A-E
Backup Storage
Backup storage is the underlying storage resource used to persistently store backups such as database data or logs.
Read/Write Splitting
It enables the master database to handle transactional INSERT, UPDATE, and DELETE operations, while the read-only Instance handles SELECT queries.
F-J
High Reliability
This term typically describes a system that is specifically designed to minimize downtime and maintain a high level of service availability.
Relational Database
A relational database is a database that is organized and linked according to a relational schema. The relational database model reduces complex data structures to simple binary relations, represented as two-dimensional tables. In a relational database, data operations are almost entirely based on one or more relational tables. Database management is achieved by performing operations such as classifying, merging, joining, or selecting these related tables. Common relational databases include: Oracle Database, MySQL Database, MariaDB Database, SQL Server Database, Access Database, DB2, PostgreSQL, Informix, Sybase, and others.
K-O
Logical Backup
A logical backup is the process of extracting data from a database using SQL and storing it in a binary file. It refers to using software technology to export data from a database and write it to an output file. The format of this file typically differs from the original database's file format, serving only as an image of the data content from the original database. Consequently, a logical backup file can only be used for logical recovery of the database, meaning data import, and cannot perform physical recovery based on the original storage characteristics of the database. Logical backups are generally used for incremental backups, which back up data that has changed since the last backup.
Cold Backup
A cold backup is performed while the system is shut down or in maintenance mode. In this scenario, the backed-up data is completely consistent with the data in the system during that period.
P-T
QPS
Queries Per Second (QPS) is a metric that measures the amount of traffic processed by a specific query server within a specified time period.
Hot Backup
A hot backup is performed while the system is operating normally. In this scenario, because data in the system may be updated at any time, the backed-up data may have some lag relative to the system's real-time data.
Data Replication
Data is replicated from the Master to the Slave. Replication methods include strong synchronous replication, semi-synchronous replication, and asynchronous replication.
Database Storage
Database storage is the underlying storage resource used to persistently store database data and logs.
Database Administrator
A Database Administrator (DBA) is a person responsible for database management. A DBA uses specialized software to store and organize data. This role may include capacity planning, installation, configuration, database design, migration, performance monitoring, security, troubleshooting, as well as backup and data recovery.
Database Connections
Database connections refer to the number of client sessions connected to a database instance.
Database Migration
As business evolves, databases also need to be migrated from one environment to another along with the applications, for example, from an on-premises IDC to the cloud, or from one cloud to another.
Database Instance
A database instance is an independent database environment running in the cloud. It is the fundamental building block of TencentDB. An instance can contain multiple databases and can be accessed using the same client tools and applications as a standalone database instance.
Database Engine
A database engine is a core service used for storing, processing, and protecting data. It enables control over access permissions and rapid transaction processing, thereby meeting the requirements of most applications within an enterprise that need to handle large volumes of data. Every database instance supports a database engine.
U-Z
Physical Backup
A physical backup is a backup process that copies the actual operating system files that constitute a database from one location to another, typically from disk to tape. Physical backups are further categorized into cold backups and hot backups.