Database Solutions (2nd Edition) by Thomas Connolly, Carolyn Begg

By Thomas Connolly, Carolyn Begg

Are you accountable for designing and developing the databases that hold your enterprise operating? Or are you learning for a module in database layout? if that is so, Database strategies is for you! This totally revised and up to date version will make the database layout and construct approach smoother, swifter and extra reliable.

Recipe for database success
Take one RDMS ¿ any of the most important advertisement items will do: Oracle, Informix, SQL Server, entry, Paradox
Add one thorough studying of Database strategies while you are an green database clothier, or one recap of the technique when you are an outdated hand
Use the layout and implementation frameworks to devise your timetable, use a standard information version that matches your requisites and adapt as worthy

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4 Describe the five components of the DBMS environment and discuss how they relate to each other. 5 Describe the problems with the traditional two-tier client–server architecture and discuss how these problems were overcome with the three-tier client–server architecture. 6 Describe the functions that should be provided by a modern full-scale multi-user DBMS. 6, which ones do you think would not be needed in a standalone PC DBMS? Provide justification for your answer. 8 Discuss the advantages and disadvantages of DBMSs.

Properties of relational tables are: each cell contains exactly one value, column names are distinct, column values come from the same domain, column order is immaterial, record order is immaterial, and there are no duplicate records. A superkey is a set of columns that identifies records of a table uniquely, while a candidate key is a minimal superkey. A primary key is the candidate key chosen for use in identification of records. A table must always have a primary key. A foreign key is a column, or set of columns, within one table that is the candidate key of another (possibly the same) table.

For example, some simple transactions for the StayHome video rental company might be to add a new member of staff to the database, to update the salary of a particular member of staff, or to delete a member from the register. A more complicated example might be to delete a manager from the database and to reassign the branch that he or she managed to another member of staff. In this case, there is more than one change to be made to the database. If the transaction fails during execution, perhaps because of a computer crash, the database will be in an inconsistent state: some changes will have been made and others not.

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