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

Howard Chu authored 12 years ago and Quanah Gibson-Mount committed 12 years ago

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 12 years ago and Quanah Gibson-Mount committed 12 years ago

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 12 years ago and Quanah Gibson-Mount committed 12 years ago

Better handling of missing entries

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

Howard Chu authored 12 years ago and Quanah Gibson-Mount committed 12 years ago

Lightning Memory-Mapped Database