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Every Oracle instance has one big memory structure referred to as the System Global Area (SGA). This is a large, shared memory structure that every Oracle process will access at one point or another. It will vary in size from a few of megabytes on small test systems, to hundreds of megabytes on medium to large systems, up to many gigabytes in size for really big systems. On a UNIX operating system, the SGA is a physical entity that you can see from the OS command line. It is physically implemented as a shared memory segment a stand-alone piece of memory to which processes may attach. It is possible to have an SGA on a system without having any Oracle processes; the memory stands alone. It should be noted, however, that if you have an SGA without any Oracle processes, this is an indication that the database crashed in some fashion. It is an unusual situation, but it can happen. This is what an SGA looks like on Red Hat Linux: [tkyte@localhost tkyte]$ ipcs -m | grep ora 0x99875060 2031619 ora10g 660 538968064 0x0d998a20 1966088 ora9ir2 660 117440512 0x6b390abc 1998857 ora9ir1 660 130560000 15 45 50

Relational calculus does not involve the mathematical complexity of relational algebra; it focuses only on what the database is being queried for, rather than how to conduct the query. In other words, it is a declarative language. You focus on the results you expect and the conditions to be satisfied in the process, and you ignore the sequencing of the relational algebra concepts. Relational calculus is based on a part of mathematical logic called propositional calculus or, more precisely, first-order predicate calculus. Relational calculus involves the use of operators such as AND and OR to manipulate relations in logical expressions.

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Relational calculus is far easier to use than relational algebra, but it still is based on the principles of logic and it is not easy for most people to use. You thus need an easy-to-use implementation of relational calculus. Structured Query Language (SQL) is one such implementation, and it has become hugely popular as the predominant language for the relational database model. SQL is considered a relationally complete language, in the sense that it can express any query that is supported by relational calculus. Structured English Query Language (SEQUEL), the precursor of SQL, was developed by IBM to use Codd s relational database model. Oracle introduced the first commercially available implementation of SQL in 1979 (when Oracle was known as Relational Software), and SQL has since become the standard language for RDBMSs, although not all implementations adhere completely to the official standards. Oracle has its own implementation of SQL, which is very close to the American National Standards Institute (ANSI) standard (visit http://www.ansi.org/ for more information). SQL is an English-like language that enables you to manipulate data in a database. Using SQL, you can derive any relation that can be derived using relational calculus. You can formulate queries in easy-to-format structures, which are then processed by sophisticated database servers into complex forms to get the queried data. Its intuitive appeal, ease of use, and tremendous power and sophistication have made SQL the language of choice when working with any relational database. You can divide SQL statements into two major categories: data definition language (DDL) and data manipulation language (DML). DDL statements are used to build and alter database structures, such as tables, and to define and construct database schemas. DML statements are used to

Assume the variable OnX is part of an object named myObject, of type MyClass A subscriber containing a universal method called DoSomething might be subscribed to myObject using this notation: myObjectOnX = new MyClassUniversalMethod(DoSomething); The code instantiates a new UniversalMethod variable, pointing at the subscriber s DoSomething method The variable is then assigned to myObjectOnX, using a plain assignment operator While the assignment operator can be used to register subscriptions, it is rarely used in the context of events Why The reason is simple C# delegates support multicasting, and the assignment operator does exactly what you would expect: It assigns a value to a delegate variable In doing so, it wipes out any other references being held by the delegate To avoid this problem, subscribers must subscribe using the += operator, to add a subscription to those already present.

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