2650897e3d
`HA_NO_KEY_READ` marks a key whose blob segment `heap_prepare_hp_create_info()` converted from the VARTEXT2 form, so that `heap_rkey()` refuses an index read on it. It never worked, because the mark was written to the wrong structure member. `heap_rkey()` tests `HP_KEYDEF::flag`, which is where the flag belongs: `HA_NO_KEY_READ` is declared among the key flags, not the key-seg flags. The assignment instead targeted `HA_KEYSEG::flag`, which no reader consults for this flag, so the guard could never fire. That member is also `uint16`, so bit 20 was discarded on assignment as well; `-Wall -Wextra` does not warn, only `-Wconversion` does, and it is not enabled. Write the flag to `keydef[key].flag` instead. `HP_KEYDEF::flag` is `uint` and holds bit 20, and `heap_create()` copies it into the share that `heap_rkey()` reads. `hp_test_key_setup-t` covers the marking, the unmarked case, that `heap_create()` does not lose the flag while folding its own bits into `keydef->flag`, and that `heap_rkey()` refuses a marked key while accepting an unmarked one. The last pair clears `my_assert` so the guard reports instead of aborting, the same way the server's `--debug-assert=0` does, and skips on builds without `DBUG_ASSERT`.
MariaDB Server
MariaDB Server is one of the most widely deployed open source relational databases. It is built by a global community of contributors together with the MariaDB Foundation and MariaDB plc, and it powers workloads from small applications to large-scale production systems.
MariaDB began as a fork of MySQL, led by the original MySQL developers, and it maintains a high degree of MySQL compatibility. It has since grown into a database with its own capabilities, including native vector search, multiple pluggable storage engines, synchronous clustering, and analytical features, while remaining a straightforward migration target for existing MySQL deployments.
Key features
- Native vector search. A built-in VECTOR data type with approximate nearest-neighbour indexing (HNSW), available since MariaDB 11.8 with no extension required.
- Pluggable storage engines. InnoDB (default for transactional workloads), Aria, MyRocks, ColumnStore for analytics, Spider for sharding, and S3 for archival, among others.
- Replication and clustering. Asynchronous, semi-synchronous, and parallel replication with global transaction IDs, plus Galera synchronous multi-primary clustering.
- Advanced SQL. Common table expressions and recursive CTEs, window functions, system-versioned (temporal) tables, sequences, and a broad set of JSON functions.
- MySQL and Oracle compatibility. Wire-protocol and syntax compatibility with MySQL, plus an Oracle SQL mode supporting PL/SQL-style stored routines.
- Spatial and full-text search. GIS data types and functions, and built-in full-text indexing.
- Security. Role-based access control, pluggable authentication (ed25519, PAM, GSSAPI, and more), data-at-rest encryption, and TLS for connections.
Documentation
- Project home, community, and getting involved
- Reference manual and release notes
- MariaDB compared to MySQL
Releases
MariaDB Server follows a yearly long-term support (LTS) model alongside quarterly rolling releases. Binary LTS releases are maintained for three years and are recommended for production; rolling releases deliver new features sooner with a shorter support window.
For the current version and full history, see Releases and the MariaDB release calendar.
Installing
Packages and installation instructions for all supported platforms are available at https://mariadb.org/download/.
Building from source
To build MariaDB from source and run the test suite, follow the developer guide
It covers building the code correctly, running the MariaDB testing framework, and choosing the right branch to target for contributions.
Contributing
Contributions are welcome, from code and documentation to bug reports and reviews. See CONTRIBUTING.md to get started, and CODING_STANDARDS.md for code style. Contributors and community members are recognised in CREDITS.
Getting help
- Zulip chat
- Maria Discuss mailing list
- Bug reports
- Security vulnerabilities: see SECURITY.md
Licensing
MariaDB Server is licensed under version 2 of the GNU General Public License (GPLv2), without the "any later version" clause. This is inherited from MySQL. License information is in the COPYING file, and third-party license information is in the THIRDPARTY file.
About MariaDB Foundation
MariaDB is brought to you by the MariaDB Foundation and MariaDB plc. The MariaDB Foundation is the custodian of the MariaDB Server codebase, ensuring it stays open and that anyone can contribute. See CREDITS for details on the Foundation and the people developing MariaDB.
MySQL, the base of MariaDB, is a product and trademark of Oracle Corporation, Inc.