sqldb2sequencesdatabase-sequence

Db2: How to update the current value of a sequence

We use a sequence in a Db2 database. Recently, we have migrated the data from an AIX server to a Linux server. During that the latest number of that sequence was not moved to the Linux system. As a consequence, we are seeing duplicates values now.

Here is how we use the sequence:

SELECT NEXTVAL FOR SEQ_YFS_ORDER_NO FROM SYSIBM.SYSDUMMY1

The current value of the sequence on Linux is 100092142. How can I update it to the current value that we have on the AIX system, i.e to (100110960)?

Solution

  • You can modify the sequence using ALTER SEQUENCE. An option offered by ALTER SEQUENCE is to RESTART it with a specific value. Try something like this:

    ALTER SEQUENCE SEQ_YFS_ORDER_NO RESTART WITH 100110960

    Also note that sequence numbers typically are cached. This may lead to a gap and could have caused the issue during the migration.