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The last piece of the HttpService test environment is a program to act as a remote server. This program needs to run a socket listener and handle requests on a secondary thread, allowing the listener to accept new requests while others are being processed. I ll call the program HostEmulator. Figure 12-15 shows its user interface.

A good and quick way to find out the initialization settings for your database is to query the V$PARAMETER view. You can run the following query to find out the values of all the parameters: SQL> SELECT name, value, isdefault FROM v$parameter; The isdefault column has a value of true if the parameter is the default value and false if you actually set it to something other than the default value. When I ran this command on my NT server, the output showed about 250 parameters. If you want to see only one or a set of related parameters and their values, you can add a WHERE clause to the previous SQL query.

Even though it s easy to query the V$PARAMETER view, there s a simpler means of querying the database about your initialization parameters. You can just type SHOW PARAMETER and you ll see all the initialization parameters with their values. You can also limit the vast amount of output by passing a keyword to SHOW PARAMETER. For example, the keywords LOCKS, FILES, LOG, and many others can be passed along to the SHOW PARAMETER command to get the values of a related set of parameters. (Note that the resulting list may not necessarily be a set of related parameters, as the command just uses a pattern search of the NAME column to pull the values from the V$PARAMETER table.) Listing 10-2 shows an example of the use of the SHOW PARAMETER command. Here, the output shows all initialization parameters that contain the string lock . Listing 10-2. Using the SHOW PARAMETER Command SQL> SHOW PARAMETER LOCK NAME ------------------------------db_block_buffers db_block_checking db_block_checksum db_block_size db_file_multiblock_read_count ddl_wait_for_locks distributed_lock_timeout dml_locks gc_files_to_locks lock_name_space lock_sga SQL> TYPE ------integer boolean boolean integer integer boolean integer integer string string boolean VALUE -----0 FALSE TRUE 8192 8 FALSE 60 400

As I mentioned at the beginning of the chapter, you have several ways to create an Oracle database. One way is to have Oracle create a database for you as part of the server software installation. You simply choose the installation option to create a new database, and Oracle will lead you through the necessary steps to configure a database. Alternatively, you can use the DBCA to create a new database.

A class called FormMain handles the user interface. A Coordinator team handles all incoming traffic, processing requests on separate threads. Figure 12-16 shows the basic class diagram of HostEmulator.

In this section, I show you how to create a new database from scratch, using individual database creation statements. Of course, if you are familiar with the database creation process, you don t have to run these SQL statements one by one just create a script with all the necessary statements, and simply execute the script from SQL*Plus.

You can use the SQL*Plus interface to create the database, either directly from a workstation or through a terminal connected to the server where you want to create the database. Before you log into the SQL*Plus session, however, you will need to set some environment variables at the operating system level.

First, make sure ORACLE_HOME is set for the session you log into. The ORACLE_HOME environment variable in Oracle Database 11g databases is in the following format: $ORACLE_BASE/product/11.1.0/db_1 You can thus set your ORACLE_HOME as in the following example: $ export ORACLE_HOME=/u01/app/oracle/product/11.1.0/db_1 Second, set the Oracle system identifier (ORACLE_SID) for your database to uniquely identify your database. This value will be the same as your DB_NAME initialization parameter value (which in this example is nina). $ export ORACLE_SID=nina Finally, make sure you set the LD_LIBRARY_PATH variable as shown here: $ export LD_LIBRARY_PATH=$ORACLE_HOME/lib

ConnectionListener +Listen()