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mdbx: backport - Update WRITEMAP doc.

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Change-Id: I5c4b72e8c64dfe4ed04ca579f3545191165ef20a
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Howard Chu 2016-01-23 16:51:42 +00:00 committed by Leo Yuriev
parent 9d14f6a2ac
commit 3b7a958fcd
2 changed files with 5 additions and 2 deletions
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@ -10,6 +10,7 @@ LMDB 0.9.18 Release Engineering
already done for mdbx - Additional makefile var tweaks (ITS#8169)
Documentation
Add Getting Started page
Update WRITEMAP description
LMDB 0.9.17 Release (2015/11/30)

6
lmdb.h
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@ -554,9 +554,11 @@ int mdb_env_create(MDB_env **env);
* allowed. LMDB will still modify the lock file - except on read-only
* filesystems, where LMDB does not use locks.
* <li>#MDB_WRITEMAP
* Use a writeable memory map unless MDB_RDONLY is set. This is faster
* and uses fewer mallocs, but loses protection from application bugs
* Use a writeable memory map unless MDB_RDONLY is set. This uses
* fewer mallocs but loses protection from application bugs
* like wild pointer writes and other bad updates into the database.
* This may be slightly faster for DBs that fit entirely in RAM, but
* is slower for DBs larger than RAM.
* Incompatible with nested transactions.
* Do not mix processes with and without MDB_WRITEMAP on the same
* environment. This can defeat durability (#mdb_env_sync etc).