On 11/20/07, Scott Krig <[EMAIL PROTECTED]> wrote:
> There are apparently no folks with the experience to answer the
> questions as given?
Those who have experience know better than to try to answer in an
e-mail what 1000 mails in the mailing list are not enough. The wiki
and documentation have mo
> Ken <[EMAIL PROTECTED]> wrote:
>
> Can you do a test load to a memory database. What is the performance
> (row/sec) of your data using an in memory database?
I tried a RAMDisk on Windows. I haven't tried at home on Linux.
I'm not sure if I tried the C API to RAMDisk database combination, o
> James Steward <[EMAIL PROTECTED]> wrote:
>
> Dennis Cote <[EMAIL PROTECTED]> wrote:
>
> > You have said you tried both the TCL and C APIs, but you didn't say if
> > you were using prepared insert statements in the C API. If not, that
> > will save the overhead of parsing and code generation f
Or you will need to get a faster disk drive! And more of them.
Consider a raid 0 system using striping. High speed fiber connects will also
be helpful.
Can you do a test load to a memory database. What is the performance
(row/sec) of your data using an in memory database?
Is th
I found a solution - apparently the DB file was just hosed. There were
actually duplicates stored somehow.
I dumped the database to a flat file and modified the IDs by hand then
imported the data into a new SQLite database. That seemed to do the
trick. I'm not sure how the corruption happened but
INSERT INTO invoice_items
(item_id,invoice_id,product_id,product_name,sku,description,quantity,price,cost,taxable,taxable2,format_price,format_total_price)
VALUES (NULL,899,1001975,'HD0001 - ASH - YL','','HOUSE
DIVIDED',1,800,450,'f','f','$8.00','$8.00')
Does this work?
INSERT INTO invoice_item
I'm not sure what it means, but here it is :
*** in database main ***
On page 2580 at right child: 2nd reference to page 2677
On tree page 9 cell 15: 2nd reference to page 2678
On tree page 9 cell 15: Child page depth differs
On tree page 9 cell 16: Child page depth differs
Page 2681 is never used
Dennis Cote <[EMAIL PROTECTED]> wrote:
Hi Dennis,
> You haven't said what your system is, but to record your data in real
> time you will need to insert about 70K records per second. That is high,
>
> but not impossible for SQLite, so I wouldn't give up yet. I have had
> SQLite doing 60K inse
Mitchell Vincent wrote:
select max(item_id) from invoice_items;
Produces "803" - but that is pretty clearly wrong when I look at the
dataset a count() returns 15503 records in that table.
min(item_id) is 1 (as expected).
I can insert records if I specify a unique item_id.
On Nov 20, 2007 5:5
James Steward wrote:
I can receive up to 2,000,000 records in about 30 seconds from
the field, and I can't seem to jam them into an SQLite database
any faster than about 100 seconds at best, on my system.
So unless anyone can suggest some magic I have not thought
of, I will have to abandon the
No triggers at all in the database. It's pretty vanilla..
On Nov 20, 2007 6:04 PM, <[EMAIL PROTECTED]> wrote:
> "Mitchell Vincent" <[EMAIL PROTECTED]> wrote:
>
> > Here we go. I am accessing the database through an ODBC connection
> > using the most recent version from Christian's site..
> >
> >
select max(item_id) from invoice_items;
Produces "803" - but that is pretty clearly wrong when I look at the
dataset a count() returns 15503 records in that table.
min(item_id) is 1 (as expected).
I can insert records if I specify a unique item_id.
On Nov 20, 2007 5:50 PM, Dennis Cote <[EMAIL
"Mitchell Vincent" <[EMAIL PROTECTED]> wrote:
> Here we go. I am accessing the database through an ODBC connection
> using the most recent version from Christian's site..
>
> The table schema :
>
> CREATE TABLE invoice_items (
> item_id INTEGER PRIMARY KEY,
> invoice_id int4,
> product_id int4,
James Steward <[EMAIL PROTECTED]> wrote:
> > Michael Ruck <[EMAIL PROTECTED]> wrote:
> >
> > I know that a natural join exists, but it is not automatic as
> > it seems to be in MySQL.
>
> Thanks , and thanks to all who replied to my questions.
>
> I've been testing SQLite's speed, for inserting
Tom Brigg's response to your question 2 was an excellent response.
Efficiently constructed queries will generally produce the best results.
Also, indexes on fields contained in WHERE clauses will generally produce
good results.
Lee
_
-Original Message
Mitchell Vincent wrote:
Here we go. I am accessing the database through an ODBC connection
using the most recent version from Christian's site..
The table schema :
CREATE TABLE invoice_items (
item_id INTEGER PRIMARY KEY,
invoice_id int4,
product_id int4,
product_name text ,
sku text ,
> Michael Ruck <[EMAIL PROTECTED]> wrote:
>
> I know that a natural join exists, but it is not automatic as
> it seems to be in MySQL.
Thanks , and thanks to all who replied to my questions.
I've been testing SQLite's speed, for inserting the type of data I
gather from the field. I've tried e
Here we go. I am accessing the database through an ODBC connection
using the most recent version from Christian's site..
The table schema :
CREATE TABLE invoice_items (
item_id INTEGER PRIMARY KEY,
invoice_id int4,
product_id int4,
product_name text ,
sku text ,
description text ,
quant
No doubt, it is obviously something that has been screwed up.
Unfortunately I'm in "hot fix" mode right now and the investigation
into why it happened will happen after I get this customer back up and
running. I have a feeling it has something to do with the ODBC driver
being used. I'll gather and
There are apparently no folks with the experience to answer the
questions as given?
-Original Message-
From: Tom Briggs [mailto:[EMAIL PROTECTED]
Sent: Tuesday, November 20, 2007 1:41 PM
To: sqlite-users@sqlite.org
Subject: RE: [sqlite] Performance tuning using PRAGMA, other methods
I think you just need to implement an INSTR(x,y,z) where X is the input string.
Y is the search string, and z is the search starting location. Typically
negative numbers indicate the end of the string to search backwards.
So
Substr(t1.col, 0, instr(t1.col, '.', -1) ) || '(' t2.col ||')' ||
"Mitchell Vincent" <[EMAIL PROTECTED]> wrote:
> I have a primary key that auto increments and has apparently
> overlapped back on to itself.
>
> INSERT into mytable(id,name) values(NULL,'test');
>
> ... is giving me "primary key must be unique" errors.
>
> How can I reset the sequence for a prim
re: Q1 - Maybe (hopefully) someone will prove me wrong, but I think
that your question is too broad to be answerable (unless you're actually
attempting to assemble a collection of optimal values in all possible
situations for all existing pragmas... ;shrug)
re: Q2 - At the risk of sounding
Why not try benchmarking the pragmas yourself and posting your
findings to the list?
http://www.sqlite.org/pragma.html
--- Scott Krig <[EMAIL PROTECTED]> wrote:
> Q1)) PRAGMA: Does anyone have experience and good results optimizing
> sqlite performance using PRAGMA's? If so, which ones, how we
Hi Mitchell,
I don't know that resetting the primary key would be productive, since
rollover of INTEGER PRIMARY KEY would not occur anywhere even remotely
close to 15000.
Are you sure you aren't somehow attempting an insert of a key that has
already been used -- perhaps because of some race condi
Richard Klein <[EMAIL PROTECTED]> wrote:
> > The previous statement is actually more general: SQLite
> > version 3.x.y can read and write any database created by
> > any prior version of SQLite.
>
> Even SQLite 2.w.z ?
No. Any prior 3.x.x version of SQLite.
--
To the point, the questions are:
Q1)) PRAGMA: Does anyone have experience and good results optimizing
sqlite performance using PRAGMA's? If so, which ones, how were they
used, and what was the performance increase?
Q2)) Other techniques: Any success stories on sqlite optimization
methods of any
I have a primary key that auto increments and has apparently
overlapped back on to itself.
INSERT into mytable(id,name) values(NULL,'test');
.. is giving me "primary key must be unique" errors.
How can I reset the sequence for a primary key? The table only has
about 15000 records in it and I've
solved... case of the missing ; after the UPDATE and INSERT statements.
On Nov 20, 2007 12:35 PM, P Kishor <[EMAIL PROTECTED]> wrote:
> I have a table
>
> CREATE TABLE foo (
> foo_id INTEGER PRIMARY KEY,
> foo_name TEXT,
> foo_text TEXT
> );
>
> I have created a virtual table to do full text
Which pragmas will be most effective (and what values you should use
for each) depends on what you're trying to do with the database.
Synchronous is important if you're writing frequently, for example, but
won't matter much in a read-only setting. Appropriate values for the
page_size and cache
I have a table
CREATE TABLE foo (
foo_id INTEGER PRIMARY KEY,
foo_name TEXT,
foo_text TEXT
);
I have created a virtual table to do full text search
CREATE VIRTUAL TABLE fts_foo (
USING fts2(foo_text);
I have populated this table
INSERT INTO fts_foo (rowid, foo_text)
VALUES (foo.foo_id, f
Daniel Önnerby schrieb:
This should be a simple task for any programming language to do once the
results has been retrieved.
Yes, of course. But it would be nice, if that could be done
on SQL level.
With the current expressions in SQLite I believe there is no way to do
this unless you extend
I know that a natural join exists, but it is not automatic as
it seems to be in MySQL.
> -Ursprüngliche Nachricht-
> Von: Dennis Cote [mailto:[EMAIL PROTECTED]
> Gesendet: Dienstag, 20. November 2007 18:32
> An: sqlite-users@sqlite.org
> Betreff: Re: [sqlite] Re: Performance tuning, and
What are the 'biggest bang for the buck' sqlite optimization techniques
to apply to a working system to tune performance?
Q1)) PRAGMA: Does anyone have experience and good results optimizing
sqlite performance using PRAGMA's? If so, which ones, how were they
used, and what was the performance in
Michael Ruck wrote:
Ah. I have been reading a PHP/MySQL book, that I thought said a MySQL
server would see the common column names and automagically join the 2.
Either I misremember what the book said (it's not with me
here), or this
is a feature of MySQL, not present in SQLite. Anyway, what
This should be a simple task for any programming language to do once the
results has been retrieved.
With the current expressions in SQLite I believe there is no way to do
this unless you extend SQLite with your own "string_find_last" or
"replace_last" function.
Alexander Skwar wrote:
Hello.
Hello.
Suppose I've got tables like this:
sqlite> .schema t1
CREATE TABLE t1 (id integer primary key not null, name);
sqlite> .schema t2
CREATE TABLE t2 (t1id integer, txt STRING NOT NULL);
Filled with:
sqlite> select * from t1;
1|foo.bar.boing
Hi,
Yes that does seem to bypass the login prompt. It says "logging in to...".
But still can't actually connect to server.
windows has only recently been installed (winxp sp2). also get same problem
with firewall turned off.
Any other reason why I can't connect to server?
Once again you're missing the point.
Of course you can get a malloc/free implementation that performs
garbage collection, such as Boehm's conservative GC. But C garbage
collection and malloc/free memory fragmentation are quite different
things. You can still get heavily fragmented memory with a
The sqlite3.h file is in sqlite-source-3_5_2.zip.
That zip can be found in http://www.sqlite.org/download.html
Good luck!
I wanted to build a C app, copied the example C code from the
Documentation on the web site, and downloaded the prebuilt binaries.
There's no header in with the dll and def
hi everybody,
the magic spell worked, but onky for me, not for my server:
at the moment i have problems with my (free) dyndns account.
my server (a little nslu2 in my living room) was online for some hours
yesterday but disappeared again this morning ...
until i solved my problem here are the te
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