ine on simulator.
>
>Can anyone provide any input on this?
ASCII versus UTF-8 or UTF-16?
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p, I cannot just drop the
>> tables. ( As the table which are present in the existing data base is
>> not known. )
>>
>> I am using sqlite3wrapped C++ library APIs.
>>
>> Thanks and Regards,
>> Souvik
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On Tue, 26 May 2009 14:44:25 +0800, wying wy
<joyousl...@gmail.com> wrote:
>Hi
>
>May I know if we can create index on a View?
You can't create an index on a VIEW.
A VIEW can be seen as a stored SELECT statement.
>Thanks in advance.
>wying
--
s simple, but not for me.
This is an n:m relationship.
If group has more attributes (columns) than just its number,
you need a third table: person_group.
Then join person with person_group where group_id != 1;
The person_group table could be called membership, if you
like.
>Thanks in advance
&g
QLite sort
the resultset before it can return the first row in the
resultset. Need I say more?
http://www.sqlite.org/cvstrac/wiki?p=ScrollingCursor
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gt;Table: task_status_log => (id, fk_task_log, status_code, time_stamp)
>
>And in psudo SQL:
>
>TRIGGER ON INSERT INTO task_log:
>BEGIN
>INSERT INTO task_fifo (fk_task_log) VALUES (NEW.id)
>END;
>
>TRIGGER ON DELETE FROM task_fifo:
>BEGIN
>
par = $this->prepare($sql);
if (is_array($parlist)){
/* we got a text array with params */
foreach ($parlist as $aval){
$stpar->execute(array(':jobid' =>
$jobid, ':partx' => $aval));
}
} else if (is_object($parlist)) {
/* we got a resultset from a query as paramlist
*/
while ($row = $parlist->fetch(PDO::FETCH_NUM)){
$stpar->execute(array(':jobid' =>
$jobid, ':partx' => $row[0]));
}
}
} else {
}
$this->commit();
/*
* ugly code to launch the dispatcher asynchronously using
* Windows schtasks.exe is left to the imagination of the reader
*/
}
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, is that the same application
('d') uses the same tag more then once. Is that on purpose?
In other words, it's not completely clear to me what you are
trying to accomplish.
>Regards,
>-steffen
>
>
>Kees Nuyt wrote:
>>
>> On Sun, 10 May 2009 13:51:29 -0700 (PDT), ck
FROM tag_link
INNER JOIN app_name ON (app_name.id = tag_link.app_id)
GROUP BY tag_link.app_id;
app_name.id|app_name.app|nrtags
30|a|1
39|b|1
49|t|2
331|d|3
>The parser returns no error, only seems to freeze. Tipps, hints – all kind
>of advice.
>sincerely, ckeen
Hope this helps.
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an SQLite
database. Very basic but fully functional nevertheless.
http://www.sqlite.org/cvstrac/wiki?p=SampleCode
Example C code for creating / writing to / reading from a
database.
>TIA,
>Nuno Magalhães
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On Wed, 6 May 2009 23:24:00 +0200, Daniel Wolny
<dan...@szelka.net> wrote:
>2009/5/6 Kees Nuyt <k.n...@zonnet.nl>:
>> On Wed, 6 May 2009 23:01:24 +0200, Daniel Wolny
>> <dan...@szelka.net> wrote:
>> It should be possible, sqlite sends its output to std
arameter on the
sqlite command line? As in:
# sqlite3 my.db
See also:
http://www.sqlite.org/quickstart.html
If you leave out the databasefilename, sqlite uses an
in-memory database, which is destroyed as soon as you
leave/quit/exit the command li
put to stdout, so
it works like any other unix utility.
Just give it a go. Experiment.
And enjoy.
>Thanks in advance
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m not sure what you mean here. Guessing:
To sort by the third column of your result set, use:
SELECT * FROM mytable ORDER BY name_of_third_column;
or
SELECT * FROM mytable ORDER BY 3;
>Thanks in advance.
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's never printed anything. I even reinstalled my os system.
>I am pretty much confused with it. Could anyone give me some advice, please?
In your shell, type:
which sqlite3
Does the result point to the result of yur compilation of
sqlite3 ?
>Thanks so much.
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On Wed, 6 May 2009 00:40:22 -0500, "Jay A. Kreibich"
<j...@kreibi.ch> wrote:
>On Tue, May 05, 2009 at 11:46:38PM +0200, Kees Nuyt scratched on the wall:
>> On Tue, 5 May 2009 16:55:42 -0400, Pavel Ivanov
>> <paiva...@gmail.com> wrote:
>>
>>
re right, it doesn't make sense.
@Joannek: When using group by, your select columns can only
use aggregate functions and the columns you group by.
Perhaps you meant to use ORDER BY here ?
>Pavel
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;out that "database disk image is malformed".
> Is there any command to check if the index
>or database in good condition.
PRAGMA integrity_check;
http://www.sqlite.org/pragma.html#debug
>Thanks,
>JP
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or.
On Unix the Control-D by itself is enough.
>Pavel
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ix systems
> - I don't know if Control-D works on windows)
Control-D doesn't work in sqlite3.exe on windows, Control-C
does, both in the windows shell (CMD.EXE) and in msys
(mingw32) bash.
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cross Attached
Databases (2008-01-24 11:56:16 UTC).
Cheers,
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@hwaci.com>
Date: Mon, 20 Apr 2009 06:53:37 -0400 :
http://wiki.tcl.tk/21708
>They're very nice :)
>
>Cheers,
>Andrey
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the optimum for your environment and
application.
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this DB?
Roger Binns is right. Just another hint:
Search for "adjacency model" and "nested set", which are the
two most common models.
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ng else, start with:
http://www.sqlite.org/sitemap.html
>Cheers,
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For a normal application, you wouldn't have to drop tableB,
but just insert / delete rows.
What are you trying to accomplish?
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Does the same SQL work correctly from the command line tool?
It is not very common to drop a table when data changes,
usually the schema is stable and rows are inserted into and
deleted from tables, or column values changed.
It might indicate a flaw in your
esn't tell anything about the average
percentage of payload in database pages, which would be
another reason to vacuum.
For a full analysis, you'd have to run the sqlite3_analyzer
program, or incorporate part of its code in your
application.
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e they getting slower the
>further I go? And why are the updates so slow?
>
>Is it because the database file is too big?
>
>Any help or suggestions would be highly appreciated!
>
>Regards,
>
>Flo
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a while, but if it's your personal system
it won't hurt anybody.
>Thanks!
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ed this, as now even the
>original system no longer shows this effect, but it's very probably
>not SQLite.
>
>Best regards,
>
>Günter
Ok, I'm glad it works for you.
Thanks for letting us know.
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t;
>sqlite3_exec(db, zSQL, 0, 0, 0);
>sqlite3_free(zSQL);
Two common optimizations:
1) Wrap the INSERT statements in a transaction
while not EOF on input file
BEGIN
loop 1 times or EOF
syntax
6MATCH reserved for user C function match()
6REGEXP reserved for user C function regexp()
7ANDboolean (logical) AND
8OR boolean (logical) OR
(Note to the SQLite developers: I could put this in the wiki
but it might be better to update the
http://www.sqlite.org/lang_expr.html#binaryops page itself)
> Again sorry for the post.
No problem.
>Dp.
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lve it in the host language, which is what I would
do. Actually, OP's original:
sqlite3 db 'select * from foo order by field desc; '|cat -n
is pretty good.
Oh, well, there are 11 roads to Rome :)
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On Fri, 27 Mar 2009 18:08:13 +0100, Kees Nuyt
<k.n...@zonnet.nl> wrote:
> PRIMARY KEY (filepathid,filename,istarget)
Oops, make that
PRIMARY KEY (pathid,filename,istarget)
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sql
e absolute path), but I guess you are aware of
that :)
>Can someone help me?
>
>Regards,
>Jonas
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On Wed, 25 Mar 2009 18:47:14 -0600, Dennis Cote
<r.dennis.c...@gmail.com> wrote:
>Kees Nuyt wrote:
>>
>> This seems a very nice addition to the
>> http://www.sqlite.org/cvstrac/wiki?p=SampleCode
>> we already have.
>>
>> I feel tempted to put it in th
d everyone who contributed to this great peace of
>software.
+1
>Thanks and best regards,
>
>Günter
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;
>
>
>
>
>___
>
>sqlite-users mailing list
>
>sqlite-users@sqlite.org
>
>http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
>___
/cvstrac/wiki?p=SampleCode
we already have.
I feel tempted to put it in the wiki
http://www.sqlite.org/cvstrac/wiki
under the 'Hints For Using SQLite More Effectively' heading,
as http://www.sqlite.org/cvstrac/wiki?p=SimpleCode.
Would you mind if I do?
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diskbuffers.
> I will try out with PostGres and report back on what I get.
I'm curious.
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6.11 and 3.6.12 (e.g. checkin 6341
http://www.sqlite.org/cvstrac/chngview?cn=6341 ).
The effect would be that often used pages (like non-leaf
index pages) are retained, which could reduce I/O.
>Also, you might consider going 64-bit.
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SD) I have
no idea what else can be done to improve performance.
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size I would start
with the maximum page_size allowed, that is 32768 bytes.
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gt;> Apart from the sqlite command line tool, I can recommend
>> the source of fossil, which does all its magic around a
>> SQLite database:
>> http://www.fossil-scm.org/index.html/doc/tip/www/index.wiki
>>
>> Also, there is some code in the SQLite wiki:
>> http://www
nfo on http://www.sqlite.org/ about
architecture and optimization.
> 3. Are there any ways to compress db files in disk (for
> free) and then is sqlite able to still get to the data
> easily?
Donald already gave a good answer to that question.
> Thank you!
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synchronous=off (only during loading)
By the way, INTEGER PRIMARY KEY is faster than a TEXT column
(VARCHAR is also TEXT) as primary key.
>thnx
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ite3 test_41.db3 .dump >t41
# diff t38 t41
>Thanks,
>Ev
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mary key on a text column) that
won't make a difference, I think.
>thank you
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;
Which when enabled allows you to UPDATE or
DELETE against the sqlite_master table.
==
Using this PRAGMA, you can UPDATE the sql column in the
sqlite_master table. Of course this is undocumented and
unsupported, and you risk corru
in mind all the comments about single quotes.
>
>A bit more information though. Is there a term for
>that type of SELECT statement?
See above.
>Thanx,
>Dp.
HTH
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'||
> CAST((intIP & 65280) >> 8 AS text)||'.'||
> CAST((intIP & 255) AS text) AS strIP
> FROM IP_table;
Cute code, thanks.
The implementation of BitAnd and ShiftRight in the
SQLite VM (~line 10176 in the amalgamated sqlite.c)
is very straightforward and should be pretty fast.
&g
y Shower|Carrot Cake
9|2|The Jacket|
10|2|The Chinese Restaurant|
11|2|The Phone Message|
12|2|The Apartment|
13|2|The Stranded|Cinnamon Bobka
14|2|The Statue|
#
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his for the Windows platform.
sqlite3.exe in a CMD window.
If I suspect the SQL is difficult enough to make typoos, I
write a script with an ascii editor.
sqlite3 test.db3 Thanks.
>
>Jonathan
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sq
3.6.11.
> Thank in advance,
> JP
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http://www.sqlite.org/lockingv3.html#how_to_corrupt
http://www.sqlite.org/cvstrac/wiki?p=DatabaseCorruption
http://www.sqlite.org/atomiccommit.html
>Thanks and regards
>
>Chaitali
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sqlite
) VALUES (2,"");
.quit
sqlite3 database1.sdb
attach database 'database2.sdb' as db2
select .
{{results}}
.quit
Hope this helps.
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mpleCode
>Thank you very much
>
>Michael
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OIN db2.TableTwo n ON n.MyID=d.MyID
WHERE d.Zip > 80000
ORDER BY d.Zip;
DETACH DATABASE db2;
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ww.sqlite.org/cvstrac/wiki?p=SqliteWikiFaq
>If not,
>are there any plans to add a "check" or "test" or "fulltest" target to
>the amalgamation source?
>
>Thanks,
>
>Tim
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to attach
> at least 30 db at once ?
It's in the documentation:
http://www.sqlite.org/lang_attach.html
>thanx!
>
>bax
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h
>kind of codes when using "sqlite3_prepare_v2() + sqlite3_step() +
>sqlite3_column_*()"?
Perhaps the sqlite3_get_table() API is what you are looking
for? http://www.sqlite.org/c3ref/free_table.html
>
>Kees Nuyt wrote:
>>
>> On Fri, 6 Mar 2009 02:15:10 -0800 (PST
t.c
>
>If somebody found it useful or good enough: Feel free to use it, change it,
>or put on wiki pages.
I added it to the Wiki :
http://www.sqlite.org/cvstrac/wiki?p=SampleCode
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s.
http://www.sqlite.org/lang_transaction.html
I hope this helps and I added it to the wiki FAQ:
http://www.sqlite.org/cvstrac/wiki?p=SqliteWikiFaq
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iety of clients and
>developers. Here are the top group of items I think you have missed:
[snip]
Excellent article!
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oogle.com/search?hl=en=SQL+join+"cheat+sheet"+sqlite
>Michael
>
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_
e functions to return any of a
few supported formats your application can cope with.
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cation do the formatting.
SQL isn't meant for presentation anyway, it's for relational
storage.
Example:
Compute the time since the unix epoch in seconds (like
strftime('%s','now') except this includes the fractional
part):
SELECT (julianday('now') - 2440587.5)*8640
On Sat, 28 Feb 2009 00:20:48 +0300, Alexey Pechnikov
<pechni...@mobigroup.ru> wrote:
>Hello!
>
>On Friday 27 February 2009 21:50:30 Kees Nuyt wrote:
>> A view or trigger in one database is not allowed to
>> reference tables (or other views) in other databases. T
I don't advise this, it's hard to maintain.
A loadable extension is the "proper mechanism".
>-Bryan
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>Thanks very much
>
>Michael R
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g more time on the
site ;)
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l
http://www.sqlite.org/cvstrac/wiki
>Thank you very much
>
>Michael R
HTH
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make it too big. 4096 or 8192 are a good start to
experiment with.
> Unless anyone has some good ideas I might
> have to give up on Sqlite.
I'm sure you can get more performance if you tweak page_size
and cache_size with some more understanding.
Use whatever engine is best for the tas
On Tue, 17 Feb 2009 19:11:56 +0100, Kees Nuyt
<k.n...@zonnet.nl> wrote in sqlite-users@sqlite.org:
I'm not fond of replying to myself, but this needs some
clarification:
>- Try to use integers as primary key,
> make it the first column, << wrong
> and use the exact
ma
- Do not define indexes that are seldomly used
- Try to use integers as primary key,
make it the first column,
and use the exact code
CREATE TABLE tablename (
columnname INTEGER PRIMARY KEY,
);
- Do not store data that you don't need
>Thanks in ad
is is slow, just curious.
The speed very much depends on what you do with the output.
If it scrolls over a terminal, the terminal will be the
bottleneck.
It should be very fast if you redirect the output to
/dev/null.
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) and sqlite3_finalize()?
Do you check the return code of sqlite3_close() ?
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be good enough.
Will you use FTS?
http://www.sqlite.org/cvstrac/wiki?p=FtsTwo
>Can any one help me with this. It would be really helpful to me.
>Thank You in Advance
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e_size.
For the :memory: database, you see the rows being stored in
memory and perhaps also some cache.
Obviously, both cases also use some memory to store the
datastructure that stores the interpreted schema and
housekeeping stuff.
>Thanks in advance,
>Jai
More detail can
be available in the command
line tool:
sqlite> .help
.backup ?DB? FILE Backup DB (default "main") to FILE
.restore ?DB? FILE Restore content of DB
(default "main") from FILE
http://www.sqlite.org/draft/sqlite.html
>D. Richard Hipp
>d...@hwaci.com
e
>
>Enter ".help" for instructions
>sqlite> .schema
>Error: file is encrypted or is not a database
>sqlite>
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On Mon, 26 Jan 2009 10:44:12 -0600, Nicolas Williams
<nicolas.willi...@sun.com> wrote in General Discussion of
SQLite Database <sqlite-users@sqlite.org>:
>On Sun, Jan 25, 2009 at 01:32:57PM +0100, Kees Nuyt wrote:
[...]
>> To get a % progress indicator you need a mor
ideas about this.
>
>RBS
If the security is important to you, it might be worth to
invest in SEE, the proprietary, licenced, SQLite Encryption
Extension:
http://www.sqlite.org/support.html
It makes sure only your application can access the database.
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t;
>Insert Statement (in TCL):
>
>switch -exact -- $Variable_Record_Type {
>
>HEADER { db1 eval "INSERT INTO HEADER($Variable_Column_Name) VALUES
>($Variable_Column_Value)"}
>TRAILER { db1 eval "INSERT INTO TRAILER($Variable_C
mns and a user is given the
>ability to design his own Querie that may include
>columns that are not indexed.
Exact progress indicators are hard. It's better to optimize
the schema and selects and not need progress indicators at
all. With proper design, 40k rows and no joins, most selects
is too much of an effort, and you have to use the
old database format, why not simply keep using the ancient
jdbc version that is able to access it?
>Best regards,
>Garp
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n happen, and your data is
important, it makes sense to include history tables in your
schema, and create an ON DELETE triggers to save deleted
rows to the history tables.
That way you even would be able to recover rows that have
been inserted and deleted after the most recent backup.
--
epare each time I want to run the query."
>
>
>
>
>Maybe you would be preparing hundreds or thousands of different queries
>per minute -- but if by chance you're not -- could anyone be expected to
>notice the time for the prepare's?
A
lain.html
http://www.sqlite.org/tempfiles.html
http://www.sqlite.org/atomiccommit.html
>Thanks.
Hope this helps.
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tware developers (e.g using it for the
> Firefox 3 bookmars engine)?
>
> I bought the book: "Sqlite: the definitive guide"
> (by M. Owens).
>
> The book is great but, in my opinion, there are very
> few examples. Of course it is impossible to write
/www.sqlite.org/lang_explain.html
Each JOIN is implemented as nested loops. The virtual
machine code can tell a lot about what part of the database
has to be scanned.
>I have other queries which worry me. But that trick did not help in
>these cases :-(
>
[...]
>
>Thank you a
, panel, output_data) VALUES ..;
will delete the original row and insert the new one.
None of the original columns values in the affected row will
survive.
>thanks,
>ed
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ll
;
; php_pdo_sqlite_external.dll loads
; a genuine sqlite3.dll
extension=php_pdo_sqlite_external.dll
>Thanks for help
>
>nobs
Hope this helps.
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e many other reasons.
>
> There is a lot of files. So, I don't know exactly
> why at this time, But thought network latency
> can´t be denied.
>
> /Edward
Which of my suggestions did you already try?
>On Wed, Jan 7, 2009 at 4:07 AM, Kees Nuyt <k.n...@zonnet.nl> wrote:
broker servers.
I'm afraid the chosen architecture isn't scalable, and code
tweaking in sqlite will not help much.
Opening and closing one of 20,000,000 files for every
logical transaction is not suitable for such a scale. An
operation of that size should be able to construct a better
so
each individual database's memory usage?
>
>I found the functions sqlite3_memory_used() and
>sqlite3_status(SQLITE_STATUS_MEMORY_USED, ...) but these look like they
>provide memory statistics for all of sqlite, not per database.
>
>thanks,
>ed
Hope this helps.
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);
INSERT INTO talks SELECT * FROM talks_with_dups;
>Craig Smith
>cr...@macscripter.net
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sq
e tabs\nselect * from DS0001 limit 1;" | sqlite3
NLSY.db
> THanks so much to a very helpful list!
> -W
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ation then.
Hopefully zeos implemented the sqlite3_interrupt() call.
http://www.sqlite.org/c3ref/interrupt.html
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