Oracle Connection Pooling Guide

In Oracle, connection pooling and reuse can be achieved by following these steps:

1. First, create a connection pool in Oracle database. You can use Oracle’s PL/SQL package DBMS_CONNECTION_POOL to create a connection pool. For example, you can create a connection pool named MY_CONNECTION_POOL with the following statement.

EXEC DBMS_CONNECTION_POOL.CREATE_POOL(pool_name => 'MY_CONNECTION_POOL', maxsize => 10, minsize => 2, incrsize => 1, session_state => 'ACTIVATED');

1. Next, utilize a connection pool within the application to obtain a database connection. This can be achieved by calling DBMS_CONNECTION_POOL.ACQUIRE_CONNECTION to retrieve a connection from the pool. For example, one can obtain a connection using the following statement:

DECLARE
   conn UTL_TCP.connection;
BEGIN
   conn := DBMS_CONNECTION_POOL.ACQUIRE_CONNECTION(pool_name => 'MY_CONNECTION_POOL');
END;

1. After using a connection in the application, it should be released so that it can be reused. The connection can be released by calling DBMS_CONNECTION_POOL.RELEASE_CONNECTION. For example, you can release the connection using the following statement:

DECLARE
   conn UTL_TCP.connection;
BEGIN
   conn := DBMS_CONNECTION_POOL.ACQUIRE_CONNECTION(pool_name => 'MY_CONNECTION_POOL');
   
   -- 使用连接
   ...
   
   DBMS_CONNECTION_POOL.RELEASE_CONNECTION(conn);
END;

By following these steps, connection pooling and reuse can be implemented in Oracle, thereby improving the performance and scalability of the application.