WebWikipedia offers free copies of all available content to interested users. These databases can be used for mirroring, personal use, informal backups, offline use or database queries (such as for Wikipedia:Maintenance).All text content is multi-licensed under the Creative Commons Attribution-ShareAlike 3.0 License (CC-BY-SA) and the GNU Free …

WebDNS spoofing, also referred to as DNS cache poisoning, is a form of computer security hacking in which corrupt Domain Name System data is introduced into the DNS resolver's cache, causing the name server to return an incorrect result record, e.g. an IP address.This results in traffic being diverted to the attacker's computer (or any other computer).

WebA database transaction symbolizes a unit of work, performed within a database management system (or similar system) against a database, that is treated in a coherent and reliable way independent of other transactions.A transaction generally represents any change in a database. Transactions in a database environment have two main purposes: …

WebHistory, sources, uses, and scope. The TSDB is overseen by the FBI Terrorist Screening Center.It was created after the September 11 attacks. A 2007 report by the U.S. Department of Justice Office of the Inspector General stated that the TSDB, as the "U.S. Government's consolidated terrorist watchlist" contained "basic biographical information on known or …

WebA database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Indexes are used to quickly locate data without having to search every row in a database table every time a database table is accessed. Indexes can be created using …

WebTechnical basis and theoretical concepts. Relational database concepts of computer science and Information retrieval concepts of digital libraries are important for understanding biological databases. Biological database design, development, and long-term management is a core area of the discipline of bioinformatics. Data contents include gene …

WebIn cryptography and computer science, a hash tree or Merkle tree is a tree in which every "leaf" is labelled with the cryptographic hash of a data block, and every node that is not a leaf (called a branch, inner node, or inode) is labelled with the cryptographic hash of the labels of its child nodes.A hash tree allows efficient and secure verification of the contents …

WebA történelem a múltbeli események összessége. Az emberiség múltjának tudományos ismerete. A történelem latin neve, a historia a görög ιστορία szóból származik, ami a hisztorein („kutatni, kérdezősködni”) főnevesülése, szó szerinti jelentése: „kikutatott tudás, elbeszélés, beszámoló” (ugyancsak az alapigéből képzett nomen agentis a hisztór ...

WebDatabase theory encapsulates a broad range of topics related to the study and research of the theoretical realm of databases and database management systems.. Theoretical aspects of data management include, among other areas, the foundations of query languages, computational complexity and expressive power of queries, finite model theory, database …

WebIn database systems, isolation determines how transaction integrity is visible to other users and systems.. A lower isolation level increases the ability of many users to access the same data at the same time, but increases the number of concurrency effects (such as dirty reads or lost updates) users might encounter. Conversely, a higher isolation level reduces the …