web信息系統(tǒng)中英文資料外文翻譯文獻(xiàn)(編輯修改稿)
2025-01-11 12:40 本頁面
【文章內(nèi)容簡(jiǎn)介】 st only the connect / disconnect with a small portion of the overhead to establish the connection of the buffer pool, the rest of the connect / disconnectoverhead is not big, because this is only reuse the existing connection. Serv the let in the following manner using the connection pool: When a user through Request Web Serv the let the let Serv use an existing connection from the buffer pool Next, this means that the user requests do not cause the connection to the databasesystem overhead. In After the termination of serv the let it connect to return to the pool for its Connection Manager The Ser vlet. Thus, the user request does not cause the database is disconnected Of system overhead. Connection Manager also allows users to be able to control the concurrency of thedatabase products even Then the number. When the database license agreement limit the number of users, this feature is Very useful. Create a buffer pool for the database, and connection management Buffering pool maximum number of connections parameter set to the database product license limit Given maximum number of users. If you use other programs without Connection Managerconnections Database, you can not guarantee that the method is effective. (2) the structure of the Connection Manager. (3) Connection Manager connection pool to maintain a connection to a specific database is open. Step 1: When the first Serv the let trying to Connection Manager munications is loaded by the Java Application Server Connection Manager. As long as the Java application server running the Connection Manager has been loaded. Step 2: The Java application server passes the request to a servlet. Step 3: Servlet Connection Manager requests a connection from the pool. Step four: the buffer pool to Ser vlet allocated a pool of existing idle connection. Step 5: servlet to use to connect a direct dialogue with the database, this process is the standard API for a particular database. Step 6: the database through Ser vlet the connection returns data. Step 7: When the Servlet end to municate with the database, servlet connections returned to the connection manager pool for other servlet uses. Step 8: Servlet Jav a application server to the user sends back requests a connection, if the buffer pool, there is no idle connection, then the connection manager directly municate with the database. Connection Manager will: Step 9: to the database requests a new connection. Step 10: Add connections to the buffer pool. If the buffer pool is connected to the prescribed ceiling, connect to the server Will not be a new connection to join the buffer pool (3) the performance characteristics of the Connection Manager. Buffer pool to create a new connection is a high overhead tasks, new connections will use the resources on the database. Therefore, the Connection Manager the best use of existing connections of the buffer pool to meet the request of the Servlet. Meanwhile, the connecting tube The processor must be as much as possible to minimize the buffer pool idle connections, because this is a great waste of system resources. Connection Manager Serv the let with the implementation of these minimize and maximize task. Connection Manager to maintain each connection verification time stamp, and recently used tags and use the logo. When the a Ser vlet first the connection, connection verification time stamp, and most recent time stamp is set to the current time, the connection is being used flag is set to Manager can be removed from a Serv the let a longunused connections, this length of time specified by the Connection Manager, the l
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