Storage

-        Hardware upgrades (processor, storage)

-        Operating system or DBMS maintenance

-        Disaster recovery preparation.  

Other events are unplanned (and may happen at inopportune times):

-        Site disasters (floods, power outages, storms, fire, etc.)

-        Hardware failures (disk, CPU, network, etc.)  

-        Operating system failures

-        DBMS failures

-        Operation errors

-        Batch cycle errors

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