To backup DB2 database (maintenance purpose), use the following:

1. Ensure you have enough disk space to store the image.
2. Execute:

   db2 BACKUP DATABASE TCGA TO '/data/backup' 

3. Check db2dump logs for any potential error.

To rebuild the database from a backup image or to restore DB2 database (to an existing or new node), use the following:

1. Assume the TCGA or PAIS database image is stored at /data/backup and the new location for the database is at /data/database/tcga.
2. Ensure DB2 version is the same or later than the database version used in the image (including the fix pack).
3. Ensure there is enough temporary space in the member directory space. The original data path of the database was at /opt2/databases. Create symbolic links to larger space if necessary.
4. Ensure you have all users created as described in Create DB2 groups and users guide. In our case, you need db2inst1, db2inst2, db2fenc1 and dasusr1 for the image of TCGA; only user db2inst2 has the permission to access of table space.
5. Execute the following command to restore the database (this process will take a significant amount of time) using user db2inst1:

   db2 RESTORE DATABASE TCGA FROM '/data/backup' TAKEN AT 20140930101430 TO '/data/database/tcga'  INTO TCGA  NEWLOGPATH '/data/database/log/tcga'

6. Check db2dump logs for any potential error.
7. Note:
   • For TCGA database image built from Emory, user db2inst1 is the owner of the db2 instance that runs db2start and db2stop as well as other configuration. User db2inst2 login information is used to access database contents (for portal and WEB API).