If the state of the database no longer reflects a real state of the world that the database is supposed to capture, then such a state is called a(n). A Consistent state. B Parallel state. C Durable state. D Inconsistent statc. A
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- Design an ER schema for keeping track of information about votes taken in the U.S. House of Representatives during the current two-year congressional session. The database needs to keep track of each U.S. STATE's Name (e.g., 'Texas', 'New York', 'California') and include the Region of the state (whose domain is {'Northeast', 'Midwest', 'Southeast', 'Southwest', 'West'}). Each CONGRESS_PERSON in the House of Representatives is described by his or her Name, plus the District represented, the Start_date when the congressperson was first elected, and the political Party to which he or she belongs (whose domain is {'Republican', 'Democrat', 'Independent', 'Other'}). The database keeps track of each BILL (i.e., proposed law), including the Bill_name, the Date_of_vote on the bill, whether the bill Passed_or_failed (whose domain is {'Yes', 'No'}), and the Sponsor (the congressperson(s) who sponsored that is, proposed the bill). The database also keeps track of how each congressperson voted on…If the state of the database no longer reflects a real state of the world that the cdatabase is supposed to capture, then such a state is called a(n). Consistent state. B Parallel state. C Durable state. D Inconsistent state. ADesign an ER schema for keeping track of information about votes taken in the U.S. House of Representatives during the current two-year congressional session. The database needs to keep track of each U.S. STATE’s Name (e.g., ‘Texas’, ‘New York’, ‘California’) and include the Region of the state (whose domain is {‘Northeast’, ‘Midwest’, ‘Southeast’, ‘Southwest’, ‘West’}). Each CONGRESS_PERSON in the House of Representatives is described by his or her Name, plus the District represented, the Start_date when the congressperson was first elected, and the political Party to which he or she belongs (whose domain is {‘Republican’, ‘Democrat’, ‘Independent’,‘Other’}). The database keeps track of each BILL (i.e., proposed law), including the Bill_name, the Date_of_vote on the bill, whether the bill Passed_or_failed (whose domain is {‘Yes’, ‘No’}), and the Sponsor (the congressperson(s) who sponsored—that is, proposed—the bill). The database also keeps track of how each congressperson voted on…
- To access a database, we need to open a connection to it first and close it once our job is done. Connecting to a database depends on the type of the target database and the database management system (DBMS). For example, connecting to a SQL Server database is different from connecting to an Oracle database. But both these connections have a few things in common: •They have a connection string •They can be opened•They can be closed•They may have a timeout attribute (so if the connection could not be opened within the timeout, an exception will be thrown).Your job is to represent these commonalities in a base class called DbConnection. This class should have two properties: ConnectionString : stringTimeout : TimeSpanA DbConnection will not be in a valid state if it doesn’t have a connection string. So you need to pass a connection string in the constructor of this class. Also, take into account the scenarios where null or an empty string is sent as the connection string. Make sure to…A database is in 3rd NF if A. It is 2ndNF and in 1stNF B. It is in 2ndNF and all non-key fields depend on all key fields C. It is in 2nd NF and all non-key fields depend only on one key field D. It is in 2ndNF and all non-key fields may depend indirectly on all key fields Justify your answer with explanationsThe InstantRide Management team founded a new team for car maintenance. The new team is responsible for the small maintenance operations for the cars in the InstantRide system. The main idea is to take actions faster and minimize the time spent for the maintenance. Therefore, the Car Maintenance team wants to store MAINTENANCE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team.
- The InstantRide Management team founded a new team for car maintenance. The new team is responsible for the small maintenance operations for the cars in the InstantRide system. The main idea is to take actions faster and minimize the time spent for the maintenance. Therefore, the Car Maintenance team wants to store MAINTENANCE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team. Create a new table to store car maintenance types.Consider the following information about a patient database: • A patient is identified by patient id, and admission date. • A patient must be either an Emergency patient or a resident patient. • We must record the checkback date for Emergency patient. • Only resident patient is assigned to one room. Room has a unique number, degree, and floor number. • For each room there are a number of beds each of which has a bed number, specification. If a room is deleted, you need not keep track of its beds any longer. • Both emergency patient and resident are cared for by a responsible Doctor. Doctor is identified by Doctor number. For each Doctor, the name, several specialty, and years of experience must be recorded. • Doctors prescribe medicine for patients. Medicine is identified by trade name that has scientific name and formula. The medicine depends on another medicine to be taking before. • A doctor could prescribe one or more drugs for several patients, and a patient could obtain…Describe the concept of "lazy loading" in the context of database connectivity.
- Q. The database interface of a library allows searching only for a single attribute (such as Titleor Author ) in each query. Your friend decided to extend it's functionality and wrote an algorithm that allowssearching for books that satisfy multiple predicates over single attributes in conjunction. He tells you the algorithmreuses the already implemented query functionality and works by intersecting the results ( book id's ) of queriesover single attributes.Which of the following assumptions on your friend's algorithm are plausible?a) Its worst-case run-time necessarily increases exponentially with respect to the number of attributes in thequery.b) Its worst-case run-time depends on the length of the longest result of the single-attribute queries.c) It might be implemented using an join.d) It might be implemented using sorting.Consider the following information about a patient database: A patient is identified by patient id, and admission date. A patient must be either an Emergency patient or a resident patient. We must record the checkback date for Emergency patient. Only resident patient is assigned to one room. Room has a unique number, degree, and floor number. For each room there are a number of beds each of which has a bed number, specification. If a room is deleted, you need not keep track of its beds any longer. Both emergency patient and resident are cared for by a responsible Doctor. Doctor is identified by Doctor number. For each Doctor, the name, several specialty, and years of experience must be recorded. Doctors prescribe medicine for patients. Medicine is identified by trade name that has scientific name and formula. The medicine depends on another medicine to be taking before. A doctor could prescribe one or more drugs for several patients, and a patient could obtain prescriptions from…Suppose you are asked to design a club database system based on the following information. Each student has a unique student id, a name, and an email; each club has a unique club id, a name, a contact telephone number, and has exactly one student as its president. Each student can serve as a president in at most one of the clubs, although he/she can be the members of several clubs. Clubs organize activities and students can participate in any of them. Each activity is described by a unique activity id, a place, a date, a time and those clubs that organize it. If an activity is organized by more than one club, different clubs might contribute different activity fees.QuestionDraw an E-R diagram for the system according to the above description.