Answer Posted / thiruvenkata varaga moorthy
After a Bulk Load of the Table or Table Space by means of a
DB2 Load Utility, we need to go for an Image Copy so as to
restore the system in case of some unexpected situations.
Generally, DB2 system itself will expect such an imagecopy
and will prompt the message in the output saying 'Image
Copy Required', 'Table Space Remains in Copy Pending State'.
It is upto the wish of the programmer either to go for an
Image Copy or to cancel the Copy Pend state by means of the
Repair set.
| Is This Answer Correct ? | 8 Yes | 4 No |
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Is it possible to alter a table – for example adding a column, when another user is accessing or updating some columns?
Explain about cursor stability?
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.
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