We closed the connection at , , , and iterations. The total elapsed time for each run was measured when connection pooling was used and was measured again when connection pooling was not used as shown in the following table:. When connection pooling was used, the first connection took the longest time because a new physical connection had to be created and the pool manager had to be initialized.
Once the connection existed, the physical connection was placed in the pool and was reused to create a handle for each subsequent connection. You can see this by comparing the first connection the first iterations with its subsequent connections. NOTE: In our connection pooling example, all subsequent connections were reused because they were used for the same user and pool cleanup had not occurred.
Now, compare the pooling results at each iteration checkpoint to the non-pooling results. Clearly, connection pooling represents a significant improvement in performance.
Connection pooling provides a significant improvement on performance by reusing connections rather than creating a new connection for each connection request, without requiring changes in your JDBC application code. Note that the time for the iteration pooled case is faster than the iteration pooled case.
If the JIT compiler is disabled, the time for the iteration pooled case increases to 94 ms, while the time for the other pooled cases remains the same. Get Customer Support. Services By Product By Type. Search Search. NET OData. Contact Us. Back to top. Figure 1. JDBC 3. This interface provides hooks that third-party vendors can use to implement pooling as a layer on top of their JDBC drivers.
This interface allows third-party vendors to implement pooling on top of their JDBC drivers. A PooledConnection object acts as a "factory" that creates Connection objects. A PooledConnection object maintains the physical connection to the database; the Connection object created by the PooledConnection object is simply a handle to the physical connection.
This interface is the entry point that allows interaction with their pooling module. The shrinking only closes unused connections. The value is a number in units of minutes.
The name value can be a string up to characters. The table must exist and be accessible to the database user for the connection. The value for the interval is a number in units of minutes. At the specified interval, each unused connection in the pool is tested by executing an SQL query on the connection.
If the test fails, the connection's resources are dropped and a new connection is created to replace it. If all connections in a pool are in use and a client is waiting for a connection, the client will wait longer while the connection is tested.
This string of asterisks is a placeholder for the password. When tmloadcf encounters this string of asterisks, it prompts the user to select a password.
For example:. Instead, the tmloadcf command uploads the encrypted password back into the system. Use of encrypted passwords is only recommended for production environments.
Clear-text passwords can be used during application development. You can use the tmadmin printjdbcconnpool command to report statistics on JDBC connection pools. The data includes the maximum number of connections per pool, the number of connections in use, the number of clients waiting for a connection, and the high-water mark HWM or highest number of connections used for a pool.
Listing shows the output produced by running the printjdbcconnpool command in terse and verbose modes. In terse mode the maximum pool size, the current pool size, and the number of connections currently in use are shown. In verbose mode the number of clients waiting and the high-water mark are also shown. For example if the high-water mark HWM of connections in use is at or close to the maximum size, or connections in use is close to the maximum size and clients are waiting for connections, then you may want to expand the maximum size of the pool.
To do this, you must:. Shut down the WebLogic Enterprise application with the tmshutdown command. Use the tmboot -y command to restart the application. Note: Currently, the WebLogic Enterprise software does not support runtime changes to connection pools in running applications. The properties defined in these classes are read by the WebLogic Enterprise Java server infrastructure at boot time to determine the defined behavior of the application, including the behavior of any connection pools.
This document has been updated and is included in the WebLogic Enterprise online documentation. The JDBC 2. In the JDBC 2. DataSource java. However, for a JDBC 1. Reference javax. For JDBC 1. Therefore, from the connection pooling module's perspective, it interacts with all drivers with the JDBC 2. Collectives on Stack Overflow. Learn more.
How to use connection pool in jdbc with oracle database? Ask Question. Asked 10 years, 4 months ago. Active 10 years, 4 months ago. Viewed 16k times. MemoryLeak MemoryLeak 7, 22 22 gold badges 82 82 silver badges bronze badges. How about reading the documentation: commons. Interesting choice of profile name.
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