[Date Prev][Date Next]
Re: (LMDB) Correct use of mdb_env_sync
Pierre Chapuis wrote:
I am having a hard time understanding how exactly mdb_env_sync should
be used. Suppose I have an environment with MDB_NOSYNC and I do not use
MDB_WRITEMAP. I still want to sync at some points, which is why
mdb_env_sync exists. But I wonder:
- How does it interact with transactions? Is it safe (or necessary) to
call it outside of a transaction? During a read-only transaction?
During a write transaction?
Since mdb_env_sync() doesn't take a txn as a parameter, it is impossible to
call it inside of a transaction.
- What about thread safety? Can it be called concurrently with writes?
Can it be called concurrently with another mdb_env_sync in another
Try it and see.
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/