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SQLite Older News
(oldnews.html)
... The traditional rollback-journal is still used as the default so there
should be no visible change for legacy programs. But newer programs
can take advantage of improved performance and concurrency by enabling
the WAL journaling mode.
SQLite version 3 ...
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Recent SQLite News
(news.html)
... This is less than half the number of CPU cycles used as
recently as 8 years ago. (The graph below shows SQLite using
a rollback journal which uses fewer CPU cycles at the expense
of extra I/O. The benchmark ...
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35% Faster Than The Filesystem
(fasterthanfs.html)
2.2. Write Performance Measurements
... 10K blobs, avg size 10KB, random order,
journaling disabled, synchronous OFF.
In all of the write tests, it is important to disable anti-virus software
prior to running the direct-to-disk performance tests. We found that
anti-virus software ...
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TH3
(th3.html)
1. Overview
... TH3 exercises SQLite in a variety of run-time configurations
(UTF8 vs UTF16, different pages sizes, varying journal modes, etc.)
TH3 achieves 100% branch test coverage (and 100%
MC/DC)
over the SQLite core.
(Test coverage of extensions such as ...
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The C language interface to SQLite Version 2
(c_interface.html)
... But
additional temporary files may be created during the execution of
an SQL command in order to store the database rollback journal or
temporary and intermediate results of a query.
The return value of the sqlite_open function is a
pointer ...
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WAL-mode File Format
(walformat.html)
1.2. The Write-Ahead-Log or "-wal" File
The write-ahead log or "wal" file is a roll-forward journal
that records transactions that have been committed but not yet applied
to the main database. Details on the format of the wal file are
describe in the WAL ...
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The SQLite Bytecode Engine
(opcode.html)
4. The Opcodes
... An Abort is safe if either there have been no writes, or if there is
an active statement journal.
Add
Add the value in register P1 to the value in register P2
and store the result in register P3.
If ...
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The Tcl interface to the SQLite library
(tclsqlite.html)
... Note that
if the previous process to have the database did not exit cleanly
and left behind a hot journal, then the write permission is required
to recover the database after opening, and the database cannot be
opened read-only ...
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Dynamic Memory Allocation In SQLite
(malloc.html)
4. Mathematical Guarantees Against Memory Allocation Failures
... J. M. Robson and the results published as:
J. M. Robson. "Bounds for Some Functions Concerning Dynamic
Storage Allocation". Journal of the Association for
Computing Machinery, Volume 21, Number 8, July 1974,
pages 491-499.
Let us use the following ...
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The Virtual Database Engine of SQLite
(vdbe.html)
... Starting a transaction also creates a rollback journal. A
transaction must be started before any changes can be made to the
database.
The instruction VerifyCookie
checks cookie 0 (the database schema version) to make sure it is equal
to P2 ...
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