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Oracle Corporation actively works with vendors to ensure that storage arrays and other technologies are compatible with its own architectural requirements. Oracle manages a vendor-oriented certification program called the Oracle Storage Compatibility Program (OSCP). As part of the OSCP, Oracle provides test suites for vendors to ensure their products are compatible with Oracle Database 11g. In this certification program, vendors normally test their storage systems on several platforms, including several variants of the UNIX operating system, Linux, and Windows. Oracle has also been responsible for the Hardware Assisted Resilient Data (HARD) initiative. HARD s primary goal is to prevent data corruption and thus ensure data integrity. The program includes measures to prevent the loss of data by validating the data in the storage devices. RAID devices do help protect the physical data, but the HARD initiative seeks to protect the data further by ensuring that it is valid and is not saved in a corrupted format. Availability and protection of data are enhanced because data integrity is ensured through the entire pipeline, from the database to the hardware. Oracle databases do have their own corruption-detecting mechanisms, but the HARD initiative is designed to prevent data corruption that could occur as you move data between various operating system and storage layers. For example, EMC Corporation s solution to comply with the HARD initiative involves checking the checksums of data when they reach their storage devices and comparing them with the Oracle checksums. Data will be written to disk only if the two checksums are identical.

Also, the shared-files approach described works only in a one-to-one relationship between sender and receiver If there are multiple receivers, you must also devise a mechanism to prevent subscribers from interfering with one another, since they all have to share the same files..

Note New technologies have come to the fore in recent years that enable businesses to operate on a 24/7 basis as well as to provide data protection. Backup windows are considerably reduced by the use of these new technologies, which enable nondisruptive backup operations. These backup technologies include the clone or snapshot techniques, which enable a quick copy to be made of the production data onto a different server. Compaq s SANworks Enterprise Volume Manager, Hewlett-Packard s Business Copy, Fujitsu s Remote Equivalent Copy, and Sun s StorEdge Instant Image all allow data copying between Oracle databases at a primary site to databases at remote locations. The key thing to remember is that these techniques take snapshots of live data in very short time periods, so these techniques can be used for backup purposes as well as for disaster recovery.

The assumption that underlies the use of the CBO is that the optimizer knows best. That is, by evaluating the various statistics, the CBO will come to the best decision in terms of choosing the optimal execution plan. However, the optimizer is based on rules, and a good application developer has knowledge about the application and data that the CBO can t exploit. You can provide hints to the optimizer to override the CBO s execution plans. For example, if you know that a certain index is more selective than another, you can force Oracle to use that index by providing the hint in your query. Hints can alter the join method, join order, or access path. You can also provide hints to parallelize the SQL statement operations. The following are some of the common hints that you can use in SQL statements: ALL_ROWS: The ALL_ROWS hint instructs Oracle to optimize throughput (that is, minimize total cost), not optimize the response time of the statement. FIRST_ROWS(n): The FIRST_ROWS(n) hint dictates that Oracle return the first n rows quickly. Low response time is the goal of this hint.

Pipes are another type of shared resource that you can use to send notifications across thread and process boundaries. A pipe essentially acts as a conduit for a byte stream that is written at one end and read at the other. Pipes are communication channels, much like network connections. Pipes are synchronized internally and support concurrent reading and writing. The sender formats data in a pre-agreed fashion and writes it to the pipe. The reader can check the pipe on the other end to see if there is any data in it. If so, it can read the data, which will emerge as a sequence of bytes ordered the way they were written. Figure 8-17 shows a pipe used to exchange information between two processes.

When you specify ALL_ROWS or the FIRST_ROWS(n) hint, it overrides the current value of the OPTIMIZER_MODE parameter, if it s different from that specified by the hint.

FULL: The FULL hint requires that a full scan be done on the table, ignoring any indexes that may be present. You would want to do this when you have reason to believe that using an index in this case will be inefficient compared to a full table scan. To force Oracle to do a full table scan, you use the FULL hint. ORDERED: This hint forces the join order for the tables in the query. INDEX: This hint forces the use of an index scan, even if the optimizer was going to ignore the indexes and do a full table scan for some reason.