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Last updated: 2022-07-18 15:56:52

    Genuine License

    Licensed by Microsoft, TencentDB for SQL Server continuously provides you with the latest features, helping you avoid the risks of using unauthorized software and enhance the trustworthiness of your business in competitive markets.

    High Stability and Reliability

    TencentDB for SQL Server delivers a 99.9996% data reliability and 99.95% service availability. Its primary/replica dual-node database architecture allows for switching from a faulty instance to a healthy one in a matter of seconds and enables automatic backup, so the database can be restored to a previous time point through rollback. 

    Best-in-Class Performance

    TencentDB for SQL Server uses enterprise-grade PCI-E SSDs to deliver an industry-leading I/O throughput, outperforming self-built databases and supporting commercial-grade high-volume concurrent business requests.

    Ease of Management

    Various management tasks can be finished with ease in the Tencent Cloud console or SSMS, such as database management, permission configuration, and monitoring and alarming. This eliminates your concerns over database installation and Ops.

    Performance Monitoring

    Dozens of key metrics can be viewed in the console, such as the number of connections and requests, disk I/O, and buffer hit rate, helping you comprehensively monitor database conditions and accurately understand the database load and system health.

    System Alarming

    User-defined resource threshold alarms are supported to help you discover database exceptions timely and resolve potential system problems quickly.

    TencentDB for SQL Server's Strengths over Self-Built SQL Server

    FeatureTencentDB for SQL ServerSelf-Built SQL Server
    Service availabilityFor more information, see Service Level Agreement.You have to guarantee the service availability and set up primary/replica replication and RAID capabilities on your own.
    System securityAnti-DDoS is supported, and various database security vulnerabilities are fixed in time. The data security meets all mainstream national and international security standards.You have to deploy security services and fix vulnerabilities on your own at high costs. Security compliance is not guaranteed, and the security requirements cannot be quickly met.
    Database performanceHigh-performance devices with a TPM of up to 4.5 million are used. For more information, see Performance Test Report.General devices without optimization and fine-tuning are used.
    Software and hardware investmentNo hardware or software investment is required, and the service is pay-as-you-go.Database servers are costly.
    System hostingThere are no hosting fees.The hosting fees are high.
    Deployment and scalingThe out-of-the-box service can be quickly deployed and elastically scaled.You have to purchase hardware devices, host them in data centers, and deploy them on your own. You also have to solve stability problems and set up many supporting modules and management tools, which require heavy investments in technology and take a long period of time.
    Resource utilizationThe service is billed by the actual usage and supports elastic scaling to ensure a high resource utilization.You have to consider traffic spikes, and the resource utilization is low.
    Data disaster recoveryPrimary/Replica replication and backup are configured by default. Both intra-region and cross-region disaster recovery schemes are supported, such as multi-AZ deployment and cross-region backup. You have to find the backup storage space and regularly verify whether backups can be restored, which cost more money and time.
    Control and management servicesComprehensive cloud-based instance lifecycle management capabilities are available for various objects, including monitoring and alarming, backup and restoration, instance, database, account, network, parameter, and log.You have to implement all control and management capabilities on your own.
    Procurement costsInstances are priced transparently and even more cost-effective than CVM.In addition to instances, you also have to set up disaster recovery, monitoring, and management systems on your own at totally uncontrollable costs.
    LicenseGenuine licenses from Microsoft continuously provide you with the latest features, eliminating your need to purchase additional licenses.Pirated services lead to legal risks, while genuine licenses are expensive.
    Ops costsTencent Cloud provides a professional team to guarantee the service quality for key accounts 24/7, eliminating your need to manually perform Ops.You have to hire dedicated DBAs for database maintenance, which incurs high labor costs.

    TencentDB for SQL Server's High Availability/Disaster Recovery Capabilities

    TencentDB for SQL Server provides disaster recovery capabilities at different levels, including instance, server, data center, AZ, and region, to ensure the business continuity on healthy systems with the minimum data loss in case of natural disasters, device failures, and maloperations. Backup is the basis of all disaster recovery systems and the last line of defense in the high data availability architecture. TencentDB for SQL Server features rich backup capabilities, ensuring that the data can be restored quickly even after a total system crash to guarantee the business continuity as much as possible.

    TencentDB for SQL Server provides instances in various architectures with guaranteed high availability:

    • A Dual-Server High Availability Edition instance is in the primary/replica dual-node architecture, where the underlying layer is deployed on a physical machine. It supports the database mirroring (high-availability replication) scheme to implement automatic HA switch within seconds.
    • A Cluster Edition instance is in the primary/replica dual-node architecture, where the underlying layer is deployed on a physical machine. It adopts the Always On technology to build a SQL Server cluster that features high performance, high availability, high reliability, and easy maintenance and implements automatic HA switch within seconds.
    • A Basic Edition instance is in the single-node architecture, where the underlying layer is deployed in a CVM instance, storage and computing are separated, and data is stored in three replicas in Premium Cloud Storage to avoid data loss. In extreme cases where an instance fails, a new instance will be started to automatically restore the data from data and log backups. The specific restoration time is subject to the data volume. The servers of two TencentDB instances are usually on the same physical machine.

    For intra-region disaster recovery, TencentDB for SQL Server provides multi-AZ deployment capabilities. Different AZs in the same region are interconnected over the private network, and failures can be isolated between AZs. For instances in the primary/replica dual-node architecture, the primary and replica instances can be deployed in different AZs in the same region (for example, one primary instance in the primary AZ and one replica instance in the replica AZ). This improves the business continuity and guarantees the data availability in case of instance failures or AZ disconnections. You can also manually switch between the primary and replica instances in the console to verify the business robustness. Switches within the same AZ and between different AZs are imperceptible to the application.

    For remote disaster recovery, cross-region backup capabilities are offered to store backup files in another region. You can set the cross-region backup retention period and multiple backup regions. After a cross-region backup policy is enabled, the instance backup files will be automatically stored in the target region. In this way, if an instance in a region fails, you can restore its backup files in the remote region to a new instance there for guaranteed business continuity. Cross-region backup implements the high availability of database restoration and meets the requirements for data availability and security, remote backup and restoration, remote disaster recovery, long-term data archive, and regulation compliance.

    In addition, TencentDB for SQL Server also has rich backup capabilities to guarantee the data security and prevent data loss or corruption. Specifically, you can configure automatic backup, manual backup, data backup, log backup, backup file format (unarchived files or archive file), instance backup, and multi-database backup. You can also customize the backup policy, backup retention period (7–1,830 days), and backup cycle.

    Moreover, TencentDB for SQL Server comes with comprehensive disaster recovery capabilities at both the data and business management layers. Cross-region disaster recovery for databases is meaningful only if the business also features cross-region disaster recovery. However, cross-region distributed deployment of the business inevitably causes the split-brain problem. At the business management layer, the business is deployed in three AZs (two intra-region AZs and one remote AZ) to ensure the business continuity. Before an actual failover occurs, the system will always check whether the database sync status (database sync system table) is normal to avoid faulty failover.

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