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Adequate backups can prevent the catastrophic loss of an organization s vital business data. The Oracle DBA needs to come up with a proper backup strategy and test the backups for corruption. The DBA also needs to have recovery plans in place, and the best way to do this is to simulate several types of data loss. Proper testing of backup and recovery plans is sorely neglected in many companies, in spite of its critical importance for the company. Loss of business data not only leads to immediate monetary damage in the form of lost revenue, but also costs customer goodwill in the long run. Unplanned database downtime reflects poorly on the firm s technical prowess and the competency of the management. When disasters or technical malfunctions keep the database from functioning, the DBA can fall back on backed-up copies of the database to resume functioning at peak efficiency. The DBA is responsible for the formulation, implementation, and testing of fail-safe backup and restoration policies for the organization. In fact, no other facet of the DBA s job is as critical as the successful and speedy restoration of the company s database in an emergency. I ve personally seen careers made or broken based on one backup- and recovery-related emergency; an emergency can test the true mettle of an Oracle DBA like no other job requirement can. During those times when disaster strikes, the seasoned DBA is the one who is confident that he or she has the necessary technical skills and can remain calm in an emergency. This calmness is really the outcome of years of painstaking study and testing of the theoretical principles and the operational commands necessary to perform sensitive tasks, such as the restoration and recovery of damaged databases.

// class Router public class Router { OrderProcessor.OrderSystem orderSystem; public Router() { EstablishConnectionToServer(); } void EstablishConnectionToServer() { try { string configFile = System.Windows.Forms.Application.ExecutablePath + ".config"; RemotingConfiguration.Configure(configFile); orderSystem = (OrderProcessor.OrderSystem)Activator.GetObject( typeof(OrderProcessor.OrderSystem), "tcp://localhost:8011/AsapOrders"); } catch (Exception ex) { throw new Exception("Couldn't connect to Order Processing server. + "Details:\n\n" + ex.Message); } } public void SubmitOrder(string theModel, string theStyle, Color theColor, PricedItem[] theOptions) { orderSystem.SubmitOrder(theModel, theStyle, theColor, theOptions); } public string[] GetModels() { return orderSystem.GetModels(); } public string[] GetStyles(string theModel) { return orderSystem.GetStyles(theModel); } public Color[] GetColors(string theModel, string theStyle) { return orderSystem.GetColors(theModel, theStyle); }

After the DBA has created database objects, schemas, and users, he or she needs to load the data, usually from older legacy systems or sometimes from a data warehouse. If the data loads need to be done on a periodic basis, the DBA needs to design, test, and implement the appropriate loading programs.

Developed by Linus Torvalds, Linux is constantly under development because it is released under an open source license and is freely available for download from the Internet. Many users prefer to use Linux because more programs and drivers are available, it s free (or close to free, as the commercial versions are fairly cheap), and bug fixes are released very quickly. Oracle Database 11g was developed on the Linux platform, and that s why the Linux-based version was the first to be released for production use. Oracle has certified and supports Red Hat Enterprise Linux AS and ES (either the 4.0 or the 5.0 version), SUSE LINUX Enterprise Server 10, Asianux 2 and 3, and the Enterprise Linux, versions 4 and 5.

Note I used a Linux 4.0 distribution from Red Hat to run Oracle Database 11g on my Windows XP desktop for the purposes of this book. I used the VMware virtual operating system tool (http://www.vmware.com) to run the Linux operating system alongside Windows.

// each entry in the returned array is a PricedItem[] public ArrayList GetOptions(string theModel, string theStyle) { return orderSystem.GetOptions(theModel, theStyle); } }

Oracle was the first company to offer a commercially available database for the Linux operating system. Oracle even offers a full suite of clusterware for Linux, which makes it possible to use Oracle s Real Application Clusters (RAC) on Linux without the more costly and complex raw file systems. Do all these moves toward the Linux operating system foreshadow the demise of the UNIX operating system Although the market for UNIX systems has dropped in recent years, you have to interpret this fact cautiously; most of the movement toward the Linux operating system is intended for lowend machines that serve network and other desktop applications. For the foreseeable future, UNIXbased systems will continue to rule the roost when it comes to large, company-wide servers that run large and complex databases such as Oracle Database 11g. IT organizations are moving to Linux and open source software to solve a wide variety of business problems. The Linux platform often plays the central role in establishing a low-cost computing infrastructure. Oracle s grid initiative relies on using massive numbers of cheap commodity servers based on the Linux platform. Although Linux is growing very fast as a viable operating system for Oracle databases, the consensus among the IT industry is still that Linux is mainly useful for services, and not for mission-critical databases. This leaves UNIX and Windows as the two leading operating systems for Oracle databases. Oracle provides support to the Linux community by offering code for