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  3. June 2006

Re: Journal records written to disk

Database records can (and usualy are) cached in volatile memmory, the journal must be written when the transactions is commited. The OS (or datbamase manager) must hold the procces in the commit until the jorunal write is complete. 
_______________________________________________________________________________
msmith6@xxxxxxxxxxxx wrote:


has a disk controller cache ever been documented to fail - causing a
corrupted database?  Will the controller battery hold on for a Katrina
power out length of time?

-Steve
This is getting lower level that I was getting at. Essentially, the question is if the database will wait for say, three records to get updated before it will acutally write the data to disk. Is it at that point the OS writes the journal entries and then writes the database entries or are the journal entries always written directly to disk and the database records are written when the threshold is reached. Whether the cache in the controller get corrupted ro any other hardware function is interrupted is not what I'm getting at. 

Mike.

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