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add System Update Log in README.md

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Caesar11 2015-09-25 16:13:39 +08:00
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@ -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 modified 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.