BC remote Oracle DBA - Call (800) 766-1884  
Oracle Consulting Oracle Training Development

Remote DBA

Remote DBA Plans  

Remote DBA Service

Remote DBA RAC

Remote DBA Oracle Home
Remote DBA Oracle Training
Remote DBA SQL Tuning Consulting
Remote DBA Oracle Tuning Consulting
Remote DBA Data Warehouse Consulting
Remote DBA Oracle Project Management
Remote DBA Oracle Security Assessment
Remote DBA Unix Consulting
Burleson Books
Burleson Articles
Burleson Web Courses
Burleson Qualifications
Oracle Links
Remote DBA Oracle Monitoring
Remote DBA Support Benefits
Remote DBA Plans & Prices
Our Automation Strategy
What We Monitor
Oracle Apps Support
Print Our Brochure
Contact Us (e-mail)
Oracle Job Opportunities
Oracle Consulting Prices





Remote DBA services

Remote DBA Support

Remote DBA RAC

Remote DBA Reasons

Remote Oracle Tuning

Remote DBA Links

Oracle DBA Support

Oracle DBA Forum

Oracle Disaster

Oracle Training

Oracle Tuning

Oracle Training

 Remote DBA SQL Server

Remote MSSQL Consulting

Oracle DBA Hosting

Oracle License Negotiation








Using Oracle DropJava

Oracle Tips by Burleson Consulting

The DropJava utility drops individual Java sources and binaries and entire JAR files. It also maintains the hash table that LoadJava uses to track the loading of Java library units. You can enter .java, .class, and .jar files on the command line in any order. Here is the syntax:

[{-v | -verbose}]
[{-t | -thin} | {-o | -oci81}]
[{-u | -user} username/password@host_name:port_number:database_sid]
{filename.java | filename.class | filename.jar} ...

The following list presents the DropJava command-line options:




Enables verbose mode, in which progress messages are displayed.

-t | -o   

Selects the client-side JDBC driver used to communicate with Oracle. You can choose the Thin JDBC Driver (the default) or the OCI JDBC Driver.


Specifies a database connect string without spaces. The string includes a user name, password, host-computer name, port number, and database system identifier. If this option is not specified, the string defaults  to internal/oracle@localhost:1521:orcl.

DropJava Examples  

In the first example, DropJava drops various Java binaries and resources. The utility reads the JAR files, then drops each Java class or resource from your schema.

> dropjava -u scott/tiger@myComputer:1521:orcl manager.jar

In the next example, operating in verbose mode, DropJava drops a Java class:

> dropjava -v -u scott/tiger@myComputer:1521:orcl Calculator.class
dropping Calculator

Using CREATE Java

In Oracle8i and Oracle9i, Java, an object-oriented development language, was added to the Oracle kernel. In previous versions, Java, JDBC (Java Database Connectivity), and SQLJ, Oracle痴 PRO*Java product, provided connectivity to the database, but Java was relegated to the outside, along with the other languages, such as C, C++, FORTRAN, and COBOL. Now Java is allowed inside the database. Java can be used for procedures, functions, and methods and will be stored inside the database just like PL/SQL.

However, in order to move Java into the database, a way had to be provided to bridge the gap between the normal database lingua franca, PL/SQL, and the new Java classes. This bridge between Java and PL/SQL is the Java object.

Creation of a Java Object

The Java object is created using the CREATE JAVA command, which is documented in the SQL Reference Manual on the documentation website. Java is stored in much the same way as PL/SQL in database tables. Once called into memory (by standard function, procedure, and method calls), it is placed in its own area. The area where Java resides is appropriately called the Java Pool and is configured at 20 MB by default but can be increased by use of the JAVA_POOL_SIZE initialization parameter if required.  Let痴 look at an example of the CREATE JAVA command.

Note: Java is not available until version 8.1.4.

Public static String Login() (
Return 'You are logged into ORTEST1'; ) );

Use of the Java Object

A function or procedure call is wrapped around the Java object in order to make it callable:

LANGUAGE JAVA NAME 'Login() return String()';

Once the Java object is wrapped, it is called just as the function or procedure would be called; in addition, the object can be included in a package specification. The Login Java object would be called like this:


Finally, we are ready to call the function Login. Remember, in a CALL statement, host variables must be prefixed with a colon.

SQL> CALL Login() INTO :t;

Call completed.


You are logged into ORTEST1

For more complex examples, refer to the Java Developer痴 Guide.

Altering Java Objects

The ALTER JAVA command is used to alter Java objects. The syntax for the ALTER JAVA command is:

ALTER JAVA Source|CLASS [schema.]object_name
[RESOLVER ((match_string [,] schema_name|- ))
[COMPILE|RESOLVE] [invoker_rights_clause]

The ALTER JAVA command is only used to force resolution of Java objects (compilation). The Java source must be in your own schema, or you must have the ALTER ANY PROCEDURE, or the source must be declared PUBLIC. You must also have EXECUTE privilege on the Java object.

An example use of the ALTER JAVA command is:

RESOLVER (("D:\orant81\java\bin\*.*" , tele_Remote DBA)(* public))

Dropping Java Objects

If you don稚 use the DropJava utility, you may cause inconsistencies in Oracle internal tables; that is, the command for dropping Java objects is:

DROP JAVA [schema.]java_name;

Memory and Java Objects

Java uses the shared pool and the Java pool. The default in 8.1.3 for the Java pool is almost 10 MB; for the 8.1.4 beta it was upsized to 20 MB, and there it has remained. If you get memory-related errors when dealing with Java objects, increase the size of the Java pool. In Oracle9i the Java pool should be near 60 megabytes.

Error reporting in out-of-memory situations is inconsistent and in some cases may result in a core dump.  If you suspect that memory usage is the cause of a core dump, adjust the JAVA_POOL_SIZE in the init.ora file. JAVA_POOL_SIZE should be set to 60,000,000 or higher for large applications in Oracle9i.  The default value of 20,000,000 in 8.1.4 and 8.1.5 should be adequate for typical Java Stored Procedure usage before release 9i.

See Code Depot for Full Scripts

This is an excerpt from Mike Ault, bestselling author of "Oracle 10g Grid and Real Application Clusters".

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.

Expert Remote DBA

BC is America's oldest and largest Remote DBA Oracle support provider.  Get real Remote DBA experts, call
BC Remote DBA today.



Remote DBA Service

Oracle Tuning Book


Advance SQL Tuning Book 

BC Oracle support

Oracle books by Rampant

Oracle monitoring software







BC Remote Oracle Support

Remote DBA

Remote DBA Services

Copyright ゥ 1996 -  2013 by Burleson. All rights reserved.

Oracleョ is the registered trademark of Oracle Corporation.

Hit Counter