Updating The Primary Key In Db2 Connect

What are mainframe computers Mainframes 3. What are mainframe computers A mainframe computer is a big computer. IBM builds mainframe computers. Today, a mainframe refers to IBMs System Z servers. Many large corporations like banks, insurance companies, travel and retail sector, telecom companies process data on a mainframe. Today, thousands of people around the globe book flights, do wire transfers, make credit card purchases. VSphere 4. 1 ESX and vCenter vSphere 4. ESX and VCenter Introduction to VMware vSphere VMware vSphere Introduction VMware vSphere Components. VersaCold is a onestop Supply Chain Solution providing Global Logistics Solutions that no other Canadian supplier can match. Visit Our Website to Learn More. DB2 UDB maintains a set of special tables called the system catalog. These tables, which contain the metadata that describes database objects, have two sets of views. Updating The Primary Key In Db2 Connect' title='Updating The Primary Key In Db2 Connect' />These transactions are processed in a snap by a mainframe. Mainframe RAS features. Reliability is the ability of computer hardware or software to consistently perform according to its specifications. Mathematically, reliability measure is the mean time to failureMTTF. Availability is the ratio of the uptime of a system to the total time. Serviceability is an expression of the ease with which a system can be maintained or repaired. The reliability, availability and serviceability features are in the System Zs DNA. System Z is designed to provide an availability of 9. The Z in System Zs brand name stands for zero down time. System Z servers have reported an MTTF of 4. Organizations run their mission critical applications on mainframe to provide 2. Updating The Primary Key In Db2 Connect' title='Updating The Primary Key In Db2 Connect' />System Z processors use an instruction retry mechanism. Every instruction that executes successfully on the System Z processor is chekpointed, the processor state is saved. If an error is detected, a recovery sequence commences. The processor is fenced off. The processor state is refreshed from the last checkpoint and the instruction is retried. Like having spare tyres on a truck, System Z offers chip redundancy. If one processor fails, System Z can dynamically switch to a spare without losing a beat Thousands of error checkersparity, residue, illegal state, hardware redundancy compares and so on are embedded on the chip. Are Mainframe computers good at everything Well, not quite. Mainframes are not good at number crunching or dont do scientific calculations. IBM WebSphere Application Server provides periodic fixes for the base and Network Deployment editions of release V8. The following is a complete listing of fixes. NewUser Registration Member Login Recent Topics Forum Rules Forum FAQ User Profile. Latest trending topics being covered on ZDNet including Reviews, Tech Industry, Security, Hardware, Apple, and Windows. A Mainframe is not a Super computer. You wouldnt use a Mainframe computer to calculate the value of Pi, up to 1. Places. Mainframe Computers are not meant for speed. They arent fast, rather they can process humungous data reliably. You cant play games like Counter Strike or Half Life on a Mainframe. Mainframe computers dont have a beautiful user interface like the PC at your home. You wouldnt find a desktop wallpaper or icons on a mainframe computer. Mainframe Hardware Fig. A walkthrough the z. Enterprise EC 1. 2A Mainframe computer has processing unitsPUs, memory, IO channels, control units and peripheral devices. A processing unitPU is the brain of the mainframe computer, that executes instructions. A mainframe computer has many processors. The total of all processor unitsPUs are inside a cageframe called the Central Processing ComplexCPC. There are specialized PUs capable of performing specific tasks. The main processors are called the Central processorCPs. There are PUs for encryption and decryptionCPACF, Linux workloadsIFL, the co ordination of the system effortsICF, those that assist the CP for any workload on the I O subsystemSAP, spares that come in handy when a CP fails, others for executing Java codez. AAP and providing accelerated DB2 performancez. IIP. Buy a z. Mainframe server, and youd get 1. IFLs, 1. 2 ICFs, 6 z. AAPs and 6 z. IIPsSource IBM. The CPC cage also contains main storageRAM. A z. 10 mainframe can provide upto 3. GB of RAM memory. A channel is an independent data and control path between IO devices and the memory. Peripheral devices like disk drives, tapes, printers, card readers, card punch are connected to a mainframe computer using channels. Because peripheral devices are relatively slower than the CPU, the CPU could waste time waiting for data from a peripheral device. A I O Control unit is a self contained processor, and has logic to work with a particular type of peripheral device. Channels connect to control units, which in turn manage the peripheral device. A personal computer offers different ports to connect peripherals. It has USB ports, SCSI bus. The Mac has high speed firewire port. Likewise, on the mainframe, channels can be OSA, ESCON or FICON. OSA Express channels are used to connect to standard networking technologies such as LANEthernet, Token Ring. ESCON and FICON channels have fiber optic cables. Mainframe Peripherals Just as you use a keyboard, mouse and a CRT display to operate a Personal Computer, in the early days you operated a mainframe computer by a terminal. A terminal had a display and a keyboard. A very popular terminal manufactured by IBM in the 7. Terminal. Have a look at the photograph below. Terminals connected to a mainframe computer remotely, over a network. They used the IBM 3. IBM no longer manufactures terminals, instead you use a PC running a software that mimics the terminal. Terminal emulators such as the IBM Personal Communications are quite popular. Storage devices such as Magnetic Disk drives are used as secondary memory. IBM uses the term DASDDirect Access Storage Device pronounced as dazz dee for hard disks. Disk drives support random access to data. IBM 3. 38. 0 and 3. Enema Erotic. DASD models are widely in use. The picture below shows a 3. DASD assemblySource IBM Archives. Tape drives are also used for storage. A Tape drive allows sequential access of data. Very large files can be stored on tape drives. Tape drives are often used for a backup of data. IBM continues to innovate the tape drive technology. IBM 3. 48. 0 tapes were very popular in the last century. The picture below shows two 3. Tapes now come in a square cartridge form, instead of a tape reel. Punched CardsHollerith Cards although obsolete, have been used over a century for recording information. A punched card was a stiff paper, that represented information by the presence or absence of holes. Punched cards were used by Joseph Jacquard in the early 1. By using a particular punched card, you could select a weaving pattern. Herman Hollerith proposed the use of punched cards to store information about US nationals during the 1. Jacquard cards were read only. Hollerith envisioned that punched cards could be used as a readwrite technology. A key punching machine could be used to punch data such as age, sex or marital status of the citizen. In the picture below, you see the operators preparing data for the census. Source Computer Science Labs. By the early 2. 0th century, punched cards began to be used everywhere in the United States. Your gas bill would arrive every month with a punched card, that stored the customer name, the address, the bill amount and the due date. In the 2. 0th century, punched cards were used as legal documents such as US government checks. Hollerith founded a company, The Tabulating Machine Company1. International Business MachinesIBM1. IBM manufactured the standard 8. A deck of cards were fed through a hopper into a card reader. Output data could be punched onto cards using a card punch. The photograph aboveSource IBM Archives shows a standard 8. IBM card. A legacy of 8. The columns 7. 3 8. Mainframe computer industry and the people involved To oversee the running of a mainframe computer, you need to hire professionals called System OperatorsSysops. Mainframe sysops have good knowledge of the mainframe architecture and the operating system. The operating system on the z. OSpronounced as zee OS. Newest database Questions Stack Overflow. A database is an organized collection of data. It is the collection of schemas, tables, queries, reports, views, and other objects. The data are typically organized to model aspects of reality in a way that supports processes requiring information. Use this tag if you have questions about.