Small. Fast. Reliable.
Choose any three.
Choose any three.
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SQLite Shared-Cache Mode
(sharedcache.html)
1.1. Use of shared-cache is discouraged
... Most use cases for shared-cache are better served by
WAL mode.
Shared-cache mode was invented in 2006 at the request of developers
of Symbian. Their problem was that
if the contacts database on the phone was being synced ...
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SQLite Older News
(oldnews.html)
... 2011-05-19 - Version 3.7.6.3
SQLite version 3.7.6.3 is a patch release that fixes a
single bug
associated with WAL mode. The bug has been in SQLite ever since WAL
was added, but the ...
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The Tcl interface to the SQLite library
(tclsqlite.html)
... Note that SQLite only allows a single WAL hook.
By default this single WAL hook is used for the auto-checkpointing. If you
set up an explicit WAL hook, then that one WAL hook must ensure that checkpoints
are occurring ...
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The Checksum VFS Shim
(cksumvfs.html)
4. Usage
... If the database is in WAL mode, you should shutdown and
reopen all database connections before continuing.
From the CLI, use the ".filectrl reserve_bytes 8" command,
followed by "VACUUM;".
Note that SQLite allows the number of reserve-bytes to be ...
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VACUUM
(lang_vacuum.html)
... When overwriting the original, a rollback
journal or write-ahead log WAL file is used just as it would be for any
other database transaction. This means that when VACUUMing a database,
as much as twice the size of the ...
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Compile-time Options
(compile.html)
2. Recommended Compile-time Options
... However, in WAL mode, complete
database integrity is guaranteed with PRAGMA synchronous=NORMAL. With
PRAGMA synchronous=NORMAL in WAL mode, recent changes to the database might
be rolled back by a power loss, but the database will not be corrupted ...
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Transaction
(lang_transaction.html)
... EXCLUSIVE and IMMEDIATE are the same
in WAL mode, but in other journaling modes, EXCLUSIVE prevents
other database connections from reading the database while the
transaction is underway.
2.3. Implicit versus explicit transactions
An implicit transaction (a transaction that ...
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35% Faster Than The Filesystem
(fasterthanfs.html)
2.2. Write Performance Measurements
... The next chart compares SQLite database updates in WAL mode
against raw direct-to-disk overwrites of separate files on disk.
The PRAGMA synchronous setting is NORMAL.
All database writes are in a single transaction.
The timer for the database ...
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SQLite Over a Network, Caveats and Considerations
(useovernet.html)
... Host an SQLite database in WAL mode, but do
all reads and writes from processes on the same machine
that stores the database file.
Implement a proxy that runs on the database machine that
relays read/write requests from remote ...
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Books About SQLite
(books.html)
... It also describe how the
workings of SQLite, and in particular the journal and WAL, can be used
to ascertain what has happened in a manner that cannot be determined
from the data alone. The book covers basic SQL queries ...
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