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This crucial initialization parameter specifies how Oracle s SQL statements are supposed to share cursors. The three possible values are forced, exact, and similar. You ll learn more about setting this parameter in s 19 and 20. Example: CURSOR_SHARING = force Default value: exact Parameter type: Dynamic. Both the ALTER SESSION and ALTER SYSTEM commands can be used to change the value.

While building a multithreaded remote server to test HttpService sounds like a fairly complicated task, it really isn t. Figure 12-12 shows the client test fixture s UI.

You have to be extremely careful when using the CURSOR_SHARING parameter. As you ll learn in 19, using the forced option will force Oracle to use bind variables, and thus will enhance your application performance. However, there are many caveats, and the wrong option for this parameter can hurt performance.

The DB_BLOCK_SIZE parameter sets the standard database block size (measured in bytes, such as 4096, which is a 4KB block size). The System tablespace and most other tablespaces use the standard block size. You set the standard block size from 2KB to 32KB (2, 4, 8, 16, or 32) in the DB_BLOCK_SIZE parameter. (Because the size is specified in bytes, the actual range for the DB_BLOCK_SIZE parameter is 2,048 32,768.) You can also specify up to four nonstandard block sizes when creating tablespaces. You have to carefully evaluate your application s needs before you pick the correct database block size. Whenever you need to read data from or write data to an Oracle database object, you do so in terms of data blocks. Also, you always should make the DB_BLOCK_SIZE value a multiple of your operating system s block size, which you can ascertain from your UNIX or Windows system administrator.

Remember that the data block is the smallest unit in the Oracle physical database structure. When you are querying data, the rows aren t fetched individually; rather, the entire set of blocks in which the rows reside is read into memory in one fell swoop.

Figure 12-12. The client test fixture s user interface The client needs to support pipelined requests, so you know the client has to be multithreaded. When the user clicks the Send button, the client program must send as many concurrent requests as indicated by the user. Each request contains a simple string, indicating the current time. HttpService tags each request with a sequence number, which is displayed in the UI. The remote server s address is hard-coded to localhost, indicating the machine on which the client is running. Two classes implement the client: a Worker and a Coordinator. The former is a Form class that hosts the user interface. The latter is a class that handles all the threading logic. Figure 12-13 shows the coupling diagram of the program.

If you re supporting data warehouse applications, it makes sense to have a very large DB_BLOCK_ SIZE something between 8KB and 32KB. This will improve database performance when reading huge chunks of data from disk. Large data warehouses perform more full table scans and thus perform more sequential data access than random access I/Os. However, if you re dealing with a typical OLTP application, where most of your reads and writes consist of relatively short transactions, a large DB_BLOCK_SIZE setting would be overkill and could actually lead to inefficiency in input and output operations. Most OLTP transactions read and write a very small number of rows per transaction, and they conduct numerous transactions with random access I/O (index scans), so you need to have a smaller block size, somewhere from 2KB to 8KB. A larger block size may be too large for most OLTP applications, as the database has to read large amounts of data into memory even when it really needs very small bits of information. Data warehousing applications, on the other hand, will benefit from a large block size, say 32KB. Example: DB_BLOCK_SIZE=32768 Default value: 8192 (bytes) Parameter type: Static