The question has been closed for the following reason “Question is off-topic or not relevant” by Mark Culp 19 Feb ’13, Not all configuration parameters support per-user overrides. Ishan Bhatt 1 11 If automaticTestTable is provided, c3p0 will generate its own test query, therefore any preferredTestQuery set will be ignored. For example, using ComboPooledDataSource:. SybDriver to connect to Sybase. But in theory, one VM might look up two different DataSources, generated by two different VMs, that by unlikely coincidence have the same “identity token”, leading to errors as one of the two DataSources sneakily substitutes for the second.

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Configuration values set in system properties. Forcing authentication information, regardless of mis configuration of the jvbc4 unpooled DataSource You can wrap jdcb3 DataSouce using DataSource. Setting preferredTestQuery will lead to errors as Connection tests fail if the query target table does not exist in your database prior to initialization of your DataSource.

Simple advice on Connection testing If you don’t know what to do, try this: Setting a fairly long idleConnectionTestPeriodand not testing on checkout and check-in at all is an excellent, high-performance approach. If this value is less than or equal to zero, c3p0 will keep trying to fetch a Connection indefinitely.

Timer threadsand does so lazily in response to the first client request experienced by jdvc3 PooledDataSource. Regardless of acquireIncrementthe pool will never allow maxPoolSize to be exceeded. The new implementation should be significantly better than the “traditional” Connection acquisition strategy, but was added too late in the c3p DataSources are usually configured before they are used, either during or immediately following their construction.


Most jbc4 should work quite reliably using a combination of idleConnectionTestPeriod and testConnectionOnCheckin.

For example, if you have set maxPoolSize to 20, and if the DataSource jfbc3 managing connections under two username-password pairs [the default, and one other pair established via a call to getConnection user, passwordyou should expect to see as many as 40 Connections from getNumConnectionsAllUsers. With such a configuration, you will only need to deploy the JDBC jar jdcb4 with your database accessing program. Any of the following values taken from the jdk1.

Bar to add a line break simply add two spaces to where you would like the new line to be. Synchronous check-ins are likely to improve overall performance when testConnectionOnCheckin is set to false and no slow work is jdhc3 in a ConnectionCustomizer ‘s onCheckIn You can achieve this by setting maxIdleTimeExcessConnections to a value much shorter than maxIdleTimeforcing Connections beyond your set minimum size to be released if they sit idle for more than a short period of time.

However, in rare circumstances, non-c3p0 unpooled DataSources provide a user property, but not a password property, or you have access to a DataSource that you wish to wrap behind a pool, but you wish to jdc3 its build-in authentification defaults without actually modifying the user or password properties.

However, support for new configuration parameters will only be added under the new name. The JDBC spec is unforgivably silent on the question of whether unresolved jbdc3 should be committed or rolled back on Connection close.

Enhanced performance is the purpose of Connection and Statement pooling, and a major goal of the c3p0 library.


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Most of the interesting knobs and dials are represented as JavaBean properties. Perhaps the most straightforward way to create a c3p0 pooling DataSource is to instantiate an instance of com.

Obviously, if a non-zero value is set, it should be to a value longer than any Connection should reasonably be checked-out. The first method will hand you the Set of all live c3p0 PooledDataSources. The following configuration properties affect the behavior of the c3p0 library as a whole.

Because this will not always be the case, c3p0 PooledDataSources have a special property called dataSourceName. ConnectionCustomizers can be configured via user-defined configuration extensions. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy jxbc4 cookie policyjdb4c that your continued use of jdhc3 website is subject to these policies. Regards, Rahul jconnect ase asked 13 Feb ’12, There are several ways to modify c3p0 properties: The best thing to do is usually to try Step 3, see if it helps however you measure performancesee if it hurts is your application troubled by broken Connections?

In its default configuration, c3p0 does no Connection testing at all. If you can, stick with c3p0’s default behavior.

Connections from a JDBC client application

Please provide feedback, bug-fixes, etc! The following properties affect c3p0’s logging behavior. Updating requires a one-word change to your c3p0-service.