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What Functions Are Common to Most Database Management Systems? Database management systems (DBMSs) are available for many sizes and types of computers. Whether designed for a small or large computer, most DBMSs perform common functions. A data dictionary, sometimes called a repository, contains data about each fi le in the database and each field in those fi les. A DBMS offers several methods to retrieve and maintain data in the database, such as query languages, query by example, forms, and report generators. A query language consists of simple, English-like statements that allow users to specify the data to display, print, or store. Query by example (QBE) has a graphical user interface that assists users with retrieving data. A form, sometimes called a data entry form, is a window on the screen that provides areas for entering or modifying data in a database. A report generator, also called a report writer, allows users to design a report on the screen, retrieve data into the report design, and then display or print the report. To supply security, most DBMSs can identify different levels of access privileges that define the actions a specific user or group of users can perform for each fi eld in a database. If a database is damaged or destroyed, a DBMS provides techniques to return the database to a usable form. A backup is a copy of the database. A log is a listing of activities that modify the contents of the database. A recovery utility uses the logs and/or backups to restore the database using roll forward or rollback techniques. In a roll forward, also called forward recovery, the DBMS uses the log to reenter changes made to the database since the last save or backup. In a rollback, also called backward recovery, the DBMS uses the log to undo any changes made to the database during a certain period. Continuous backup is a backup plan in which all data is backed up whenever a change is made.
Calculate the mass of the green house gas and ozone depleting substance CFC-11 (chemical Formula = CCl3F) in the atmosphere. Use units of GtC (giga tonnes carbon)
A rotating viscometer consists of two 0.6 m long co-axial cylinders with Ø = 0.3 m and 0.32 m respectively. (The gap between the cylinders is 1 cm.) The external cylinder is fixed and the inner cylinder is rotating at 2.5 rpm.
The missing 5 kg/s water is added to the FWH from a 20?C, 500 kPa source. Find the extraction flow rate needed to cover both the FWH and the steam supply. Find the total turbine power output.
A 75-lb block is supported by the spring arrangement shown. The block is moved vertically downward from its equilibrium position and released. Knowing that the amplitude of the resulting motion is 2 in.,
Draw the shear and bending moment diagrams for the beam AB, and determine the maximum absolute values of the shear and bending moment.
Think as though you are the supply chain manager. What else would you recommend to leaders or managers in your selected supply chain?
A rectangular well-mixed aeration lagoon is 60m long, 5m wide, and 2m deep. It receives 400 cubic meters/day of wastewater with a BOD5 of 336mg BOD5/L for treatment. The biodegradation rate constants for the wastewater are yield coefficient = 0.8mg V..
Using 2DFlowPlus, investigate the flow pattern resulting by addition of one vortex (K = -0.1) at (X = +3.5, Y = 0) and another (K = +0.1) at (X = +4.5, Y = 0). Describe in words the physical nature of the flow.
You are planning a Polaris observation at latitude 42 degrees North when the star is at or near upper culmination. You want to know the error in azimuth that will result from a 1 min timing error. You know that the meridian angle, t, is exactly 0 deg..
The exterior and interior walls are of concrete block. The roof is constructed of bar joists covered with a steel roof deck, rigid insulation, and built-up roofing.
Discuss the type of hardening rule you would use to model the cyclic constitutive behavior of the composite.
Design a divide-by-2 (that is, l-bit) counter using only one D flip-flop. You may also include any combinational logic you wish in your design, butry to minimize the additional logic used.
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