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hamsterdb Embedded Storage 1.1.10 Sun Jun 19 12:38:45 CEST 2011 (C) Christoph Rupp, firstname.lastname@example.org; http://www.hamsterdb.com This is the README file of hamsterdb Embedded Storage. Contents: 1. About hamsterdb Embedded Storage is a database engine written in ANSI C. It supports a B+Tree index structure, uses memory mapped I/O (if available), supports fast Cursors and variable length keys and can create In-Memory Databases. This release fixes a bug in the cache, which caused the cache to grow and exceed the cache limits. A few other minor bugs were fixed, and the recovery process was improved: changes in the header page (i.e. when adding new Databases or when changing the address of a root page) were not correctly logged. The flag HAM_WRITE_THROUGH has a new meaning: instead of immediately flushing all pages it will now flush all file handles after a Transaction was committed or aborted. This has a performance impact, but improves the Durability of the Transactions. 2. Changes New Features * none Bugfixes * the cache was not purged correctly, thus grew uncontrolled * the hamzilla server always failed to read the configuration file because of a wrong error check * when opening a database, and recovery is enabled, the 'threshold' of the log files (which decides about the log file switching) was not initialized correctly. * header page changes (i.e. when adding databases) were not correctly logged and therefore not recovered after a crash * when ham_open[_ex] or ham_env_open[_ex] return HAM_NEED_RECOVERY these functions deleted the logfiles by mistake. Fixed, and added a unittest to avoid regressions Other Changes * added two new tools - one for dumping the logfile (tools/ham_log) and one for recovering databases (tools/ham_recover) * Environments and Databases are now immediately flushed after being created, otherwise the header page on disk is empty and can not be recovered after a crash * HAM_WRITE_THROUGH now flushes all open file handles after a Transaction was committed or aborted To see a list of all changes, look in the file ChangeLog. 3. Roadmap - improve Transaction handling (see http://crupp.de/2010/10/14/a-new-implementation-for-transactions/) - update .NET wrapper - update Java wrapper - update Python wrapper 4. Features - Very fast sorted B+Tree with variable length keys - Can run as an in-memory database - Supports multiple databases in one file - Supports record number databases ("auto-increment") - Supports duplicate keys (with sorting) - Support for logging and recovery - Support for Transactions (only one Transaction at a time, requires logging) - Support for partial reading/writing of records - Support for network access (remote databases) through http - Very fast database cursors - Configurable page size, cache size and index key size - Portable ANSI-C implementation - Runs on Linux, Unices, Microsoft Windows, Windows CE and on many architectures (also embedded and SPARC) - Endian-independent file format - Uses memory mapped I/O for fast disk access (but falls back to read/write if mmap is not available) - Uses 64bit file pointers and supports huge files (>2 GB) - Easy to use and well-documented - Supports rudimentary live-reorganization by automatically merging freelist entries - Remote access with embeddable server - Open source and released under the GPL 2.0 or later - Supports AES encryption and zlib compression - Wrappers for C++, Python, Java and .NET 5. Known Issues/Bugs None. 6. Compiling 6.1 Linux and Cygwin/Win32 To compile hamsterdb Embedded Storage, run ./configure, make, make install. Run `./configure --help' for more options (i.e. static/dynamic library, build with debugging symbols etc). 6.2 Microsoft Visual Studio 8 A Solution file is provided for Microsoft Visual C++ 2005: 'win32/hamsterdb.sln'. It compiles a static and a dynamic library. Please read the README.TXT file in the win32 directory. All libraries can be downloaded precompiled from the hamsterdb webpage. To download Microsoft Visual C++ 2005 Express Edition for free, go to http://msdn.microsoft.com/vstudio/express/visualc/default.aspx. 6.3 Dependencies hamsterdb will compile out of the box. On Unix, however, remote functionality will be disabled if libcurl and Google protobuf SDKs are not installed. If you want to include remote functionality, then you have to download the dependencies from here: http://code.google.com/p/protobuf/ http://curl.haxx.se/libcurl/ On Ubuntu, you can install the following packages: protobuf-compiler libprotobuf-dev libcurl-dev For Windows, precompiled libcurl/protobuf libraries are available on hamsterdb.com. 7. Testing and Example Code Make automatically compiles several example programs in the directory 'samples'. To see hamsterdb Embedded Storage in action, just run 'samples/db1' or any other sample. (or 'win32/out/samples/db1/db1.exe' on Windows platforms). 8. API Documentation The header files in 'include/ham' have extensive comments. Also, a doxygen script is available; run 'make doc' to start doxygen. The generated documentation is also available on the hamsterdb web page. 9. Other Ways to Compile hamsterdb Embedded Storage If you want to compile hamsterdb without using the provided ./configure environment, you have to set some preprocessor macros: DEBUG enable debugging output and diagnostic checks (slow!) HAM_LITTLE_ENDIAN compile for little endian machines (i.e. x86) HAM_BIG_ENDIAN compile for big endian machines (most other architectures) HAM_32BIT compile for 32bit (alias: WIN32) HAM_64BIT compile for 64bit (alias: WIN64, also needs WIN32) HAM_ENABLE_INTERNAL enable internal functions (declared in include/ham/hamsterdb_int.h) HAM_DISABLE_COMPRESSION build without support for zlib compression HAM_DISABLE_ENCRYPTION build without support for AES encryption HAM_ENABLE_REMOTE build with remote access (needs libcurl/protobuf) Also, if you compile for windows, you have to compile the file 'src/os_win32.c', and ignore the file 'src/os_posix.c'. Vice versa on non-Windows platforms. 10. Porting hamsterdb Embedded Storage Porting hamsterdb Embedded Storage shouldn't be too difficult. All operating system dependend functions are declared in 'src/os.h' and defined in 'src/os_win32.c' or 'src/os_posix.c'. Other compiler- and OS-specific macros are in 'include/ham/types.h'. Most likely, these are the only files which have to be touched. Also see item 9) for important macros. 11. Licensing hamsterdb Embedded Storage can be licensed on a per-developer basis for closed source applications. For more details, see http://hamsterdb.com/licensing and http://hamsterdb.com/store. hamsterdb Embedded Storage is released under GPL2 or later. There are several exceptions for other open source licenses (see http://hamsterdb.com/licensing/exceptions for legal information and a license list). 12. Contact Author of hamsterdb Embedded Storage is Christoph Rupp Paul-Preuss-Str. 63 80995 Muenchen/Germany email: email@example.com web: http://www.hamsterdb.com 13. Other Copyrights The AES library in '3rdparty/aes' is (C) Karl Malbrain, firstname.lastname@example.org (http://www.geocities.com/malbrain). It has the following license: This work, including the source code, documentation and related data, is placed into the public domain. The orginal author is Karl Malbrain. THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND, NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR REDISTRIBUTION OF THIS SOFTWARE. The zlib library in '3rdparty/zlib' is (C) Jean-loup Gailly and Mark Adler. It has the following license: This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution. Jean-loup Gailly Mark Adler email@example.com firstname.lastname@example.org The mongoose http server in '3rdparty/mongoose' is (C) Sergey Lyubka and Gilbert Wellisch. It has the following license: Copyright (c) 2004-2009 Sergey Lyubka Portions Copyright (c) 2009 Gilbert Wellisch Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. The libcurl library is Copyright (c) 1996 - 2010, Daniel Stenberg, <email@example.com>. It has the following license: COPYRIGHT AND PERMISSION NOTICE Copyright (c) 1996 - 2010, Daniel Stenberg, <firstname.lastname@example.org>. All rights reserved. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of a copyright holder shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization of the copyright holder. The Google Protocol Buffers ("protobuf") library is Copyright 2008, Google Inc. It has the following license: Copyright 2008, Google Inc. All rights reserved. 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