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Tie data hash to DBM file leaving massive cruft?by punch_card_don (Curate) |
on Mar 05, 2013 at 20:26 UTC ( [id://1021900]=perlquestion: print w/replies, xml ) | Need Help?? |
punch_card_don has asked for the wisdom of the Perl Monks concerning the following question:
Motional Monks,
For depressing-to-explain reasons, we're using an old DBM file (data_dbm_file) as a backup to a small sql database (data_db) of name/value pairs. Each time data_db is updated, the following sub routine is run: And this is re-run every time there's a change to the data_db database. So, essentially, the DBM file gets completely re-written every time there's any change to the data_db database. It seems to work just fine - the DBM file is checked on occasion and always mirrors the sql database. BUT - there's always a but - if I ftp a copy of the data_dbm_file from the server onto my (Windows) PC, and open it in Notepad, among the long list of data I find this sort of thing: Multiple entires with slight variations of old name/value pairs that were thought to be deleted long ago. There can be dozens of them for a single name. But they don't appear in a listing of the contents of the DBM file if we do: This outputs just the expected name/value pairs. What is all this extra cruft? Is this due to something about our re-writing sub-routine? Or a typical result in a DBM file? Or something else? Thanks. Time flies like an arrow. Fruit flies like a banana.
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