August 2010
Intermediate to advanced
526 pages
23h 39m
English
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Name
page_size — Set the size of a database page
Common Usage
PRAGMA [database.]page_size; PRAGMA [database.]page_size =bytes;
Description
The page_size pragma gets or sets the size of the
database pages. The
size must be a power of two. By default, the allowed
sizes are 512, 1024, 2048, 4096, 8192, 16384, and 32768 bytes.
This value becomes fixed once the database is initialized. The
only way to alter the page size on an existing database is to
set the page size and then immediately bytes
VACUUM the database.
The default page size is calculated
from a number of factors. The default page size starts at 1024
bytes. If the datatype driver indicates that the native I/O
block of the filesystem is larger, that larger value will be
used up to the maximum default size, which is normally set to
8192. These values can be altered
with the SQLITE_DEFAULT_PAGE_SIZE, SQLITE_MAX_DEFAULT_PAGE_SIZE, and SQLITE_MAX_PAGE_SIZE
compiler-time directives.
The end result is that the page size for file-based databases will typically be between 1 KB and 4 KB on Microsoft Windows, and 1 KB on most other systems, including Mac OS X, Linux, and other Unix systems.
See Also
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.