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From Oystein.Grov...@Sun.COM (Øystein Grøvlen)
Subject Re: [jira] Commented: (DERBY-239) Need a online backup feature that does not block update operations when online backup is in progress.
Date Mon, 31 Oct 2005 21:58:43 GMT
>>>>> "MM" == Mike Matrigali <mikem_app@sbcglobal.net> writes:

    MM> I believe Derby gives the OS plenty of opportunity to do parallel I/O
    MM> if there are multiple users in the database.  Every thread can possibly
    MM> be doing I/O at a single time.  There may be room to improve in the case
    MM> of checkpoint, but not sure how important that is.

See my recent email on Derby I/O issues.  Only one thread may
read/write a page from/to a file (table) at a time since readPage and
writePage synchronize their accesses on the RAFContainer object.

-- 
Øystein


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