Preserve DB flags (use metapage#1) when main DB is empty.
Fail if metapage root != actual root in output file.

Howard Chu authored Jan 07, 2016 and Hallvard Furuseth committed Dec 15, 2016

Logical counterpart to GET_MULTIPLE, NEXT_MULTIPLE

Add mdb_put text to mdb_cursor_put description for people who
fail to draw logical conclusions.

* Add MDB_TXN_FINISHED, MDB_TXN_HAS_CHILD, MDB_TXN_BLOCKED.
* Clear mt_numdbs in writers, for TXN_DBI_EXIST() to catch.
  We already do in readers.

David Barbour authored Jan 12, 2015 and Hallvard Furuseth committed Oct 25, 2015

commit b660491d (mdb_txn_id())
plus c36c167c (fix prev commit)
from mdb.master.

For those people who insist on ignoring the obvious.

Missed this in 7ce29b9e

Hallvard Furuseth authored Jul 11, 2015 and Howard Chu committed Jul 28, 2015

Except we don't catch the user passing F_SUBDATA to
mdb_cursor_<put/del>, like an internal LMDB call.

We actually compare the new key against the last key, to prevent
corruption.

The concurrency restriction is on threads within a single process.
Multiple processes can use mdb_dbi_open without affecting each other.

Revert "ITS#7789 Fix resize vs MDB_NOMETASYNC, and a comment."
Revert "ITS#7789 more"
Revert "Revert "ITS#7789 update RESIZED errmsg text""
Revert "ITS#7789 update RESIZED errmsg text"
Revert "ITS#7789 persist mapsize changes"

This reverts commit 02285aca.
This reverts commit 38e71c68.
This reverts commit a5e4eecb.
This reverts commit d8e18551.
This reverts commit 5926e54b.