A transaction database contains ten transactions shown below and minimum_support = 30%. Using A-priori, find all frequent itemsets that contain item i. How many frequent itemsets that contain i do we have? %3D
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- A database has four transactions. Let min_support=60% and min conf=80% TID date Items_bought T100 10/15/99 {K,A,D,B} T200 10/15/2000 {D,A,C,E,B} T300 10/19/2000 {C,A,B,E} T400 10/22/99 {B,A,D} Find all frequent itemset using Apriori and FP-growth respectively, Compare the efficiency of two mining processes List all strong association rules (with support s and confidence c).a) Given the set of transactions in the table, compute the support for itemsets {e}, {b, d), and {b, d, e} by treating each transaction ID as a market basket. Transaction ID 0001 0024 0012 0031 0015 0022 0029 0040 0033 0038 Items Bought {a, d, e} {a,b,c, e} {a, b, d, e} {a, c, d, e} {b, c, e} {b, d, e} {c,d} {a,b,c} {a, d, e} {a,b, e} b) Use the results in part (a) to compute the confidence for the association rules {b, d} →→ {e} and {e}-{b, d).Course: Principles of Database please solve it within 30 minutes. please please, pleaseThank you Single Choice Questions 11. Given a relation R and a condition f for selecting from relation R, the correct relational algebraic expression is ( ). A、R X R B、 R ⋈ R C、sf(R) D、 ∏f(R) 12. If relations R and S have a common attribute set Y, when executing , tuples that do not have matching values on attribute Y will be discarded. To avoid discarding those tuples, which operation should be used? ( ) A. Aggregation. B. Grouping. C. Outer union. D. Outer join. 13. To address the "lost update" problem, a transaction must obtain ( ) before updating a data set. A. Shared lock (S-lock). B. Exclusive lock (X-lock). C. Shared lock (S-lock) and exclusive lock (X-lock). D. Shared lock (S-lock) or exclusive lock (X-lock). 14. If, during the system operation, data stored on external storage is…
- no relatIYCS 3. Give a Z expression for the set of all people in the database who have no siblings in the database. arations through which2. For a transaction database such as follows, there exists a hierarchy on categories of items: TID Items apple, lamb, rice apple, sugar, rice beef, rice, apple apple, pear, sugar rice 100 200 Fruit Food 300 аpple рear meat rice sugar 400 500 lamb beef apple, pear beef, rice 600 700 (a) Find all frequent itemsets using the basic algorithm given in the lecture (minimum support = 3 transactions). (b) Generate all generalised association rules (minimum confidence = 90%)Let relations r1(A, B, C) and r2(C, D, E) have the following properties: r1 has20,000 tuples, r2 has 45,000 tuples, 25 tuples of r1 fit on one block, and 30tuples of r2 fit on one block. Estimate the number of block transfers and seeksrequired using each of the following join strategies for r1 ⋈ r2: Nested-loop join.
- Problem 8-10 use the same database. Let a database application have the following entities Sales = (Customers, Salesperson, Retail Order, Items), which contains the information that a salesperson sells multiple items (tables, computers,...) to customers. There are many customers. There are many salesmen. There are many items. For example, John sells to Joe, Smith sells to Jane, The "Salesperson" will sale many times. The "Customer" can come back and buy items many times The "Retail Order" specifies which Salesperson sell to which customer. In each "Retail_Order", many items (tables, computers,...) can be sold Hint: This is very similar to one of your homework What is the relationship between Retail_Order and Items? One-to-many relationship None of the above One-to-one relationship Many-to-many relationshipThe statement "using no index at all is probably a better idea then using a tree-based index" is true if: Select one: a. The indexed relation is fairly static O b. The indexed relation is so small it can fit in the main memory buffer c. The statement is incorrect, i.e., it is always beneficial to use an index O d. Alternative (a) is correct only if one assumes no bufferingCase Study: Database System for Teaching institution Assume you have been contracted by a teaching institution to develop a database systemto keep track of student registration and accommodation records.The institution courses are offered by instructors during physical classes. Depending onthe student’s IQ, there are no limitations to how many courses a student can enroll in.administrators are responsible for student accommodation. This institution owns anumber of rooms for accommodation and each student is given a shared room key afterenrollment. Each room has furniture attached to it. question- draw a single ER diagram to represent the data requirements for the project based on Chen Notation. use any Online editor to create the that supports Chen Notations to create the model?
- 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…JoziCleaners is local cleaning service that is looking to upgrade their current operations by making use of a database to keep track of the teams, houses, clients and billings of each client per/week. Each house is cleaned by one or more teams. A team goes out to a particular house on a certain day of the week. Each cleaning team has a team leader. Every cleaner eams R150 per day, except the team leader who earns a unique amount. The report that the JoziCleaners' manager produced in Microsoft Excel is illustrated as a spreadsheet in Figure 1 below. Day Client Client Name Team Members Team Leader Leader Total Code ID Wage Monday Aeliana Gebahard T3 6. Jaymes Merrickson R 350 R 850 C10 Alfher Dareia T1 Geoffrey Glover R 250 R 750 C8 Felina Diodotus T2 Elmer Victorson R 300 R 700 Brutus Sigihild Sigibert Quirinus Brutus Sigihild C9 T4 Norris Mamadou R 400 R1 000 Tuesday CS T3 Jaymes Merrickson R 350 R 850 C9 T2 5 Elmer Victorson R 300 R 700 Alfher Dareia Duncan Gardyner Geoffrey Glover…Select from below ALL statements that are true. Select one or more: a. Adding locking and unlocking statements (in arbitrary ways) to transactions is sufficient to assure database consistency in concurrent schedules. b. A conflict serializable schedule assures database consistency. c. The "B" in "B+-tree" stands for "Binary". d. The search key field/attribute of a primary index for a table does NOT have to be the primary key of the table. e. If an index is a sparse index, it MUST BE a primary index. f. It is a good idea to allow ONLY SERIAL schedules because they guarantee database consistency.