SQLite
SQL database connection development library.
Overview
SQLite is an in-process library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine.
The code for SQLite is in the public domain and is thus free for use for any purpose, commercial or private. SQLite is currently found in more applications than we can count, including several high-profile projects. SQLite is an embedded SQL database engine. Unlike most other SQL databases, SQLite does not have a separate server process. SQLite reads and writes directly to ordinary disk files. A complete SQL database with multiple tables, indices, triggers, and views, is contained in a single disk file.
The database file format is cross-platform - you can freely copy a database between 32-bit and 64-bit systems or between big-endian and little-endian architectures. These features make SQLite a popular choice as an Application File Format. Think of SQLite not as a replacement for Oracle but as a replacement for fopen() If you need a GUI for database management, you can install NAVICAT. SQLite is a compact library. With all features enabled, the library size can be less than 300KiB, depending on compiler optimization settings. (Some compiler optimizations such as aggressive function inlining and loop unrolling can cause the object code to be much larger.) If optional features are omitted, the size of the SQLite library can be reduced below 180KiB.
SQLite can also be made to run in minimal stack space (4KiB) and very little heap (100KiB), making SQLite a popular database engine choice on memory constrained gadgets such as cellphones, PDAs, and MP3 players. There is a tradeoff between memory usage and speed. SQLite generally runs faster the more memory you give it. Nevertheless, performance is usually quite good even in low-memory environments.
What's new in SQLite
- Support for UPDATE FROM following the PostgreSQL syntax.
- Increase the maximum size of database files to 281 TB.
- Extended the PRAGMA integrity_check statement so that it can optionally be limited to verifying just a single table and its indexes, rather than the entire database file.
- Added the decimal extension for doing arbitrary-precision decimal arithmetic.
- Enhancements to the ieee754 extension for working with IEEE 754 binary64 numbers.
- CLI enhancements:
- Added four new output modes: "box", "json", "markdown", and "table".
- The "column" output mode automatically expands columns to contain the longest output row and automatically turns ".header" on if it has not been previously set.
- The "quote" output mode honors ".separator"
- The decimal extension and the ieee754 extension are built-in to the CLI
- Query planner improvements:
- Add the ability to find a full-index-scan query plan for queries using INDEXED BY which previously would fail with "no query solution".
- Do a better job of detecting missing, incomplete, and/or dodgy sqlite_stat1 data and generates good query plans in spite of the misinformation.
- Improved performance of queries like "SELECT min(x) FROM t WHERE y IN (?,?,?)" assuming an index on t(x,y).
- Other:
- In WAL mode, if a writer crashes and leaves the shm file in an inconsistent state, subsequent transactions are now able to recover the shm file even if there are active read transactions. Before this enhancement, shm file recovery that scenario would result in an SQLITE_PROTOCOL error.
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- Mac OS X 10.4.11 or later
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"Cybersecurity researchers have discovered a critical vulnerability in widely used SQLite database software that exposes billions of deployments to hackers.
Dubbed as 'Magellan' by Tencent's Blade security team, the newly discovered SQLite flaw could allow remote attackers to execute arbitrary or malicious code on affected devices, leak program memory or crash applications...."
https://thehackernews.com/2018/12/sqlite-vulnerability.html
"Cybersecurity researchers have discovered a critical vulnerability in widely used SQLite database software that exposes billions of deployments to hackers.
Dubbed as 'Magellan' by Tencent's Blade security team, the newly discovered SQLite flaw could allow remote attackers to execute arbitrary or malicious code on affected devices, leak program memory or crash applications...."
https://thehackernews.com/2018/12/sqlite-vulnerability.html