---------- Forwarded message ---------- From: Juerg Bircher <juerg.bircher(a)gmail.com&gt; Date: Sat, May 28, 2016 at 10:30 PM Subject: Re: (ITS#8430) Improved handling for large number of databases To: Hallvard Breien Furuseth <h.b.furuseth(a)usit.uio.no&gt; On Sat, May 28, 2016 at 3:41 AM, Hallvard Breien Furuseth <h.b.furuseth(a)usit.uio.no&gt; wrote: Maybe a good way in between could be to memcpy txn->mt_env->me_dbflags. However md_flags would need to be moved out of the MDB_dbi struct like mt_dbflags or easier just add another array serving as snapshot. This would not break anything with flag initialization as we get a snapshot of them in the mdb_txn_renew0. memcpy uses SSE instructions for x86_64. We should consider to align on 16 byte boundary for best performance. The dbflags could then still be initialized with MDB_UNSUSED as suggested.