Modify the attributes of an existing sequence with the
ALTER SEQUENCE statement.
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 cycles 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.
Restrictions
The data type of a sequence cannot be changed. Instead, you must
drop the current sequence and then create a sequence specifying the
new data type.
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.
All cached
sequence values not used by the database manager are lost when a sequence
is altered.
DB2 Version 10.1 for Linux, UNIX, and Windows