A library that provides an embeddable, persistent key-value store for fast storage.
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- Based on suggestions on the sqlite-users mailing list, we removed the superfluous index on the primary key for SQLite's benchmarks, and turned write-ahead logging ("WAL") on. This led to performance improvements for SQLite. - Based on a suggestion by Florian Weimer on the leveldb mailing list, we disabled hard drive write-caching via hdparm when testing synchronous writes. This led to performance losses for LevelDB and Kyoto TreeDB. - Fixed a mistake in 2.A.->Random where the bar sizes were switched for Kyoto TreeDB and SQLite. git-svn-id: https://leveldb.googlecode.com/svn/trunk@45 62dab493-f737-651d-591e-8d6aee1b9529 |
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leveldb: A key-value store Authors: Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com) The code under this directory implements a system for maintaining a persistent key/value store. See doc/index.html for more explanation. See doc/impl.html for a brief overview of the implementation. The public interface is in include/*.h. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning. Guide to header files: include/db.h Main interface to the DB: Start here include/options.h Control over the behavior of an entire database, and also control over the behavior of individual reads and writes. include/comparator.h Abstraction for user-specified comparison function. If you want just bytewise comparison of keys, you can use the default comparator, but clients can write their own comparator implementations if they want custom ordering (e.g. to handle different character encodings, etc.) include/iterator.h Interface for iterating over data. You can get an iterator from a DB object. include/write_batch.h Interface for atomically applying multiple updates to a database. include/slice.h A simple module for maintaining a pointer and a length into some other byte array. include/status.h Status is returned from many of the public interfaces and is used to report success and various kinds of errors. include/env.h Abstraction of the OS environment. A posix implementation of this interface is in util/env_posix.cc include/table.h include/table_builder.h Lower-level modules that most clients probably won't use directly