upscaledb 2.1.13 Fr 5. Feb 13:22:01 CET 2016 (C) Christoph Rupp, chris@crupp.de; http://www.upscaledb.com This is the README file of upscaledb. Contents: 1. About upscaledb is a database engine written in C/C++. It is fast, production-proven and easy to use. This release fixes a few bugs. This is the last stable release before 2.2.0. The most significant fixes are: - #47: fixed bad assert in ups_cursor_move; this caused crashes in debug mode - #66: return with error if a database is modified by a committed transaction which was not yet flushed to disk; this caused crashes when closing an Environment (ups_env_close) - #64: fixed segfault when recovering a database with a custom compare function; deprecated ups_db_set_compare_func, use ups_register_compare/UPS_PARAM_CUSTOM_COMPARE_NAME instead. Also, the .NET/C# delegate for custom compare functions has been changed, the delegate has to perform the marshalling now (see unittests for a sample) - issue #60: files are now truncated after a database was deleted with ups_env_erase_db The file format is not compatible to 2.1.12. CALL FOR ACTION: Are you using the "partial reads/writes"? i.e. searching or inserting partial records with UPS_PARTIAL? If yes then please tell me - I still remove functionality that is not used or rarely used. 2. Changes New Features * none Bugfixes * issue #47: fixed bad assert in ups_cursor_move * issue #55: correctly handling error condition if mmap fails * issue #60: files are now truncated after a database was deleted with ups_env_erase_db (thanks, vevova) * issue #62: ups_info prints wrong value for "max record size" * issue #64: fixed segfault when recovering a database with a custom compare function; deprecated ups_db_set_compare_func, use ups_register_compare/UPS_PARAM_CUSTOM_COMPARE_NAME instead * issue #66: return with error if a database is modified by a committed transaction which was not yet flushed to disk (thanks, Balazs Bamer) * issue #67: fixed broken installation path and other "ham"/"hamsterdb" references (thanks, Wouter Hager) Other Changes * Changed the .NET/C# delegate interface for custom compare functions; the delegate has to perform the marshalling now (see unittests for a sample) * Now restoring the "active blob page" after recovery to reduce the file size. * UPS_ENABLE_RECOVERY is now an alias for UPS_ENABLE_TRANSACTIONS To see a list of all changes, look in the file ChangeLog. 3. Features - 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 - Transparent AES encryption - Transparent CRC32 verification - Various compression codecs for journal, keys and records using zlib, snappy, lzf - Compression for uint32 keys - 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 4. Known Issues/Bugs See https://github.com/cruppstahl/upscaledb/issues. 5. Compiling 5.1 Linux, MacOS and other Unix systems To compile upscaledb, run ./configure, make, make install. Run `./configure --help' for more options (i.e. static/dynamic library, build with debugging symbols etc). 5.2 Microsoft Visual Studio A Solution file is provided for Microsoft Visual C++ in the "win32" folder for MSVC 2013. All libraries can be downloaded precompiled from the upscaledb webpage. To download Microsoft Visual Studio Express Edition for free, go to http://msdn.microsoft.com/vstudio/express/visualc/default.aspx. 5.3 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/upscaledb-alien 6. Testing and Example Code Make automatically compiles several example programs in the directory 'samples'. To see upscaledb in action, just run 'samples/db1' or any other sample. (or 'win32/out/samples/db1/db1.exe' on Windows platforms). 7. API Documentation The header files in 'include/ups' have extensive comments. Also, a doxygen script is available; run 'make doc' to start doxygen. The generated documentation is also available on the upscaledb web page. 8. Porting upscaledb Porting upscaledb shouldn't be too difficult. All operating system dependend functions are declared in '1os/*.h' and defined in '1os/os_win32.cc' or '1os/os_posix.cc'. Other compiler- and OS-specific macros are in 'include/ups/types.h'. Most likely, these are the only files which have to be touched. Also see item 9) for important macros. 9. Migrating files from older versions Usually, upscaledb 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 ups_export linked against the old version. (ups_export links statically and will NOT be confused if your system has a newer version of upscaledb installed). Then use the newest version of ups_import to import the data into a new database. You can find ups_export and ups_import in the "tools" subdirectory. Example (ups_export of 2.1.2 was renamed to ups_export-2.1.2 for clarity): ups_export-2.1.2 input.db | ups_import --stdin output.db 10. Licensing upscaledb is released under the GNU Public License (GPL) 3.0. See the file COPYING for more information. For commercial use licenses are available. Visit http://upscaledb.com for more information. 11. Contact Author of upscaledb is Christoph Rupp Paul-Preuss-Str. 63 80995 Muenchen/Germany email: chris@crupp.de web: http://www.upscaledb.com 12. 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. 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