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4. A DB2 application is bound with uncommitted Read
isolation level.It issues a request that retrieves 20 rows
out of 200000 in the table.
Which of the following descrbes the rows that are locked
as a result of this request?
a. None of the rows are locked.
B.The retrieved rows are locked.
C.The last row of the result set is locked.
D.The rows not previously updated by another application
are locked.
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Answer Posted / amita sharma
a. none of the rows are locked.
Thanks;
Amita Sharma.
| Is This Answer Correct ? | 8 Yes | 1 No |
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SET is the ANSI standard for variable assignment, SELECT is not. SET can only assign one variable at a time, SELECT can make multiple assignments at once. If assigning from a query, SET can only assign a scalar value. If the query returns multiple values/rows then SET will raise an error. SELECT will assign one of the values to the variable and hide the fact that multiple values were returned (so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one) When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from it's previous value) As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does give it a slight speed advantage over SET.
