what does checkpoint do in simple mode?

database is in full mode.
 change it to simple
 run the command 'CHECKPOINT'
 change it back to full.
 
 what has happened in this process?
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25112Asked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Since you just changed the recovery model to simple I would say that you won't loose nothing. But you can check that by the time that it's need to set the recovery model to full again.

And don't forget to make a full backup immediately after went back to full recovery model.
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25112Author Commented:
the above steps was recommended to 'regenerate the log file' which was corrupted.. hence I was trying to understand how checkpoint can do that?

if I just do
---
database is in full mode.
  change it to simple
  change it back to full.
---
it won't regenerate the log file, will it?
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Vitor MontalvãoMSSQL Senior EngineerCommented:
What you mean with "regenerate the log file"?

If means empty the log file, then the answer is yes but be careful because you might loose information and your backup chain will break, that's why you need to run a full backup after set it back to full recovery model so you can start a new backup chain.

But you have a better option that is running transaction log backups. It's the correct and the faster way to do it.

Cheers
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Microsoft SQL Server 2008

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