Thank you! I will check that. On Thu, Nov 19, 2015 at 5:37 PM, Howard Chu <h...@symas.com> wrote:
> Xinhai Kang wrote: > >> Hi, >> >> I am new to LMDB and I am checking the possibility of having persistent >> snapshot support in LMDB. >> In the current code, LMDB creates a transient snapshot when a transaction >> is >> started. And also, LMDA supports multiple multiple databases in an >> environment. I am wondering if it is possible to make the snapshot >> persistent >> by storing the snapshot as a separate database (can different database >> share >> pages? Or can multiple trees in the same database?). >> >> I look forward to hearing from you! Or please kindly let me know if >> similar >> feature has already been implemented somewhere. >> > > That is not a feature that we need/want in LMDB. If you want persistent > access to historical versions of a DB, use an append-only database. The > btree.c written by Martin Hedenfalk would be one example. > > -- > -- Howard Chu > CTO, Symas Corp. http://www.symas.com > Director, Highland Sun http://highlandsun.com/hyc/ > Chief Architect, OpenLDAP http://www.openldap.org/project/ >
