$Pre is a global variable whose value, if set, is applied to every input expression.

$UserBaseDirectory gives the base directory in which user-specific files to be loaded by Mathematica are conventionally placed.

$SQLUseConnectionPool gives the default setting that specifies whether a connection pool is used to retrieve a connection.

When many rows of data are returned from a database query, a significant amount of memory may be required to hold the result. If all of the data does not need to be available ...

Java Connection Management >, InstallJava AddToClassPath ShowJavaConsole ..., Java Classes and Objects >, LoadJavaClass -- load and set up a Java class for use from ...

Launching Java, InstallJava -- launch the Java runtime and prepare it for use from Mathematica, ReinstallJava -- quit and restart the Java runtime, UninstallJava -- quit the ...

JavaClass[classname, n] represents a Java class with the specified name.

JavaObjectQ[expr] gives True if expr is a reference to a Java object or Null, and gives False otherwise.

LoadedJavaObjects[] returns a list of the Java objects that have been sent to Mathematica (and not yet released with ReleaseJavaObject).

SetInternetProxy[host, port] sets proxy information in your Java session for accessing the internet.