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Question

Restore without Deduplication Database (DDB)?

  • September 23, 2026
  • 2 replies
  • 22 views

DaysAndCycles
Apprentice

My understanding is that the deduplication database is not used in a restore scenario.  Many years ago, I ran a restore without a DDB or IndexCache.  It had to rebuild the IndexCache as it went, and was terribly slow, but it worked.  I found some posts on here saying the same.

Is there any official Commvault documentation that states this explicitly?

Thank you!

2 replies

Hi ​@DaysAndCycles ,

Yes, that’s true, DDB is not required for restores, 

First rule of Commvault to remember is that the DDB is not used at all for restore, only backup
Recovery from cloud Storage, read optimization's | Community

 

It’s not very shiny on Docs, but … 

The DDB is not implemented during the restore process.

Optimize Storage Space Using Deduplication

 

We have internal Lab that simulates this behavior as well,

 

Thanks,

Abdu


DaysAndCycles
Apprentice

Thank you, ​@AbdulRahman AlSindiony !