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Medium 9780596002848

6.3. Software Versus Hardware

Slice ePub May 27, 2014
<p>RAID arrays are commonly implemented by host software or by a dedicated hardware array controller. Of course, the hardware RAID vendors will tell you that their hardware controllers are better, and software companies will tell you that their software products are better; although they accomplish the same function, they do have some substantial differences. </p><p> In software-based array management, the underlying physical disks are visible to the administrator, and the RAID functions are implemented via a virtual device driver. The bonus is flexibility: the RAID functionality can use any available drive, regardless of packaging or location. Arbitrary location of disks can be useful if you are trying to build an array that is resistant to systematic faults (e.g., fire or flood). One of the common criticisms of such a design is that it is slower than controller-based RAID, especially for the parity computations involved in RAID 5. While it is true that software-based arrays tend to be slower than hardware-based arrays, it is not a function of parity computational performance; a typical array controller is equivalent to a 66 MHz Intel 486 processor, which can perform eight parity computations in about fifteen cycles. A modern high-performance workstation microprocessor can complete two parity computations in every clock cycle, and has a clock rate eight times higher! In addition, the load imposed on the system for the parity computation is trivial. </p><a class="default-logo-link" href="/ebooks/362328-system-performance-tuning">See more</a>

Medium 9781449394097


Slice ePub May 27, 2014
<p>All database systems make provisions for embedding literal values in SQL statements. Text and numeric literals are usually quite simple, but there are some nuances of which you should be aware. Date and time literals tend to be more complex.</p><p>The ISO SQL standard for text literals is to enclose them in single quotes:</p><p>Use two adjacent single quotes when you need to embed a single quote in a string:</p><p>SQL will treat the two adjacent single quotes as a single quote within the literal:</p><p>Oracle Database 10<em>g</em> and higher allow you to specify alternative quoting delimiters, which are always two characters and always include leading and trailing single quotes. Introduce delimiters by prefacing them with a <code>Q</code> or a <code>q</code>. For example, to use <code>'[</code> and <code>]'</code> as delimiters, specify:</p><p>The <code>(</code>, <code>[</code>, and <code>{</code> characters are special cases in that their corresponding closing delimiters must be <code>)</code>, <code>]</code>, and <code>}</code>, respectively. Otherwise, use the same character to close the string that you use to open it:</p><a class="default-logo-link" href="/ebooks/363948-sql-pocket-guide">See more</a>

Medium 9781574412529

7. Man Swallows Goldfish while Sleepwalking, Chokes to Death

Slice PDF May 18, 2014
<p>man swallows goldfish while sleepwalking, chokes to death</p><p>M</p><p>y wife’s family cornered the market on strange death. They invented the concept. They hold the freaking patent. To look up my wife’s family tree is to see twisted branches filled with decapitations, puddle drownings, impalements, accidental hangings, circus animal attacks. You name it, it’s killed them. Her own mother—God strike me dead if I’m lying—died from a sneeze. That’s right. She sneezed and she died. I’ve seen the death certificate. Under “Cause of Death,” the doctor wrote:</p><p>Coronary failure due to sudden, extreme, involuntary expulsion of air through nasal passage. Which is a nice way of saying you died from a sneeze.</p><p>Of course, Susan never mentioned any of this to me before we got married. She seemed normal enough. There wasn’t a dark cloud following her around wherever she went. She didn’t have the Number of the Beast birthmarked behind her ear. Okay, so she was a bit uptight around the edges. She drove too slow, for one, hands always padlocked safely to the wheel in the 2 o’clock and 10 o’clock positions. But what woman isn’t uptight? What woman doesn’t drive too slow? Even when I visited her family— which boiled down to a couple of hefty aunts, an uncle, and two unmarried sisters—I never suspected a thing. We’d sit around the coffee table, speaking flawless in-law at each other. “Soooo,” her</p><a class="default-logo-link" href="/ebooks/615147-last-known-position">See more</a>

Medium 9781617830242

Floating in Space

Source: Astronauts
Slice PDF May 13, 2014

Medium 9781781606698

L’engagement émotionnel Un processus de dépersonnalisation

Source: Modigliani
Slice ePub June 09, 2014
<p>Les contours en sont gaux et prcis. La distorsion non-naturaliste de la hanche, est nanmoins harmonieuse. Elle suggre la sexualit du personnage plus quelle ne la clame. Les couleurs modres confrent une atmosphre de calme au tableau. Le personnage fminin est inond dune lumire douce, les gradations subtiles des teintes dessinent ses formes de faon si arienne quil semble flotter sur larrire-plan sombre. <em>Le Nu debout</em> (1918) porte le titre dElvire, quoique la liaison entre elle et Modigliani et dj pris fin quelques annes plus tt. Dans ses mains, le modle tient une pice de tissu froisse juste assez bas pour crer lillusion quelle est nue. Mais cette pose reprend la rserve voque par les grands nus classiques et peut-tre mme la parodie-t-elle. Sa posture est strictement gomtrique, ses seins ronds sont des hmisphres presque parfaits. Le regard vide et immobile parat audacieux et lui donne la qualit monumentale dune sculpture. Son rayonnement rotique semble avoir disparu, sa personnalit est gele. Elle ressemble une statue de pierre, non pas une vraie femme mais une forme purement physique, change en objet et dpersonnalise.</p><a class="default-logo-link" href="/ebooks/616293-modigliani">See more</a>

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