Tenant-level Information Schema - MaxCompute - Alibaba Cloud Documentation Center

Information Schema is the metadata service of MaxCompute. This topic describes the features, limits, precautions, metadata views, and authorization for RAM users of tenant-level Information Schema.

Background information

The Information Schema service of MaxCompute provides information such as project metadata and historical data. Fields and views that are specific to MaxCompute are added to ANSI SQL-92 Information Schema.

Tenant-level Information Schema is an enhancement of Information Schema. If the tenant-level Information Schema service is activated for your Alibaba Cloud account, a project named SYSTEM_CATALOG is automatically created within the Alibaba Cloud account and a built-in schema named INFORMATION_SCHEMA is provided. You can access the read-only views that are provided by the built-in schema to query the metadata and historical data of all projects within your Alibaba Cloud account. The following table describes the metadata views.

View	Description	Timeliness	Delay
CATALOGS	Lists projects.	Quasi-real-time view	Online data is displayed in metadata views with a delay of approximately 3 hours.
CATALOG_PRIVILEGES	Lists the permissions at the project level.
COLUMNS	Displays information about the table fields in a project.
COLUMN_LABEL_GRANTS	Displays the authorization information of a table column label in a project.
COLUMN_LABELS	Displays information about a table column label in a project.
COLUMN_PRIVILEGES	Displays a table column permission in a project.
INSTALLED_PACKAGES	Displays information about an installed package in a project.
PACKAGE_PRIVILEGES	Displays the authorization information of a package.
PACKAGE_OBJECTS	Displays the object information of a package.
PARTITIONS	Displays information about the table partitions in a project.
RESOURCES	Displays resource information in a project.
RESOURCE_PRIVILEGES	Displays the permission information of resources in a project.
ROLES	Displays project-level roles and tenant-level roles.
TABLES	Displays the table information in a project.
TABLE_LABEL_GRANTS	Displays information about label-based access control.
TABLE_LABELS	Displays the label information of tables in a project.
TABLE_PRIVILEGES	Displays the permission information of tables in a project.
UDF_PRIVILEGES	Displays the permission information of user-defined functions (UDFs) in a project.
UDFS	Displays the UDF information in a project.
UDF_RESOURCES	Displays the resource dependencies of UDFs in a project.
USERS	Lists users.
USER_ROLES	Displays the information about the role that the user assumes.
SCHEMAS	Displays the schema information of a project.
TASKS	Displays real-time snapshots of the jobs that are running. This view is used to monitor jobs in real time.		Online data is displayed in metadata views with a delay of a few seconds. This view is in public preview without SLA guarantee and will be available in the future.
TASKS_HISTORY	Displays the history of completed jobs in a project. The history of completed jobs is stored in a partitioned table and the data of the previous 14 days is retained.		Online data is displayed in metadata views with a delay of approximately 3 hours.
TUNNELS_HISTORY	Displays historical data that is uploaded or downloaded in batch mode by using a tunnel. The historical data is stored in a partitioned table and the data of the previous 14 days is retained.

Features

Tenant-level Information Schema provides the following features:

The metadata views of the Information Schema service allow you to browse and retrieve metadata.
The usage information views of the Information Schema service allow you to optimize jobs and plan resources. For example, you can analyze the metrics of a job, such as the resource consumption, running duration, and amount of processed data.
Different views have different validity periods or default retention periods. Data that exceeds the retention period is inaccessible. You can export data from Information Schema to a MaxCompute table to back up the data at a specific interval. This backup applies to historical data that requires a longer storage period.
Note
When you export data, we recommend that you explicitly specify the field names of the view. If you do not explicitly specify the field names of the view, you may fail to back up data by running insert into select * from information_schema.*** after some fields are inserted into a MaxCompute table.

Fees

The fees for Information Schema vary based on the following scenarios:

For projects that use pay-as-you-go computing resources, you are charged based on the SQL statements that you execute to query a view of Information Schema. Range-clustered tables are used in the views of Information Schema to reduce the amount of input query data and improve query performance. If you query the TASKS_HISTORY and TUNNELS_HISTORY views, we recommend that you query the data of the previous day after 6:00:00 every day. To minimize the input data amount of queries and reduce the query cost, we recommend that you do not query data of the current day.
For projects that use subscription computing resources, the compute units (CUs) that you purchased are consumed when you query views of Information Schema.
You do not need to pay storage fees for the views of Information Schema.

Limits

Tenant-level Information Schema has the following limits:

This feature is available. If you activate MaxCompute before August 1, 2023 and do not use MaxCompute, you may not have data when you use MaxCompute. If you want to use tenant-level Information Schema, apply for trial use of new features to upgrade MaxCompute to a version that supports tenant-level Information Schema.
Information Schema provides metadata views of the current user and does not support access to the metadata across metadata centers. Metadata centers are divided by region based on the following rules:
- Regions in the Chinese mainland, including China (Shanghai), China (Hangzhou), China (Beijing), China (Shenzhen), China (Chengdu), and China (Zhangjiakou), are considered a metadata center.
- The China (Hong Kong) region is considered a metadata center.
- Each region outside China is considered a metadata center.
- Alibaba Finance Cloud including the China East 2 Finance region and the China South 1 Finance region is considered a metadata center.
- China North 2 Ali Gov 1 is considered a metadata center.
The built-in SYSTEM_CATALOG project is a read-only project. To query metadata, you must run a job in the project in the related region. For more information about the examples on how to query metadata, see Examples.
You can execute SQL statements to access tables only by using SQL Analysis of MaxCompute, the latest version of the MaxCompute client, DataStudio of DataWorks, or SQL scheduling nodes of DataWorks.

Precautions

When you use tenant-level Information Schema, take note of the following items:

Quasi-real-time views are provided for metadata system tables. For applications that require high metadata timeliness, we recommend that you use an SDK or CLI to obtain the metadata of a specified object.
Metadata and historical job data are stored only in SYSTEM_CATALOG.INFORMATION_SCHEMA. If you want to take snapshots of historical data or obtain a job history of more than 14 days, you can regularly back up the data in SYSTEM_CATALOG. INFORMATION_SCHEMA to a specified project.

Examples

The following examples show how to query metadata.

Example 1: Query the metadata of all tables in the specified project.

-- Query the metadata of all tables in a project for which the tenant can execute SQL statements.
use <project_name>;
set odps.namespace.schema=true;
select * from  SYSTEM_CATALOG.INFORMATION_SCHEMA.tables;

Example 2: Query the historical data of all jobs in the metadata center in which the specified project resides, and add a date field to filter data.

-- Query the historical data of all jobs in a project for which the tenant can execute SQL statements.
use <project_name>;
set odps.namespace.schema=true;
select * from  SYSTEM_CATALOG.INFORMATION_SCHEMA.tasks_history where ds='yyyymmdd' limit 100;

Authorization for RAM users

Views of Information Schema contain all tenant-level user data. By default, Alibaba Cloud accounts can view the data. If a RAM user wants to view the data, the RAM user must be granted the required permissions.

Note

Only an Alibaba Cloud account or a RAM user that is assigned the tenant-level Super_Administrator role or the tenant-level Admin role can grant permissions.

Log on to the MaxCompute console.
In the left-side navigation pane, choose Tenants > Roles. On the Roles page, click Add Role.

In the Add Role dialog box, configure Role Name and Policy Content. Then, click OK.

For example, you can add a role and grant the role the permissions to query all views under SYSTEM_CATALOG.INFORMATION_SCHEMA. The following sample code provides an example of the policy document.

{
    "Statement":[
        {
            "Action":[
                "odps:Describe",
                "odps:Select"
            ],
            "Effect":"Allow",
            "Resource":[
                "acs:odps:*:catalogs/system_catalog/schemas/information_schema/tables/*"
            ]
        },
        {
            "Action":[
                "odps:List"
            ],
            "Effect":"Allow",
            "Resource":[
                "acs:odps:*:catalogs/system_catalog/schemas/information_schema"
            ]
        }
    ],
    "Version":"1"
}

In the left-side navigation pane, choose Tenants > Users. To assign the role that you create to a new user, perform the following operations: On the Users page, click Add Member. In the Add Member dialog box, select a user to which you want to assign the role that you create from the list of RAM users, select the role that you create in the Batch Set Roles field, and then click OK. To assign the role that you create to an existing RAM user, perform the following operations: On the Users page, find the RAM user to which you want to assign the role that you create and click Modify Role in the Actions column. In the Edit Role dialog box, select the role that you create in the Available Roles section and click OK.
Note
For more information about user management, see User planning and management.

CATALOGS

Lists projects.

Field	Data type	Description
catalog_name	STRING	The name of the project.
status	STRING	Valid values: Allowed and Alldenied.
create_time	DATETIME	The time when the project was created.
owner_id	STRING	The ID of the project owner.
owner_name	STRING	The name of the project owner.
settings	STRING	The project property settings.
region	STRING	The region in which the project resides.

CATALOG_PRIVILEGES

Lists the permissions at the project level, such as CreateInstance and ListTable.

Field	Data type	Description
catalog_name	STRING	The name of the project.
user_catalog	STRING	The project to which the authorized account belongs.
user_name	STRING	The name of the account to which permissions are granted.
user_id	STRING	The ID of the account to which the permissions are granted.
grantor	STRING	The account that grants the permissions to a RAM user. This is a reserved field.
privilege_type	STRING	The type of the permission.

COLUMNS

Displays information about the table fields in a project.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
column_name	STRING	The name of the column.
ordinal_position	BIGINT	The serial number of the column.
column_default	STRING	The default value of the column.
is_nullable	BOOLEAN	Specifies whether the NULL value is allowed.
data_type	STRING	The data type of the column, such as STRING and BIGINT.
column_comment	STRING	The comments on the column.
is_partition_key	BOOLEAN	Specifies whether the column is a partition key.

COLUMN_LABEL_GRANTS

Displays the authorization information of a table column label in a project.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
column_name	STRING	The name of the column.
user_catalog	STRING	The name of the project to which the user belongs.
user_name	STRING	The name of the user.
user_id	STRING	The ID of the user.
grantor	STRING	The account that grants the permissions to a RAM user. This is a reserved field.
label_level	STRING	The granted level of the label.
expired	DATETIME	The time when the authorization expires.

COLUMN_LABELS

Displays information about a table column label in a project.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
column_name	STRING	The name of the column.
label_type	STRING	The type of the label.
label_level	STRING	The level of the label.

COLUMN_PRIVILEGES

Displays a table column permission in a project.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
column_name	STRING	The name of the column.
user_catalog	STRING	The name of the project to which the user belongs.
user_name	STRING	The name of the user.
user_id	STRING	The ID of the user.
grantor	STRING	The account that grants the permissions to a RAM user. This is a reserved field.
privilege_type	STRING	The type of the permission.

INSTALLED_PACKAGES

Displays information about an installed package in a project.

Field	Data type	Description
installed_package_catalog	STRING	The name of the project for which the package is installed.
package_catalog	STRING	The project to which the package belongs.
package_name	STRING	The name of the package.
installed_time	STRING	The time when the package was installed.
allowed_label	STRING	The shared label.

PACKAGE_PRIVILEGES

Displays the authorization information of a package.

Field	Data type	Description
package_catalog	STRING	The project to which the package belongs.
package_name	STRING	The name of the package.
user_catalog	STRING	The project to which the authorized user belongs.
user_name	STRING	The name of the user to which the permissions are granted.
user_id	STRING	The ID of the user to which the permissions are granted.
grantor	STRING	The account that grants the permissions to a RAM user. This is a reserved field.
privilege_type	STRING	The type of the permission.

PACKAGE_OBJECTS

Displays the object information of a package.

Field	Data type	Description
package_catalog	STRING	The project to which the package belongs.
package_name	STRING	The name of the package.
object_schema	STRING	The schema to which the object in the package belongs. The current value is NULL.
object_type	STRING	The type of the object in the package.
object_name	STRING	The name of the object in the package.
column_name	STRING	The name of the table column. You must set object_type to table in advance.
allowed_privilege	STRING	The shared permission.
allowed_label	STRING	The shared label.

PARTITIONS

Displays information about the table partitions in a project.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
partition_name	STRING	The name of the partition.
create_time	DATETIME	The time when the partition was created.
last_modified_time	DATETIME	The time when the partition was last modified.
last_access_time	DATETIME	The time when the partition was last accessed. Note The data collection method is upgraded from July 2023. The time specified by the last_access_time parameter for a partition that is not accessed after the upgrade or is accessed by using ALGO jobs or the direct read method of Hologres cannot be collected.
data_length	BIGINT	The data size of the partition. Unit: bytes.
is_archived	BOOLEAN	A reserved field.
is_exstore	BOOLEAN	A reserved field.
storage_tier	STRING	Tiered storage identification. Valid values: standard: the Standard storage. lowfrequency: the IA storage. longterm: the long-term storage.
cluster_type	STRING	The clustering type of the MaxCompute table. Valid values: HASH RANGE
number_buckets	BIGINT	Optional. The number of buckets in the clustered table. The value 0 indicates that the number of buckets dynamically changes when a job is running.
lifecycle_enabled	BOOLEAN	Specifies whether the lifecycle is enabled on the partition.

RESOURCES

Displays resource information in a project.

Field	Data type	Description
resource_catalog	STRING	The name of the project to which the resource belongs.
resource_schema	STRING	The schema of the resource. The current value is NULL.
resource_name	STRING	The resource name.
resource_type	STRING	The type of the resource. Valid values: archive py jar table
owner_id	STRING	The ID of the resource owner.
owner_name	STRING	The name of the Alibaba Cloud account of the resource owner.
create_time	DATETIME	The time when the resource was created.
last_modified_time	DATETIME	The time when the table was last modified.
size	BIGINT	The storage space that is occupied by the resource. Unit: bytes.
comment	STRING	The comments on the resource.
is_temp_resource	BOOLEAN	Specifies whether the resource is a temporary resource.

RESOURCE_PRIVILEGES

Displays the permission information of resources in a project.

Field	Data type	Description
resource_catalog	STRING	The name of the project to which the resource belongs.
resource_schema	STRING	The schema of the resource. The current value is NULL.
resource_name	STRING	The resource name.
user_catalog	STRING	The project to which the authorized account belongs.
user_name	STRING	The name of the account to which the permissions are granted.
user_id	STRING	The ID of the account to which the permissions are granted.
grantor	STRING	The account that grants the permissions to a RAM user. This is a reserved field.
privilege_type	STRING	The type of the permission.

ROLES

Displays project-level roles and tenant-level roles.

Field	Data type	Description
role_catalog	STRING	The name of the project to which the role belongs. If a tenant-level role is used, the value of this parameter is NULL.
role_name	STRING	The name of the role.
role_label	STRING	The label of the role.
comment	STRING	The comments on the role.

TABLES

Displays the table information in a project.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
table_type	STRING	The type of the table. Valid values: MANAGED_TABLE VIRTUAL_VIEW EXTERNAL_TABLE MATERIALIZED_VIEW
is_partitioned	BOOLEAN	Specifies whether the table is a partitioned table.
owner_id	STRING	The ID of the table owner.
owner_name	STRING	The name of the Alibaba Cloud account of the table owner.
create_time	STRING	The time when the data table was created.
last_modified_time	STRING	The time when the table data was last modified.
last_access_time	STRING	The time when the table data was last queried. Note The data collection method is upgraded from July 2023. The time specified by the last_access_time parameter for a table that is not accessed after the upgrade or is accessed by using ALGO jobs or the direct read method of Hologres cannot be collected.
data_length	BIGINT	The size of data. Unit: bytes. If the table is a non-partitioned table, the value of this parameter is the size of the table data. If the table is a partitioned table, the system does not calculate the size of the table data. In this case, the value of this parameter is NULL. The PARTITIONS view includes the data size of each partition in a partitioned table.
table_comment	STRING	The comments on the table.
lifecycle	BIGINT	The lifecycle of the table. Unit: days.
lifecycle_enabled	BOOLEAN	Specifies whether the lifecycle is enabled.
is_archived	BOOLEAN	A reserved field.
table_exstore_type	STRING	Optional. This parameter specifies whether the current table is a logical or physical table of the extreme storage table. Valid values: EXSTORE_TABLE_VIRTUAL EXSTORE_TABLE_PHYSICAL
storage_tier	STRING	Tiered storage identification. Valid values: standard: the Standard storage. lowfrequency: the IA storage. longterm: the long-term storage.
cluster_type	STRING	The clustering type of the MaxCompute table. Valid values: HASH RANGE
number_buckets	BIGINT	The number of buckets in the clustering table. The value 0 indicates that the number of buckets dynamically changes when a job is running.
view_original_text	STRING	The view definition in the table of the VIRTUAL_VIEW type.

TABLE_LABEL_GRANTS

Displays information about label-based access control.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
user_catalog	STRING	The project to which the authorized account belongs.
user_name	STRING	The name of the account to which permissions are granted.
user_id	STRING	The ID of the account to which the permissions are granted.
grantor	STRING	The account that grants the permissions to a RAM user. This is a reserved field.
label_level	STRING	The level of the label.
expired	DATATIME	The time when the authorization expires.

TABLE_LABELS

Displays the label information of tables in a project.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
label_type	STRING	The type of the label.
label_level	BIGINT	The level of the label.

TABLE_PRIVILEGES

Displays the permission information of tables in a project.

Field	Data type	Description
table_catalog	STRING	The name of the project to which the table belongs.
table_schema	STRING	The schema of the table. The current value is NULL.
table_name	STRING	The name of the table.
user_catalog	STRING	The project to which the authorized account belongs.
user_name	STRING	The name of the account to which permissions are granted.
user_id	STRING	The ID of the account to which the permissions are granted.
grantor	STRING	The account that grants the permissions to a RAM user. This is a reserved field.
privilege_type	STRING	The type of the permission.

TASKS

Displays real-time snapshots of the jobs that are running. This view is used to monitor jobs in real time.

Field	Data type	Description
task_catalog	STRING	The name of the project to which the job belongs.
task_name	STRING	The name of the job.
task_type	STRING	The type of the job. Valid values: SQL: an SQL job. CUPID: a Spark or Mars job. SQLCost: an SQL cost estimation job. SQLRT: an MCQA SQL job. LOT: a MapReduce job. PS: a job of the parameter server (PS) of Platform for AI (PAI). AlgoTask: a PAI job.
inst_id	STRING	The ID of the instance that is created for the job.
status	STRING	The job state. Valid values: Running Waiting
owner_id	STRING	The ID of the Alibaba Cloud account that submits the job.
owner_name	STRING	The name of the Alibaba Cloud account that submits the job.
start_time	DATETIME	The time when the job starts.
priority	BIGINT	The priority of the job.
signature	STRING	The job signature.
quota_name	STRING	The name of the computing quota.
cpu_usage	BIGINT	The current CPU utilization. The value of this parameter is calculated by using the following formula: Number of CPU cores × 100.
mem_usage	BIGINT	The current memory usage. Unit: MB.
gpu_usage	BIGINT	The current GPU utilization. The value of this parameter is calculated by using the following formula: Number of GPUs × 100.
total_cpu_usage	BIGINT	The accumulated CPU utilization. The value of this parameter is calculated by using the following formula: Number of CPU cores × 100 × Duration for which the job runs (seconds).
total_mem_usage	BIGINT	The accumulated memory usage. The value of this parameter is calculated by using the following formula: Current memory usage (MB) × Duration for which the job runs (seconds).
total_gpu_usage	BIGINT	The accumulated GPU utilization. The value of this parameter is calculated by using the following formula: Number of GPUs × 100 × Duration for which the job runs (seconds).
cpu_min_ratio	BIGINT	The ratio of the CPU utilization of the job to the minimum CPU utilization.
mem_min_ratio	BIGINT	The ratio of the memory consumed by the job to the minimum memory usage.
gpu_min_ratio	BIGINT	The ratio of the GPUs consumed by the job to the minimum GPU utilization.
cpu_max_ratio	BIGINT	The ratio of the CPU utilization of the job to the maximum CPU utilization.
mem_max_ratio	BIGINT	The ratio of the memory consumed by the job to the maximum memory usage.
gpu_max_ratio	BIGINT	The ratio of the GPUs consumed by the job to the maximum GPU utilization.
settings	STRING	The information that is scheduled by the upper layer application or specified by users. The information is saved in the JSON format. The information includes fields such as USERAGENT, BIZID, SKYNET_ID, and SKYNET_NODENAME.
additional_info	STRING	The additional information. This is a reserved field.

TASKS_HISTORY

Displays the history of completed jobs in a project. The data of the previous 14 days is retained.

Field	Data type	Description
task_catalog	STRING	The name of the project to which the job belongs.
task_name	STRING	The name of the job.
task_type	STRING	The type of the job. Valid values: SQL: an SQL job. CUPID: a Spark or Mars job. SQLCost: an SQL cost estimation job. SQLRT: an MCQA SQL job. LOT: a MapReduce job. PS: a job of the PS of PAI. AlgoTask: a PAI job. No resource consumption and data scanning information are available.
inst_id	STRING	The ID of the instance that is created for the job.
status	STRING	The status of the job at the point in time when data is collected. This is not a real-time state. Valid values: Terminated: The job is complete. Failed: The job fails. Cancelled: The job is canceled.
owner_id	STRING	The ID of the Alibaba Cloud account that submits the job.
owner_name	STRING	The name of the Alibaba Cloud account that submits the job.
result	STRING	The error message that appears if an error occurs in the job.
priority	BIGINT	The priority of the job.
submit_time	DATETIME	The time when the job is submitted, which is the time when the instance is generated.
start_time	DATATIME	The time when the job starts. For example, you can set this parameter to the time when SQL statements start to be executed for code compilation.
end_time	DATATIME	The time when the job is complete.
input_records	BIGINT	The number of input records. Note If an SQL job meets the conditions of the caching mechanism for MaxCompute Query Acceleration (MCQA), the value of this parameter is NULL.
output_records	BIGINT	The number of output records. Note If an SQL job meets the conditions of the caching mechanism for MCQA, the value of this parameter is NULL.
input_bytes	BIGINT	The amount of input data for the Standard storage. Unit: bytes. Note If an SQL job meets the conditions of the caching mechanism for MCQA, the value of this parameter is NULL.
lowfrequency_storage_input_bytes	BIGINT	The amount of input data for the IA storage. Unit: bytes. Note If an SQL job meets the conditions of the caching mechanism for MaxCompute Query Acceleration (MCQA), the value of this parameter is NULL.
longterm_storage_input_bytes	BIGINT	The amount of input data for the long-term storage. Unit: bytes. Note If an SQL job meets the conditions of the caching mechanism for MaxCompute Query Acceleration (MCQA), the value of this parameter is NULL.
oss_input_bytes	BIGINT	The amount of input data for the OSS external table. Unit: bytes. Note If an SQL job meets the conditions of the caching mechanism for MaxCompute Query Acceleration (MCQA), the value of this parameter is NULL.
tablestore_input_bytes	BIGINT	The amount of input data for the Tablestore external table. Unit: bytes. Note If an SQL job meets the conditions of the caching mechanism for MaxCompute Query Acceleration (MCQA), the value of this parameter is NULL.
output_bytes	BIGINT	The amount of output data. Unit: bytes. Note If an SQL job meets the conditions of the caching mechanism for MCQA, the value of this parameter is NULL.
input_tables	STRING	The list of input tables. This parameter is available only for SQL jobs. Note If an SQL job meets the conditions of the caching mechanism for MCQA, the value of this parameter is NULL.
output_tables	STRING	The list of output tables. This parameter is available only for SQL jobs. Note If an SQL job meets the conditions of the caching mechanism for MCQA, the value of this parameter is NULL.
operation_text	STRING	The job statement. The statement cannot exceed 256 KB in size.
signature	STRING	The job signature.
quota_name	STRING	The name of the computing quota.
complexity	DOUBLE	The complexity of the SQL job.
cost_cpu	DOUBLE	The CPU utilization of the job. The value of this parameter is calculated by using the following formula: Number of CPU cores × 100 × Duration for which the job runs (seconds). The value 100 indicates that `one CPU core runs for one second`. For example, if 10 CPU cores run for 5 seconds, cost_cpu is 5000, which is calculated by using the following formula: 10 × 100 × 5.
cost_mem	DOUBLE	The memory usage of the job. The value of this parameter is calculated by using the following formula: Current memory usage (MB) × Duration for which the job runs (seconds).
settings	STRING	The information that is scheduled by the upper layer application or specified by users. The information is saved in the JSON format. The information includes fields such as USERAGENT, BIZID, SKYNET_ID, and SKYNET_NODENAME.
ext_platform_id	STRING	The ID of the upper-layer scheduling platform.
ext_node_id	STRING	The ID of the upper-layer scheduling node.
ext_bizdate	STRING	The business date of the upper-layer scheduling task.
ext_task_id	STRING	The ID of the task of the upper-layer scheduling node.
ext_dagtype	STRING	The mode in which the upper-layer scheduling node runs.
ext_node_name	STRING	The name of the upper-layer scheduling node.
ext_node_onduty	STRING	The ID of the owner of the upper-layer scheduling node.
ext_node_priority	BIGINT	The priority of the upper-layer scheduling node.
ext_node_cyctype	STRING	A reserved field.
ext_subtask_id	STRING	The subtask ID of the upper-layer scheduling node.
ds	STRING	The date on which the data was archived. Data is archived by the UTC+8 time zone based on `start_time` of jobs.

TUNNELS_HISTORY

Displays historical data that is uploaded and downloaded at the same time over a data tunnel. Data of the previous 14 days is retained.

Field	Data type	Description
tunnel_catalog	STRING	The project to which the resource belongs.
tunnel_schema	STRING	The schema of the resource on which the operation is performed. The current value is NULL.
session_id	STRING	The ID of the session.
operate_type	STRING	The type of the change to the instance. Valid values: UPLOADLOG DOWNLOADLOG DOWNLOADINSTANCELOG STORAGEAPIREAD STORAGEAPIWRITE
tunnel_type	STRING	The type of the tunnel. Valid values: TUNNEL LOG TUNNEL INSTANCE LOG
request_id	STRING	The request ID.
object_type	STRING	The type of the object on which the operation is performed. Valid values: TABLE INSTANCE
object_name	STRING	The name of the object on which the operation is performed. The value can be a table name or an instance ID.
partition_spec	STRING	The partition in the partitioned table to which data is uploaded or from which data is downloaded. Example: `time=20130222, loc=beijing`.
data_size	BIGINT	The size of the data. Unit: bytes.
block_id	BIGINT	The ID of the block that is uploaded by using a tunnel. This parameter is available only if operate_type is set to UPLOADLOG. Otherwise, this parameter is left empty.
offset	BIGINT	The number of records to skip before data is downloaded. By default, the download starts from record 0.
length	BIGINT	The number of records that are downloaded or uploaded. The number of records that are downloaded is the value of the specified length.
owner_id	STRING	The ID of the Alibaba Cloud account of the operator.
owner_name	STRING	The name of the Alibaba Cloud account of the operator.
start_time	DATATIME	The start time of the request.
end_time	DATATIME	The end time of the request.
client_ip	STRING	The IP address of the client that initiates the request.
user_agent	STRING	The information about the user agent, which is the client that initiates the request. The information may be the Java version or the operating system.
columns	STRING	The columns that are specified when data is downloaded by using a tunnel.
quota_name	STRING	The name of the Tunnel quota group.
ds	STRING	The data collection date. Example: `ds=20190101`. Data is archived by the UTC+8 time zone based on `start_time` of requests.

UDF_PRIVILEGES

Displays the permission information of UDFs in a project.

Field	Data type	Description
udf_catalog	STRING	The name of the project to which the UDF belongs.
udf_schema	STRING	The schema of the UDF. The current value is NULL.
udf_name	STRING	The name of the UDF.
user_catalog	STRING	The project to which the authorized account belongs.
user_name	STRING	The name of the account to which permissions are granted.
user_id	STRING	The ID of the account to which the permissions are granted.
grantor	STRING	The account that grants the permissions to a RAM user. This is a reserved field.
privilege_type	STRING	The type of the permission.

UDFS

Displays the UDF information in a project.

Field	Data type	Description
udf_catalog	STRING	The name of the project to which the UDF belongs.
udf_schema	STRING	The schema of the UDF. The current value is NULL.
udf_name	STRING	The name of the UDF.
owner_id	STRING	The ID of the UDF owner.
owner_name	STRING	The name of the Alibaba Cloud account of the UDF owner.
create_time	DATATIME	The time when the UDF was created.
last_modified_time	DATATIME	The time when the UDF was last modified.

UDF_RESOURCES

Displays the resource dependencies of UDFs in a project.

Field	Data type	Description
udf_catalog	STRING	The name of the project to which the UDF belongs.
udf_schema	STRING	The schema of the UDF. The current value is NULL.
udf_name	STRING	The name of the UDF.
resource_catalog	STRING	The name of the project to which the resource belongs.
resource_schema	STRING	The schema of the resource.
resource_name	STRING	The resource name.

USERS

Lists users.

Field	Data type	Description
user_catalog	STRING	The name of the project to which the user belongs. The value NULL indicates a tenant-level user.
identity_provider	STRING	The type of the account. Valid values: ALIYUN RAM RAMRole
user_name	STRING	The name of the user.
user_id	STRING	The ID of the Alibaba Cloud user.
user_label	STRING	The label of the user.

USER_ROLES

Displays the information about the role that the user assumes.

Field	Data type	Description
user_role_catalog	STRING	The name of the project to which the role belongs. The value NULL indicates a tenant-level role.
role_name	STRING	The name of the role.
user_name	STRING	The name of the user.
user_id	STRING	The ID of the Alibaba Cloud user.

SCHEMAS

Displays the schema information of a project.

Field	Data type	Description
schema_catalog	STRING	The name of the project to which the schema belongs.
schema_name	STRING	The name of the schema.
owner_id	STRING	The ID of the Alibaba Cloud account to which the schema belongs.
owner_name	STRING	The name of the Alibaba Cloud account to which the schema belongs.
create_time	DATATIME	The time when the schema was created.
last_modified_time	DATATIME	The time when the schema was last modified.
schema_type	STRING	The type of the schema.
comment	STRING	The comments on the schema.

QUOTA_USAGE

Displays real-time snapshots of resource usage of the subscription computing quota. This view is used to monitor the consumption of computing resources in real time.

Field	Data type	Description
name	STRING	The name of the quota.
create_time	DATETIME	The time when the quota was created.
last_modified_time	DATETIME	The time when the quota was last updated.
cpu_elastic_quota_max	BIGINT	The maximum CPU quota for non-reserved CUs. Unit: `Cores × 100`.
cpu_elastic_quota_min	BIGINT	The minimum CPU quota for non-reserved CUs. Unit: `Cores × 100`.
cpu_elastic_quota_used	BIGINT	The CPU utilization for non-reserved CUs in the quota. Unit: `Cores × 100`.
mem_elastic_quota_max	BIGINT	The maximum memory quota for non-reserved CUs. Unit: `MB`.
mem_elastic_quota_min	BIGINT	The minimum memory quota for non-reserved CUs. Unit: `MB`.
mem_elastic_quota_used	BIGINT	The memory usage for non-reserved CUs in the quota. Unit: `MB`.
cpu_adhoc_quota	BIGINT	The CPU quota for elastically reserved CUs. Unit: `Cores × 100`.
cpu_adhoc_quota_used	BIGINT	The CPU utilization for elastically reserved CUs in the quota. Unit: `Cores × 100`.
mem_adhoc_quota	BIGINT	The memory quota for elastically reserved CUs. Unit: `MB`.
mem_adhoc_quota_used	BIGINT	The memory usage for elastically reserved CUs in the quota. Unit: `MB`.
cpu_quota_max	BIGINT	The maximum CPU quota for reserved CUs. Unit: `Cores × 100`.
cpu_quota_min	BIGINT	The minimum CPU quota for reserved CUs. Unit: `Cores × 100`.
cpu_quota_used	BIGINT	The CPU utilization for reserved CUs in the quota. Unit: `Cores × 100`.
mem_quota_max	BIGINT	The maximum memory usage for reserved CUs in the quota. Unit: `MB`.
mem_quota_min	BIGINT	The minimum memory usage for reserved CUs in the quota. Unit: `MB`.
mem_quota_used	BIGINT	The memory usage for reserved CUs in the quota. Unit: `MB`.
region	STRING	The region in which the resource resides.

VOLUMES

Lists the volumes of MaxCompute. The latency is about 3 hours.

Field	Data type	Description
volume_catalog	STRING	The name of the project to which the volume belongs.
volume_name	STRING	The name of the volume.
volume_type	STRING	The type of the volume. Valid values: INTERNAL EXTERNAL
owner_id	STRING	The ID of the volume owner.
owner_name	STRING	The Alibaba Cloud account name of the volume owner.
create_time	DATETIME	The time when the volume was created.
last_modified_time	DATETIME	The time when the data of the volume was last updated.
location	STRING	The storage path of the volume.
comment	STRING	The comments on the volume.
storage_provider	STRING	The storage engine of the volume.
role_arn	STRING	The Alibaba Cloud Resource Name (ARN) of the storage access role of the volume.
lifecycle	BIGINT	The lifecycle of the volume. Unit: days.
options	STRING	The option parameter of the volume.

FOREIGN_SERVERS

Lists the foreign servers of MaxCompute. The latency is about 3 hours.

Field	Data type	Description
server_name	STRING	The name of the server.
server_type	STRING	The type of the server.
owner_id	STRING	The ID of the server owner.
owner_name	STRING	The Alibaba Cloud account name of the server owner.
create_time	DATETIME	The time when the server was created.
last_modified_time	DATETIME	The time when the data was last updated.
options	STRING	The option parameter of the server.