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- Suppose the deferred modification technique is used in a database.a. Is the old value part of an update log record required any more?Why or why not? b. If old values are not stored in update log records, transaction undo isclearly not feasible. How would the redo phase of recovery have to bemodified as a result?c. Deferred modification can be implemented by keeping updated dataitems in local memory of transactions and reading data items that havenot been updated directly from the database buffer. Suggest how to efficientlyimplement a data item read, ensuring that a transaction sees itsown updates.d. What problem would arise with the above technique if transactions performa large number of updates?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.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…Suppose you wish to create an audit trail of changes to the takes relation. Can the preceding implementation guarantee that updates made by a malicious database administrator (or someone who manages to get the administrator’s password) will be in the audit trail? Explain your answer.Consider a database containing personnel information, including names, addresses, and salaries of employees. Individually, the name, address, and salary information is available to a subordinate role, such as Clerk, but the association of names and salaries is restricted to a superior role, such as Administrator. With this information, how could you construct your database and tables? Design your database and draw a database schema first. Suppose that administrators wants to add a new attribute, employee start date, which is not sensitive. Where would it be? Consider not comprimising the relationship between employee and salary. Draw your new schema.
- Suppose you're interested in recording the history of changes made to the takes relation. Have any assurances been made that unauthorized database administrators (or those who manage to crack an administrator's password) would be recorded in an audit trail of modifications made by this implementation? Your reply need to include many specifics.The execution of a trigger may result in the execution of another action. The depth of layering in most database systems is limited. Explain why they would put such a restriction in place.Start a database transaction. Next time we meet, we'll be optimistic.
- In a database for an airline, "snapshot isolation" should be considered. Is a strategy that does not permit serialization a realistic alternative if airlines can enhance their overall performance?What are the benefits of using a transaction to group database operations together that need to either all complete or be rolled back so none of them complete? Here is an example of when a transaction should definitely be used to be helpful: When any bank / financial institution processes a transfer of money from one account to another account, the operations involved are always (1) to subtract a given amount of money from the source account and (2) add that same amount of money to the destination account. They have to be sure the software doing the transfer groups the above 2 required database operations in a transaction to ensure that if there is any system error/problem during these operations there is no way that money could be accidentally subtracted from an account but not added to the account it is supposed to be transferring to or customers will be very upset at the loss of money!Consider a database containing personnel information, including names, addresses, and salaries of employees. Individually, the name, address, and salary information are available to a subordinate role, such as Clerk, but the association of names and salaries is restricted to a superior role, such as Administrator.1. With this information, how could you construct your database and tables? Design your database and draw a database schema first.2. Suppose that administrators want to add a new attribute, employee start date, which is not sensitive. Where would it be? Consider not compromising the relationship between employee and salary. Draw your new schema. Could you draw a database schema diagram for both stages?