RE: questions about LMDB

Several other questions about lmdb 1) does lmdb store one key-value pair in a single page? How lmdb organizes these key-value pairs in a single page 2) if size is larger than single page size , how lmdb process this request? Any help will be appreciated ? thanks Cheers, xinxin -----Original Message----- From: Shu, Xinxin Sent: Thursday, March 19, 2015 3:49 PM To: openldap-devel(a)openldap.org Cc: Shu, Xinxin Subject: questions about LMDB Hi list , Recently I read docs about lmdb , there are two sentences 1) readers do not block writers 2) writers do not block readers I can understand 'readers do not block writers' , but cannot understand the second one , can someone help explain , how lmdb achieve 'writers do not block readers', below is my understandings , please correct me if anything wrong. if the access pattern is write - read, since lmdb only support two version of data , when the write has been started but not committed , the concurrent read may read stale data since write has not been committed. Cheers, xinxin