<!--

    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at
    
        http://www.apache.org/licenses/LICENSE-2.0
    
    Unless required by applicable law or agreed to in writing,
    software distributed under the License is distributed on an
    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    KIND, either express or implied.  See the License for the
    specific language governing permissions and limitations
    under the License.

-->

# 运维语句

## 1.  状态查看

### 1.1 查看当前的树/表模型

**语法：**

```SQL
showCurrentSqlDialectStatement
    : SHOW CURRENT_SQL_DIALECT
    ;
```

**示例：**

```SQL
IoTDB> SHOW CURRENT_SQL_DIALECT
+-----------------+
|CurrentSqlDialect|
+-----------------+
|            TABLE|
+-----------------+
```

### 1.2 查看登录的用户名

**语法：**

```SQL
showCurrentUserStatement
    : SHOW CURRENT_USER
    ;
```

**示例：**

```SQL
IoTDB> SHOW CURRENT_USER
+-----------+
|CurrentUser|
+-----------+
|       root|
+-----------+
```

### 1.3 查看连接的数据库名

**语法：**

```SQL
showCurrentDatabaseStatement
    : SHOW CURRENT_DATABASE
    ;
```

**示例：**

```SQL
IoTDB> SHOW CURRENT_DATABASE;
+---------------+
|CurrentDatabase|
+---------------+
|           null|
+---------------+

IoTDB> USE test;

IoTDB> SHOW CURRENT_DATABASE;
+---------------+
|CurrentDatabase|
+---------------+
|           test|
+---------------+
```

### 1.4 查看集群版本

**语法：**

```SQL
showVersionStatement
    : SHOW VERSION
    ;
```

**示例：**

```SQL
IoTDB> SHOW VERSION
+-------+---------+
|Version|BuildInfo|
+-------+---------+
|2.0.1.2|  1ca4008|
+-------+---------+
```

### 1.5 查看集群关键参数

**语法：**

```SQL
showVariablesStatement
    : SHOW VARIABLES
    ;
```

**示例：**

```SQL
IoTDB> SHOW VARIABLES
+----------------------------------+-----------------------------------------------------------------+
|                          Variable|                                                            Value|
+----------------------------------+-----------------------------------------------------------------+
|                       ClusterName|                                                   defaultCluster|
|             DataReplicationFactor|                                                                1|
|           SchemaReplicationFactor|                                                                1|
|  DataRegionConsensusProtocolClass|                      org.apache.iotdb.consensus.iot.IoTConsensus|
|SchemaRegionConsensusProtocolClass|                  org.apache.iotdb.consensus.ratis.RatisConsensus|
|  ConfigNodeConsensusProtocolClass|                  org.apache.iotdb.consensus.ratis.RatisConsensus|
|               TimePartitionOrigin|                                                                0|
|             TimePartitionInterval|                                                        604800000|
|              ReadConsistencyLevel|                                                           strong|
|           SchemaRegionPerDataNode|                                                                1|
|             DataRegionPerDataNode|                                                                0|
|                     SeriesSlotNum|                                                             1000|
|           SeriesSlotExecutorClass|org.apache.iotdb.commons.partition.executor.hash.BKDRHashExecutor|
|         DiskSpaceWarningThreshold|                                                             0.05|
|                TimestampPrecision|                                                               ms|
+----------------------------------+-----------------------------------------------------------------+
```

### 1.6 查看集群ID

**语法：**

```SQL
showClusterIdStatement
    : SHOW (CLUSTERID | CLUSTER_ID)
    ;
```

**示例：**

```SQL
IoTDB> SHOW CLUSTER_ID
+------------------------------------+
|                           ClusterId|
+------------------------------------+
|40163007-9ec1-4455-aa36-8055d740fcda|
```

### 1.7 查看服务器的时间

查看客户端直连的 DataNode 进程所在的服务器的时间

**语法：**

```SQL
showCurrentTimestampStatement
    : SHOW CURRENT_TIMESTAMP
    ;
```

**示例：**

```SQL
IoTDB> SHOW CURRENT_TIMESTAMP
+-----------------------------+
|             CurrentTimestamp|
+-----------------------------+
|2025-02-17T11:11:52.987+08:00|
+-----------------------------+
```

### 1.8 查看分区信息

**语法：**

```SQL
showRegionsStatement
    : SHOW REGIONS
    ;
```

**示例：**

```SQL
IoTDB> SHOW REGIONS
+--------+------------+-------+----------+-------------+-----------+----------+----------+-------+---------------+------+-----------------------+----------+
|RegionId|        Type| Status|  Database|SeriesSlotNum|TimeSlotNum|DataNodeId|RpcAddress|RpcPort|InternalAddress|  Role|             CreateTime|TsFileSize|
+--------+------------+-------+----------+-------------+-----------+----------+----------+-------+---------------+------+-----------------------+----------+
|       6|SchemaRegion|Running|tcollector|          670|          0|         1|   0.0.0.0|   6667|      127.0.0.1|Leader|2025-08-01T17:37:01.194|          |
|       7|  DataRegion|Running|tcollector|          335|        335|         1|   0.0.0.0|   6667|      127.0.0.1|Leader|2025-08-01T17:37:01.196| 169.85 KB|
|       8|  DataRegion|Running|tcollector|          335|        335|         1|   0.0.0.0|   6667|      127.0.0.1|Leader|2025-08-01T17:37:01.198| 161.63 KB|
+--------+------------+-------+----------+-------------+-----------+----------+----------+-------+---------------+------+-----------------------+----------+
```

### 1.9 查看可用节点

> V2.0.8 起支持该功能

**语法：**

```SQL
showAvailableUrlsStatement
    : SHOW AVAILABLE URLS
    ;
```

**示例：**

```SQL
IoTDB> SHOW AVAILABLE URLS
+----------+-------+
|RpcAddress|RpcPort|
+----------+-------+
|   0.0.0.0|   6667|
+----------+-------+
```

### 1.10 查看服务信息

> V2.0.8.2 起支持该功能

**语法：**

```SQL
showServicesStatement
    : SHOW SERVICES <ON dataNodeId>
    ;
```

**示例：**

```SQL
IoTDB> SHOW SERVICES
IoTDB> SHOW SERVICES ON 1
+------------+-----------+-------+
|service_name|datanode_id|  state|
+------------+-----------+-------+
|        MQTT|          1|STOPPED|
|        REST|          1|RUNNING|
+------------+-----------+-------+
```

### 1.11 查看集群激活状态 

**语法：**

```SQL
showActivationStatement
    : SHOW ACTIVATION
    ;
```

**示例：**

```SQL
IoTDB> SHOW ACTIVATION
+---------------+---------+-----------------------------+
|    LicenseInfo|    Usage|                        Limit|
+---------------+---------+-----------------------------+
|         Status|ACTIVATED|                            -|
|    ExpiredTime|        -|2026-04-30T00:00:00.000+08:00|
|  DataNodeLimit|        1|                    Unlimited|
|       CpuLimit|       16|                    Unlimited|
|    DeviceLimit|       30|                    Unlimited|
|TimeSeriesLimit|       72|                1,000,000,000|
+---------------+---------+-----------------------------+
```


## 2. 状态设置

### 2.1 设置连接的树/表模型

**语法：**

```SQL
SET SQL_DIALECT EQ (TABLE | TREE)
```

**示例：**

```SQL
IoTDB> SET SQL_DIALECT=TABLE
IoTDB> SHOW CURRENT_SQL_DIALECT
+-----------------+
|CurrentSqlDialect|
+-----------------+
|            TABLE|
+-----------------+
```

### 2.2 更新配置项

**语法：**

```SQL
setConfigurationStatement
    : SET CONFIGURATION propertyAssignments (ON INTEGER_VALUE)?
    ;

propertyAssignments
    : property (',' property)*
    ;
    
property
    : identifier EQ propertyValue
    ;

propertyValue
    : DEFAULT
    | expression
    ;
```

**示例：**

```SQL
IoTDB> SET CONFIGURATION disk_space_warning_threshold='0.05',heartbeat_interval_in_ms='1000' ON 1;
```

### 2.3 读取手动修改的配置文件

**语法：**

```SQL
loadConfigurationStatement
    : LOAD CONFIGURATION localOrClusterMode?
    ;
    
localOrClusterMode
    : (ON (LOCAL | CLUSTER))
    ;
```

**示例：**

```SQL
IoTDB> LOAD CONFIGURATION ON LOCAL;
```

### 2.4 设置系统的状态

**语法：**

```SQL
setSystemStatusStatement
    : SET SYSTEM TO (READONLY | RUNNING) localOrClusterMode?
    ;    
    
localOrClusterMode
    : (ON (LOCAL | CLUSTER))
    ;
```

**示例：**

```SQL
IoTDB> SET SYSTEM TO READONLY ON CLUSTER;
```

## 3. 数据管理

### 3.1 将内存表中的数据刷到磁盘

**语法：**

```SQL
flushStatement
    : FLUSH identifier? (',' identifier)* booleanValue? localOrClusterMode?
    ;

booleanValue
    : TRUE | FALSE
    ;

localOrClusterMode
    : (ON (LOCAL | CLUSTER))
    ;
```

**示例：**

```SQL
IoTDB> FLUSH test_db TRUE ON LOCAL;
```


## 4. 数据修复

### 4.1 启动后台扫描并修复 tsfile 任务

**语法：**

```SQL
startRepairDataStatement
    : START REPAIR DATA localOrClusterMode?
    ;
    
localOrClusterMode
    : (ON (LOCAL | CLUSTER))
    ;
```

**示例：**

```SQL
IoTDB> START REPAIR DATA ON CLUSTER;
```

### 4.2 暂停后台修复 tsfile 任务

**语法：**

```SQL
stopRepairDataStatement
    : STOP REPAIR DATA localOrClusterMode?
    ;
    
localOrClusterMode
    : (ON (LOCAL | CLUSTER))
    ;
```

**示例：**

```SQL
IoTDB> STOP REPAIR DATA ON CLUSTER;
```

## 5. 查询相关

### 5.1 查看正在执行的查询

**语法：**

```SQL
showQueriesStatement
    : SHOW (QUERIES | QUERY PROCESSLIST)
        (WHERE where=booleanExpression)?
        (ORDER BY sortItem (',' sortItem)*)?
        limitOffsetClause
    ;
```

**示例：**

```SQL
IoTDB> SHOW QUERIES WHERE elapsed_time > 30 
+-----------------------+-----------------------------+-----------+------------+------------+----+
|               query_id|                   start_time|datanode_id|elapsed_time|   statement|user|
+-----------------------+-----------------------------+-----------+------------+------------+----+
|20250108_101015_00000_1|2025-01-08T18:10:15.935+08:00|          1|      32.283|show queries|root|
+-----------------------+-----------------------------+-----------+------------+------------+----+
```

### 5.2 主动终止查询

**语法：**

```SQL
killQueryStatement
    : KILL (QUERY queryId=string | ALL QUERIES)
    ;
```

**示例：**

```SQL
IoTDB> KILL QUERY 20250108_101015_00000_1; -- 终止指定query
IoTDB> KILL ALL QUERIES; -- 终止所有query
```

### 5.3 查询性能分析

#### 5.3.1 查看执行计划

**语法：**

```SQL
EXPLAIN <SELECT_STATEMENT>
```

更多详细语法说明请参考：[EXPLAIN 语句](../User-Manual/Query-Performance-Analysis.md#_1-explain-语句)

**示例：**

```SQL
IoTDB> explain select * from t1
+-----------------------------------------------------------------------------------------------+
|                                                                              distribution plan|
+-----------------------------------------------------------------------------------------------+
|                        ┌─────────────────────────────────────────────┐                        |
|                        │OutputNode-4                                 │                        |
|                        │OutputColumns-[time, device_id, type, speed] │                        |
|                        │OutputSymbols: [time, device_id, type, speed]│                        |
|                        └─────────────────────────────────────────────┘                        |
|                                               │                                               |
|                                               │                                               |
|                        ┌─────────────────────────────────────────────┐                        |
|                        │Collect-21                                   │                        |
|                        │OutputSymbols: [time, device_id, type, speed]│                        |
|                        └─────────────────────────────────────────────┘                        |
|                       ┌───────────────────────┴───────────────────────┐                       |
|                       │                                               │                       |
|┌─────────────────────────────────────────────┐                  ┌───────────┐                 |
|│TableScan-19                                 │                  │Exchange-28│                 |
|│QualifiedTableName: test.t1                  │                  └───────────┘                 |
|│OutputSymbols: [time, device_id, type, speed]│                        │                       |
|│DeviceNumber: 1                              │                        │                       |
|│ScanOrder: ASC                               │ ┌─────────────────────────────────────────────┐|
|│PushDownOffset: 0                            │ │TableScan-20                                 │|
|│PushDownLimit: 0                             │ │QualifiedTableName: test.t1                  │|
|│PushDownLimitToEachDevice: false             │ │OutputSymbols: [time, device_id, type, speed]│|
|│RegionId: 2                                  │ │DeviceNumber: 1                              │|
|└─────────────────────────────────────────────┘ │ScanOrder: ASC                               │|
|                                                │PushDownOffset: 0                            │|
|                                                │PushDownLimit: 0                             │|
|                                                │PushDownLimitToEachDevice: false             │|
|                                                │RegionId: 1                                  │|
|                                                └─────────────────────────────────────────────┘|
+-----------------------------------------------------------------------------------------------+
```

#### 5.3.2 查询性能分析

**语法：**

```SQL
EXPLAIN ANALYZE [VERBOSE] <SELECT_STATEMENT>
```

更多详细语法说明请参考：[EXPLAIN ANALYZE 语句](../User-Manual/Query-Performance-Analysis.md#_2-explain-analyze-语句)

**示例：**

```SQL
IoTDB> explain analyze verbose select * from t1
+-----------------------------------------------------------------------------------------------+
|                                                                                Explain Analyze|
+-----------------------------------------------------------------------------------------------+
|Analyze Cost: 38.860 ms                                                                        |
|Fetch Partition Cost: 9.888 ms                                                                 |
|Fetch Schema Cost: 54.046 ms                                                                   |
|Logical Plan Cost: 10.102 ms                                                                   |
|Logical Optimization Cost: 17.396 ms                                                           |
|Distribution Plan Cost: 2.508 ms                                                               |
|Dispatch Cost: 22.126 ms                                                                       |
|Fragment Instances Count: 2                                                                    |
|                                                                                               |
|FRAGMENT-INSTANCE[Id: 20241127_090849_00009_1.2.0][IP: 0.0.0.0][DataRegion: 2][State: FINISHED]|
|  Total Wall Time: 18 ms                                                                       |
|  Cost of initDataQuerySource: 6.153 ms                                                        |
|  Seq File(unclosed): 1, Seq File(closed): 0                                                   |
|  UnSeq File(unclosed): 0, UnSeq File(closed): 0                                               |
|  ready queued time: 0.164 ms, blocked queued time: 0.342 ms                                   |
|  Query Statistics:                                                                            |
|    loadBloomFilterFromCacheCount: 0                                                           |
|    loadBloomFilterFromDiskCount: 0                                                            |
|    loadBloomFilterActualIOSize: 0                                                             |
|    loadBloomFilterTime: 0.000                                                                 |
|    loadTimeSeriesMetadataAlignedMemSeqCount: 1                                                |
|    loadTimeSeriesMetadataAlignedMemSeqTime: 0.246                                             |
|    loadTimeSeriesMetadataFromCacheCount: 0                                                    |
|    loadTimeSeriesMetadataFromDiskCount: 0                                                     |
|    loadTimeSeriesMetadataActualIOSize: 0                                                      |
|    constructAlignedChunkReadersMemCount: 1                                                    |
|    constructAlignedChunkReadersMemTime: 0.294                                                 |
|    loadChunkFromCacheCount: 0                                                                 |
|    loadChunkFromDiskCount: 0                                                                  |
|    loadChunkActualIOSize: 0                                                                   |
|    pageReadersDecodeAlignedMemCount: 1                                                        |
|    pageReadersDecodeAlignedMemTime: 0.047                                                     |
|    [PlanNodeId 43]: IdentitySinkNode(IdentitySinkOperator)                                    |
|        CPU Time: 5.523 ms                                                                     |
|        output: 2 rows                                                                         |
|        HasNext() Called Count: 6                                                              |
|        Next() Called Count: 5                                                                 |
|        Estimated Memory Size: : 327680                                                        |
|      [PlanNodeId 31]: CollectNode(CollectOperator)                                            |
|          CPU Time: 5.512 ms                                                                   |
|          output: 2 rows                                                                       |
|          HasNext() Called Count: 6                                                            |
|          Next() Called Count: 5                                                               |
|          Estimated Memory Size: : 327680                                                      |
|        [PlanNodeId 29]: TableScanNode(TableScanOperator)                                      |
|            CPU Time: 5.439 ms                                                                 |
|            output: 1 rows                                                                     |
|            HasNext() Called Count: 3
|            Next() Called Count: 2                                                             |
|            Estimated Memory Size: : 327680                                                    |
|            DeviceNumber: 1                                                                    |
|            CurrentDeviceIndex: 0                                                              |
|        [PlanNodeId 40]: ExchangeNode(ExchangeOperator)                                        |
|            CPU Time: 0.053 ms                                                                 |
|            output: 1 rows                                                                     |
|            HasNext() Called Count: 2                                                          |
|            Next() Called Count: 1                                                             |
|            Estimated Memory Size: : 131072                                                    |
|                                                                                               |
|FRAGMENT-INSTANCE[Id: 20241127_090849_00009_1.3.0][IP: 0.0.0.0][DataRegion: 1][State: FINISHED]|
|  Total Wall Time: 13 ms                                                                       |
|  Cost of initDataQuerySource: 5.725 ms                                                        |
|  Seq File(unclosed): 1, Seq File(closed): 0                                                   |
|  UnSeq File(unclosed): 0, UnSeq File(closed): 0                                               |
|  ready queued time: 0.118 ms, blocked queued time: 5.844 ms                                   |
|  Query Statistics:                                                                            |
|    loadBloomFilterFromCacheCount: 0                                                           |
|    loadBloomFilterFromDiskCount: 0                                                            |
|    loadBloomFilterActualIOSize: 0                                                             |
|    loadBloomFilterTime: 0.000                                                                 |
|    loadTimeSeriesMetadataAlignedMemSeqCount: 1                                                |
|    loadTimeSeriesMetadataAlignedMemSeqTime: 0.004                                             |
|    loadTimeSeriesMetadataFromCacheCount: 0                                                    |
|    loadTimeSeriesMetadataFromDiskCount: 0                                                     |
|    loadTimeSeriesMetadataActualIOSize: 0                                                      |
|    constructAlignedChunkReadersMemCount: 1                                                    |
|    constructAlignedChunkReadersMemTime: 0.001                                                 |
|    loadChunkFromCacheCount: 0                                                                 |
|    loadChunkFromDiskCount: 0                                                                  |
|    loadChunkActualIOSize: 0                                                                   |
|    pageReadersDecodeAlignedMemCount: 1                                                        |
|    pageReadersDecodeAlignedMemTime: 0.007                                                     |
|    [PlanNodeId 42]: IdentitySinkNode(IdentitySinkOperator)                                    |
|        CPU Time: 0.270 ms                                                                     |
|        output: 1 rows                                                                         |
|        HasNext() Called Count: 3                                                              |
|        Next() Called Count: 2                                                                 |
|        Estimated Memory Size: : 327680                                                        |
|      [PlanNodeId 30]: TableScanNode(TableScanOperator)                                        |
|          CPU Time: 0.250 ms                                                                   |
|          output: 1 rows                                                                       |
|          HasNext() Called Count: 3                                                            |
|          Next() Called Count: 2                                                               |
|          Estimated Memory Size: : 327680                                                      |
|          DeviceNumber: 1                                                                      |
|          CurrentDeviceIndex: 0                                                                |
+-----------------------------------------------------------------------------------------------+
```