A dark spacetime grid stretches silently across a cosmic void. As a glowing sphere glides through it, the grid bends and ripples around its path, visualizing the curvature of spacetime from Einstein’s General Relativity. Subtle 3D rotation and faint starlight enhance the scene’s depth, revealing gravity as the graceful warping of the universe’s fabric.
SIGQUIT
This is the Immediate Shutdown mode. The server will send SIGQUIT to all child processes and wait for them to terminate. If any do not terminate within 5 seconds, they will be sent SIGKILL. The master server process exits as soon as all child processes have exited,…
SIGINT
This is the Fast Shutdown mode. The server disallows new connections and sends all existing server processes SIGTERM, which will cause them to abort their current transactions and exit promptly. It then waits for all server processes to exit and finally shuts down. If…
SIGTERM
This is the Smart Shutdown mode. After receiving SIGTERM, the server disallows new connections but lets existing sessions end their work normally. It shuts down only after all of the sessions terminate. If the server is in online backup mode, it additionally waits…
Cartesian Product
The cartesian product of two sets A and B is defined as a set formed by all the possible ordered pairs of elements from A and B, such that the first element comes from set A and the second element comes from set B. The cartesian product is denoted as A × B. Let a and…
Ordered Pairs
An ordered pair is a 2-tuple formed by taking two elements (generally numbers but can be alphabets, characters, words or symbols). The general form of representation is (a, b) where a and b represent two distinct objects. The important thing with ordered pairs is that…
Tuples
Tuples in Relations and their examples
Relations & Sets
A Relation from set A to set B is defined as a set of ordered pairs formed from the elements of set A and B. In other words, a relation is a subset of the cartesian product of sets A and B. The subset is derived by establishing predicate filter(s) or criteria stating…
Chemical Fertilizer vs. Organic Fertilizer
A popular topic among agriculture specialists and home gardeners these days is the furore on organic fertilizer vs. chemical fertilizer. Now each fertilizer certainly has its pros and cons, but before we delve deeper into that, let us first make a few…
Liquid Organic Fertilizer
Using organic fertilizers is a widely accepted practice in the agricultural industry. Farmers use them to cultivate their fields and row crops, winemakers utilize them for growing grapes, and horticulturists apply a liberal dose of these during the landscaping of…
Longest Rivers of the World
RANKRiverRegionLength (KM/MILES)1The NileEast and North Africa(7,088 KM / 4,404 MILES)2AmazonSouth America (Peru, Colombia, Brazil )(6,992 KM / 4,345 MILES)3YangtzeChina(6,418 KM / 3,988 MILES)4MississippiUSA & Canada(6,275 KM / 3,902 MILES)5Yenisey…