Learn about TiFlash caching technology

With the rapid development of technologies such as big data and cloud computing, data storage has become increasingly important to enterprises. Therefore, efficient data storage and processing technology has become one of the core technologies urgently needed by enterprises today. TiFlash caching technology is one of the efficient data storage and processing technologies. In this article, we will understand the working principle and advantages of TiFlash caching technology.

1. Introduction to TiFlash

Currently, enterprises are facing increasingly huge demands for data storage and processing. Traditional database technology is no longer capable of this task, which has also prompted the TiDB (distributed NewSQL database) ) was born. TiDB is a distributed database system with horizontal scalability and high availability that can store and process massive amounts of data. TiFlash is a distributed column storage computing engine affiliated with TiDB. It is an efficient data caching technology that can effectively reduce query time and improve query performance.

The main function of TiFlash is to optimize query efficiency. By caching data on compute nodes, delays in disk IO operations are avoided, resulting in faster query times. Since TiFlash uses a columnar storage structure, it has also greatly improved storage efficiency. In addition, TiFlash also has excellent scalability and high availability, which can meet the growing data storage and processing needs of enterprises.

2. TiFlash working principle

TiFlash improves data query efficiency by combining caching and calculation. In TiFlash, the data query process mainly includes the following steps:

1. TiDB sends a SQL request to TiKV, and TiKV processes the data and returns the results.
2. If the data is not cached in TiKV, the data needs to be read from the disk, and this process will cause a certain IO delay.
3. When TiKV queries the results, it will first determine whether the queried data has been cached in TiFlash. If the data is not cached, TiKV sends the corresponding data to the TiFlash node.
4. The TiFlash node will cache the received data into the memory. If the memory cache reaches the upper limit, the cached data can be cleared through the Tidb-ctl control tool.
5. The process of TiFlash querying data is divided into two steps. First, it queries the memory data. If the memory data is insufficient, it will query the disk data.

Through these steps, TiFlash can effectively improve query speed and performance. Because TiFlash uses memory to cache data, it can avoid disk IO delays, and the column storage structure used by TiFlash can also significantly improve data storage efficiency.

3. TiFlash Advantages

1. High Availability

TiFlash can transfer data between multiple computing nodes through a distributed architecture backup and exchange to achieve high availability. Even if a node fails during operation, TiFlash can automatically migrate the data cache from the failed node to an available node, thus ensuring the stability and continuity of data queries.

2. Cost Savings

TiFlash caches data on the computing nodes based on the separation of physical storage and computing nodes, avoiding disk IO operations. latency, thereby improving query speed and performance. At the same time, TiFlash adopts a column storage structure, which can greatly reduce the cost of storing data. Therefore, using TiFlash caching technology can not only improve data processing efficiency, but also reduce enterprise costs.

3. Scalability

As enterprise data storage needs continue to grow, TiFlash can quickly expand to support more computing and storage nodes, thereby achieving horizontal Extension. TiFlash ensures high data availability through data backup and exchange between multiple computing nodes. Therefore, when large amounts of data need to be processed, TiFlash nodes can be added very easily to achieve rapid system expansion.

4. Superior Performance

TiFlash adopts columnar storage structure and caching technology, which can greatly improve query performance and efficiency. In large-scale data storage and processing scenarios, TiFlash can avoid delays in disk IO operations, thereby greatly improving query speed and performance. In addition, TiFlash's high availability and data backup mechanism will also greatly reduce the risk of system failure.

In general, TiFlash is an efficient data caching technology that can improve data query efficiency and performance, and is suitable for large-scale data storage and processing scenarios in enterprises. At the same time, TiFlash also has the advantages of cost saving, high availability and scalability, which can meet the growing data storage and processing needs of enterprises.

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