bigkun / nessDB

A very fast key-value, embedded Database Storage Engine. Using SST(Small-Splittable Tree, one of Bε-tree) as storage engine from version 2.0.

Home Page:https://groups.google.com/group/nessdb

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nessDB v2.0 with Small-Splittable Tree (one of Bε-tree)
Copyright (C) 2012-2013 BohuTANG________________ 
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  nessDB is a fast Key-Value database(embedded), which is written in ANSI C with GPL LICENSE and works in most POSIX systems without external dependencies.

  From Version 2.0, nessDB uses Small-Splittable Tree (SST), it's one of Bε-tree and Cache-oblivious write-optimized structure, for more details, please refer to documentations which in 'spec' folder.
  
  V2.0 FEATURES
  =============
  a. Better performances on Random-Read/Write
  b. Using Small-Splittable Tree as storage engine
  c. Using fractional cascading to speed up search
  d. Cache-oblivious write-optimized structure

  HOW TODO BENCHMARK
  ==================
  $make db-bench
  $./db-bench <write | read > <count> 
	or 
  $./db-bench readone <key>

  If you want delete all indexes/db/logs, you should do:
  $make cleandb

  HOW TO USE AS DB ENGINE
  =======================
  a. OPEN
		struct nessdb *db = db_open(db-path); 

  b. ADD
  		struct slice sk, sv;
		sk.len = 3;
		sk.data = "key";
		sv.len = 5;
		sv.data = "value";
		db_add(db, &sk, &sv);

  c. DELETE
  		struct slice sk;
		sk.len = 3;
		sk.data = "key";
		db_remove(db, &sk);

  d. READ
  		struct slice sk, sv;
		sk.len = 3;
		sk.data = "key";
		int ret = db_get(db, &sk, &sv);
		if (ret == 1) {
			printf("data is %s", sv.data);
			db_free_data(sv.data);
		} else
			print("Not found");

  e. EXISTS 
		struct slice sk;
		sk.len = 3;
		sk.data = "key";
		int ret = db_exists(db, &sk);
		if (ret == 1)
			print("yes, exists");
		else
			print("oops");

  f. SHRINK 
  		db_shrink(db);

  g. CLOSE
  		db_close(db);

  Thanks for your attention!

  				--BohuTANG--
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A very fast key-value, embedded Database Storage Engine. Using SST(Small-Splittable Tree, one of Bε-tree) as storage engine from version 2.0.

https://groups.google.com/group/nessdb

License:GNU General Public License v2.0