Documentation Source Text

doc {DataTypes} {datatype3.html} {
  SQLite version 3 introduces the concept of manifest typing, where the
  type of a value is associated with the value itself, not the column that
  it is stored in.
  This page describes data typing for SQLite version 3 in further detail.
}


heading {SQLite Features and Extensions} {
  Pages describing specific features or extension modules of SQLite.
}
doc {8+3 Filenames} {shortnames.html} {
  How to make SQLite work on filesystems that only support 
  8+3 filenames.
}
doc {Autoincrement} {autoinc.html} {
  A description of the AUTOINCREMENT keyword in SQLite, what it does,
  why it is sometimes useful, and why it should be avoided if not
  strictly necessary.
}
doc {Backup API} {backup.html} {
  The [sqlite3_backup_init | online-backup interface] can be used to
  copy content from a disk file into an in-memory database or vice
  versa and it can make a hot backup of a live database.  This application
  note gives examples of how.
}
doc {Command-Line Shell} {cli.html} {
  Notes on using the "sqlite3.exe" command-line interface that
  can be used to create, modify, and query arbitrary SQLite
  database files.
}
doc {Error and Warning Log} {errlog.html} {
  SQLite supports an "error and warning log" design to capture information
  about suspicious and/or error events during operation.  Embedded applications
  are encouraged to enable the error and warning log to help with debugging
  application problems that arise in the field.  This document explains how
  to do that.
}
doc {Foreign Key Support} {foreignkeys.html} {
  This document describes the support for foreign key constraints introduced
  in version 3.6.19.
}
doc {Full Text Search} {fts3.html} {
  A description of the SQLite Full Text Search (FTS3) extension.
}
doc {Internal versus External Blob Storage} {intern-v-extern-blob.html} {
  Should you store large BLOBs directly in the database, or store them
  in files and just record the filename in the database?  This document
  seeks to shed light on that question.
}
doc {Limits In SQLite} {limits.html} {
  This document describes limitations of SQLite (the maximum length of a
  string or blob, the maximum size of a database, the maximum number of
  tables in a database, etc.) and how these limits can be altered at
  compile-time and run-time.
}
doc {Memory-Mapped I/O} {mmap.html} {
  SQLite supports memory-mapped I/O.  Learn how to enable memory-mapped
  I/O and about the various advantages and disadvantages to using
  memory-mapped I/O in this document.
}
doc {Multi-threaded Programs and SQLite} {threadsafe.html} {
  SQLite is safe to use in multi-threaded programs.  This document
  provides the details and hints on how to maximize performance.
}
doc {Null Handling} {nulls.html} {
  Different SQL database engines handle NULLs in different ways.  The
  SQL standards are ambiguous.  This (circa 2003) document describes
  how SQLite handles NULLs in comparison with other SQL database engines.
}
doc {Partial Indexes} {partialindex.html} {
  A partial index is an index that only covers a subset of the rows in
  a table.  Learn how to use partial indexes in SQLite from this document.
}
doc {R-Trees} {rtree.html} {
  A description of the SQLite R-Tree extension. An R-Tree is a specialized
  data structure that supports fast multi-dimensional range queries often
  used in geospatial systems.
}
doc {Run-Time Loadable Extensions} {loadext.html} {
  A general overview on how run-time loadable extensions work, how they
  are compiled, and how developers can create their own run-time loadable
  extensions for SQLite.
}
doc {Shared Cache Mode} {sharedcache.html} {
  Version 3.3.0 and later supports the ability for two or more
  database connections to share the same page and schema cache.
  This feature is useful for certain specialized applications.
}
doc {Unlock Notify} {unlock_notify.html} {
  The "unlock notify" feature can be used in conjunction with
  [shared cache mode] to more efficiently manage resource conflict (database
  table locks).
}
doc {URI Filenames} {uri.html} {
  The names of database files can be specified using either an ordinary
  filename or a URI.  Using URI filenames provides additional capabilities,
  as this document describes.

}
doc {WITHOUT ROWID Tables} {withoutrowid.html} {
  The WITHOUT ROWID optimization is a option that can sometimes result
  in smaller and faster databases.
}
doc {Write-Ahead Log (WAL) Mode} {wal.html} {
  Transaction control using a write-ahead log offers more concurrency and
  is often faster than the default rollback transactions.  This document
  explains how to use WAL mode for improved performance.
}

heading {Advocacy} {
  Documents that strive to encourage the use of SQLite.



}
doc {SQLite As An Application File Format} {appfileformat.html} {
  This article advocates using SQLite as an application file format

  in place of XML or JSON or a "pile-of-file".
}
doc {Well Known Users} {famous.html} {
  This page lists a small subset of the many thousands of devices
  and application programs that make use of SQLite.
}






heading {SQLite Technical/Design Documentation} {
  These documents are oriented toward describing the internal

  implementation details and operation of SQLite.  
}



doc {Temporary Files Used By SQLite} {tempfiles.html} {
  SQLite can potentially use many different temporary files when
  processing certain SQL statements.  This document describes the
  many kinds of temporary files that SQLite uses and offers suggestions
  for avoiding them on systems where creating a temporary file is an
  expensive operation.

  how to port SQLite to new platforms.
}

doc {Locking And Concurrency<br>In SQLite Version 3} {lockingv3.html} {
  A description of how the new locking code in version 3 increases
  concurrency and decreases the problem of writer starvation.
}

doc {Isolation In SQLite} {isolation.html} {
  When we say that SQLite transactions are "serializable" what exactly
  does that mean?  How and when are changes made visible within the
  same database connection and to other database connections?
}

doc {Overview Of The Optimizer} {optoverview.html} {
  A quick overview of the various query optimizations that are
  attempted by the SQLite code generator.
}
doc {The Next-Generation Query Planner} {queryplanner-ng.html} {
  Additional information about the SQLite query planner, and in particular
  the redesign of the query planner that occurred for version 3.8.0.
}

doc {Architecture} {arch.html} {
  An architectural overview of the SQLite library, useful for those who want
  to hack the code.
}

doc {VDBE Opcodes} {opcode.html} {
  This document is an automatically generated description of the various
  opcodes that the VDBE understands.  Programmers can use this document as
  a reference to better understand the output of EXPLAIN listings from
  SQLite.
}
doc {Virtual Filesystem} {vfs.html} {
  The "VFS" object is the interface between the SQLite core and the
  underlying operating system.  Learn more about how the VFS object
  works and how to create new VFS objects from this article.
}
doc {Virtual Tables} {vtab.html} {
  This article describes the virtual table mechanism and API in SQLite and how
  it can be used to add new capabilities to the core SQLite library.
}

doc {SQLite File Format} {fileformat2.html} {
  A description of the format used for SQLite database and journal files, and
  other details required to create software to read and write SQLite 
  databases without using SQLite.
}

doc {Compilation Options} {compile.html} {
  This document describes the compile time options that may be set to 
  modify the default behavior of the library or omit optional features
  in order to reduce binary size.
}

heading {Upgrading SQLite, Backwards Compatibility}

doc {Moving From SQLite 3.5 to 3.6} {35to36.html} {
  A document describing the differences between SQLite version 3.5.9


  and 3.6.0.
}
doc {Moving From SQLite 3.4 to 3.5} {34to35.html} {

  A document describing the differences between SQLite version 3.4.2

  and 3.5.0.
}
doc {Release History} {changes.html} {
  A chronology of SQLite releases going back to version 1.0.0
}
doc {Backwards Compatibility} {formatchng.html} {
  This document details all of the incompatible changes to the SQLite
  file format that have occurred since version 1.0.0.
}

doc {Private Branches} {privatebranch.html} {
  This document suggests procedures for maintaining a private branch
  or fork of SQLite and keeping that branch or fork in sync with the
  public SQLite source tree.
}


heading {Obsolete Documents} {


  The following documents are no longer current and are retained
  for historical reference only.
  These documents generally pertain to out-of-date, obsolete, and/or
  deprecated features and extensions.
}
doc {Asynchronous IO Mode} {asyncvfs.html} {
  This page describes the asynchronous IO extension developed alongside
  SQLite. Using asynchronous IO can cause SQLite to appear more responsive
  by delegating database writes to a background thread.  <i>NB:  This
  extension is deprecated.  [WAL mode] is recommended as a replacement.</i>
}