Russell Smith 42574d0900 MDL-40584 backup: Query db once per category in precheck
The cache is function local and testing against a large database
indicates 10k questions is a large category.  Restore already
uses MEMORY_EXTRA and that will have enough space for the couple
of megabtyes a local sql hash will introduce.
2013-07-15 16:44:45 +10:00
..
2013-02-12 10:03:29 +01:00