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Status Submitted
Workspace Replication: Q-Replication & Availability
Components Replication for Availability (LUW, Db2 Warehouse)
Created by Guest
Created on Nov 13, 2024

RELATED IDEAS

For tables w/ columns that are generated by default, update the internal sequence with the next value for the column

When using Qrep for DR , we have to make the target table which has generated numeric values to be generated by default.  That is understood. 
In a DR scenario, when we fail over from the A to the B side, we have to run a script that gets the max value for the column and issue an "alter table <tabname> alter column <colname> restart with <max value +1>".  If not the following happens:
1) Table get created on both the A side and B side and replication is set up with numeric generated column COL1
2) Table A gets 100 rows loaded so COL1 next value is 101.  Data is replicated to B side
3) We have a DR event and apps that write are pointed to the B side
4) If an app writes to the table on the B side, the next generated column value for COL1 is 1 , not 101.  The data insert would fail if COL1 is the primary key.

Why is this needed ?  When using Qrep for DR where HADR is not an option (ex. DPF systems) , we can automate the failover of apps that write to the database instead of having to write a script that update the generated columns.   In some cases where ETL apps try to write to the B side after a failover, we can prevent data corruption. 

Needed By Yesterday (Let's go already!)

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