Subject Re: [firebird-support] Re: sweep taking a long time
Author Ann W. Harrison
Adam wrote:
> Also, the purpose of garbage collection during backup is not to
> benefit the backup file. Firebird Classic has no dedicated garbage
> collection thread, which means that in an archival type system,
> garbage may never be cleaned out.

As it happens, the garbage collect thread in SuperServer removes
only obsolete rows that are on pages where a transaction has found
a record that needs garbage collection so both system tend to keep
old versions if the record are not revisited.