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Why to use database connection pool and what the benefits are, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can get something.

For a simple [database] application, the access to the database is not very frequent. At this point, you can simply create a new connection when you need to access the database and close it when you are done, with no significant performance overhead.

But for a complex database application, the situation is completely different. Frequently establishing and closing connections will greatly reduce the performance of the system, because the use of connections has become the bottleneck of system performance.

Connection multiplexing. By establishing a database connection pool and a set of connection usage management strategy, a database connection can be reused efficiently and safely, and the overhead of frequent establishment and closure of database connection can be avoided.

For shared resources, there is a famous design pattern: resource pooling. The purpose of this model is to solve the problems caused by frequent allocation and release of resources. The application of this pattern to the field of database connection management is to establish a database connection pool to provide a set of efficient connection allocation and use strategy, and the ultimate goal is to achieve efficient and secure connection reuse.

The basic principle of database connection pool is to maintain a certain number of database connections in the internal object pool and expose the methods of obtaining and returning database connections. Such as:

External users can obtain the connection through the getConnection method, and then return the connection through the releaseConnection method after use. Note that the connection is not closed at this time, but is reclaimed by the connection pool manager and ready for next use.

Advantages of database connection pooling technology:

1. Resource reuse

Because database connections are reused, a lot of performance overhead caused by frequent creation and release of connections is avoided. On the basis of reducing system consumption, on the other hand, it also improves the stability of the system running environment (reducing memory fragmentation and the number of temporary processes / threads in the database).

2. Faster system response

Database connection pool in the initialization process, often has created a number of database connections in the pool standby. At this point, the initialization of the connection is complete. For business request processing, the existing available connections are directly used to avoid the time overhead of database connection initialization and release process, thus reducing the overall response time of the system.

3. New means of resource allocation

For systems in which multiple applications share the same database, database connection pooling technology can be realized through the configuration of database connections in the application layer. Several years' money may be a new topic. For the current business system, if the application of connection pooling has not been taken into account in the design, then. . Add this part to the design document. The limit of the maximum number of available database connections for an application to prevent an application from monopolizing all database resources.

4. Unified connection management to avoid database connection leakage

In the relatively complete implementation of database connection pool, the occupied connection can be forcibly withdrawn according to the pre-set connection occupation timeout. As a result, the resource leakage that may occur in the conventional database connection operation is avoided.

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