Chapter 11: Review
Question: 1. Exunreserved the deep differences betwixt a perfect ruleing regularity and a basisbase regularity ANS: Some deep differences betwixt a basisbase treatment regularity and a perfect ruleing regularity are:
Twain regularitys inclose a assembly of basis and a regular of programs which adit that basis. A DBMS coordinates twain the visible and the argumentative adit to the basis, inasmuch-as a perfect-processing regularity coordinates merely the visible adit. A DBMS reduces the total of basis duplication by ensuring that a visible behalf of basis is profitable to whole programs authorized to entertain adit to it, inasmuch-as basis written by single program in a perfect-processing regularity may not attributable attributable attributable attributable attributable attributable attributable attributable attributable be readable by another program.
A DBMS is prepared to wholeow yielding adit to basis (i. e. , queries), inasmuch-as a perfect-processing regularity is prepared to wholeow pre-determined adit to basis (i. e. , compiled programs).
A DBMS is prepared to coordinate multiple interpretationrs aditing the identical basis at the identical occasion.
A perfect-processing regularity is usually prepared to wholeow single or past programs to adit incongruous basis perfects at the identical occasion. In a perfect-processing regularity, a perfect can be adited by span programs consentaneously merely if twain programs entertain read-merely adit to the perfect.
2. Suggest three customary calling situations where referential single-mindedness avoids basis problems. ANS:
In an register command regularity, you don’t neglect an command to be deleted if there are register command items, or those items gain be orphaned. If you are assigning customers to a salesperson, referential single-mindedness would constitute safe that a customer wasn’t assigned to a salesperson that doesn’t be.
Payments in an recitaling regularity should merely be applied to an recital, and if that recital reckon changes, you neglect entries on that recital to be updated as well-behaved.
Project: 1. Exploration the Internet to perceive not attributable attributable attributable attributable attributableification about basis storage controlmats. Also do the examination on interpolitical age controlmats.
Determine whether the age controlmats interpretationd in the United States is the most base controlmat. ANS: According to my examination on the Programmers website, I ponder that we entertain manifold incongruous ways to hoard a program basis: unreserved citation which the impression has smwhole extent of merely structured basis, and basis are not attributable attributable attributable attributable attributable attributable attributable attributable attributable mitigated consentaneously by multiple interpretationrs. XML is smwhole extent of structured basis that are not attributable attributable attributable attributable attributable attributable attributable attributable attributable mitigated consentaneously or regularly. Basisbase which is enlightened structured basis or correlative adit is needed.
Need control querying and exploration is a must in the impression. Binary basis interpretation control streaming objects. Zipping is compression that may be adventitious as another rule control any of the aloft negative basisbases on servers. The interpolitical controlmat defined by ISO (ISO 8601) tries to discourse whole these problems by defining a numerical age regularity as follows: YYYY-MM-DD where * YYYY is the year [whole the digits, i. e. 2012] * MM is the month [01 (January) to 12 (December)] * DD is the day [01 to 31]
Control illustration, “3rd of April 2002”, in this interpolitical controlmat is written: 2002-04-03 In the United States, ages are unwrittenly written in the “month day, year” command. This is the most base controlmat becainterpretation it interpretationd in twain unwritten numeric age. This age controlmat was commmerely interpretationd additionally the smwhole endian controlm in the United Kingdom until the future 20th Century and can be rest in twain obsolete and later sculpture media such as the London Gazette and The Occasions, respectively.
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