This topic describes the release notes for AnalyticDB for MySQL and provides links to the relevant references.

August 2022

V3.1.5

Category Feature Description References
New feature Enhancement of DECIMAL data type Decimal numbers can be converted to a higher precision, and variable-length decimal numbers are supported. This feature improves the I/O efficiency of DECIMAL data. None
Table-level throttling The writing rate of DML statements is limited for specific tables to ensure overall performance. By default, table-level throttling is disabled. None
Memory management on wide tables The memory management on wide tables is optimized to reduce the consumption of memory resources. None
JSON_UNQUOTE function This function can be used to unquote the value specified by json_value, escape specific characters in json_value, and then return the processing result. JSON_UNQUOTE
JSON_CONTAINS function This function can be used to determine whether a given candidate is contained within a JSON document or whether the candidate exists at a specified path within the JSON document. JSON_CONTAINS
JSON_CONTAINS_PATH function This function can be used to determine whether a specified path exists in the given JSON document. JSON_CONTAINS_PATH
Optimized feature
  • TopN operator: In scenarios where the ROW_NUMBER() function is used to sort data and the WHERE clause is used to implement semantics of TopN, a variety of measures such as sorting, condition pushdown, and pre-aggregation can be taken to reduce the amount of data involved in computing and transmission. The performance of TopN operators can be improved tenfold while memory consumption is reduced by 90%.
  • Window operator: General-use window functions are optimized to improve performance by three to seven times. Different algorithms are used based on different data features such as data aggregation degree and sequence ordering.
  • Partial Agg operator: Self-adaption capabilities of 2-phase aggregation are improved. Data features of data aggregation are dynamically collected during execution to determine whether pre-aggregation is required. The performance of aggregation operators can be improved by two to four times if no aggregation degree exists.
  • System logs: When the disk usage exceeds the threshold, logs can be automatically cleared.
None
Fixed issue
  • Security vulnerabilities of Apache Log4j are fixed.
  • The RO issue that occurs in special scenarios where Add Key and Drop Column operations are performed is fixed.
  • The issue that occurs in special scenarios where values are converted between DATETIME and YEAR data types is fixed.
None

March 2022

Category Feature Description References
New feature Schema optimization The schema optimization feature is supported to provide optimization suggestions of the hot and cold data optimization, index optimization, and distribution key optimization types based on intelligent statistic analysis. This feature can help reduce costs and improve efficiency for the use of AnalyticDB for MySQL clusters. Schema optimization

December 2021

V3.1.4.13 to V3.1.4.16
Category Feature References
New feature Two data replicas and one log replica can be configured based on the Raft algorithm to ensure data reliability and reduce storage overheads. None
The high availability feature of the nameservice of Apsara File Storage for HDFS is supported when data is exported to HDFS. Use external tables to export data from AnalyticDB for MySQL to Apsara File Storage for HDFS
Optimized feature
  • The lock granularity for CREATE VIEW is optimized to improve concurrency performance.
  • The upload speed of full backup files is increased during the change of computing resources.
  • The index creation performance for complex data types is improved.
  • The memory management of background tasks is optimized.
None
Fixed issue
  • The refresh of materialized views when no data exists is optimized.
  • The error of cost estimation for the Left Join optimizer is decreased.
  • The table creation issue caused by special characters is fixed.
None

September 2021

V3.1.4.12

Category Feature References
Optimized feature The performance of the hash join algorithm to create a hash table is improved. None
Fixed issue
  • The issue that may cause an error to occur in an external table when you insert data from MaxCompute is fixed.
  • The issue that may cause comments that follow a table name to be incorrectly processed in an INSERT statement is fixed.
None

August 2021

V3.1.4.11

Category Feature Description References
New feature API operations related to cluster running reports API operations can be called to query metrics in a cluster running report. The following API operations are available:
  • DescribeTableAccessCount
  • DescribeSqlPattern
  • DescribeDBClusterHealthReport
  • DescribeDBClusterForecast
Optimized feature
  • The download speed of full data is increased.
  • Inappropriate index condition pushdown (ICP) is blocked. By default, 128 indexes are not pushed down. This configuration can be changed.
None
Fixed issue
  • The issue that may cause pushdown failures on the JSON_EXTRACT() function in some scenarios is fixed.
  • The issue that may cause a null pointer exception (NPE) to occur when the DROP COLUMN statement is executed on an external table is fixed.
  • The issue that may cause repeated sequencing to occur when a window operator is applied to pre-grouped partitions is fixed.
None

V3.1.4.10

Category Feature Description References
New feature O&M event management The database upgrade time can be viewed and adjusted in the AnalyticDB for MySQL console. Manage O&M events
Optimized feature
  • The TIME() function can be pushed down.
  • The table scan performance is improved.
  • Mutual exclusion and fair scheduling are supported for data import.
None
Fixed issue
  • The issue that may cause an error to occur during an atomic query when a non-primary key table is being created is fixed.
  • The issue that may cause connections to be closed when a row of a result set exceeds 16 MB in size is fixed.
None

July 2021

V3.1.4.9

Category Feature Description References
New feature Data import to and export from Apsara File Storage for HDFS by using external tables External tables can be used to import Apsara File Storage for HDFS data to AnalyticDB for MySQL and export AnalyticDB for MySQL data to Apsara File Storage for HDFS. Use external tables to import data from Apsara File Storage for HDFS to AnalyticDB for MySQL

Use external tables to export data from AnalyticDB for MySQL to Apsara File Storage for HDFS
SQL diagnostics The details of SQL queries can be viewed and filtered based on categories such as the top 100 most time-consuming queries and queries that failed to be executed. Also, SQL queries can be optimized based on diagnostic results and optimization suggestions. Introduction to SQL diagnostics
End-to-end data management An end-to-end data management portal is added to the AnalyticDB for MySQL console. Data assets can be managed and jobs can be developed and scheduled by using Data Management (DMS). Manage data assets

Develop and schedule tasks
Custom analyzers and dictionaries in full-text search scenarios Custom analyzers and dictionaries can be configured in full-text search scenarios. Custom analyzers and dictionaries
Optimized feature
  • Connections to frontend nodes are optimized from single-threaded connections to multi-threaded connections. This improves write performance in a linear manner.
  • Performance is improved when the TRUNCATE TABLE statement is frequently executed.
  • By default, the REPLACE INTO statement is atomic to prevent sudden changes to data.
None
Fixed issue
  • The issue that may cause the time of the first auto-refresh of materialized views to be inconsistent with the specified time is fixed.
  • The issue that may cause execution failures on SQL statements by using common table expressions (CTEs) is fixed.
  • The issue that may cause an error to occur when the annotated CREATE TABLE statement is executed is fixed.
None

March 2021

V3.1.1.9 to V3.1.3.9

Category Feature Description References
New feature Computing resource grouping The resource pool feature is provided to isolate computing resources by group in clusters in elastic mode. Manage resource groups
Tiered storage of hot and cold data Table data of clusters in elastic mode can be defined as hot or cold data. You can switch between hot and cold storage. Separation of hot and cold data storage
Cluster mode change Clusters can be changed from the reserved mode to the elastic mode. None
Compatibility with time formats in AnalyticDB for MySQL V2.0 Time formats in AnalyticDB for MySQL V2.0 are supported. Example: 2020-08-03T23:59:59. None
Index creation or deletion for JSON fields by executing the ALTER TABLE statement Indexes for JSON fields can be disabled by executing the ALTER TABLE statement. ALTER TABLE
BINARY type The BINARY type is supported for the metadata of the protocol layer. None
Export of file headers during export from AnalyticDB for MySQL to a single Object Storage Service (OSS) object File headers can be exported when you export data from AnalyticDB for MySQL to a single OSS object by using an external table. Use external tables to export data from AnalyticDB for MySQL to OSS
Maximum number of rows that can be generated in an object when you export data from AnalyticDB for MySQL to OSS by using an external table If the number of exported rows exceeds the maximum number, extra rows are exported to one or more new objects. You can specify both the maximum size and maximum number of rows in an object. Written data that first triggers the limit is exported to a new object. None
SQL plan module Execution plans of slow SQL queries can be viewed in the AnalyticDB for MySQL console. Query process and execution plan
INSERT INTO SELECT ON DUPLICATE KEY UPDATE This query is supported when the input values in the UPDATE column are constants or when the input values in the UPDATE column are those in the SELECT column. None
File format of OSS external tables The ORC format is supported for OSS external tables. None
Priority of the BATCH LOAD statement Hints can be used to specify the priority of the BATCH LOAD statement. None
Optimized feature Performance of the LIMIT n statement Performance is improved when you use the pushdown logic of the LIMIT n statement to filter data. None
Compatibility The table creation statement is compatible with the BOOLEAN type. None
Database naming conventions Database names can start with an uppercase letter or an underscore (_). None
Fixed issue The issue that may cause index exceptions when multiple indexes are created or deleted is fixed.
The issue that may cause java.lang.NullPointerException errors is fixed. Such errors may be returned when you execute the INSERT statement in scenarios where a table does not exist.
The issue that may cause data query exceptions is fixed. Such exceptions may occur when OSS partitioned tables are pushed down if Parquet-formatted files contain partition fields.
The issue that may cause the Premature end of Content-Length error to occasionally occur when you access OSS is fixed.
The issue that may cause com.alibaba.fastsql.sql.ast.expr.SQLMethodInvokeExpr cannot be cast to com.alibaba.fastsql.sql.ast.SQLName errors when you execute the ADD KEY statement is fixed.
The issue that may cause no composite key to add errors due to composite keys when tables are managed in hot or cold storage is fixed.

July 2020

V3.1.1.6

Category Feature Description References
New feature Timestamp and Datetime columns When the MODIFY COLUMN statement is executed to modify a Timestamp or Datetime column, the ON UPDATE CURRENT_TIMESTAMP clause is supported. None
Table and column naming conventions Table and column names support Chinese characters. None
Requirements for creating an OSS external table The following requirements must be met when you create an OSS external table:
  • The partition key columns must be specified at the end of the field list. Otherwise, the table cannot be created.
  • The first row in an OSS object can be set as a file header. The system skips the first row when the system reads data from the object.
Use external tables to import data from OSS to AnalyticDB for MySQL
CREATE TABLE AS SELECT The CREATE TABLE AS SELECT statement can be executed to create a table. CTAS
Optimized feature Fields of the BOOLEAN type The default values for the fields of the BOOLEAN type can be 0 or 1. None
SHOW DATABASES The permissions to list databases can be granted when the SHOW DATABASES statement is executed. None
Fixed issue The issue that may cause Not a Number (NaN) errors in statistics is fixed.
The issue that may cause the name of a table created by executing CREATE TABLE to be the same as an existing view name is fixed.
The issue that may cause queries to be more slowly processed when a number of queries fail is fixed.
The issue that may cause only part of data to be returned is fixed. This error may occur when a statement that contains GROUP BY is executed to query data from a table that has a multi-value column.
The issue that may cause only part of data to be read from the end of a table is fixed. This error may occur after the data in an OSS external table is compressed by using GZIP.

April 2020

V3.0.9.6

The following database software upgrades are performed for users of AnalyticDB for MySQL Basic Edition to improve service quality.

Category Feature Description References
New feature Geometry functions Geometry functions are supported. Operation functions
JSON_EXTRACT function The JSON_EXTRACT function is supported. JSON _EXTRACT
INSERT INTO VALUES(FROM_UNIXTIME(...)) The INSERT INTO VALUES(FROM_UNIXTIME(...)) statement is supported. None
Nested-loop join (NLJ) NLJ is supported for data join. None
Power BI connection Power BI can be connected to the protocol layer. None
Database naming conventions Hyphens (-) can be included in database names.
Note Hyphens (-) must be enclosed in backticks (``).
None
Optimized feature Zero dates Zero dates (0000-00-00) are converted to NULL. None
DIV function of the DECIMAL type The DIV function of the DECIMAL type is supported as in MySQL. DIV
CAST function of the JSON type The CAST function is supported for JSON data as in MySQL and Apache Hive. JSON
Slow query logging threshold The slow query logging threshold is set to 1 second. None

March 2020

V3.0.9

Category Feature Description References
New feature JSON data types and related JSON functions Complex JSON data types and related JSON functions are supported.
SELECT NOW() The SELECT NOW() statement is supported. None
Optimized feature Maximum number of tables The maximum number of tables that can be created in a Cluster Edition cluster of the minimum specifications is increased from 512 to 800. The minimum specifications indicate that the Cluster Edition cluster has only two node groups. None
Compatibility with DDL statements Compatibility with DDL statements in AnalyticDB for MySQL V2.0 is improved to enable smooth data migration to AnalyticDB for MySQL V3.0 clusters. Your business is not affected during data migration. None
Compatibility with business intelligence (BI) tools AnalyticDB for MySQL V3.0 improves compatibility with BI tools and is fully compatible with Power BI. Power BI
Fixed issue The issue that may cause unclear errors when the used disk capacity exceeds the threshold during data loading is fixed.

February 2020

V3.0.8

Category Feature Description References
New feature MariaDB JDBC Connector MariaDB Connector/J is supported. None
Specifications applicable to Cluster Edition The storage-intensive specification S8 is added for AnalyticDB for MySQL Cluster Edition clusters. S8 is ideal for scenarios that do not require high concurrency and performance. None
Flexible purchase of clusters Node groups can be purchased and scaled out in pairs. This allows you to purchase clusters on demand and reduces costs. None
Availability in Alibaba Finance Cloud AnalyticDB for MySQL is available in the China East 1 Finance, China East 2 Finance, and China South 1 Finance regions of Alibaba Finance Cloud. None
Availability on the International site (alibabacloud.com) AnalyticDB for MySQL is available in the China (Hong Kong), Indonesia (Jakarta), Malaysia (Kuala Lumpur), India (Mumbai), and Australia (Sydney) regions. None
Optimized feature Time types The TIMESTAMP and DATETIME data types are compatible with the NO_ZERO_DATE mode of MySQL SQL_MODE. None
Fixed issue The issue that may cause incompatibility in boundary processing of the SUBSTRING_INDEX function is fixed.

December 2019

V3.0.7

Category Feature Description References
New feature Specification C24 The compute-intensive specification C24 is added for AnalyticDB for MySQL clusters. C24 is ideal for scenarios that require sophisticated computing capabilities. None
Configuration upgrade Cluster specifications can be upgraded. You can perform switchovers between two of the following specifications within seconds: C8, C4, and C24. None
Monitoring and alerting The monitoring and alerting feature is supported. You can use CloudMonitor to set thresholds for all metrics. An alert is triggered when a threshold is reached. Set an alert rule
Query termination The query termination feature is supported. You can view and terminate running queries in real time in the AnalyticDB for MySQL console. None
Synchronization from PolarDB-X 1.0 to AnalyticDB for MySQL Data Transmission Service (DTS) can be used to synchronize data from PolarDB-X 1.0 to AnalyticDB for MySQL in real time for data analytics. None
Availability on the International site (alibabacloud.com) AnalyticDB for MySQL is released for international use. This service is available in the Singapore (Singapore) and Japan (Tokyo) regions. None
Optimized feature View creation Window functions can be used to create views. None
Use scenarios of CTEs CTEs can be used in the INSERT SELECT FROM clause. INSERT SELECT FROM

September 2019

V3.0.6

Category Feature Description References
New feature Specification C4 The specification C4 is added to simplify the use of AnalyticDB for MySQL. We recommend that you use this specification in learning. None
COLLECT_SET function The COLLECT_SET function is supported. None
Optimized feature Creation and scale-out time for clusters The amount of time spent on creating and scaling out clusters is shortened to reduce costs. None
Fixed issue The issue that may cause ineffective IF NOT EXIST for external tables is fixed.

August 2019

V3.0.5

Category Feature Description References
New feature Default column value The default value of a column can be set to the current time. Example: gmt_create datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP. None
Oracle GoldenGate (OGG) OGG is supported in AnalyticDB for MySQL to enhance data synchronization from Oracle to AnalyticDB for MySQL. None
Disk resizing Flexible disk resizing is supported. This allows you to resize disks on demand and reduces costs. None
Availability in Alibaba Finance Cloud AnalyticDB for MySQL is available in Alibaba Finance Cloud. None
Virtual e-commerce logistics platforms and CloudTmall AnalyticDB for MySQL is available in virtual e-commerce logistics platforms and CloudTmall. None
Optimized feature Error message returned for modifying non-auto-increment keys The error message that is returned when you change non-auto-increment keys to auto-increment keys is optimized to facilitate your understanding. None

July 2019

V3.0.4

Category Feature Description References
New feature Backup The incremental backup and restoration features are supported. You can restore data from backup sets to a point in time to maximize data restorability. None
LOAD DATA The LOAD DATA LOCAL INFILE statement is supported. LOAD DATA LOCAL INFILE
Flexible purchase of services Node groups can be purchased in pairs. For example, you can set Node Groups to 2, 4, 6, or 8 on the AnalyticDB for MySQL buy page. None
Data types and important functions New data types and some important functions are supported. None
Optimized feature Compatibility AnalyticDB for MySQL is fully compatible with Navicat, FineReport, and FineBI, and its compatibility with Sequel Pro is greatly improved. None
Fixed issue The issue that may cause failed support for multiple columns during subquery comparison is fixed.