In BIND, isolation level parameter specifies the duration
of page lock and ACQUIRE, RELEASE also do almost the same
thing. What is the exact difference between the two? Do
they work in conjunction while executing SQL queries and
obtaining locks?
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Answer Posted / priya
When a tablespace is locked, another task cannot have
access to the entire table itself. So here, does page level
locking matter and what difference remains between
ISOLATION and ACQUIRE/RELEASE?
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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.
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