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hamsterdb 2.1.11 Mi 6. Mai 09:40:22 CEST 2015 (C) Christoph Rupp, chris@crupp.de; http://www.hamsterdb.com This is the README file of hamsterdb. Contents: 1. About hamsterdb is a database engine written in C/C++. It is fast, production-proven and easy to use. This release has several bug fixes (see below for a list). One bug is a race condition on Win32 which can lead to application crashes. The other bugs can lead to wrong query results if Transactions are enabled and approximate matching is used. In addition, there were minor performance improvements. The file format is compatible to 2.1.10. 2. Changes New Features * none Bugfixes * C++ API no longer throws exceptions in destructors (thanks, Michael Möllney) * issue #49: fixed approx. matching issue with remote server * issue #53: fixed race condition on Win32 * issue #52: fixed cursor iteration w/ txns and approx matching * issue #50: removing problematic debug checks Other Changes * Reducing I/O operations by allocating large buffers if file grows fast * Add InsertRecNo method to hamsterdb-dotnet (thanks, mjmckp) To see a list of all changes, look in the file ChangeLog. 3. Roadmap - See https://github.com/cruppstahl/hamsterdb/wiki/Roadmap 4. Features - PRO: SIMD instructions for lookups - PRO: transparent AES encryption - PRO: transparent CRC32 verification - PRO: transparent compression for journal, keys and records using zlib, snappy, lzf or lzo - PRO: compression for uint32 keys - Very fast sorted B+Tree with variable length keys - Basic schema support for POD types (i.e. uint32, uint64, real32 etc) - Very fast analytical functions - Can run as an in-memory database - Multiple databases in one file - Record number databases ("auto-increment") - Duplicate keys - Logging and recovery - Unlimited number of parallel Transactions - Partial reading/writing of records - Network access (remote databases) via TCP/Protocol Buffers - Very fast bi-directional database cursors - Configurable page size, cache size, key sizes etc - Runs on Linux, Unices, Microsoft Windows and other architectures - 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 - Open source and released under APL 2.0 license - Wrappers for C++, Java, .NET, Erlang, Python, Ada and others 5. Known Issues/Bugs See https://github.com/cruppstahl/hamsterdb/issues. 6. Compiling 6.1 Linux, MacOS and other Unix systems To compile hamsterdb, 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 A Solution file is provided for Microsoft Visual C++ in the "win32" folder for MSVC 2010 and MSVC 2013. All libraries can be downloaded precompiled from the hamsterdb webpage. To download Microsoft Visual Studio Express Edition for free, go to http://msdn.microsoft.com/vstudio/express/visualc/default.aspx. 6.3 Dependencies On Ubuntu, the following packages are required: - libdb-dev (optional) - protobuf-compiler - libprotobuf-dev - libgoogle-perftools-dev - libboost-system-dev - libboost-thread-dev - libboost-dev - (libuv needs to be installed from sources - see https://github.com/joyent/libuv) For Windows, precompiled dependencies are available here: https://github.com/cruppstahl/hamsterdb-alien 7. Testing and Example Code Make automatically compiles several example programs in the directory 'samples'. To see hamsterdb 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 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_32BIT compile for 32bit (alias: WIN32) HAM_64BIT compile for 64bit (alias: WIN64, also needs WIN32) Also, if you compile for windows, you have to compile the file 'src/os_win32.cc' and ignore the file 'src/os_posix.cc'. Vice versa on non-Windows platforms. 10. Porting hamsterdb Porting hamsterdb shouldn't be too difficult. All operating system dependend functions are declared in 'src/os.h' and defined in 'src/os_win32.cc' or 'src/os_posix.cc'. 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. Migrating files from older versions Usually, hamsterdb releases are backwards compatible. There are some exceptions, though. In this case tools are provided to migrate the database. First, export your existing database with ham_export linked against the old version. (ham_export links statically and will NOT be confused if your system has a newer version of hamsterdb installed). Then use the newest version of ham_import to import the data into a new database. You can find ham_export and ham_import in the "tools" subdirectory. Example (ham_export of 2.1.2 was renamed to ham_export-2.1.2 for clarity): ham_export-2.1.2 input.db | ham_import --stdin output.db 12. Licensing hamsterdb is released under the APL 2.0 license, which allows unrestricted use for commercial and non-commercial applications. See the file COPYING for more information. A commercial, closed source version hamsterdb pro with additional functionality is available on request. See http://hamsterdb.com for more information. 13. Contact Author of hamsterdb is Christoph Rupp Paul-Preuss-Str. 63 80995 Muenchen/Germany email: chris@crupp.de web: http://www.hamsterdb.com 14. Other Copyrights The Google Protocol Buffers ("protobuf") library is Copyright 2008, Google Inc. It has the following license: Copyright 2008, Google Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of Google Inc. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Code generated by the Protocol Buffer compiler is owned by the owner of the input file used when generating it. This code is not standalone and requires a support library to be linked with it. This support library is itself covered by the above license. The libuv library is part of the Node project: http://nodejs.org/ libuv may be distributed alone under Node's license: Copyright Joyent, Inc. and other Node contributors. All rights reserved. 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.
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