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nessDB v1.8 with LSM-Tree && B+Tree
Copyright (C) 2011 BohuTANG________________
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nessDB is a fast Key-Value database, supports Redis-Protocol(PING,SET,MSET,GET,MGET,DEL,EXISTS,INFO).
Which is written in ANSI C with BSD LICENSE and works in most POSIX systems without external dependencies.
The 1.8 version is still under construction.
LAYOUT
======
(1) mtable : which is a sorted 'LSM-Tree' in memory and active for recently ADD/UPDATE/DELETE operations.
(2) log : mtable's snapshot on-disk for data-recover.
(3) on-disk-index : B+Tree structured indices.
V1.8 FEATURES
=============
a. Better performance on Random-Read/Random-Write
b. Log recover
c. Using LSM-Tree && B+Tree
HOW TODO
========
$make db-bench
$db-bench add
BENCHMARK
=========
Keys: 16 bytes each
Values: 80 bytes each
Entries: 5000000
IndexSize: 114.4 MB (estimated)
DataSize: 400.5 MB (estimated)
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nessDB: version 1.8.1(LSM-Tree && B+Tree with Level-LRU,Page-Cache)
Date: Sun Nov 27 18:19:47 2011
CPU: 2 * Intel(R) Pentium(R) Dual CPU T3200 @ 2.00GHz
CPUCache: 1024 KB
+-----------------------+---------------------------+----------------------------------+---------------------+
|Random-Write (done:4999999): 0.000020 sec/op; 50660.5 writes/sec(estimated); 5.2 MB/sec; cost:98.696(sec)
+-----------------------+---------------------------+----------------------------------+---------------------+
|Random-Read (found:0): 0.000119 sec/op; 8382.7 reads /sec(estimated); 0.9 MB/sec; cost:2.386(sec)
+-----------------------+---------------------------+----------------------------------+---------------------+
|Seq-Read (found:0): 0.000119 sec/op; 8417.3 reads /sec(estimated); 0.9 MB/sec; cost:2.376(sec)
+-----------------------+---------------------------+----------------------------------+---------------------+
Thanks for your attention!