Write a program that will accept a sequence of `insert’ and `delete’ operations in dynamic table and compute & display the potential and amortized cost after each operation.
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- The following query is written in relational algebra.Project[Deposit.aid,Deposit.amount](Select[Deposit.amount>=10000]( Join[aid=aid](Account,Deposit)))Our database system includes the implementation of B+ tree indexes solely. Assume wehave indexes on primary keys of tables and an index on Deposit.amount.Which join algorithm reads less number of pages from the disk: sort-merge join or indexnested loops join?Consider the query:select *from r, swhere upper(r.A) = upper(s.A);where “upper” is a function that returns its input argument with all lowercaseletters replaced by the corresponding uppercase letters. Some database systems would use a (block) nested-loop join for this query, which can be very inefficient. Briefly explain how hash-join or merge-join can be used for this query.The following query is given as an expression of relational algebra.Project[Projects.jid,Projects.name,Orders.price](Join[Projects.jid=Orders.jid]( Select[budget>500.000](Projects), Select[date>’1/1/2010’](Orders)))All tables have hash indexes defined on keys. We have B+ trees defined forOrders.date and Projects.budget, and a hash index on Orders.jid.Suppose our DBMS includes the implementations of the index nested loops join and thesort-merge join. Find a query plan that reads the least number of blocks from the disk.Write all assumptions.
- What happens to the existing rows of a table if the DEFAULT value of a column is changed?How exactly does one go about creating a clustered index, and what are the key differences between a clustered index and a sparse index in general?What are the key differences between a clustered index and a sparse index?
- How does one go about making a clustered index as opposed to a sparse one, and what properties set it apart from a sparse index?write MySQL functions to accomplish the following tasks: A:Delete the order whose number is stored in I_ORDER_NUM. B: Change the date of the order whose number is stored in I_ORDER_NUM to the date currently found in I_ORDER_DATE. C: Retrieve and output the item number, description, storehouse number, and unit price of every item in the category stored in I_CATEGORY.Given R ( A int, B int, C int ). Consider this select statement: Select R1.A, R1.B, R1.C from R R1 join R R2 on R1.A = R2.B where R1.A mod 2 = 0 and R2.B = R2.C Show the EXPLAIN PLAN for the table and statement Identify one or more indexes that might improve performance. Show the EXPLAIN PLAN and describe if you have made improvements in the execution.
- What is the difference between clustered index and sparse index?Specifically, we utilized the "single row" method to display a single row from a database. Scalar function or vector function? Which is preferable?Assume you have a database table with 10,000 records and you want to retrieve all records that satisfy a certain condition using a binary search algorithm. On average, how many comparisons would be needed to retrieve all the records?