Hologres:Release notes for Serverless Computing

Hologres version

Feature

Description

V4.0.1

Serverless Computing supports reading from and writing to Data Lake Formation (DLF) foreign tables.

See OSS data lake acceleration.

Hologres version

Description

Remarks

V3.1.11

When you execute batch import tasks using serverless resources, you can also use serverless resources synchronously to perform compaction, rather than performing it asynchronously with the local resources of the instance.

For more information, see Compaction (beta).

V3.1.5

An upper limit of daily resource usage for Serverless Computing can be configured. Once the limit is exceeded, SQL queries will either be executed using the instance's own resources or return an error.

For more information, see Daily cumulative usage limit.

V3.1.3

You are allowed to read data from or write data to encrypted tables, including Hologres internal tables and Hologres external tables created in MaxCompute. To use this feature, you must enable the GUC parameter hg_serverless_computing_enable_encrypted_table.

For more information, see Data encryption.

V3.1.1

The system supports adaptive serverless computing, allowing large queries to automatically utilize serverless resources.

For more information, see Serverless Computing guide.

Hologres version

Description

Remarks

V3.0.26

• Serverless computing resources can be used to execute DML and DQL statements in stored procedures.

• Serverless computing resources can be used to execute INSERT OVERWRITE statements.

For more information, see Stored procedure (beta) and INSERT OVERWRITE.

V3.0.19

Serverless computing resources can be used to execute RESHARDING tasks.

For more information, see User guide of table groups and shard counts.

V3.0.10

Serverless computing resources can be configured to execute all SQL statements in a specific query queue.

For more information, see Query queue.

V3.0.9

Serverless computing resources can be used to execute the CREATE TABLE AS statement.

The CREATE TABLE AS statement generates two records in the metadata warehouse. One record describes the CREATE TABLE AS statement, and the other record describes the INSERT statement that is actually executed by using serverless computing resources. For more information, see CREATE TABLE AS.

V3.0.1

Serverless computing resources can be used to perform COPY operations, including running the hg_dump_to_oss command to export data to OSS.

Two records are generated in the metadata warehouse for each COPY operation. One record describes the COPY statement, and the other record describes the INSERT statement that is actually executed by using serverless computing resources. For more information, see COPY.

Hologres version

Description

Remarks

V2.2.42

Serverless computing resources can be used to execute RESHARDING tasks.

For more information, see User guide of table groups and shard counts.

V2.2.14

Data query language (DQL) tasks are supported by the Serverless Computing feature.

For more information, see Serverless Computing.

V2.2.10

An eight-hour limit on the query execution duration is added to the Serverless Computing feature.

The Serverless Computing feature uses the smaller value between the eight-hour limit and the value of the statement_timeout parameter as the allowed maximum execution duration. For more information, see Manage queries.

V2.2.7

By default, all tasks that are performed by using serverless computing resources are recorded in slow query logs.

In versions earlier than V2.2.7, only failed queries and queries that are successfully performed by executing DML statements and consume more than 100 ms are recorded in slow query logs.

V2.2.4

If Data Lake Formation (DLF) foreign tables are specified in SQL statements, instance reserved resources are automatically used rather than serverless computing resources.

You cannot use serverless computing resources to perform data queries and writes by using Data Lake Formation (DLF) foreign tables. For more information, see the Serverless Computing guide section of the "User guide on Serverless Computing" topic.

V2.2.1

The following metrics are supported by Serverless Computing:

• Serverless Computing Queue Size(count)

• Serverless Computing Quota Usage(%)

For more information, see Monitoring metrics.

Hologres version

Description

Remarks

V2.1.38

An eight-hour limit on the query execution duration is added to the Serverless Computing feature.

The Serverless Computing feature uses the smaller value between the eight-hour limit and the value of the statement_timeout parameter as the allowed maximum execution duration. For more information, see Manage queries.

V2.1.31

If DLF foreign tables are specified in SQL statements, instance reserved resources are automatically used rather than serverless computing resources.

You cannot use serverless computing resources to perform data queries and writes by using DLF foreign tables. For more information, see the Serverless Computing guide section of the "User guide on Serverless Computing" topic.

V2.1.18

The hologres.hg_serverless_computing_query_log view is supported.

You can use the view to query historical tasks that are performed by using serverless computing resources.

V2.1.17

The Serverless Computing feature is released.

For more information, see Serverless Computing.