A database index is a data structure that improves the speed of operations in a table. Indices can be created using one or more columns, providing the basis for both rapid random lookups and efficient ordering of access to records. The disk space required to store the index is typically less than the storage of the table (since indices usually contain only the key-fields according to which the table is to be arranged, and excludes all the other details in the table), yielding the possibility to store indices into memory from tables that would not fit into it. In a relational databasean index is a copy of part of a table. Some databases extend the power of indexing by allowing indices to be created on functions or expressions. For example, an index could be created on upper(last_name), which would only store the uppercase versions of the last_name field in the index. Another option sometimes supported is the use of "filtered" indices, where index entries are created only for those records that satisfy some conditional expression. A further aspect of flexibility is to permit indexing on user-defined functions, as well as expressions formed from an assortment of built-in functions.

A database is a logically coherent collection of data with some inherent meaning, representing some aspect of real world and which is designed, built and populated with data for a specific purpose.

Group of communications products (including a protocol suite) developed and supported by Digital Equipment Corporation. DECnet/OSI (also called DECnet Phase V) is the most recent iteration and supports both OSI protocols and proprietary Digital protocols. Phase IV Prime supports inherent MAC addresses that allow DECnet nodes to coexist with systems running other protocols that have MAC address restrictions.

Technique for distributing traffic between two bridges across a circuit group. Guarantees packet ordering between sourcedestination pairs and always forwards traffic for a sourcedestination pair on the same segment in a circuit group for a given circuit-group configuration.

It is the risk found in the environment and in human activities that is part of existence. In accounting, it is the susceptibility of an audit area to error which could be material, individually or in combination with other errors, assuming that there are no related internal controls.

Grouping of associated serial lines that link two bridges. If one of the serial links in a circuit group is in the spanning tree for a network, any of the serial links in the circuit group can be used for load balancing. This load-balancing strategy avoids data ordering problems by assigning each destination address to a particular serial link.

When ordering a replacement power supply, you must remember to take into account its form factor and its wattage rating requirements. The wattage rating is a measurement of the total power the supply can deliver to the system. More heavily equipped systems (that is, more disk drives and peripherals) require power supplies with higher wattage ratings.

When a PC is turned on, it begins carrying out software instructions from its BIOS program. This small program is permanently stored in the ROM BIOS memory IC located on the system board. The information stored in this chip represents all the inherent intelligence that the system has until it can load more information from another source, such as a disk drive or remote server computer.

-> The same auto variable name can be used in different blocks-> There is no side effect by changing the values in the blocks
-> The memory is economically used-> Auto variables have inherent protection because of local scope

The science of cryptography has existed in one form or another for centuries.
Cryptography is the art of encoding and decoding messages for transmission between two parties, while keeping the message secret from unwanted viewers. There are many common implementations of cryptography in use today such as the HTTPS protocol on the Internet. All forms of data encryption and cryptography require a key in some form or another for use in encoding and decoding data. There are even some modern methods of encryption that have been mathematically proven to be unbreakable if they are
implemented properly.The inherent problem with any form of cryptography is in the method of key distribution.To date, all forms of message encryption have possessed this major vulnerability. As such, it makes no difference whether a secret message is sent via homing pigeon, a radio transmission, a penciled message on a notepad, or whispering to another, there is no physical way to get a cryptographic key to another without running the risk of  the key being intercepted.To solve this dilemma, a radical solution has been proposed called quantum cryptography. This method essentially uses photon light particles to send a key to an intended recipient. The difference with this method of key distribution is that it implements quantum mechanic's uncertainty principle as a means to guarantee the privacy of a key during distribution. Practically, quantum cryptography has the ability to afford complete privacy during the entire broadcast of an encoded message.
In quantum computing, we use the concept of qubits, superposition and coherence. A normal bit can be in only two states - 0 and 1. But a qubit it can be in 0, 1, or in the superposition of 0 and 1.
Quantum computers, will be much much faster than traditional silicon based compuers