Zero out the complete context buffer
From mhardin@symas.com

Zero out the complete context buffer
From mhardin@symas.com

Howard Chu authored Jan 11, 2013 and Quanah Gibson-Mount committed Jan 26, 2013

This is only a 10% gain, but still worth having for now.

That's all we have space for in a node record.

Also MDB_MAXKEYSIZE is redefinable at compile time.

Forgot this in 98fe3390

Very large single transactions will fail. It's not just a problem when
nested transactions are used. We could make this dynamically sized,
but I'm not sure what the point is.

Howard Chu authored Jan 09, 2013 and Quanah Gibson-Mount committed Jan 09, 2013

No time to find the bug at the moment.
There's no performance benefit anyway.

If we're operating on the freelist, see if our current pghead
can satisfy the request before giving up and using new pages.

Howard Chu authored Dec 28, 2012 and Quanah Gibson-Mount committed Jan 03, 2013

Better handling of missing entries

Treat zero-length entries properly (as missing entries) in entry_next()
and entry_get_int().