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TDengine
TDengine
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docs/en/12-taos-sql/22-meta.md
浏览文件 @ 9667e5df
......@@ -29,7 +29,7 @@ This document introduces the tables of INFORMATION_SCHEMA and their structure.
Provides information about dnodes. Similar to SHOW DNODES.
| # | **Column** | **Data Type** | **Description** |
| --- | :------------: | ------------ | ------------------------- |
| --- | :------------: | ------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1 | vnodes | SMALLINT | Current number of vnodes on the dnode. It should be noted that `vnodes` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
| 2 | support_vnodes | SMALLINT | Maximum number of vnodes on the dnode |
| 3 | status | BINARY(10) | Current status |
......@@ -43,7 +43,7 @@ Provides information about dnodes. Similar to SHOW DNODES.
Provides information about mnodes. Similar to SHOW MNODES.
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------ | ------------------ |
| --- | :---------: | ------------- | ------------------------------------------ |
| 1 | id | SMALLINT | Mnode ID |
| 2 | endpoint | BINARY(134) | Mnode endpoint |
| 3 | role | BINARY(10) | Current role |
......@@ -55,7 +55,7 @@ Provides information about mnodes. Similar to SHOW MNODES.
Provides information about qnodes. Similar to SHOW QNODES.
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------ | ------------ |
| --- | :---------: | ------------- | --------------- |
| 1 | id | SMALLINT | Qnode ID |
| 2 | endpoint | BINARY(134) | Qnode endpoint |
| 3 | create_time | TIMESTAMP | Creation time |
......@@ -65,7 +65,7 @@ Provides information about qnodes. Similar to SHOW QNODES.
Provides information about the cluster.
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------ | ---------- |
| --- | :---------: | ------------- | --------------- |
| 1 | id | BIGINT | Cluster ID |
| 2 | name | BINARY(134) | Cluster name |
| 3 | create_time | TIMESTAMP | Creation time |
......@@ -75,8 +75,8 @@ Provides information about the cluster.
Provides information about user-created databases. Similar to SHOW DATABASES.
| # | **Column** | **Data Type** | **Description** |
| --- | :------------------: | ---------------- | ------------------------------------------------ |
| 1| name| BINARY(32)| Database name |
| --- | :------------------: | ------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1 | name | BINARY(32) | Database name |
| 2 | create_time | TIMESTAMP | Creation time |
| 3 | ntables | INT | Number of standard tables and subtables (not including supertables) |
| 4 | vgroups | INT | Number of vgroups. It should be noted that `vnodes` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
......@@ -112,7 +112,7 @@ Provides information about user-created databases. Similar to SHOW DATABASES.
Provides information about user-defined functions.
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------ | -------------- |
| --- | :-----------: | ------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1 | name | BINARY(64) | Function name |
| 2 | comment | BINARY(255) | Function description. It should be noted that `comment` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
| 3 | aggregate | INT | Whether the UDF is an aggregate function. It should be noted that `aggregate` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
......@@ -122,27 +122,27 @@ Provides information about user-defined functions.
| 7 | bufsize | INT | Buffer size |
| 8 | func_language | BINARY(31) | UDF programming language |
| 9 | func_body | BINARY(16384) | UDF function body |
| 10 | func_version | INT | UDF function version. starting from 0. Increasing by 1 each time it is updated|
| 10 | func_version | INT | UDF function version. starting from 0. Increasing by 1 each time it is updated |
## INS_INDEXES
Provides information about user-created indices. Similar to SHOW INDEX.
| # | **Column** | **Data Type** | **Description** |
| --- | :--------------: | ------------ | ---------------------------------------------------------------------------------- |
| --- | :--------------: | ------------- | --------------------------------------------------------------------- |
| 1 | db_name | BINARY(32) | Database containing the table with the specified index |
| 2 | table_name | BINARY(192) | Table containing the specified index |
| 3 | index_name | BINARY(192) | Index name |
| 4 | db_name | BINARY(64) | Index column |
| 5 | index_type | BINARY(10) | SMA or FULLTEXT index |
| 6 | index_extensions | BINARY(256) | Other information For SMA indices, this shows a list of functions. For FULLTEXT indices, this is null. |
| 5 | index_type | BINARY(10) | SMA or tag index |
| 6 | index_extensions | BINARY(256) | Other information For SMA/tag indices, this shows a list of functions |
## INS_STABLES
Provides information about supertables.
| # | **Column** | **Data Type** | **Description** |
| --- | :-----------: | ------------ | ------------------------ |
| --- | :-----------: | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1 | stable_name | BINARY(192) | Supertable name |
| 2 | db_name | BINARY(64) | All databases in the supertable |
| 3 | create_time | TIMESTAMP | Creation time |
......@@ -159,7 +159,7 @@ Provides information about supertables.
Provides information about standard tables and subtables.
| # | **Column** | **Data Type** | **Description** |
| --- | :-----------: | ------------ | ---------------- |
| --- | :-----------: | ------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
| 1 | table_name | BINARY(192) | Table name |
| 2 | db_name | BINARY(64) | Database name |
| 3 | create_time | TIMESTAMP | Creation time |
......@@ -174,7 +174,7 @@ Provides information about standard tables and subtables.
## INS_TAGS
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------- | ---------------------- |
| --- | :---------: | ------------- | --------------- |
| 1 | table_name | BINARY(192) | Table name |
| 2 | db_name | BINARY(64) | Database name |
| 3 | stable_name | BINARY(192) | Supertable name |
......@@ -185,7 +185,7 @@ Provides information about standard tables and subtables.
## INS_COLUMNS
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------- | ---------------------- |
| --- | :-----------: | ------------- | ---------------- |
| 1 | table_name | BINARY(192) | Table name |
| 2 | db_name | BINARY(64) | Database name |
| 3 | table_type | BINARY(21) | Table type |
......@@ -201,7 +201,7 @@ Provides information about standard tables and subtables.
Provides information about TDengine users.
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------ | -------- |
| --- | :---------: | ------------- | ---------------- |
| 1 | user_name | BINARY(23) | User name |
| 2 | privilege | BINARY(256) | User permissions |
| 3 | create_time | TIMESTAMP | Creation time |
......@@ -211,7 +211,7 @@ Provides information about TDengine users.
Provides information about TDengine Enterprise Edition permissions.
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------ | -------------------------------------------------- |
| --- | :---------: | ------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1 | version | BINARY(9) | Whether the deployment is a licensed or trial version |
| 2 | cpu_cores | BINARY(9) | CPU cores included in license |
| 3 | dnodes | BINARY(10) | Dnodes included in license. It should be noted that `dnodes` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
......@@ -232,7 +232,7 @@ Provides information about TDengine Enterprise Edition permissions.
Provides information about vgroups.
| # | **Column** | **Data Type** | **Description** |
| --- | :-------: | ------------ | ------------------------------------------------------ |
| --- | :--------: | ------------- | ----------------------------------------------------------------------------------------------------------------------------------- |
| 1 | vgroup_id | INT | Vgroup ID |
| 2 | db_name | BINARY(32) | Database name |
| 3 | tables | INT | Tables in vgroup. It should be noted that `tables` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
......@@ -252,7 +252,7 @@ Provides information about vgroups.
Provides system configuration information.
| # | **Column** | **Data Type** | **Description** |
| --- | :------: | ------------ | ------------ |
| --- | :--------: | ------------- | ----------------------------------------------------------------------------------------------------------------------- |
| 1 | name | BINARY(32) | Parameter |
| 2 | value | BINARY(64) | Value. It should be noted that `value` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
......@@ -261,7 +261,7 @@ Provides system configuration information.
Provides dnode configuration information.
| # | **Column** | **Data Type** | **Description** |
| --- | :------: | ------------ | ------------ |
| --- | :--------: | ------------- | ----------------------------------------------------------------------------------------------------------------------- |
| 1 | dnode_id | INT | Dnode ID |
| 2 | name | BINARY(32) | Parameter |
| 3 | value | BINARY(64) | Value. It should be noted that `value` is a TDengine keyword and needs to be escaped with ` when used as a column name. |
......@@ -269,7 +269,7 @@ Provides dnode configuration information.
## INS_TOPICS
| # | **Column** | **Data Type** | **Description** |
| --- | :---------: | ------------ | ------------------------------ |
| --- | :---------: | ------------- | -------------------------------------- |
| 1 | topic_name | BINARY(192) | Topic name |
| 2 | db_name | BINARY(64) | Database for the topic |
| 3 | create_time | TIMESTAMP | Creation time |
......@@ -278,7 +278,7 @@ Provides dnode configuration information.
## INS_SUBSCRIPTIONS
| # | **Column** | **Data Type** | **Description** |
| --- | :------------: | ------------ | ------------------------ |
| --- | :------------: | ------------- | --------------------------- |
| 1 | topic_name | BINARY(204) | Subscribed topic |
| 2 | consumer_group | BINARY(193) | Subscribed consumer group |
| 3 | vgroup_id | INT | Vgroup ID for the consumer |
......@@ -289,7 +289,7 @@ Provides dnode configuration information.
## INS_STREAMS
| # | **Column** | **Data Type** | **Description** |
| --- | :----------: | ------------ | --------------------------------------- |
| --- | :----------: | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1 | stream_name | BINARY(64) | Stream name |
| 2 | create_time | TIMESTAMP | Creation time |
| 3 | sql | BINARY(1024) | SQL statement used to create the stream |
......
docs/en/12-taos-sql/27-index.md
浏览文件 @ 9667e5df
......@@ -4,12 +4,12 @@ sidebar_label: Indexing
description: This document describes the SQL statements related to indexing in TDengine.
---
TDengine supports SMA and FULLTEXT indexing.
TDengine supports SMA and tag indexing.
## Create an Index
```sql
CREATE FULLTEXT INDEX index_name ON tb_name (col_name [, col_name] ...)
CREATE INDEX index_name ON tb_name (col_name [, col_name] ...)
CREATE SMA INDEX index_name ON tb_name index_option
......@@ -46,10 +46,6 @@ SELECT _wstart,_wend,_wduration,max(c2),min(c1) FROM st1 INTERVAL(5m,10s) SLIDIN
ALTER LOCAL 'querySmaOptimize' '0';
```
### FULLTEXT Indexing
Creates a text index for the specified column. FULLTEXT indexing improves performance for queries with text filtering. The index_option syntax is not supported for FULLTEXT indexing. FULLTEXT indexing is supported for JSON tag columns only. Multiple columns cannot be indexed together. However, separate indices can be created for each column.
## Delete an Index
```sql
......
docs/zh/12-taos-sql/22-meta.md
浏览文件 @ 9667e5df
......@@ -29,7 +29,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
提供 dnode 的相关信息。也可以使用 SHOW DNODES 来查询这些信息。
| # | **列名** | **数据类型** | **说明** |
| --- | :------------: | ------------ | ------------------------- |
| --- | :------------: | ------------ | ----------------------------------------------------------------------------------------------------- |
| 1 | vnodes | SMALLINT | dnode 中的实际 vnode 个数。需要注意，`vnodes` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
| 2 | support_vnodes | SMALLINT | 最多支持的 vnode 个数 |
| 3 | status | BINARY(10) | 当前状态 |
......@@ -75,7 +75,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
提供用户创建的数据库对象的相关信息。也可以使用 SHOW DATABASES 来查询这些信息。
| # | **列名** | **数据类型** | **说明** |
| --- | :------------------: | ---------------- | ------------------------------------------------ |
| --- | :------------------: | ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1 | name | BINARY(32) | 数据库名 |
| 2 | create_time | TIMESTAMP | 创建时间 |
| 3 | ntables | INT | 数据库中表的数量，包含子表和普通表但不包含超级表 |
......@@ -112,7 +112,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
用户创建的自定义函数的信息。
| # | **列名** | **数据类型** | **说明** |
| --- | :---------: | ------------ | -------------- |
| --- | :-----------: | ------------- | --------------------------------------------------------------------------------------------- |
| 1 | name | BINARY(64) | 函数名 |
| 2 | comment | BINARY(255) | 补充说明。需要注意，`comment` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
| 3 | aggregate | INT | 是否为聚合函数。需要注意，`aggregate` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
......@@ -122,7 +122,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
| 7 | bufsize | INT | buffer 大小 |
| 8 | func_language | BINARY(31) | 自定义函数编程语言 |
| 9 | func_body | BINARY(16384) | 函数体定义 |
| 10 | func_version | INT | 函数版本号。初始版本为0，每次替换更新，版本号加1。|
| 10 | func_version | INT | 函数版本号。初始版本为0，每次替换更新，版本号加1。 |
## INS_INDEXES
......@@ -130,20 +130,20 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
提供用户创建的索引的相关信息。也可以使用 SHOW INDEX 来查询这些信息。
| # | **列名** | **数据类型** | **说明** |
| --- | :--------------: | ------------ | ---------------------------------------------------------------------------------- |
| --- | :--------------: | ------------ | ------------------------------------------------------- |
| 1 | db_name | BINARY(32) | 包含此索引的表所在的数据库名 |
| 2 | table_name | BINARY(192) | 包含此索引的表的名称 |
| 3 | index_name | BINARY(192) | 索引名 |
| 4 | column_name | BINARY(64) | 建索引的列的列名 |
| 5 | index_type | BINARY(10) | 目前有 SMA 和 FULLTEXT |
| 6 | index_extensions | BINARY(256) | 索引的额外信息。对 SMA 类型的索引，是函数名的列表。对 FULLTEXT 类型的索引为 NULL。 |
| 5 | index_type | BINARY(10) | 目前有 SMA 和 tag |
| 6 | index_extensions | BINARY(256) | 索引的额外信息。对 SMA/tag 类型的索引，是函数名的列表。 |
## INS_STABLES
提供用户创建的超级表的相关信息。
| # | **列名** | **数据类型** | **说明** |
| --- | :-----------: | ------------ | ------------------------ |
| --- | :-----------: | ------------ | ----------------------------------------------------------------------------------------------------- |
| 1 | stable_name | BINARY(192) | 超级表表名 |
| 2 | db_name | BINARY(64) | 超级表所在的数据库的名称 |
| 3 | create_time | TIMESTAMP | 创建时间 |
......@@ -160,7 +160,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
提供用户创建的普通表和子表的相关信息
| # | **列名** | **数据类型** | **说明** |
| --- | :-----------: | ------------ | ---------------- |
| --- | :-----------: | ------------ | ------------------------------------------------------------------------------------- |
| 1 | table_name | BINARY(192) | 表名 |
| 2 | db_name | BINARY(64) | 数据库名 |
| 3 | create_time | TIMESTAMP | 创建时间 |
......@@ -186,7 +186,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
## INS_COLUMNS
| # | **列名** | **数据类型** | **说明** |
| --- | :---------: | ------------- | ---------------------- |
| --- | :-----------: | ------------ | ---------------------- |
| 1 | table_name | BINARY(192) | 表名 |
| 2 | db_name | BINARY(64) | 该表所在的数据库的名称 |
| 3 | table_type | BINARY(21) | 表类型 |
......@@ -212,7 +212,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
提供企业版授权的相关信息。
| # | **列名** | **数据类型** | **说明** |
| --- | :---------: | ------------ | -------------------------------------------------- |
| --- | :---------: | ------------ | --------------------------------------------------------------------------------------------------------- |
| 1 | version | BINARY(9) | 企业版授权说明：official(官方授权的)/trial(试用的) |
| 2 | cpu_cores | BINARY(9) | 授权使用的 CPU 核心数量 |
| 3 | dnodes | BINARY(10) | 授权使用的 dnode 节点数量。需要注意，`dnodes` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
......@@ -233,7 +233,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
系统中所有 vgroups 的信息。
| # | **列名** | **数据类型** | **说明** |
| --- | :-------: | ------------ | ------------------------------------------------------ |
| --- | :-------: | ------------ | ------------------------------------------------------------------------------------------------ |
| 1 | vgroup_id | INT | vgroup id |
| 2 | db_name | BINARY(32) | 数据库名 |
| 3 | tables | INT | 此 vgroup 内有多少表。需要注意，`tables` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
......@@ -253,7 +253,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
系统配置参数。
| # | **列名** | **数据类型** | **说明** |
| --- | :------: | ------------ | ------------ |
| --- | :------: | ------------ | --------------------------------------------------------------------------------------- |
| 1 | name | BINARY(32) | 配置项名称 |
| 2 | value | BINARY(64) | 该配置项的值。需要注意，`value` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
......@@ -262,7 +262,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
系统中每个 dnode 的配置参数。
| # | **列名** | **数据类型** | **说明** |
| --- | :------: | ------------ | ------------ |
| --- | :------: | ------------ | --------------------------------------------------------------------------------------- |
| 1 | dnode_id | INT | dnode 的 ID |
| 2 | name | BINARY(32) | 配置项名称 |
| 3 | value | BINARY(64) | 该配置项的值。需要注意，`value` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
......@@ -290,7 +290,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
## INS_STREAMS
| # | **列名** | **数据类型** | **说明** |
| --- | :----------: | ------------ | --------------------------------------- |
| --- | :----------: | ------------ | -------------------------------------------------------------------------------------------------------------------- |
| 1 | stream_name | BINARY(64) | 流计算名称 |
| 2 | create_time | TIMESTAMP | 创建时间 |
| 3 | sql | BINARY(1024) | 创建流计算时提供的 SQL 语句 |
......
docs/zh/12-taos-sql/27-index.md
浏览文件 @ 9667e5df
......@@ -4,12 +4,13 @@ title: 索引
description: 索引功能的使用细节
---
TDengine 从 3.0.0.0 版本开始引入了索引功能，支持 SMA 索引和 FULLTEXT 索引。
TDengine 从 3.0.0.0 版本开始引入了索引功能，支持 SMA 索引和 tag 索引。
## 创建索引
```sql
CREATE FULLTEXT INDEX index_name ON tb_name (col_name [, col_name] ...)
CREATE INDEX index_name ON tb_name index_option
CREATE SMA INDEX index_name ON tb_name index_option
......@@ -46,10 +47,6 @@ SELECT _wstart,_wend,_wduration,max(c2),min(c1) FROM st1 INTERVAL(5m,10s) SLIDIN
ALTER LOCAL 'querySmaOptimize' '0';
```
### FULLTEXT 索引
对指定列建立文本索引，可以提升含有文本过滤的查询的性能。FULLTEXT 索引不支持 index_option 语法。现阶段只支持对 JSON 类型的标签列创建 FULLTEXT 索引。不支持多列联合索引，但可以为每个列分布创建 FULLTEXT 索引。
## 删除索引
```sql
......
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