Long time SQLite user but I don't think I have ever tried to do an
in-memory database before.
Just upgraded to 3.8.3.1 but I am not having any other failures with
existing code so I don't think that is any part of the problem.
I am trying to open the database with sqlite3_open16() using a filename
Date: Wed, 28 Aug 2013 14:21:24 -0400
From: Richard Hipp d...@sqlite.org
The latest check-in on trunk adds a new windows VFS module called
win32-longpath which accepts the full-length 32KB pathnames. Add the
string win32-longpath as the 4th argument to sqlite3_open_v2() (on
windows only, of
SQLite3 in my product since 2009.
Highly recommended.
Jeff Archer
Vice President of Software Engineering
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin
Thanks for everyone's help and thoughts on this issue.
My findings on Windows 7 Pro 64 using a PCI based SSD is that for my
smallish image the BLOBs were faster than individual files.
Basically, in line with a table that someone posted earlier in this
thread.
After many experiments, with many
From: James K. Lowden jklow...@schemamania.org
To: sqlite-users@sqlite.org
Your experiment is telling you different: transaction control costs more
than I/O.
But shouldn't transactions be disabled when journal_mode = off? Maybe that
is a faulty assumption. If so, what is the point of
I have previously made an apparently bad assumption about this so now I
would like to go back to the beginning of the problem and ask the most
basic question first without any preconceived ideas.
This use case is from an image processing application. I have a large
amount of intermediate data
Date: Thu, 28 Mar 2013 14:13:51 +0100
From: ibrahim ibrahim.a...@googlemail.com
... You should compare
a) Journal mode=on w/wo single transaction
b) Journal mode=off w/wo single transaction
So, this means I can use transaction when I have journal_mode = off?
I did not understand that this was
On Fri, Mar 29, 2013 at 4:05 PM, Simon Slavin slav...@bigfraud.org wrote:
No. The two things have nothing to do with one-another. Transactions are
about grouping changes together
so that either they all happen or none happen. Journalling is about surviving
through crashes and
power-failures,
On Fri, Mar 29, 2013 at 4:46 PM, Richard Hipp d...@sqlite.org wrote:
On Fri, Mar 29, 2013 at 4:41 PM, Michael Black mdblac...@yahoo.com wrote:
I think many people would tell you not to store your images in your
database.
Just store a filepath to them.
That will speed things up quite a bit
On Wed, Mar 27, 2013 at 6:35 PM, Simon Slavin slav...@bigfraud.org wrote:
Reasonable figures. With 5764 writes to the disk in separates transactions
you have quite a lot of reading of data plus 5764 attempts to update the
database file. The updates have to be done in the right order, and
On Thu, Mar 28, 2013 at 8:35 AM, Niall O'Reilly niall.orei...@ucd.ie wrote:
On 28 Mar 2013, at 12:09, Jeff Archer wrote:
But my most basic question remains. Why is single transaction faster
than PRAGMA journal_mode = off?
Seems to me that with no journal there should only be single set
On Thu, Mar 28, 2013 at 8:24 AM, ibrahim ibrahim.a...@googlemail.com wrote:
On 28.03.2013 13:09, Jeff Archer wrote:
On Wed, Mar 27, 2013 at 6:35 PM, Simon Slavin slav...@bigfraud.org
wrote:
Reasonable figures. With 5764 writes to the disk in separates
transactions you have quite a lot
If all connections (1 per thread) of all processes (multiple simultaneous)
issue command PRAGMA journal_mode = off, is access to a common database
file located on the local machine still synchronized correctly between the
random accesses (reads and writes) occurring across all?
transactions (default atomic commit) it takes 17.7
seconds.
When I set journal_mode = off, same operation takes 5.5 seconds.
If I do all 5764 inserts within a single transaction only 2.5 seconds.
Jeff Archer
Vice President of Software Engineering
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
On Wed, Mar 27, 2013 at 5:46 PM, David King dk...@ketralnis.com wrote:
I am populating a database with 5764 records using the exact same data set
each time into a newly created file.
When I use no explicit transactions (default atomic commit) it takes 17.7
seconds.
When I set
Documentation doesn't make this clear. Does PRAGMA journal_mode = OFF;
affect a single connection or will it affect all connections in my process?
___
sqlite-users mailing list
sqlite-users@sqlite.org
Will SQLite4 be capable of reading a SQLite3 database to facilitate
upgrade? (I'm guessing 'no')
I assume SQLite4 will be distributed in a familiar amalgamation format.
Will it be feasible to include the amalgamation of both SQLite3 and SQLite4
into the same application to create an upgrade
There was recently a post where someone was trying to update the ranking of
records in a table and someone else presented a clever view which did the
ranking and thus required no table update. I wanted to try and understand
how this view worked but when I have looked back to find it, I can't.
in the C API that might be used to implement this functionality.
Could someone please point me to some information on how I might make my
product be able to recover from this situation.
SQLite3 version 3.7.13
Windows 7 x64
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
I assume that the amalgation exists as single files before it is combined
into one file.
Is is possible to get these individual files so that I can build a debug
version because Visual Studio debugger does not handle well the 138244 line
amalgation file?
Jeff Archer
Nanotronics Imaging
jsarc
. trips me up. I
was hoping there is a way to get the individual files after they have been
formulated by the unix-like development tools but before they are combined
into the amalgamation file.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
On Fri, Sep 21, 2012 at 4:01 PM, Nico Williams n...@cryptonector.comwrote:
Install Cygwin, use that to make the amalgamation (after you've made
whatever changes to the canonical sources), then build the amalgation
in native Windows.
Please excuse my ignorance.
OK. I have Cygwin. Fossil. I
as it was created by the first process and I was assuming that the
IF NOT EXISTS would be preventing it from actually doing anything but now
I am believing that executing this statement even when the table exists is
causing SQLite to think the schema has changed.
Does this seem plausible?
Jeff Archer
the SQLITE_CONFIG_LOG callback is
inconsistent with the success indicated by SQLITE_DONE.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin
Igor Tandetnik itandetnik at mvps.org Thu Jun 28 09:38:27 EDT 2012
My guess is that a) you have prepared your statement with
sqlite3_prepare_v2 (as opposed to sqlite3_prepare)...
Statement was prepared with sqlite3_prepare16_v2()
Database file was created only moments earlier.
Jeff Archer
moments before.
My biggest question is: Why after this error being indicate through the
SQLITE_CONFIG_LOG callback would the sqlite3_step() succeeded?
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
Pavel Ivanov paivanof at gmail.com Fri Jun 29 17:06:42 EDT 2012
Because SQLite successfully re-prepared this statement behind the
scenes and thus was able to successfully finish sqlite3_step()
function.
What could cause it to re-prepare the statement?
Is this something I need to find and fix?
Simon Slavin slavins at bigfraud.org Fri Jun 29 17:16:36 EDT 2012
Do you do the _prepare() first, then make a change to the database schema
? For instance
Start of app
Prepare the INSERT statement
CREATE TABLE
Bind the INSERT statement
Step the INSERT statement
No.
Create Table
Then in a
Igor Tandetnik itandetnik at mvps.org Thu Jun 28 09:38:27 EDT 2012
My guess is that a) you have prepared your statement with
sqlite3_prepare_v2 (as opposed to sqlite3_prepare)...
Statement was prepared with sqlite3_prepare16_v2()
Database file was created only moments earlier.
Jeff Archer
function, Execute(), that does the Prepare, Bind, Step,
Reset, Finalize sequence.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman
](ScanID, Timestamp,
EndTime, Result) VALUES(NULL, @Timestamp, @Timestamp, @Result);] database
schema has changed
SQLITE_VERSION3.7.13 - amalgamation
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
___
sqlite-users mailing list
.
Windows 7 64bit. Visual Studio 2010. Real HDD not SSD. The file is on
local machine but is opened using a network path. i.e.
\\MACHINENAME\Data\Calibration.db
Thank you in advance for your time on this matter.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
yy_reduce
1..\..\Bin\x64\Debug\SqlUtils.dll : fatal error LNK1120: 8 unresolved externals
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin
[-1].minor.yy203, all);
Should be enclosed in...
#ifdef SQLITE_OMIT_TRIGGER
sqlite3FinishTrigger(pParse, yymsp[-1].minor.yy203, all);
#endif
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
positives in the leaked
memory. Your said that your are using GetProcAddress() to make calls which
makes
me think you *may* be getting to these false positives. Basically, I believe
it
comes down to allocating memory in one dll and deallocating in another.
Jeff Archer
Nanotronics Imaging
jsarc
builds run
most code significantly slower than the release builds.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite
insert more than your RAM size into an in memory
database?
(I'm particularly interested in the Windows context).
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http
Tue Apr 19 18:35:27 GMT 2011 Danny dragonslayer2k at yahoo.com
Depends on access type. If accessing sequentially, paging would be minimal,
that is, you would process the segment that fits into memory, then page
in another segment and process that, etc., etc.
Even so it would now be accessed
() if the error is not ERROR_FILE_NOT_FOUND
and this appears to eliminate the crash.
Could someone please advise on how good or bad of an idea this change is?
How well is SQLite tested on Windows 7 64 bit?
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819-4615
sqlite3_extended_errcode()?
Is 3338 an extended error code?Do I need to use sqlite3_open_v2 to get the
extended error code?
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
has any ideas.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
From: Patrick Earl pate...@patearl.net
Subject: Re: [sqlite] Lack of decimal support
If SQLite can't decide on a base-10 format itself, perhaps the answer
lies in enhancing the API to allow for custom type storage and
operators.
So, like a virtual type interface. This would be a nice feature.
On Wed, Mar 16, 2011 at 5:59 PM, Simon Slavin slav...@bigfraud.org wrote:
You should almost never be creating indexes on the fly. Bear in mind that if
SQLite finds a search that would be better with an index, it creates it
itself and it is far better at working out the best index than you
to accomplish this without resorting to
explicit query of the sqlite_master table?
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819-4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman
, Images.Y + Defects.Y as DefectY
from Defects join Images on Defects.ImageID = Images.ImageID
I believe that the data is all stored such that the first stored defect for
each ImageID will have the lowest X,Y values. At least for now this
assumption is probably good enough.
Jeff
From: Igor Tandetnik [mailto:itandet...@mvps.org]
Sent: Tuesday, March 01, 2011 5:47 PM
On 3/1/2011 5:01 PM, Jeff Archer wrote:
And this select which I would like to modify to only return lowest X,Y
value for each ImageID.
What does lowest mean? If you have two points (100, 200) and (200
handy technique for me know as I am still a
SQL beginner.
--
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
level possible and make it always compile warning free. Why would you NOT
want the compiler to point out potential issues. This lets the developer
basically make an approval by inserting a cast or whatever.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
to and including 2010 have issues with
source files longer than 64K lines. The editing works OK but the debugger
cannot locate code lines and it confuses Intellisense.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite
Here is my existing schema. I would like to change this and remove the
NumDefects from the [Analysis] table.
To do this I need to update the [vwAnalysis] view to determine the number of
defects from the [Defects] table by the AnalysisID.
I can't seem to get the right select for the new version
Date: Sun, 13 Feb 2011 22:14:29 -0500
From: Pavel Ivanov paiva...@gmail.com
I do a transaction on connection 1 using BEGIN IMMEDIATE, some rows updated,
COMMIT.
Then, when I attempt same sequence on connection 2, when I do first call to
step
to execute begin transaction and it never returns.
, when I do first call to
step
to execute begin transaction and it never returns.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman
and I have tried it with
appending the digits 1 to 6 and making 6 calls to bind with same result.
My app is 64 bit and SQLite Expert is 32 bit.
Any thought or suggestion will be appreciated as I am not sure how to proceed.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
, '10X' , 'CFI LU
Plan Fluor BD 10X' , 10.0, 0.30, 15.0);
Thank you. This is very convenient. And seems so obvious now that I have seen
it. Not sure why I didn't figure this out on my own.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
Just my two cents...
A SQLite Server would be userful. I have considered creating this myself. I
have thought that it would need to be kept zero config and it should be
provided
in amalgamation form to keep simple to embed in applications. Wouldn't need
incredible throughput as it is a
From: Simon Slavin slav...@bigfraud.org Date: Tue, 21 Dec 2010 14:19:25 +
This was my first thought when I considered implementing an SQLite-over-IP
protocol: that there was no user model and therefore no need for passwords.
Mounting a database on the server would mean that anyone who knew
My only guess is that basic_string::c_str() doesn't really provide a pointer
to
a null-terminated c-style string, but a facsimile of one that SQLite doesn't
like.
c_str() provides pointer to the data that string has with additional
null byte added at the end. That's it. Whether it is a
From: john darnell john.darn...@walsworth.com
Date: Mon, 29 Nov 2010 17:10:04 -0600
I just added it to a Visual Studio 8 project, turned off the use of
precompiled
headers (the project is a C++ project) and compiled the SQLite.c file without
any errors. Is it really that easy, or am I about
Thank you, Simon and Owen.
I have tried and both solutions work equally well. I have actually used C code
to make the calculation as I pull out the data.
But to help further my understanding of SQL/SQLite, can anyone comment on
potential performance differences of the 2 SQL solutions.
CREATE
and nTilesY so I think I do
not know how to correctly reference these.
Thank you.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman
Offset_Y) AS Height,
Patterns.Description
FROM Tiles INNER JOIN Patterns ON Tiles.PatternID = Patterns.PatternID GROUP
BY
Tiles.PatternID;
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
of unique Y offsets in a pattern like so:
SELECT COUNT(Offset_Y) FROM (SELECT DISTINCT Offset_Y FROM Tiles WHERE
PatternID
= 1);
Is it possible to have a single query that will generate a row for each
PattenID, COUNT(Offset_Y) combination?
i.e.
1 | 29
2 | 37
3 | 45
Thanks,
Jeff Archer
Nanotronics
it does is allow the business rules to be packaged as a complete unit with
the data and I claim that would be better design and more maintainable over the
life of the project.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
.
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
and I am
very committed to its use in my projects. Many thanks to all who make SQLite
possible. It is an excellent product. And the support available through this
mailing list is truly top notch. I have paid (sometimes dearly) for a lot less
competent and complete support.
Jeff Archer
I am using SQLite from C++ and I have implemented a class to manager nested
transactions using savepoints. I have currently implemented as a stack of
transactions such that the first Begin uses BEGIN IMMEDIATE, while subsequent
levels use SAVEPOINT T where is a sequentially increasing
15, 30
Jeff Archer
Nanotronics Imaging
jsarc...@nanotronicsimaging.com
330819.4615
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
I'm new to SQLite but have some experience with MS SQL Server. I am looking
for
a quick confirmation from expert that my planed use of SQLite is reasonable and
maybe point out if there are any gotchas. I've done some prototyping and tried
most of this out but it is based on how I've done
68 matches
Mail list logo
