DAS
See Data Admin Service
Data Admin Service
Data Admin Service (DAS) enables you to manage DB instances on a web console, making your database management easy, efficient, and secure. It supports functions such as basic SQL operations, advanced database management, and intelligent SQL tuning, meeting your service requirements for daily R&D, database O&M, database management, and security.
data connection
A data connection is a collection of information required for accessing data storage (computing) space, including the connection type, name, and login information.
Data Control Language
Statement used for setting or modifying the permission of a database user or role.
Data Definition Language (MRS)
A language used to define the data structure and database objects in the HiveQL set. It consists of three types of syntax: CREATE, ALTER, and DROP. Derived from the Conference on Data Systems Languages (Codasyl) model, the DDL has become a subset of SQL.
Data disk image
A data disk image contains service data. It can be used to create EVS disks during ECS creation, or be used to create EVS disks that are attached to ECSs. Through data disk images, you can migrate your service data to the cloud.
Data Encryption Key
A DEK is used to encrypt users' data.
Data Encryption Workshop
Data encryption Workshop (DEW) is a full-stack data encryption service in the cloud. It covers Key Management Service (KMS), Key Pair Service (KPS), and Dedicated HSM. DEW uses hardware security modules (HSMs) to protect the security of your keys, and can be integrated with other services to meet even the most demanding scenarios.
Data Express Service
Data Express Service is a massive data transmission solution. It allows a large amount of data to be transmitted from physical storage media, including Teleports and hard disks (such as external USB flash drives, SATA disks, and SAS disks) to HUAWEI CLOUD.
Data Ingestion Service
Data Ingestion Service (DIS) addresses the challenge of transmitting data within the cloud and from outside the cloud to inside the cloud. With DIS, you can build custom applications to process or analyze streaming data for specific needs.
Data Lake Factory
DLF is a cloud service that provides one-stop Big Data development environment and has full-hosting Big Data scheduling capabilities. In the Big Data development environment, users can complete an entire data processing and analysis procedure from data modeling, data integration, script development, workflow orchestration, to O&M monitoring, greatly reducing the threshold for using Big Data.
Data Lake Insight Service
Data Lake Insight (DLI) is a serverless big data compute and analysis service that is fully compatible with Apache Spark and Apache Flink ecosystems and supports batch streaming. With multi-model engines, enterprises can use SQL statements or programs to easily complete batch processing, stream processing, in-memory computing, and machine learning of heterogeneous data sources.
Data Lake Visualization
Data Lake Visualization (DLV) is a one-stop data visualization platform that adapts to various data sources in the cloud or on-premises. By dragging and dropping 2D and 3D visual components on DLV, you can quickly customize and create a data screen of your own.
Data Manipulation Language (MRS)
An instruction set for accessing objects in databases. The core instructions in this set are INSERT, UPDATE, and DELETE, which respectively mean inserting, updating, and deleting. These instructions are indispensable for developing data-centered applications.
Data Manipulation Language (DLI)
An instruction set used for accessing data for database objects.
Data Plane Development Kit
A collection of development platforms and interfaces for quickly processing data packets. DPDK runs on Intel x86 platforms.
data record
A data record is the unit of data stored in a DIS stream. A data record is composed of a sequence number, partition key, and data blob. Data blobs are key data added by data producers to DIS streams. The payload of a data blob can be up to 1 MB before Base64 encoding.
data replication
In an HA architecture, data committed to a primary instance will be replicated to a standby instance. Data replications come in three types: fully synchronous replication, semi-synchronous replication, and asynchronous replication.
Data Replication Service
Data Replication Service (DRS) is a stable, efficient, and easy-to-use cloud service for database online migration and synchronization. It simplifies data transmission processes and reduces transmission costs.
data screen
A data screen serves as a dashboard generated to present data on DLV. It is also called a visualization project, visual application, or screen project. On this screen, data is converted to various charts or maps and presented to users in real time.
Data Warehouse (DLF)
A data warehouse is a collection of data that is topic oriented, integrated, and stable, and can reflect historical changes. It is used for management decision-making. A DIS data warehouse refers to a data warehouse on the Huawei cloud, such as DWS, DLI, and MRS Hive.
Data Warehouse (SAP HANA)
An integration center that stores a large amount of data. DWH is a core component of business intelligence (BI), which allows carriers to perform intelligent business analysis on users based on the massive user data stored in the data warehouse.
Database
A database is a collection of related data. Serving various applications, the data is structured and has no harmful or unnecessary redundancy. The data is stored separately from the relevant programs. You can use a common and controllable method to insert new data into the database in addition to modifying and searching the data in the database.
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 administrator account
A database administrator account is different from a user cloud account and used only within the RDS system to control access to RDS DB instances. You can use the database administrator account to access DB instances. For example, when you are creating a MySQL DB instance, the administrator account root is created by default and you can specify the root password. After the DB instance is created, you can connect to it using the root account. You can also create additional database accounts as needed.
database master password
A string that defines the password for the database master user. The database master password is a string of 8 to 32 characters. It must contain uppercase letters, lowercase letters, digits, and special characters. You can use the following special characters: ~!@#%^*-_=+?
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. Migration from on-premises databases to the cloud is common.
Database Security Service
The Database Security Service (DBSS) is a security service that protects databases on clouds. Based on the reverse proxy and machine learning technologies, it provides functions such as data masking, database auditing, sensitive data discovery, and injection attack prevention.
database storage
The underlying storage resources used for storing data and logs of a database permanently.
database synchronization
A process of establishing consistency among data from a source database to a target, automatically copying changes back and forth.
database type
Database types are classified into relational databases and non-relational databases.
database user
A user that accesses DDS. Currently, the default username is rwuser.
DataNode
DataNodes, usually one per node in the HDFS cluster, manage storage attached to the nodes that they run on.
Dataset
A dataset is sample data stored in an OBS bucket and used for training models. ModelArts can manage the versions of datasets and switch different versions in different scenarios.
DB
See Database
DB connections
The number of client sessions that are connected to a DB instance.
DB engine
A DB engine is vital for storing, processing, and protecting data. It can be used to control access permissions and process transactions rapidly. Each DB instance runs a DB engine.
DB instance
A DB instance is an isolated database environment in the cloud. It is a basic building block of RDS. A DB instance can contain multiple user-created databases. You can access your DB instance by using the same tools and applications that you use with a standalone DB instance.
DB instance class
The DB instance class determines the compute and memory capacity of a DB instance. You can change the CPU or memory of an available DB instance by changing its DB instance class.
DB instance ID
A DB instance ID uniquely identifies a DB instance in a region.
DB instance lifecycle
A DB instance lifecycle starts from the time when the DB instance is created to the time when the DB instance is deleted. During a DB instance lifecycle, you can back up and restore data, change instance classes, scale up storage space, and reboot or delete the instance.
DB parameter group
A database parameter group functions as a container for engine configuration values that can be applied to one or more DB instances. If users create a DB instance without specifying a DB parameter group, the default parameter group is used. The default parameter group contains the default values of the engine and database system optimized for the running DB instances. If users want their DB instances to run with their self-defined engine configuration values, they can simply create a new database parameter group, modify certain parameters, and associate the new DB parameter group to a DB instance. Once associated, all DB instances that use this particular DB parameter group get all the parameter updates to that DB parameter group.
DB parameter template
A database parameter template functions as a container for engine configuration values that can be applied to one or more DB instances. If you create a DB instance without specifying a parameter template, the default parameter template is used. Each default parameter template contains database engine defaults and RDS system defaults. You can also create your own parameter template where you choose your own parameter settings and apply the parameter template to DB instances. If you update parameters in a parameter template, the changes apply to all DB instances that are applied with the template.
DBA
See database administrator
DBSS
See Database Security Service
DCL
See Data Control Language
DDL (MRS)
See Data Definition Language (MRS)
DDM
See Distributed Database Middleware
DDM instance
A DDM instance is the minimum resource unit of DDM, which runs on an ECS. DDM instances currently support three types of specifications, including 8 vCPUs | 16 GB, 16 vCPUs | 32 GB, and 32 vCPUs | 64 GB. You can apply for suitable DDM instances according to service requirements.
DDoS attack
See distributed denial of service attack
DDS
See Document Database Service
Dedicated Computing Cluster
Dedicated Computing Cluster (DCC) provides dedicated, physically isolated computing resource pools on HUAWEI CLOUD, allowing you to use physical computing devices and resources exclusively.
Dedicated Host
A Dedicated Host (DeH) is a physical server fully dedicated for your own services. DeH allows you to ensure security and performance by keeping compute resources isolated.
DeH
See Dedicated Host
DEK
See Data Encryption Key
Delivery Method
Method of delivering Marketplace products, such as images, software as a service (SaaS), consulting services, licenses.
DES
See Data Express Service
Destination job configuration
During job creation, a destination link specifies the data source where the data is to be loaded, for example, a table or directory. The destination job parameter settings vary with destination links. You can set related parameters in the destination job configuration.
Destination server
A destination server refers to the destination server to which a source server is migrated in a server migration task. In SMS, a destination server is an ECS on HUAWEI CLOUD.
Detaching a replication pair from a protected instance
Indicates to detach the two disks in a replication pair from the two servers in a protected instance.
detection based on semantic analysis
A syntax tree is built based on the semantic context to determine whether a load is an attack load.
DEV
See Development
Development
A HANA development scenario where development engineers configure and verify the compatibility between application software and SAP HANA and continuously optimize the application software.
Development Environment
A development environment is an editor required for developing AI training jobs.
DEW
See Data Encryption Workshop
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.
DIS
See Data Ingestion Service
Disabling protection
Can be performed after the data synchronization is complete. Once the protection is disabled, the data synchronization stops, and the protection status of the protection group changes to Stopped.
Disaster Recovery
The recovery of data, access to data and associated processing through a comprehensive process of setting up a redundant site (equipment and work space) with recovery of operational data to continue business operations after a loss of use of all or part of a data center. This involves not only an essential set of data but also an essential set of all the hardware and software to continue processing of that data and business. Any disaster recovery may involve some amount of down time.
Distributed Consensus
A majority of independent participants in a system need to achieve consensus on a transaction or operation, for example, verification of double-spending transactions, verification of transaction validity, and the decision on whether to write verified data to the existing ledger.
Distributed Database Middleware
Distributed Database Middleware (DDM) is designed to solve distributed expansion issues of databases. It breaks the capacity and performance bottlenecks of traditional databases to achieve high concurrent access to mass data.DDM uses the Huawei Relational Database Service (RDS) as the storage engine and provides full-lifecycle O&M management capabilities, such as automatic deployment, sharding, flexible scaling, and high availability.
distributed denial of service attack
A denial-of-service (DoS) attack (a flood attack) is an attempt to use up the network or system resources of a computer to temporarily interrupt or stop services on the computer, thereby causing users unable to access the services normally. A DDoS attack is one in which two or more compromised computers are used to attack a single target, thereby causing denial of service for users of the targeted computer.
Distributed Ledger
A distributed ledger is a database shared, replicated, and synchronized among network participants. It records transactions such as exchange of assets and data between network participants. Use of a distributed ledger eliminates the need for reconciliation, saving time and costs.
Distributed Message Service
Distributed Message Service (DMS) is a reliable, scalable, fully managed message queuing service that provides concurrent access at scale using the distributed, highly available cluster technology. DMS decouples components of a cloud application, delivering substantial cost benefits.
Distributed Message Service for Kafka
Distributed Message Service (DMS) for Kafka is a message queuing service based on Apache Kafka. This service provides Kafka premium instances. The computing, storage, and bandwidth resources used by an instance are exclusively occupied by the user. You can apply for instances as required and customize partitions and replicas for the topics in the instances. The instances can be used right out of the box, taking off the deployment and O&M pressure for you so that you can focus on developing your services.
Distributed Message Service for RabbitMQ
Distributed Message Service (DMS) for Kafka is a message queuing service based on Apache Kafka. This service provides Kafka premium instances. The compute, storage, and bandwidth resources used by your instances are exclusively occupied by you. You can apply for instances as required and customize partitions and replicas for the topics in the instances. The instances can be used right out of the box, taking off the deployment and O&M pressure for you so that you can focus on developing your services.
DLF
See Data Lake Factory
DLI
See Data Lake Insight Service
DLI Table
Table that stores data of DLI.
DLV
See Data Lake Visualization
DML (MRS)
See Data Manipulation Language (MRS)
DML (DLI)
See Data Manipulation Language (DLI)
DMS
See Distributed Message Service
DMS for Kafka
See Distributed Message Service for Kafka
DMS for RabbitMQ
See Distributed Message Service for RabbitMQ
DN (MRS)
See DataNode
DNS
See domain name server
DN (VSS)
See Domain Name
document
An entity for Elasticsearch storage. Equivalent to the row in the RDB, the document is the basic unit that can be indexed.
Document Database Service
DDS is a database service compatible with the MongoDB protocol and is secure, highly available, reliable, scalable, and easy to use. It provides DB instance creation, scaling, redundancy, backup, restoration, monitoring, and alarm reporting functions with just a few clicks on the DDS console.
document type
Similar to the table in the RDB, the document type is used to distinguish between different data. One index can contain multiple document types. A document actually must be indexed to a document type inside an index.
Domain Name
Domain names refer to the names that are registered to domain name registrars by individuals or organizations, such as enterprises, governments, or non-governmental organizations. Domain names serve as the network addresses for the communication between enterprises or organizations on the Internet. Each domain name corresponds to an IP address.
domain name server
A domain name server (DNS) is a functional entity in the TCP/IP network. With deployment of the DNS, subscribers can access related servers using corresponding domain names. In the TCP/IP network, a domain name maps an IP address. Domain names are easier to remember but servers in the network communicate with each other using IP addresses. Therefore the DNS is used to convert domain names to corresponding IP addresses.
Domain Verification
Users' identity and other relevant information are verified.
DR
See Disaster Recovery
DR direction
Indicates the data replication direction. The data replication is from the source AZ to the target AZ when users create a protection group. After users perform a planned failover, the data replication is from the target AZ to the source AZ.
DR drill
Is to verify that a target server can take over services from a source server once a failover is performed.
DR site
A DR site is the data center that does not carry services when the production site works properly. It is used to back up data in real time. When the production site fails (planned or unexpected), the DR site can take over the services after a failover. It can reside in the same city as the service management center or in another city.
Driving License OCR
Driving License OCR automatically recognizes all information on the original page of driving licenses, and accurately extracts structured information such as name, gender, issue date, driving class, and validity period under complex conditions such as dark light, tilt, overexposure, anti-counterfeit watermarks, and shadow.
DRS
See Data Replication Service
DWH
See Data Warehouse (SAP HANA)