JDBC3 0 DRIVER DETAILS:
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JDBC3 0 DRIVER
It supports JDBC 1.
Jdbc3 0 contains additional support for javax. Skip site navigation 1 Skip section navigation 2. Much better than working-around is fixing. If, in addition to setting unreturnedConnectionTimeoutyou set debugUnreturnedConnectionStackTraces to truethen a stack trace will be captured each time a Connection is checked-out. Whenever an unreturned Connection times out, that stack trace will be printed, revealing where a Connection was checked out jdbc3 0 was not checked in promptly.
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Timer threadsand does so lazily in response to the first client request jdbc3 0 by a PooledDataSource. By default, the Threads spawned by c3p0 inherit a java. If that Thread came from a client that may need to be hot-undeployed, references to these objects may prevent the undeployed application, often partitioned into a ClassLoaderfrom being garbage collected.
See for example this description of Tomcat memory leaks on redeployment. The default which yields the jdbc3 0 behavior described above jdbc3 0 caller. Set this to library to use c3p0's ClassLoader, so that no reference is maintained to a client that may need to be redeployed.
MySQL :: MS Access migration using the HXTT Access JDBC package
Set this to true so that c3p0's Threads use the the c3p0 library's AccessControlContextrather than an AccessControlContext that may be associated with the client application and prevent its jdbc3 0 collection. See Appendix A for information about the following configuration properties:.
By default, each DataSource has only three associated helper threads. Jdbc3 0 performance seems to drag under heavy load, or if you observe via JMX or direct inspection of a PooledDataSourcethat the number of "pending tasks" is usually greater than zero, try increasing numHelperThreads. See Appendix A for more.
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However, asynchronous checkins add to Thread pool congestion. Under loads so large that it is impractical to expand numHelperThreads to reduce congestion, forceSynchronousCheckins will cause client Threads to perform the checkin operations, adding to the load of the Thread pool and precluding any delays in termination of checkin due to Thread pool congestion. As long as you jdbc3 0 perform Connection tests on check-in see testConnectionOnCheckin nor perform database operations or other slow work in ConnectionCustomizer.
However, if Connections are tested on check-in, or custom work is performed, setting forceSynchronousCheckins will cause clients to experience delays associated with that work when they call Connection. It permits you to use an old, now superceded implementation of C3P0-generated proxy objects. C3P0 used to use reflective, dynamic proxies. Now, for enhanced performance, it uses code-generated, nonrefective implementations. You will find that c3p0 jdbc3 0 MBeans under the domain com.
Each PooledDataSource within your application may have the following attributes embedded within its ObjectName : type identityToken name. The type will always be Jdbc3 0.
The identityToken is a unique String associated with each c3p0 DataSource. The name will be the value of the property dataSourceNamejdbc3 0 you can set yourself to ensure that semanically equivalent data sources are identifiable across application restarts. If you do not set a dataSourceNamethe name attribute may not be defined at all, or it may take some default value. If you can, stick with c3p0's default behavior. Jdbc3 0 if you really need to, you can configure c3p0 to exclude the identityToken attribute from ObjectNames, so that your PooledDataSources have predictable, reproducible names. Set the following, as a System property, in c3p0.
Q Which action can be used to load a database dr
Otherwise, only one of the PooledDataSources with identical names will be accessible by Jdbc3 0, and which one will be undefined.Hibernate Data Type-Java Data Jdbc3 0 - SQL Data Type mapping. Added a new data type i.e.
N. Auto- loading of JDBC driver class: In JDBC 4 jdbc3 0 the getConnection on DriverManager will automatically load a driver. And, has the next to last line of the last response points out, the fix is in the jdbc3. 0 driver (db2jcc) and not in the jdbc driver (db2jcc4).