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## 1. System Database
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* ​**Name**​: `INFORMATION_SCHEMA`

‎src/UserGuide/latest-Table/Reference/System-Tables_timecho.md‎

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IoTDB has a built-in system database called `INFORMATION_SCHEMA`, which contains a series of system tables for storing IoTDB runtime information (such as currently executing SQL statements, etc.). Currently, the `INFORMATION_SCHEMA` database only supports read operations.
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> 💡 **[V2.0.8 Version Update]**<br>
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> 👉 Added four system tables: **[CONNECTIONS](#_2-18-connections)** (real-time connection tracking), **[CURRENT_QUERIES](#_2-19-current-queries)** (active query monitoring), **[QUERIES_COSTS_HISTOGRAM](#_2-20-queries-costs-histogram)** (query latency distribution), **[SERVICES](#_2-21-services)** (service status management), enhancing cluster maintenance and performance analysis.
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> 💡 **[V2.0.8.2 Version Update]**<br>
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> 👉 Added onw system tables: **[SERVICES](#_2-21-services)** (service status management), enhancing cluster maintenance and performance analysis.
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## 1. System Database
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### 2.21 SERVICES
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> This system table is available starting from version V 2.0.8
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> This system table is available starting from version V 2.0.8.2
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* Displays services (MQTT service, REST service) on all active DataNodes (with RUNNING or READ-ONLY status).
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* Table structure:

‎src/UserGuide/latest-Table/User-Manual/Maintenance-commands_timecho.md‎

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**Description**: Returns service information (MQTT service, REST service) on all active DataNodes (in RUNNING or READ-ONLY state) in the current cluster.
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> Supported since V2.0.8
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> Supported since V2.0.8.2
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#### Syntax:
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```sql

‎src/UserGuide/latest/User-Manual/Maintenance-commands_timecho.md‎

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**Description**: Returns service information (MQTT service, REST service) on all active DataNodes (in RUNNING or READ-ONLY state) in the current cluster.
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> This feature is supported starting from v2.0.8.
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> This feature is supported starting from v2.0.8.2.
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#### Syntax:
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```sql

‎src/zh/UserGuide/Master/Table/Reference/System-Tables_apache.md‎

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IoTDB 内置系统数据库 `INFORMATION_SCHEMA`，其中包含一系列系统表，用于存储 IoTDB 运行时信息（如当前正在执行的 SQL 语句等）。目前`INFORMATION_SCHEMA`数据库只支持读操作。
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> 💡 **【V2.0.8-beta 版本更新】**<br>
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> 👉 新增四张系统表：**[CONNECTIONS](../Reference/System-Tables_timecho.md#_2-18-connections-表)**（实时连接追踪）、**[CURRENT\_QUERIES](#_2-19-current-queries-表)**（活跃查询监控）、**[QUERIES\_COSTS\_HISTOGRAM](#_2-20-queries-costs-histogram-表)**（查询耗时分布）、**[SERVICES](#_2-21-services-表)**（服务状态管理），助力集群运维与性能分析。
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## 1. 系统库
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* 名称：`INFORMATION_SCHEMA`

‎src/zh/UserGuide/Master/Table/Reference/System-Tables_timecho.md‎

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IoTDB 内置系统数据库 `INFORMATION_SCHEMA`，其中包含一系列系统表，用于存储 IoTDB 运行时信息（如当前正在执行的 SQL 语句等）。目前`INFORMATION_SCHEMA`数据库只支持读操作。
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> 💡 **【V2.0.8 版本更新】**<br>
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> 👉 新增四张系统表：**[CONNECTIONS](../Reference/System-Tables_timecho.md#_2-18-connections-表)**（实时连接追踪）、**[CURRENT\_QUERIES](#_2-19-current-queries-表)**（活跃查询监控）、**[QUERIES\_COSTS\_HISTOGRAM](#_2-20-queries-costs-histogram-表)**（查询耗时分布）、**[SERVICES](#_2-21-services-表)**（服务状态管理），助力集群运维与性能分析。
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> 💡 **【V2.0.8.2 版本更新】**<br>
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> 👉 新增一张系统表：**[SERVICES](#_2-21-services-表)**（服务状态管理），助力集群运维与性能分析。
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## 1. 系统库
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### 2.21 SERVICES 表
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> 该系统表从 V 2.0.8 版本开始提供
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> 该系统表从 V 2.0.8.2 版本开始提供
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* 可展示所有正常工作（RUNNING 或 READ-ONLY） DN 上的服务（MQTT 服务、REST 服务）。
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* 表结构如下表所示：

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