Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / s
The obvious benefit is savings in disk space. Thus reduced
row length means more rows per page which means lesser
getpages. Fewer getpages mean less locks hence less CPU
costs and less I/O. Use of VARCHAR reduces the number of
bytes passed between DB2 and application. There is a CPU
cost associated with each byte of data moved.
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
While unloading huge amount of data from table. Suddenly job failed some error. Imagine 1M data unloading, In that 90% data unloaded only 10% left, So if want to unload the rest 10% what needs to be done? Whether do i need to start from top or anything ?
in my project..TEST is db2 8.1 version In PROD it is 7.1 if i do REORG in TEST.. can I use the same REORG jcl with out modification in PROD region (this is DB2 8.1 )? if not, what modification i need to do in my REORG control card?
Why select is not preferred in embedded sql programs?
What is database alias db2?
What is db2 look?
Outputs of explain are with matchcols = 0. What does this signify?
How to compare data between two tables in db2?
How do I delete a table in database?
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.
DB2 can implement a join in three ways using a merge join, a nested join or a hybrid join. Explain the differences?
What is deadlock in db2?
What is dbrm in db2 database?
Why do we need reorg in db2?
What is runstats utility in db2?
Define buffer pool.
