- A distributed database stores information on multiple connected nodes.
- Main types: homogeneous, heterogeneous, replicated, partitioned and hybrid.
- They offer scalability, higher availability, and lower latency, but require planning.
- They are used in Big Data, Blockchain, and companies with decentralized operations.
Databases are fundamental to information storage and management. With the evolution of technology and the increasing demand for accessibility and speed, distributed databases emerged, an effective solution for managing large volumes of data in a decentralized manner. To better understand this concept and how it works, it's helpful to know: What are databases and what are they for?.
This article explores in depth what distributed databases are, their characteristics, advantages, disadvantages, architectural models, and use cases. In addition, the principles of consistency and replication systems, essential elements to ensure data integrity in distributed environments.
What is a distributed database?
A distributed database It is an information storage system in which data is not stored on a single centralized server, but on multiple nodes connected within a network. Despite being physically distributed, these nodes function as a single logical database from the user's perspective. For a more detailed understanding, it is recommended to review What are non-relational databases?.
This type of database is characterized by guaranteeing the node autonomy, data replication and the ability to access regardless of the user's location. Thanks to its architecture, it allows for a effective scalability and improve the availability and the performance in massive operations.
Main characteristics of distributed databases
- Node autonomy: Each database node has a certain degree of independence, being able to manage its own local operations.
- Connectivity: The nodes are connected by networks that guarantee the flow of data.
- Fragmentation: The information is divided and stored in different nodes according to criteria that optimize access.
- Replication: Some data may be duplicated across multiple nodes to improve availability and reliability.
- Location Transparency: The user does not need to know which specific node the information is stored on.
To understand the importance of connectivity and how data is managed, it is advisable to know the Von Neumann architecture, which is relevant in the context of databases.
Types of distributed databases
Distributed databases can be classified according to their homogeneity and the distribution scheme of the data:
- Homogeneous: All databases use the same software and follow the same data model.
- Heterogeneous: Each node can run different database systems and architectures.
- Replicated: Each node stores a complete copy of the data.
- Partitioned: The data is divided into fragments and each part is stored on a different node.
- Hybrids: They combine replication and partitioning strategies.
Advantages and disadvantages of distributed databases
Advantages
- Scalability: New nodes can be added without affecting performance.
- Reliability: By distributing information, the risk of data loss due to single node failure is minimized.
- Latency reduction: Data can be stored on nodes close to end users.
- Higher availability: If one node fails, others can continue to function.
In addition to the advantages mentioned, it is interesting to explore types of relational and NoSQL databases which may also be relevant in this context.
Disadvantages
- Complexity: Managing and synchronizing nodes requires more planning.
- Security issues: Information distributed across multiple nodes requires advanced protection strategies.
- Costs: Implementing and maintaining this type of database can require a considerable investment.
Distributed database architecture
There are different architectural approaches that determine how data is managed in a distributed database:
- Client-server: A central node manages the database and clients access it through queries.
- Peer-to-peer: All nodes have the same hierarchy and can act as clients or servers.
- Mixed: Features of the two previous models are combined.
To understand how this architecture relates to scalability, see What is scalability?.
Main applications of distributed databases
Distributed databases are used in multiple sectors, including:
- Big Data: Efficient management of large volumes of data in real time.
- Blockchain: Decentralized storage to ensure integrity and security.
- Global companies: Use in multinational organizations with multiple locations.
- Cloud services: Optimizing cloud infrastructure for scalable applications.
Distributed databases represent an innovative solution for companies and organizations that require efficiency, availability y Scalability in managing your information. Although their implementation entails certain challenges, their numerous advantages make them a key option in the modern data storage space.
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