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add table_disk_usage from 2091
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Lines changed: 1018 additions & 16 deletions

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

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@@ -59,6 +59,7 @@ IoTDB> show tables from information_schema
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| regions| INF|
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| services| INF|
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| subscriptions| INF|
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| table_disk_usage| INF|
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| tables| INF|
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| topics| INF|
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| views| INF|
@@ -67,7 +68,7 @@ IoTDB> show tables from information_schema
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## 2. System Tables
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* ​**Names**​: `DATABASES`, `TABLES`, `REGIONS`, `QUERIES`, `COLUMNS`, `PIPES`, `PIPE_PLUGINS`, `SUBSCRIPTION`, `TOPICS`, `VIEWS`, `MODELS`, `FUNCTIONS`, `CONFIGURATIONS`, `KEYWORDS`, `NODES`, `CONFIG_NODES`, `DATA_NODES` , `CONNECTIONS`, `CURRENT_QUERIES`, `QUERIES_COSTS_HISTOGRAM`, `SERVICES` (detailed descriptions in later sections)
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* ​**Names**​: `DATABASES`, `TABLES`, `REGIONS`, `QUERIES`, `COLUMNS`, `PIPES`, `PIPE_PLUGINS`, `SUBSCRIPTION`, `TOPICS`, `VIEWS`, `MODELS`, `FUNCTIONS`, `CONFIGURATIONS`, `KEYWORDS`, `NODES`, `CONFIG_NODES`, `DATA_NODES` , `CONNECTIONS`, `CURRENT_QUERIES`, `QUERIES_COSTS_HISTOGRAM`, `SERVICES`, `TABLE_DISK_USAGE` (detailed descriptions in later sections)
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* ​**Operations**​: Read-only, only supports `SELECT`, `COUNT/SHOW DEVICES`, `DESC`. Any modifications to table structure or content are not allowed and will result in an error: `"The database 'information_schema' can only be queried." `
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* ​**Column Names**​: System table column names are all lowercase by default and separated by underscores (`_`).
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@@ -713,6 +714,81 @@ IoTDB> SELECT * FROM information_schema.services
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+------------+-----------+---------+
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```
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##### 2.22 TABLE_DISK_USAGE
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> This system table is available since version V2.0.9-beta
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Used to display the disk space usage of specified tables (excluding views), including the size of ChunkGroups and the size of Metadata.
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Note: Statistics are based on the actual size of data in TsFiles; therefore, deletions made via mods are not considered.
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The table structure is shown below:
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| Column Name | Data Type | Column Type | Description |
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|-----------------|-----------|-------------|----------------------------------|
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| database | string | Field | Database name |
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| table_name | string | Field | Table name |
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| datanode_id | int32 | Field | DataNode node ID |
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| region_id | int32 | Field | Region ID |
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| time_partition | int64 | Field | Time partition ID |
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| size_in_bytes | int64 | Field | Disk space occupied (in bytes) |
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**Query Examples**:
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```SQL
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-- Query all data;
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select * from information_schema.table_disk_usage;
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```
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```Bash
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+---------+-------------------+-----------+---------+--------------+-------------+
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| database| table_name|datanode_id|region_id|time_partition|size_in_bytes|
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+---------+-------------------+-----------+---------+--------------+-------------+
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|database1| table1| 1| 3| 2864| 867|
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|database1| table11| 1| 3| 2864| 0|
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|database1| table3| 1| 3| 2864| 0|
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|database1| table1| 1| 3| 2865| 1411|
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|database1| table11| 1| 3| 2865| 0|
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|database1| table3| 1| 3| 2865| 0|
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|database1| table1| 1| 3| 2925| 590|
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|database1| table11| 1| 3| 2925| 0|
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|database1| table3| 1| 3| 2925| 0|
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|database1| table1| 1| 4| 2864| 883|
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|database1| table11| 1| 4| 2864| 0|
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|database1| table3| 1| 4| 2864| 0|
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|database1| table1| 1| 4| 2865| 1224|
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|database1| table11| 1| 4| 2865| 0|
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|database1| table3| 1| 4| 2865| 0|
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|database1| table1| 1| 4| 2888| 0|
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|database1| table11| 1| 4| 2888| 0|
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|database1| table3| 1| 4| 2888| 205|
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| etth| tab_cov_forecast| 1| 8| 0| 0|
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| etth| tab_real| 1| 8| 0| 963|
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| etth|tab_target_forecast| 1| 8| 0| 0|
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| etth| tab_cov_forecast| 1| 9| 0| 448|
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| etth| tab_real| 1| 9| 0| 0|
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| etth|tab_target_forecast| 1| 9| 0| 0|
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+---------+-------------------+-----------+---------+--------------+-------------+
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```
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```SQL
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-- Specify query conditions;
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select * from information_schema.table_disk_usage where region_id = 4 and table_name like '%1';
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```
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```Bash
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+---------+----------+-----------+---------+--------------+-------------+
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| database|table_name|datanode_id|region_id|time_partition|size_in_bytes|
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+---------+----------+-----------+---------+--------------+-------------+
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|database1| table1| 1| 4| 2864| 883|
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|database1| table11| 1| 4| 2864| 0|
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|database1| table1| 1| 4| 2865| 1224|
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|database1| table11| 1| 4| 2865| 0|
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|database1| table1| 1| 4| 2888| 0|
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|database1| table11| 1| 4| 2888| 0|
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+---------+----------+-----------+---------+--------------+-------------+
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```
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## 3. Permission Description
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* GRANT/REVOKE operations are not supported for the `information_schema` database or any of its tables.

‎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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> 💡 **[V2.0.8.2 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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> 💡 **[V2.0.9 Version Update]**<br>
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> 👉 Added onw system tables: **[TABLE_DISK_USAGE](#_2-22-table-disk-usage)** (Table-level Storage Space Statistics), enhancing cluster maintenance and performance analysis.
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## 1. System Database
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| regions| INF|
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| services| INF|
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| subscriptions| INF|
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| table_disk_usage| INF|
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| tables| INF|
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| topics| INF|
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| views| INF|
@@ -71,7 +72,7 @@ IoTDB> show tables from information_schema
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## 2. System Tables
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* ​**Names**​: `DATABASES`, `TABLES`, `REGIONS`, `QUERIES`, `COLUMNS`, `PIPES`, `PIPE_PLUGINS`, `SUBSCRIPTION`, `TOPICS`, `VIEWS`, `MODELS`, `FUNCTIONS`, `CONFIGURATIONS`, `KEYWORDS`, `NODES`, `CONFIG_NODES`, `DATA_NODES`, `CONNECTIONS`, `CURRENT_QUERIES`, `QUERIES_COSTS_HISTOGRAM`, `SERVICES` (detailed descriptions in later sections)
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* ​**Names**​: `DATABASES`, `TABLES`, `REGIONS`, `QUERIES`, `COLUMNS`, `PIPES`, `PIPE_PLUGINS`, `SUBSCRIPTION`, `TOPICS`, `VIEWS`, `MODELS`, `FUNCTIONS`, `CONFIGURATIONS`, `KEYWORDS`, `NODES`, `CONFIG_NODES`, `DATA_NODES`, `CONNECTIONS`, `CURRENT_QUERIES`, `QUERIES_COSTS_HISTOGRAM`, `SERVICES`, `TABLE_DISK_USAGE` (detailed descriptions in later sections)
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* ​**Operations**​: Read-only, only supports `SELECT`, `COUNT/SHOW DEVICES`, `DESC`. Any modifications to table structure or content are not allowed and will result in an error: `"The database 'information_schema' can only be queried." `
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* ​**Column Names**​: System table column names are all lowercase by default and separated by underscores (`_`).
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@@ -717,6 +718,80 @@ IoTDB> SELECT * FROM information_schema.services
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+------------+-----------+---------+
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```
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##### 2.22 TABLE_DISK_USAGE
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> This system table is available since version V2.0.9
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Used to display the disk space usage of specified tables (excluding views), including the size of ChunkGroups and the size of Metadata.
725+
726+
Note: Statistics are based on the actual size of data in TsFiles; therefore, deletions made via mods are not considered.
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The table structure is shown below:
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| Column Name | Data Type | Column Type | Description |
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|-----------------|-----------|-------------|----------------------------------|
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| database | string | Field | Database name |
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| table_name | string | Field | Table name |
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| datanode_id | int32 | Field | DataNode node ID |
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| region_id | int32 | Field | Region ID |
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| time_partition | int64 | Field | Time partition ID |
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| size_in_bytes | int64 | Field | Disk space occupied (in bytes) |
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**Query Examples**:
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```SQL
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-- Query all data;
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select * from information_schema.table_disk_usage;
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```
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```Bash
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+---------+-------------------+-----------+---------+--------------+-------------+
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| database| table_name|datanode_id|region_id|time_partition|size_in_bytes|
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+---------+-------------------+-----------+---------+--------------+-------------+
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|database1| table1| 1| 3| 2864| 867|
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|database1| table11| 1| 3| 2864| 0|
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|database1| table3| 1| 3| 2864| 0|
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|database1| table1| 1| 3| 2865| 1411|
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|database1| table11| 1| 3| 2865| 0|
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|database1| table3| 1| 3| 2865| 0|
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|database1| table1| 1| 3| 2925| 590|
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|database1| table11| 1| 3| 2925| 0|
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|database1| table3| 1| 3| 2925| 0|
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|database1| table1| 1| 4| 2864| 883|
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|database1| table11| 1| 4| 2864| 0|
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|database1| table3| 1| 4| 2864| 0|
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|database1| table1| 1| 4| 2865| 1224|
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|database1| table11| 1| 4| 2865| 0|
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|database1| table3| 1| 4| 2865| 0|
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|database1| table1| 1| 4| 2888| 0|
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|database1| table11| 1| 4| 2888| 0|
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|database1| table3| 1| 4| 2888| 205|
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| etth| tab_cov_forecast| 1| 8| 0| 0|
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| etth| tab_real| 1| 8| 0| 963|
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| etth|tab_target_forecast| 1| 8| 0| 0|
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| etth| tab_cov_forecast| 1| 9| 0| 448|
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| etth| tab_real| 1| 9| 0| 0|
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| etth|tab_target_forecast| 1| 9| 0| 0|
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+---------+-------------------+-----------+---------+--------------+-------------+
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```
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```SQL
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-- Specify query conditions;
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select * from information_schema.table_disk_usage where region_id = 4 and table_name like '%1';
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```
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```Bash
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+---------+----------+-----------+---------+--------------+-------------+
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| database|table_name|datanode_id|region_id|time_partition|size_in_bytes|
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+---------+----------+-----------+---------+--------------+-------------+
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|database1| table1| 1| 4| 2864| 883|
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|database1| table11| 1| 4| 2864| 0|
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|database1| table1| 1| 4| 2865| 1224|
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|database1| table11| 1| 4| 2865| 0|
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|database1| table1| 1| 4| 2888| 0|
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|database1| table11| 1| 4| 2888| 0|
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+---------+----------+-----------+---------+--------------+-------------+
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```
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## 3. Permission Description
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‎src/UserGuide/Master/Tree/User-Manual/Maintenance-commands_apache.md‎

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@@ -302,6 +302,51 @@ Execution result:
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+--------------+-------------+---------+
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```
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### 1.9 View Disk Space Usage
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**Description**: Returns the disk space usage of the specified `pattern`, including the size of ChunkGroups and the size of Metadata.
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**Note**: Statistics are based on the actual size of data in TsFiles; therefore, deletions made via `mods` are not considered.
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> Supported since version 2.0.9-beta
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#### Syntax:
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```sql
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showDiskUsageStatement
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: SHOW DISK_USAGE FROM pathPattern
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whereClause?
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orderByClause?
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rowPaginationClause?
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;
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pathPattern
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: ROOT (DOT nodeName)*
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;
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```
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**Explanation**: The `pattern` is used to match devices, must start with `ROOT`, and intermediate nodes in the path support `*` or `**`.
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#### Result Set
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| Column Name | Column Type | Description |
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|---------------|-------------|----------------------------------|
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| Database | string | Database name |
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| DataNodeId | int32 | DataNode node ID |
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| RegionId | int32 | Region ID |
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| TimePartition | int64 | Time partition ID |
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| SizeInBytes | int64 | Disk space occupied (in bytes) |
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#### Example:
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```sql
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SHOW DISK_USAGE FROM root.ln.**;
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```
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**Execution Result**:
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```bash
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+--------+----------+--------+-------------+-----------+
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|Database|DataNodeId|RegionId|TimePartition|SizeInBytes|
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+--------+----------+--------+-------------+-----------+
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| root.ln| 1| 13| 2932| 203|
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+--------+----------+--------+-------------+-----------+
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```
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## 2. Status Setting
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‎src/UserGuide/Master/Tree/User-Manual/Maintenance-commands_timecho.md‎

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+--------------+-------------+---------+
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```
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### 1.9 View Disk Space Usage
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**Description**: Returns the disk space usage of the specified `pattern`, including the size of ChunkGroups and the size of Metadata.
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**Note**: Statistics are based on the actual size of data in TsFiles; therefore, deletions made via `mods` are not considered.
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> Supported since version 2.0.9
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#### Syntax:
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```sql
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showDiskUsageStatement
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: SHOW DISK_USAGE FROM pathPattern
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whereClause?
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orderByClause?
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rowPaginationClause?
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;
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pathPattern
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: ROOT (DOT nodeName)*
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;
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```
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**Explanation**: The `pattern` is used to match devices, must start with `ROOT`, and intermediate nodes in the path support `*` or `**`.
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#### Result Set
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| Column Name | Column Type | Description |
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|---------------|-------------|----------------------------------|
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| Database | string | Database name |
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| DataNodeId | int32 | DataNode node ID |
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| RegionId | int32 | Region ID |
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| TimePartition | int64 | Time partition ID |
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| SizeInBytes | int64 | Disk space occupied (in bytes) |
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#### Example:
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```sql
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SHOW DISK_USAGE FROM root.ln.**;
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```
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**Execution Result**:
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```bash
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+--------+----------+--------+-------------+-----------+
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|Database|DataNodeId|RegionId|TimePartition|SizeInBytes|
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+--------+----------+--------+-------------+-----------+
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| root.ln| 1| 13| 2932| 203|
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+--------+----------+--------+-------------+-----------+
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```
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## 2. Status Setting
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