From 125b088bb3f9184d062cabca4f7b1e710b302fec Mon Sep 17 00:00:00 2001 From: Caesar11 Date: Mon, 19 Oct 2015 17:08:14 +0800 Subject: [PATCH] Update README.md recover README.md --- README.md | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/README.md b/README.md index 1bec306..ee93466 100644 --- a/README.md +++ b/README.md @@ -135,4 +135,29 @@ Note that each command ends with ";". ####5. API We provide JAVA and C++ API for accessing gStore now. Please refer to example codes in `api/cpp/example` and `api/java/example`. +### System Update Log +####Sep 25, 2015. + +We implement the version of BTree, and replace the old one. + +After testing on DBpedia, LUBM, and WatDiv benchmark, we conclude that the new BTree performs more efficient than +the old version. For the same triple file, the new version spends shorter time on executing gload command. + +Besides, the new version can handle the long literal objects ocasion efficiently, while triples whose object's length exceeds 4096 bytes result in frequent inefficent split operations on the old version BTree. + +####Feb 2, 2015 + +We modify the RDF parser and SPARQL parser. + +Under the new RDF parser, we also redesign the encode strategy, which reduces RDF file scanning times. + +Now we can parse the standard SPARQL v1.1 grammar correctly, and can support basic graph pattern(BGP) SPARQL queries written by this standard grammar. + +####Dec 11, 2014. + +We add API for C/CPP and JAVA. + +####Nov 20, 2014. + +We share our gStore2.0 code as an open-source project under BSD license on github.