Help Center> >Glossary


    • C
      cloud database

      Service-oriented database services such as Relational Database Service (RDS) and Document Database Service (DDS) provided by cloud service providers.

      cloud service provider

      A company or an organization that provides cloud computing services.


      See cloud service provider

    • D
      data definition language

      A language used to define the data structure, especially database schema. It consists of three primary commands: CREATE, ALTER, and DROP.

      Data Replication Service

      A stable, efficient, and easy-to-use cloud service for database online migration and synchronization. It simplifies data transmission processes and reduces transmission costs.

      database administrator

      A person who is responsible for managing databases. A DBA uses dedicated software to store and organize data. Their responsibilities include but are not limited to capacity planning, installation, configuration, database design, migration, performance monitoring, security, troubleshooting, and data backup and restoration.

      database migration

      Database operation and maintenance (O&M) activities aiming to change the database platform, including migration to a new server or a new DB engine. A common scenario is that a cloud user's local database is migrated to RDS in the cloud.

      database synchronization

      A process of establishing consistency among data from a source database to a target, automatically copying changes back and forth. Database synchronization can be categorized as unidirectional, bi-directional, peer-to-peer, broadcast, consolidation, and cascading synchronization.


      See database administrator


      See data definition language

      Direct Connect

      A service that allows users to establish a high-speed, stable, secure, and dedicated network connection from data centers to the public cloud. It enables users to take full advantage of strengths of public cloud services while continue to use existing IT facilities, establishing a scalable and hybrid cloud computing environment.


      See Data Replication Service

    • E

      See elastic IP address

      elastic IP address

      An elastic IP address (EIP) can be bound to any ECSs in your account rather than a specified ECS. Different from a static IP address, when an ECS or its AZ is unavailable, its EIP can quickly redirect to the Internet IP address of any ECS in your account.


      • F
        fault retry

        If a migration task fails, users can troubleshoot the issues and retry the migration task. In full migration, this function can reset and restart the full migration process. In incremental migration, this function can attempt to restore the synchronization between the source and target databases.

        full data migration

        All data is migrated from a source database to a target during the database running process. If any changes occur on the source database during or after the migration, such as new data inserted to the source database, the changes will not be synchronized to the target database.

      • I

        See Internet Data Center

        incremental data migration

        Includes full migration by default. After full migration initializes the target database, incremental migration collects and analyzes logs to establish data consistency between the source and target databases, minimizing downtime.

        Internet Data Center

        The telecommunications sector uses available Internet communication lines and bandwidth resources to establish a standard and carrier-class equipment environment in which comprehensive services such as server hosting, renting, and other value-added services are provided for enterprises and governments.


        • M
          migration comparison

          Comparison of migration items between source and target databases, facilitating cloud users making decisions.

          migration logs

          Logs generated during database migration, which can be classified into the following levels: alarm, error, and info.

          migration pre-check

          Before a migration, DRS pre-checks migration items and generates results to ensure that all check items are successful, improving the migration success rate.

          migration progress

          Migration progress includes: Progress of an on-going full migration in percentage Synchronization latency between source and target databases of an on-going incremental migration

        • N
          non-system database

          Databases excluding system databases. For example, a user-built database is a non-system database.

        • O
          Offline database migration

          Static migration at one time after services are interrupted.

          on-premise database

          Self-built local databases on the premises.

          Online database migration

          Database migration without service interruption (or with service interruption at the minute level).


          • P
            public network

            A computer accesses the Internet through a public network. The IP address is not reserved on the Internet and can be used by the computer to communicate with other computers on the Internet.

          • S
            schema migration

            All structure object definition syntax, excluding database data, is migrated from a source database to a target.

            system database

            Stores system-level information used for database system running. It is created by default during the database system installation. For example, Microsoft SQL Server system databases include master, model, msdb, resource, and tempdb. MySQL system databases include information_schema, mysql, performance_shcema, sakila, and world.


            • U-Z
              Virtual Private Cloud

              A Virtual Private Cloud (VPC) is a secure, isolated, and logical network environment. You can create virtual networks in a VPC. The virtual networks provide the same network functions as those provided by a physical network, as well as providing advanced network services, such as elastic IP addresses and security groups.

              virtual private network

              The virtual private network (VPN) service establishes an encrypted communication tunnel between a remote user and a VPC, thereby enabling the remote user to use service resources in the VPC.


              See Virtual Private Cloud


              See virtual private network