Modify the attributes of an existing sequence with the ALTER SEQUENCE
statement.
About this task
The attributes of the sequence that can be modified include:
- Changing the increment between future values
- Establishing new minimum or maximum values
- Changing the number of cached sequence numbers
- Changing whether the sequence will cycle or not
- Changing whether sequence numbers must be generated in order of request
- Restarting the sequence
There are two tasks that are not found as part of the creation of
the sequence. They are:
- RESTART: Resets the sequence to the value specified implicitly
or explicitly as the starting value when the sequence was created.
- RESTART WITH <numeric-constant>: Resets the sequence to the
exact numeric constant value. The numeric constant can be any positive or
negative value with no non-zero digits to the right of any decimal point.
What to do next
After restarting a sequence or changing to CYCLE, it is possible
to generate duplicate sequence numbers. Only future sequence numbers are affected
by the ALTER SEQUENCE statement.
The data type of a sequence cannot be changed.
Instead, you must drop the current sequence and then create a new sequence
specifying the new data type.
All cached sequence values not used by
the database manager are lost when a sequence is altered.
DB2 Version 9.7 for Linux, UNIX, and Windows