[[Database History]]
[[RDBMS]] - Relational Models
[[Hadoop]]
##### **Big Data Challenges**
Examples of tasks that are hard with large datasets:
1. Count the **most frequent words** in Wikipedia.
2. Find the **hottest November** per country from weather data.
3. Find the **day with most critical errors** in company logs.

These problems require:
- **Huge data**
- **Efficient distributed computing**

#### [[RDBMS]] vs. [[Hadoop]]

| **Feature**    | **RDBMS**           | **Hadoop**                    |
| -------------- | ------------------- | ----------------------------- |
| Data structure | Structured (tables) | Any (structured/unstructured) |
| Scalability    | Limited             | Highly scalable               |
| Speed          | Fast (small data)   | Designed for huge data        |
| Access         | SQL                 | Code (e.g., Java, Python)     |