Why is my Data.fs so big?

If your Data.fs is still big after packing, here are some tricks you might try to find out why it is big.

1. Write a custom script (example see below) that does a catalog query and returns each brain's getObjSize(). This will only find catalog'ed objects, but these are probably the ones that make your Data.fs big.

2. Check portal_historiesstorage to see how many old versions of objects are stored, and how big these objects are. Maybe there's this one news item with a 4Mb image of which there are 365 versions.

3. Check portal_purgepolicy's setting: by default it will keep an infinite number of versions (-1).

Thanks to Huub for these tips.

# example script to get a list of large content objects
from Products.CMFCore.utils import getToolByName

catalog = getToolByName(context, 'portal_catalog')
total = 0
for r in catalog():
  size_str = r.getObjSize
  (num, pow) = size_str.split(' ')
  num = float(num)
  if pow == 'kB':
    size = num*1
  if pow == 'MB':
    size = num*1000
  size = int(size)
  if size > 100:
    print size, r.getURL()
  total = total + size

print "Total %s kB" % total
return printed