Opinions expressed here are those of the poster and do not necessarily reflect the views of the company. But if you are going to make use of dataSourceName , you will probably want to ensure that all pooled DataSources within your JVM do have unique names. If true, and if unreturnedConnectionTimeout is set to a positive value, then the pool will capture the stack trace via an Exception of all Connection checkouts, and the stack traces will be printed when unreturned checked-out Connections timeout. Please see Configuring DefaultConnectionTester. If you would the test to timeout and fail, set the following key. Do whatever you want with your DataSource, which will be backed by a Connection pool set up with default parameters. Type 3 drivers basically proxy or relay the request to another network resource.
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PostgreSQL JDBC Download
This property now defaults to trueand logger names are logged in place of class names. If you are letting a single, shared Connection serve many clients jbc3 avoid Connection acquisition overhead, you may suffer performance issues mdbc4 problems managing transactions when your Connection is under concurrent load; Connection pooling will enable you to switch to a one Connection-per-client model with little or no cost.
Email Required, but never shown. Both the idle test and the check-in test are performed asynchronously, which can lead to better performance, both perceived and actual.
Occasionally it is useful to override the default values of standard Connection properties such as transactionIsolationholdabilityor readOnly.
Whenever an unreturned Connection times out, that stack trace will be printed, revealing where a Connection was checked out ve was not checked in promptly. Determines which library c3p0 will output log messages to.
SQL exception handling enhancements: Setting this jvbc3 to true causes c3p0 to ignore DriverManager and simply instantiate driverClass directly.
The data in the Blob and Clob can be altered: You will find that c3p0 registers MBeans under the domain com. Looking for advice in using c3p0 with hibernate? Enhanced performance is the purpose of Connection and Statement pooling, and a major goal of the c3p0 library.
A Connection older than maxConnectionAge will jdbbc3 destroyed and purged from the pool. The following example uses the JDBC 4.
The new features availble in J2SE 1. Jdc3 is a pretty robust setting, all Connections will tested on check-in and every 30 seconds thereafter while in the pool.
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Type 3 drivers basically proxy or relay the jdhc3 to another network resource. As always, finalization should be considered a backstop and not a prompt or sure approach to resource cleanup. If you jdbcc4 the test to timeout and fail, set the following key com.
To define per-user configurations For information about how to create an internal connection from Java classes running inside the database server, see Establishing a connection from a server-side JDBC class.
Also, setting an automaticTestTable or preferredTestQuery will usually speed up all connection tests. The format of c3p0. But when it has no user-determined query va run to test a Connection, it’s less clear what c3p0 should do. The number of Jdvc3 increases whenever a Connection is requested by a user, no Connections are available, and the pool has not yet reached maxPoolSize in the number of Connections managed.
Follow this question By Email: Programmatic configuration via PoolConfig If you use the DataSources factory class, and you want to programmatically override default configuration parameters, make use of the PoolConfig class: Also, feel free to join and ask questions on the c3p0-users mailing list.
c3p0-v – JDBC3 Connection and Statement Pooling – Documentation
The old jboss config mbeans are deprecated, but will still work. Most applications should work quite reliably using a combination of idleConnectionTestPeriod and testConnectionOnCheckin. Since Jfbc4 acquisition is very slow, it is almost always useful to increase the number of Connections eagerly, in batches, rather than forcing each client to wait for a new Connection to provoke a single acquisition when the load is increasing. Depending on your database, this may execute more slowly than a “normal” database query.
If, however, some of these tasks “hang”, that is they neither succeed nor fail with an Exception for a prolonged period of time, c3p0’s thread pool can become exhausted and administrative tasks backed up.
The point of Connection pooling is to bear the cost of acquiring a Connection only once, and then to reuse the Connection many, many times. You can directly alter the property values associated with a particular DataSource in your code, or you can configure c3p0 externally