Search results
Results from the WOW.Com Content Network
Attempting to execute code when the page table has the NX bit (no-execute bit) set in the page table causes a page fault. This can be used by an operating system, in combination with the read-only bit, to provide a Write XOR Execute feature that stops some kinds of exploits. [3]
Similarly, a page frame is the smallest fixed-length contiguous block of physical memory into which memory pages are mapped by the operating system. [ 1 ] [ 2 ] [ 3 ] A transfer of pages between main memory and an auxiliary store, such as a hard disk drive , is referred to as paging or swapping.
With the growing use of the archetypal LAMP, variations and retronyms appeared for other combinations of operating system, web server, database, and software language. For example, an equivalent installation on the Microsoft Windows operating system family is known as WAMP. An alternative running IIS in place of Apache is called WIMP. Variants ...
Operating systems provide common services, such as an interface for accessing network and disk devices. This enables an application to be run on different hardware without needing to be rewritten. [15] Which services to include in an operating system varies greatly, and this functionality makes up the great majority of code for most operating ...
Container diagrams (level 2): decompose a system into interrelated containers. A container represents an application or a data store; Component diagrams (level 3): decompose containers into interrelated components, and relate the components to other containers or other systems; Code diagrams (level 4): provide additional details about the ...
The database schema is the structure of a database described in a formal language supported typically by a relational database management system (RDBMS). The term " schema " refers to the organization of data as a blueprint of how the database is constructed (divided into database tables in the case of relational databases ).
Since the early 1990s, the operational database software market has been largely taken over by SQL engines. In 2014, the operational DBMS market (formerly OLTP) was evolving dramatically, with new, innovative entrants and incumbents supporting the growing use of unstructured data and NoSQL DBMS engines, as well as XML databases and NewSQL databases.
An example of this is the function block diagram, one of five programming languages defined in part 3 of the IEC 61131 (see IEC 61131-3) standard that is highly formalized (see formal system), with strict rules for how diagrams are to be built. Directed lines are used to connect input variables to block inputs, and block outputs to output ...