1/1/2024 0 Comments Database sharding postgresql![]() ![]() If you're reading this article, you're probably already familiar with other relational database management systems, such as MySQL, SQL Server, etc. Extensibility, including the ability to define your own functions.Support for Multiversion Concurrency Control (MVCC), guaranteeing that reading data doesn't conflict with writing data, even between concurrent operations.Support for NoSQL queries in addition to relational queries, i.e.Object-relational principles, including the ability to inherit characteristics from tables.TEXT, INTEGER, etc), as well as more advanced data types such as arrays and custom data types. Support for the usual data types (i.e.Its documentation claims many features, such as: In other words, it is the intermediary software between applications and databases that writes, reads, and modifies data organized into tables. We use Relational Database Management Systems.Ī Relational Database Management System (RDBMS) is a piece of software that manages and modifies database relations in terms of tables. How, then, can we interact with data using SQL? Or create tables in a database? The SQL language has a set of standard functions, such as SELECT, INSERT, and DELETE. It is a language standard for interacting with databases through data storage, retrieval, and modification. SQL stands for Structured Query Language. SQL and Relational Database Management Systems To talk about that, we first need to talk SQL and Relational Database Management Systems. Discuss certain systems in which PostgreSQL proves more useful.Illustrate useful features in PostgreSQL.Provide some brief comparisons to other alternatives, such as MySQL.Give a brief overview of the PostgreSQL relational database management system. ![]()
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1/1/2024 0 Comments Wireless network radar![]() ![]() The 1505 APs can use 802.11g, sharing it with the client access. This is instead of using 802.11a radio as backhaul. In case that severe radar interference is detected, it is still possible to build the network using 1505 APs. Also, in harbors, it is possible that passing or incoming ships might have radar that affects the mesh network, which might not be present during the survey phase. It is advisable that before you plan and install, contact the local authorities in order to obtain information if there is any known radar installation nearby, such as weather, military, or an airport. The main impact is that the full sector will go one minute on silent mode after channel change (mandated by DFS), but it has the advantages that it prevents MAPs to become isolated if they detect radar, but its parent not. The feature of “full sector DFS mode” is available on mesh releases 4.0.217.200 and later. After this time, they resume normal operation. All devices after going into the new channel, go silent for one minute, to detect for possible radio signals on the new channel. If a RAP sees the radar event, it notifies all MAPs for a channel change. ![]() The RAP then triggers a full sector channel change (RAP plus all its dependant MAPs). If a MAP sees the radar on the current channel, it notifies RAP of the radar detection. This causes this section of the mesh network to go down, as RAP has to change channel, and all the MAPs have to search for new parent location. If a RAP sees the radar event, it goes silent for one minute, and then selects a new channel from the 802.11a Auto RF channel list (if currently joined to controller). If no other parent is available in another channel (no redundancy), the MAP remains off network for the 30 minutes of the DFS timer. This situation can occur if the detecting MAP is closer or in line of sight of the radar, and the other APs are not. ![]() If the parent does not detect the radar, it remains on the channel and is not visible for the MAP that did detect it. The previous channel is marked as not usable for 30 minutes. Then, the MAP starts to scan channels for a suitable new parent to associate again to the mesh network. If a mesh access point (MAP) sees the radar on the current channel, it goes silent for one minute. This depends on where the radar is detected and on the state of “full sector DFS mode” configuration setting (in case it is disabled): The effects of radar signal over a wireless mesh network with 802.11a backhaul can be different. This is dictated by Federal Communications Commission (FCC) and European Telecommunications Standards Institute (ETSI) standards, and is established to allow the sharing of the 5 GHz spectrum between wireless LAN (WLAN) and military or weather radars that use the same frequencies. If during operation, an access point (AP) detects a radar event over the Radio Frequency (RF) channel that the network backhaul uses, it must immediately change to another available RF channel. It is important to validate the presence of radar on any wireless mesh deployment. The objective is to provide a mechanism to check for possible radar signals that can affect a wireless mesh network that uses 802.11a as backhaul links. It covers both 15 mesh access point families. One based on 4.0.217.200 image, the other using newer functionality on the mesh released, in particular 4.1.192.17M. This document offers two methods to scan for radar signals across 802.11a outdoor channels before deployment of mesh networks. ![]() 1/1/2024 0 Comments Minimalist abstract line art![]() ![]() Yves Klein had painted monochromes as early as 1949, and held the first private exhibition of this work in 1950-but his first public showing was the publication of the Artist's book Yves: Peintures in November 1954. Minimalism as a formal strategy has been deployed in the paintings of Barnett Newman, Ad Reinhardt, Josef Albers, and the works of artists as diverse as Pablo Picasso, Yayoi Kusama, Giorgio Morandi, and others. In a more general sense, minimalism as a visual strategy can be found in the geometric abstractions of painters associated with the Bauhaus, in the works of Kazimir Malevich, Piet Mondrian and other artists associated with the De Stijl movement, and the Russian Constructivist movement, and in the work of the Romanian sculptor Constantin Brâncuși. Minimalism in visual art broadly Kazimir Malevich, Black Square, 1915, oil on canvas, 79.5 x 79.5 cm, Tretyakov Gallery, Moscow Judd's work was showcased in 1964 at Green Gallery in Manhattan, as were Flavin's first fluorescent light works, while other leading Manhattan galleries like Leo Castelli Gallery and Pace Gallery also began to showcase artists focused on minimalist ideas. Dissatisfied with the intuitive and spontaneous qualities of Action Painting, and Abstract Expressionism more broadly, Minimalism as an art movement asserted that a work of art should not refer to anything other than itself and should omit any extra-visual association. Minimalism was in part a reaction against the painterly subjectivity of Abstract Expressionism that had been dominant in the New York School during the 1940s and 1950s. Minimalism in sculpture can be characterized by very simple geometric shapes often made of industrial materials like plastic, metal, aluminum, concrete, and fiberglass these materials are usually left raw or painted a solid colour. Minimalism in painting can be characterized by the use of the hard edge, linear lines, simple forms, and an emphasis on two dimensions. Examples of artists working in painting that are associated with Minimalism include Nassos Daphnis, Frank Stella, Kenneth Noland, Al Held, Ellsworth Kelly, Robert Ryman and others those working in sculpture include Donald Judd, Dan Flavin, David Smith, Anthony Caro and more. Minimalism in visual art, sometimes called "minimal art", "literalist art" and "ABC Art", refers to a specific movement of artists that emerged in New York in the early 1960s in response to abstract expressionism. Main article: Minimalism (visual arts) Tony Smith, Free Ride, 1962, 6'8 x 6'8 x 6'8 ![]() The word was first used in English in the early 20th century to describe a 1915 composition by the Soviet painter Kasimir Malevich, Black Square. ![]() It has accordingly been used to describe the plays and novels of Samuel Beckett, the films of Robert Bresson, the stories of Raymond Carver, and the automobile designs of Colin Chapman. The term minimalist often colloquially refers to anything or anyone that is spare or stripped to its essentials. Minimalism in music often features repetition and gradual variation, such as the works of La Monte Young, Terry Riley, Steve Reich, Philip Glass, Julius Eastman and John Adams. The movement is often interpreted as a reaction against abstract expressionism and modernism it anticipated contemporary postminimal art practices, which extend or reflect on minimalism's original objectives. Prominent artists associated with minimalism include Donald Judd, Agnes Martin, Dan Flavin, Carl Andre, Robert Morris, Anne Truitt and Frank Stella. In visual arts, music and other media, minimalism is an art movement that began in post– World War II in Western art, most strongly with American visual arts in the 1960s and early 1970s. 4A on Strada Dimitrie Racoviță, Bucharest, Romania, 2017, by Corina Dîndărean Top: Untitled, by Donald Judd, concrete sculpture, 1991, Israel MuseumĬentre: The Zollverein School of Management and Design Essen, Germany, 2005–2006, by SANAAīottom: House no. ![]() 1/1/2024 0 Comments Call of duty 2 prices![]() ![]() Purchase the Call of Duty®: Modern Warfare® II Vault Edition and get the Red Team 141 Operator Pack, FJX Cinder Weapon Vault, 10 hours of 2XP, 10 hours of Weapons 2XP. Now featuring the brand-new map, Al Mazrah. Bloomberg’s report says it will be a Modern Warfare 2 game, which Activision has not confirmed. Drop in, armor up, loot for rewards and battle your way to the top. Activision said in its previous two quarterly investor calls that the franchise would get a stand-alone premium title in 2023. The iconic first-person shooter game is back Cross play, free maps and modes, and new engine deliver the largest technical leap in Call of Duty history. 27): The headline on this story was changed to better reflect the newest developments as regards to Call of Duty’s 2023 launch. The tech giants merger with the Call of Duty owner would be the biggest deal of its kind in gaming industry history. Infinity Ward, Treyarch, Sledgehammer, and Activision Blizzard on the whole are in enveloped in a $68.7 billion attempted acquisition by Microsoft, announced last year, that regulators in the United Kingdom, United States, and European Union are holding up over antitrust concerns.Ĭorrection (Feb. Package » Call of Duty: Modern Warfare 2 Bundle. The Call of Duty franchise will observe its 20th anniversary in 2023. Experience classic Call of Duty combat, the bonds of camaraderie, and the unforgiving. Land in Normandy on D-Day and battle across Europe through iconic locations in history’s most monumental war. The paid expansion envisioned for Call of Duty: Modern Warfare 2 is instead a “premium Call of Duty game” now, according to an Activision spokesperson, with a single-player campaign and new multiplayer maps, Bloomberg says. Call of Duty® returns to its roots with Call of Duty®: WWIIa breathtaking experience that redefines World War II for a new gaming generation. Activision-owned Treyarch, Infinity Ward, and Sledgehammer Games had split production on the series, on a three-year development cycle, going back to 2014’s Call of Duty: Advanced Warfare.īecause of that workload hiccup, Activision at first planned to go through 2023 without a mainline Call of Duty entry, pushing Treyarch’s next regularly scheduled Call of Duty game to 2024. ![]() Get the best Call of Duty Modern Warfare 2 sales, deals, and discount voucher codes on. compares the lowest prices of Call of Duty Modern Warfare 2 on PS4 from the digital download market. This all goes back to 2020, when development difficulties moved Treyarch’s turn in Call of Duty’s three-studio rotation up a year, and brought us Call of Duty: Black Ops Cold War a year ahead of schedule. The best price for Call of Duty Modern Warfare 2 on PS4 is 44.86, found at BuyGames among 7 trusted stores offering 8 different prices. Instead of skipping a year, Activision’s Call of Duty franchise will get a full-price, stand-alone video game this fall, Bloomberg reports - but it’ll be a continuation of last year’s rebooted Call of Duty: Modern Warfare 2.īloomberg’s Jason Schreier noted in Thursday’s report that Activision’s plans for the series originally called for a “premium expansion” to Modern Warfare 2, rather than a full new game, sometime in 2023. ![]() |
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