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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 Tue, 02 Aug 2005 09:50:22 GMT
>>>>> "ØG" == Øystein Grøvlen <Oystein.Grovlen@Sun.COM> writes:

>>>>> "ST" == Suresh Thalamati <suresh.thalamati@gmail.com> writes:
    ST> My  initial thought  is to  simply disable  garbage-collection  of log
    ST> files for the  duration of the backup. unless  there are some specific
    ST> advantages in writing backup-start log record.

    ØG> Disabling garabage-collection directly is probably the cleanest way to
    ØG> do this.

On second thoughts, for large databases, the time to copy the data
files may be so long that the log volume becomes prohibitively large
if garbage collection is turned off for the entire backup.  In that
case, it would be better to copy finished log files in parallel with
the data files and let them be garbage collected at any time after it
has been copied.  This probably does not need to be part of a first
implementation, but something one should consider for the future.


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