Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / andank
The Answer # 1 is perfect. When Lock esculation happens,
DB2 issues a warning message, DSNI031I.
Please beaware Lock Escalation and Lock Promotion are two
different concepts.
Lock promotion is the action of exchanging one lock on a
resource for a more restrictive lock on the same resource,
held by the same application process.
| Is This Answer Correct ? | 4 Yes | 4 No |
Post New Answer View All Answers
File not opened because library is *PROD and debug is UPDPROD(*NO). ? what may be the reason? how to solve it..?
What is the use of commit in db2?
What is query_cache_limit?
Where do you specify them?
How do you pull up a query which was previously saved in qmf?
What is role in db2?
What is declare cursor?
What is meant by explain?
Can one database have multiple instances?
What is check constraint. Explain with example.
What are bind parameters in db2?
How do I change the column size in db2?
What is host variable?
What is dclgen (declaration generator)?
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.
