Computers and Technology, 07.03.2020 02:34, jamarengle2
The DDBMS Scenario
Specify the minimum type(s) of operation(s) the database must support (remote request, remote transaction, distributed transaction, or distributed request) in order to perform the following operations: To answer the following questions, remember that the key to each answer is in the number of different data processors that are accessed by each request/transaction. First, identify how many different DP sites are to be accessed by the transaction/request. Next, remember that a distributed request is necessary if a single SQL statement is to access more than one DP site.
Use the following summary:
Operation
Number of DPs
1
>1
Request
Remote
Distributed
Transaction
Remote
Distributed
At site C:
a. SELECT * FROM PRODUCT;
b. SELECT * FROM INVOICE WHERE INV_TOTAL < 2000;
c. SELECT * FROM PRODUCT WHERE PROD_QOH < 25;
d. BEGIN WORK;
UPDATE CUSTOMER
SET CUS_BALANCE = CUS_BALANCE + 200
WHERE CUS_NUM='12934';
INSERT INTO INVOICE(INV_NUM, CUS_NUM, INV_DATE, INV_TOTAL)
VALUES ('867541', '14678',
Answers: 1
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The DDBMS Scenario
Specify the minimum type(s) of operation(s) the database must suppor...
Specify the minimum type(s) of operation(s) the database must suppor...
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