Search results
Results from the WOW.Com Content Network
SQLAlchemy is an open-source Python library that provides an SQL toolkit (called "SQLAlchemy Core") and an Object Relational Mapper (ORM) for database interactions. It allows developers to work with databases using Python objects, enabling efficient and flexible database access.
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
MapReduce is a programming model and an associated implementation for processing and generating big data sets with a parallel and distributed algorithm on a cluster. [1] [2] [3]A MapReduce program is composed of a map procedure, which performs filtering and sorting (such as sorting students by first name into queues, one queue for each name), and a reduce method, which performs a summary ...
Stack Exchange uses IIS, SQL Server, [62] and the ASP.NET framework, [62] all from a single code base for every Stack Exchange site (except Area 51, which runs off a fork of the Stack Overflow code base). [63] Blogs formerly used WordPress, but they have been discontinued. [64] The team also uses Redis, HAProxy and Elasticsearch. [62]
All three types of parallelism usually operate combined in a single job or task. An additional difficulty comes with making sure that the data being uploaded is relatively consistent. Because multiple source databases may have different update cycles (some may be updated every few minutes, while others may take days or weeks), an ETL system may ...
Linux is the leading operating system on servers (over 96.4% of the top one million web servers' operating systems are Linux), [48] leads other big iron systems such as mainframe computers, [clarification needed] [49] and is used on all of the world's 500 fastest supercomputers [h] (as of November 2017, having gradually displaced all competitors).
SQL Anywhere Server is a high performing and embeddable relational database-management system that scales from thousands of users in server environments down to desktop and mobile applications used in widely deployed, zero-administration environments.
HTML equivalent: <hr /> (which can be indented, whereas ---- always starts at the left margin.) Table of contents Further information: WP:TOC When a page has at least four headings, a table of contents (TOC) will automatically appear after the lead and before the first heading. The TOC can be controlled by magic words or templates: __FORCETOC__ forces the TOC to appear at the normal location ...