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TDSQL-C for MySQL
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    Release Notes

    Last updated: 2024-03-26 16:40:53
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      December 2023

      Update
      Description
      Release Date
      Documentation
      Upgrade of distributed shared storage architecture
      The distributed shared storage architecture of TDSQL-C MySQL has undergone the following optimization upgrades.
      Optimized the key pathways such as log transmission, persistence, data page replay, and redundant page cleanup. Enhanced the efficiency of redo replay/merge, reduced additional performance loss and resource contention. This significantly improved the stability of the storage layer, reducing access latency by more than 30% and decreasing network jitter spikes by over 100%.
      The optimization of the backup rollback module has resolved the issue of unstable rates in exceptional scenarios of snapshot backup and logical backup, thereby further enhancing the efficiency of parallel rollbacks.
      2023-12-29
      -

      November 2023

      Update
      Description
      Release Date
      Documentation
      Supports Cloud Log Service (CLS)
      TDSQL-C MySQL supports the collection of slow log data from instances, and the shipping of it to CLS for analysis. This provides a comprehensive log service from log collection and storage to log search, facilitating swift monitoring and pinpointing of business issues.
      2023-11-20
      Log Service CLS

      October 2023

      Update
      Description
      Release Date
      Documentation
      Supports Column Store Index (CSI)
      TDSQL-C MySQL supports the CSI column storage index feature, a technology that utilizes columnar data format for the storage, retrieval, and management of data. This provides superior query performance and a higher data compression ratio.
      2023-10-30

      September 2023

      Update
      Description
      Release Date
      Documentation
      Database audit optimization
      TDSQL-C MySQL has implemented the following optimizations for database auditing.
      Supports binding multiple rule templates to an instance.
      The relationship between the rule template and the instance has been adjusted from initialization to strong binding, meaning that modifications to the content of the rule template will synchronously affect the audit rules applied by the instances that have bound this rule template.
      Supports viewing the rule templates bound to each instance, the audit rules hit by each audit log, and the instances associated with each rule template.
      Integrates with the Event Bus and Tencent Cloud Observability Platform. Supports high, medium, and low risk event alarms.
      The procedures for rule audit, setting risk levels, and alarm strategies, as well as post-event alarms, needs the submission of a ticket for application.
      2023-09-25
      Enabling Audit Service
      Creating Rule Template
      Post-Event Alarm Configuration
      Supports cross-region backup
      TDSQL-C MySQL supports cross-regional backup feature, ensuring high availability for database recovery, meeting data availability and security requirements, remote backup recovery, remote disaster recovery, long-term data archiving, and regulatory compliance.
      2023-09-21
      Cross-regional backup

      August 2023

      Update
      Description
      Release Date
      Documentation
      ‌Updated TXSQL kernel features
      TXSQL kernel features are updated to enhance database performance and stability. TDSQL-C for MySQL 5.7 kernel version is updated to v2.1.10, which supports binlog subscription for read-only instances, blackhole engine, and buffer pool resizing.
      2023-08-25
      ‌Updated TXSQL kernel features
      TXSQL kernel features are updated to enhance database performance and stability.
      TDSQL-C for MySQL 8.0 kernel version has been updated to 3.1.10, and TDSQL-C for MySQL 5.7 kernel version has been updated to v.2.1.9. Both kernel versions now support automatic killing of idle transactions, dynamic thread pool, NOWAIT syntax, and invisible index.
      Kernel 3.1.10 additionally supports the following new features: flashback query, optimization of plan caching point query, statement outline, binlog subscription for read-only instances, blackhole engine, and improved parallel query.
      Kernel 2.1.9 additionally supports the following new features: returning‌, auto-increment column persistence‌, computation pushdown‌, buffer pool initialization, and hotspot update protection.
      2023-08-22
      Supported mounting read-only instances for serverless clusters
      Serverless clusters support mounting read-only instances, allowing separate configuration of compute unit range for read-only instances. They also support automatic start and stop of read-only instances, which enhances read performance and concurrency while reducing the load on the read-write instance.
      2023-08-18
      Optimized database audit
      TDSQL-C for MySQL has optimized the audit log page and added multiple search modes, including Include/Exclude, OR/AND, and Segment/Wildcard`.
      2023-08-09

      July 2023

      Update
      Description
      Release Date
      Documentation
      Optimized database audit
      TDSQL-C for MySQL has optimized the audit log page and added multiple search modes, such as fuzzy/exact/forward/reverse/simple/complex search. The units of the audit log fields Execution Time and CPU Time in the console and downloaded audit log files are all adjusted to microseconds.
      2023-07-12

      May 2023

      Update
      Description
      Release Date
      Documentation
      Launched serverless resource pack
      TDSQL-C for MySQL has launched prepaid serverless resource pack. By purchasing a resource pack, you can reserve resources in advance. Compared to the pay-as-you-go option, the resource packs can help you save more costs. It is more cost-effective to purchase larger capacity.
      2023-05-31
      Launched a new version of database proxy
      TDSQL-C for MySQL has released a new version of database proxy. It provides powerful features such as automatic read/write separation, transaction split, and connection pool. It also supports enabling multiple database proxy access addresses (custom routing) to meet the requirements in different business scenarios.
      2023-05-10

      March 2023

      Update
      Description
      Release Date
      Documentation
      Supported instance-level independent IP address
      You can set an independent network IP address for the TDSQL-C for MySQL read-write instance or any read-only instance in the cluster, and access the specified instance in the cluster via the corresponding address. Meanwhile, new clusters and existing clusters with only read-write instances no longer support the address connection for read-only groups.
      2023-03-13

      January 2023

      Update
      Description
      Release Date
      Documentation
      Supported the tab view in the console
      The TDSQL-C for MySQL console supports the tab and list views. You can switch the view in the cluster list as needed to query and browse cluster information more clearly.
      2023-01-05

      December 2022

      Update
      Description
      Release Date
      Documentation
      Supported global and session parameter settings
      TDSQL-C for MySQL provides the Global Parameters field to help you quickly distinguish between global and session parameters. Once configured, values of global parameters will take effect for all instances in the cluster, while values of session parameters will only apply to the target instance and can be synced to other instances.
      2022-12-16
      Supported formula-based parameter settings and optimized the parameter template
      TDSQL-C for MySQL offers more parameter configuration methods and supports default or custom formula-based parameter values to better adapt to your database. You can save parameter settings as a template to import and export parameters, which facilitates the batch management of database clusters.
      2022-12-16
      Launched the new audit service
      TDSQL-C for MySQL has launched a new audit service that supports both full and rule-based audit. The service can protect your data from tampering and ensure its integrity and reliability during collection, transfer, and storage.
      2022-12-15

      October 2022

      Update
      Description
      Release Date
      Documentation
      Supported parallel query
      TDSQL-C for MySQL supports parallel query, which schedules and leverages multiple compute resources to greatly shorten the response time of large queries.
      2022-10-24

      September 2022

      Update
      Description
      Release Date
      Documentation
      Supported infrequent access storage for audit
      Tencent Cloud provides the infrequent access storage option for TDSQL-C for MySQL audit. You can select a suitable storage type based on your actual storage frequency to reduce audit costs.
      2022-09-30

      August 2022

      Update
      Description
      Release Date
      Documentation
      Supported custom password strength
      TDSQL-C for MySQL supports the custom password strength feature to protect the database security and meet your needs for compliance with applicable regulations.
      2022-08-22
      Optimized the monitoring and alarming feature
      TDSQL-C for MySQL adds new monitoring metrics, optimizes metric names, parameters, units, collection/calculation/aggregation methods, the entry to the monitoring feature, and the monitoring page, and is connected to the alarming feature of EventBridge. This improves the system stability and Ops efficiency and reduces the Ops costs, helping you easily stay up to date with the overall database resource usage and status.
      2022-08-05

      July 2022

      Update
      Description
      Release Date
      Documentation
      Supported database proxy
      TDSQL-C for MySQL supports database proxy between TencentDB services and user applications. With this feature, all database access requests from the applications are proxied, with writes and reads relayed separately to the source and replica databases to relieve the source database.
      2022-07-11

      May 2022

      Update
      Description
      Release Date
      Documentation
      Supported querying and downloading slow query log
      TDSQL-C for MySQL supports slow log details query and download. You can download log files in CSV format or native format (supported by open-source analysis tools) to identify and optimize inefficient SQL statements and thus improve the efficiency and performance.
      2022-05-31
      Optimized the backup management feature
      TDSQL-C for MySQL optimizes the backup management feature. It supports logical backup and snapshot backup, manual backup download and deletion, and backup retention period customization. This improves the integrity of the data backup and rollback features.
      2022-05-30

      March 2022

      Update
      Description
      Release Date
      Documentation
      Released TDSQL-C for MySQL performance test reports
      TDSQL-C for MySQL performance test reports are released. The tests compare TDSQL-C for MySQL and TencentDB for MySQL in write, read, and read-write scenarios. Test results show that TDSQL-C for MySQL performs better.
      2022-03-28

      February 2022

      Update
      Description
      Release Date
      Documentation
      Updated the kernel minor version of TDSQL-C for MySQL 5.7
      v2.0.15: Supported extended tablespace and added new JSON functions: JSON_MERGE_PRESERVE, JSON_MERGE_PATCH, JSON_PRETTY, JSON_STORAGE_SIZE, JSON_ARRAYAGG, JSON_OBJECTAGG.
      v2.0.16: Optimized undo space truncate to improve the speed of undo truncate on large-spec instances, and optimized the performance of large range queries on read-only instances.
      2022-02

      January 2022

      Update
      Description
      Release Date
      Documentation
      Supported read-only instance expansion in TDSQL-C for MySQL 8.0
      After the kernel version of TDSQL-C for MySQL 8.0 is upgraded to 3.1.2, it supports read-only instance expansion, which significantly improves the read performance scalability of database clusters.
      2022-01

      November 2021

      Update
      Description
      Release Date
      Documentation
      Supported multi-AZ deployment
      The engine of TDSQL-C for MySQL supports creating a cluster deployed across AZs. Compared with a single-AZ cluster, a multi-AZ one has better disaster recovery capabilities and can protect your database from being affected by database instance failures, AZ outages, and even IDC-level failures.
      2021-11

      October 2021

      Update
      Description
      Release Date
      Documentation
      Supported data subscription
      DTS supports the migration of various relational databases including TDSQL-C for MySQL as well as NoSQL databases. You can use data subscription to meet your requirements for commercial data mining and async business decoupling.
      2021-10
      Supported automatic fragmented space reclaim
      TDSQL-C for MySQL can automatically reclaim fragmented space after data deletion, which reduces the storage costs.
      2021-10
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      September 2021

      Update
      Description
      Release Date
      Documentation
      Supported MySQL 8.0
      The engine kernel of TDSQL-C for MySQL now supports MySQL 8.0. Combined with a complete set of management services and proprietary kernel features, it provides more stable and faster cloud native database services that are easier to deploy in more industries and help upgrade your business. Currently, this version doesn't support adding read-only instances.
      2021-09
      -
      Supported instant DDL
      TDSQL-C for MySQL supports the instant DDL feature to quickly modify columns in big tables while avoiding data replication. This feature can implement changes in seconds without replicating data or using disk capacity or I/O during peak hours.
      2021-09

      August 2021

      Update
      Description
      Release Date
      Documentation
      Displayed project group information in the TDSQL-C for MySQL audit bills
      Exported bills display the project group information of database instances for you to categorize bills and collect statistics by project group.
      2021-08
      Displayed the instance name in TDSQL-C for MySQL audit
      The original “Instance ID” column in the instance list is changed to “Instance ID/Name” to add the instance name for locating instances more quickly.
      2021-08
      -
      Supported seven days as the log retention period in TDSQL-C for MySQL audit
      When audit is newly enabled, you can set the log retention period to seven days. This is suitable for scenarios where you want to observe execution conditions and analyze discovered database problems for a short time. For instances with audit already enabled, you can also change the log retention period to seven days.
      2021-08
      Optimized search in TDSQL-C for MySQL audit
      Fuzzy search is supported, multiple SQL types can be used together for filtering, and the 24-hour limit on the search time period is removed.
      2021-08

      June 2021

      Update
      Description
      Release Date
      Documentation
      Supported monthly subscription for storage billing
      The monthly subscription (prepaid) billing mode is supported for storage. If you have a monthly-subscribed compute node in Provisioned Resource mode, you can select monthly subscription for storage.
      2021-06
      Improved serverless compute specifications
      In serverless billing mode, the elastic computing power can be configured to up to 16 cores.
      2021-06

      May 2021

      Update
      Description
      Release Date
      Documentation
      Supported database audit
      TDSQL-C for MySQL supports database audit to log the fine-grained audit results of database operations and manage operation compliance. This feature helps you get a whole picture of all database SQL operations. It also provides detailed backtracking data of database operations and enables convenient accountability for database security incidents.
      2021-05

      March 2021

      Update
      Description
      Release Date
      Documentation
      Supported database and table-level rollback
      TDSQL-C can roll back databases/tables to the original cluster and roll back an entire cluster (clone) to a new cluster. You can choose different rollback methods according to your business needs.
      2021-03

      December 2020

      Update
      Description
      Release Date
      Documentation
      Supported the change from pay-as-you-go to serverless billing
      The billing mode of TDSQL-C for MySQL can be changed from pay-as-you-go to serverless. TDSQL-C for MySQL implements the change by converting the cluster type on the backend. After the change, the bills and details will change, while the payment mode will still be pay-as-you-go.
      2020-12
      Change from Pay-as-You-Go to Serverless Billing
      Supported the change from pay-as-you-go to monthly subscription
      The billing mode of TDSQL-C for MySQL can be changed from pay-as-you-go to monthly subscription. TDSQL-C for MySQL implements the change by generating renewal orders, so you need to make the corresponding payment promptly to ensure that the billing mode change is successful.
      2020-12
      Renamed TencentDB for CynosDB
      TencentDB for CynosDB was renamed TDSQL-C on December 24, 2020.
      2020-12
      Launched serverless service
      TencentDB for CynosDB Serverless Edition adopts the serverless architecture for cloud native database services. It is billed based on the actual computing and storage resource usage, so you only need to pay for what you use while enjoying the cloud native technologies of Tencent Cloud.
      2020-12

      July 2020

      Update
      Description
      Release Date
      Documentation
      Supported adding read-only instances
      TencentDB for CynosDB allows you to create one or more read-only instances in a cluster, which are suitable for read/write separation and one-write-multiple-read application scenarios and capable of greatly enhancing the read load capacity of your database cluster.
      2020-07
      Supported migrating data with DTS
      TencentDB for CynosDB supports migrating data from MySQL 5.7 to CynosDB for MySQL through DTS.
      2020-07
      
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