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** '''Written in:''' C++ | ** '''Written in:''' C++ | ||
** '''Wrappers for:''' Java (In development) | ** '''Wrappers for:''' Java (In development) | ||
** '''Packages available for:''' Not available in Fedora | ** '''Packages available for:''' Not yet available in Fedora | ||
** '''Latest release:''' 4.9.0 / 2016-06-09 | ** '''Latest release:''' 4.9.0 / 2016-06-09 | ||
** '''License:''' [https://opensource.org/licenses/BSD-3-Clause 3-Clause BSD] | ** '''License:''' [https://opensource.org/licenses/BSD-3-Clause 3-Clause BSD] | ||
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** '''Latest release:''' 1.1.6 / 2015-08-26 | ** '''Latest release:''' 1.1.6 / 2015-08-26 | ||
** '''License:''' [https://opensource.org/licenses/BSD-2-Clause 2-Clause BSD] | ** '''License:''' [https://opensource.org/licenses/BSD-2-Clause 2-Clause BSD] | ||
** '''Search key length:''' | ** '''Search key length:''' No limit apart from the data type used for holding the key length (int). Data length limited by the data type unqlite_int64 (64b int). | ||
** '''Read-only access to DB:''' | ** '''Read-only access to DB:''' Supports concurrent readers. In order to be thread-safe, UnQLite must be compiled with the UNQLITE_ENABLE_THREADS directive defined. | ||
** '''Supported architectures:''' | ** '''Supported architectures:''' | ||
** '''Query keys larger than X:''' | ** '''Query keys larger than X:''' UNQLITE_CURSOR_MATCH_LE and UNQLITE_CURSOR_MATCH_GE when using [https://unqlite.org/c_api/unqlite_kv_cursor.html cursors]. This options have sense only if the underlying key/value storage subsystem support range search (i.e: B+Tree, R+Tree, etc.). | ||
== Older (probably unmantained) projects == | == Older (probably unmantained) projects == | ||
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** '''Query keys larger than X:''' | ** '''Query keys larger than X:''' | ||
* ''' | * '''GDBM''' | ||
** '''Written in:''' | ** '''Written in:''' | ||
** '''Wrappers for:''' | ** '''Wrappers for:''' | ||
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** '''Query keys larger than X:''' | ** '''Query keys larger than X:''' | ||
* ''' | * '''NDBM''' | ||
** '''Written in:''' | ** '''Written in:''' | ||
** '''Wrappers for:''' | ** '''Wrappers for:''' | ||
Revision as of 05:53, 28 July 2016
- LMDB
- Written in: C
- Wrappers for: C++, Java, Python, Perl, Ruby, Go, Erlang, PHP, Lua
- Packages available for: Fedora 23+, EPEL6+
- Latest release: 0.9.18 / 2016-02-05
- License: OpenLDAP Public License
- Search key length: Maximum length of 1/3 of a page (~1365B)
- Read-only access to DB: The library is fully thread-aware and supports concurrent read/write access from multiple processes and threads. (docs)
- Supported architectures: i386/x86-64/PowerPC/ARM
- Query keys larger than X: Using cursors: MDB_SET_RANGE - Position at first key greater than or equal to specified key.
- Kyoto Cabinet (replacing Tokyo Cabinet)
- Written in: C++
- Wrappers for: C, Java, Python, Ruby, Perl, and Lua
- Packages available for: Fedora 23+, EPEL5+
- Latest release: 1.2.76 / 2012-05-24
- License: GNU GPL
- Search key length: No limit from database itself (uses c++ std::string or combination of c-style string and its length).
- Read-only access to DB: See http://fallabs.com/kyotocabinet/spex.html, part Sharing One database by Multiple Processes. TL;DR: One DB cannot be accessed by multiple processes, DB file is protected by reader-writer lock (which means it will probably require write access even for read-only operation).
- Supported architectures: Linux 2.6 and later (i386/x86-64/PowerPC/Alpha/SPARC)
- Query keys larger than X: DB supports matching by regex, which should be possible to use for this kind of query. Other possibilities are match by prefix and match by similarity.
- LevelDB
- Written in: C++
- Wrappers for: Java, Go, Erlang, node.js
- Packages available for: Fedora 23+, EPEL6+
- Latest release: 1.18 / 2014-09-16
- License: 3-Clause BSD
- Search key length: No limit apart from the data type used for holding the key length (size_t)
- Read-only access to DB: A database may only be opened by one process at a time. The leveldb implementation acquires a lock from the operating system to prevent misuse. Within a single process, the same leveldb::DB object may be safely shared by multiple concurrent threads. (docs)
- Supported architectures: i386/x86-64/PowerPC/ARM
- Query keys larger than X: Native library's Iterator can Seek (Position at the first key in the source that at or past target) + reverse, node.js wrapper is able to use basic filters (greater than, lower than)
- RocksDB (Built on LevelDB)
- Written in: C++
- Wrappers for: Java (In development)
- Packages available for: Not yet available in Fedora
- Latest release: 4.9.0 / 2016-06-09
- License: 3-Clause BSD
- Search key length: No limit apart from the data type used for holding the key length (size_t)
- Read-only access to DB: A database may only be opened by one process at a time. The rocksdb implementation acquires a lock from the operating system to prevent misuse. Within a single process, the same rocksdb::DB object may be safely shared by multiple concurrent threads. (docs)
- Supported architectures: x86-64/PowerPC/ARM
- Query keys larger than X: Iterator can Seek (Position at the first key in the source that at or past target) + reverse
- UnQlite
- Written in: C
- Wrappers for:
- Packages available for: Not yet available in Fedora
- Latest release: 1.1.6 / 2015-08-26
- License: 2-Clause BSD
- Search key length: No limit apart from the data type used for holding the key length (int). Data length limited by the data type unqlite_int64 (64b int).
- Read-only access to DB: Supports concurrent readers. In order to be thread-safe, UnQLite must be compiled with the UNQLITE_ENABLE_THREADS directive defined.
- Supported architectures:
- Query keys larger than X: UNQLITE_CURSOR_MATCH_LE and UNQLITE_CURSOR_MATCH_GE when using cursors. This options have sense only if the underlying key/value storage subsystem support range search (i.e: B+Tree, R+Tree, etc.).
Older (probably unmantained) projects
- TokyoCabinet (replacing QDBM)
- Written in: C
- Wrappers for: Perl, Ruby, Java, and Lua
- Packages available for: Fedora 23+, EPEL5+, RHEL6+
- Latest release: 1.4.48 / 2012-08-18
- License: GNU LGPL
- Search key length:
- Read-only access to DB:
- Supported architectures: Linux 2.4 and later (x86-32/x86-64/PowerPC/Alpha/SPARC)
- Query keys larger than X:
- QDBM
- Written in: C
- Wrappers for: C++, Java, Perl, and Ruby
- Packages available for: Fedora 23+
- Latest release: 1.8.78 / 2007-03-07
- License: GNU LGPL
- Search key length:
- Read-only access to DB:
- Supported architectures: Linux (2.2, 2.4, 2.6) (IA32, IA64, AMD64, PA-RISC, Alpha, PowerPC, M68000, ARM)
- Query keys larger than X:
- GDBM
- Written in:
- Wrappers for:
- Packages available for:
- Latest release:
- License:
- Search key length:
- Read-only access to DB:
- Supported architectures:
- Query keys larger than X:
- NDBM
- Written in:
- Wrappers for:
- Packages available for:
- Latest release:
- License:
- Search key length:
- Read-only access to DB:
- Supported architectures:
- Query keys larger than X: