Hi all, I have a question about data type BIGINT: from docs
(http://www.sqlite.org/datatype3.html) I understand that INTEGER and
BIGINT results in the same affinity (INTEGER), so datatypes are same, is
it correct?
Unfortunately if I create a table with a field "Id BIGINT PRIMARY KEY
Ok understand thanks
Il 07/11/2014 14.40, Richard Hipp ha scritto:
On Fri, Nov 7, 2014 at 8:26 AM, Michele Pradella <michele.prade...@selea.com
wrote:
Is there a way to sue AUTOINCREMENT with BIGINT? what's the reason for
this check?
No. Furthermore, AUTOINCREMENT probably does not do w
INDEX uq_ColA_ColB ON table(ColA, ColB)
which one do you think is better in terms of performance? keep in mind
the table have millions of records and SELECT is the most frequent operation
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Compiling on Windows 32bit VS2010
Line 73595
static const int iLn = __LINE__+4;
give an error: "error C2099: initializer is not a constant"
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I have an In-Memory DB that is written and read from connections of the
same process. All good with shared cache, but I found that TableLock
occur more often on In-Memory than on disk DB, probably because in
memory we can't use WAL.
Anyway I found the PRAGMA read_uncommitted that from
Il 2016-04-23 11:05 R Smith ha scritto:
> On 2016/04/23 10:20 AM, Michele Pradella wrote:
>
>> I have an In-Memory DB that is written and read from connections of the
>> same process. All good with shared cache, but I found that TableLock
>> occur more often on I
Hi all, is there a way to make a benchmark of queries to check which
version is faster? I'm using sqlite shell, the question is about on how
to make repetitive tests in the same conditions (for example I need to
totally disable cache to avoid different results the second time query
is
(*field* LIKE 'EX011%') AND
(DateTime>=14550588) AND (DateTime<=14552315) ORDER BY
DateTime;
If I try to force the use of an index on *field *but I think sqlite
can't use it, is it right?
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
Italy - 46019 Cicognara (MN)
Tel +39 0375 889091
Fax +39 0375 889080
*michele.pradella at selea.com* <mailto:michele.pradella at selea.com>
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Il 12/02/2016 10.28, Michele Pradella ha scritto:
>
Ok understood...anyway trying with sqlite shell it's seams that (filed
LIKE 'AA%') is slower than (field>='AAA' AND field<='AAZ')
do you think there's a way I can check if the optimization is working?
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
Moreover if I make field LIKE 'AA%' and I use INDEXED BY index_on_field
shell return me "Error: no query solution"
so it's seams sqlite with LIKE operator can't use index on field
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
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th explain query plan the index on field is not used.
Do you think I'm doing something wrong?
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Michele Pradella R
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Via Aldo Moro 69
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Tel +39 0375 889091
Fax +39 0375 889080
*michele.pradella at selea.com* <mailto:mic
(Plate LIKE 'EX011%'))
SELECT
DateTime,FileName,Plate,Type,CameraName,Id,Country,Reason,CarPlateType,VehicleType,GPS
FROM car_plates INDEXED BY car_plates_plate WHERE ((Plate LIKE 'EX011%'))
give me error
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
Italy -
with a earlier sqlite version and I
do not know if this can cause the use of wrong index.
So speaking about performance, which is better PRAGMA case_sensitive_like=ON;
or PRAGMA case_sensitive_like=OFF;?
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
Italy - 46019
teTime>? AND DateTimemailto:michele.pradella at selea.com>
*http://www.selea.com*
Il 12/02/2016 13.44, Michele Pradella ha scritto:
> ok, assume casr_sensitive_like=OFF (default), according the point 6 of
> LIKE optimization:
> http://www.sqlite.org/optoverview.html
> should be t
Y PLAN SELECT * FROM car_plates indexed by
car_plates_plateWHERE ((Plate LIKE 'EX011%')) AND
(DateTime>=14550588)AND(DateTime<=14552315)
with PRAGMA case_sensitive_like=OFF; you obviously obtain error
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via
f I remove the second expression ((CarPlateType==-1)AND((Plate LIKE
'~A00O%'))) it works
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Michele Pradella R
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*michele.pradella at selea.com* <mailto:michele.pradella
Splitting query in 2 SELECT using UNION let me use car_plates_plate
index without problemvery strange...but I found a walkaround
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
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Tel +39 0375 889091
Fax +39 0375 889080
Already solved with UNION of SELECT
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
Italy - 46019 Cicognara (MN)
Tel +39 0375 889091
Fax +39 0375 889080
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Il 12/0
for the column and the default car_sensitive_like you will get always
the slowest result in LIKE queries
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Michele Pradella R
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Via Aldo Moro 69
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Fax +39 0375 889080
*michele.pradella at selea.com
it...
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Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
Italy - 46019 Cicognara (MN)
Tel +39 0375 889091
Fax +39 0375 889080
*michele.pradella at selea.com* <mailto:michele.pradella at selea.com>
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Il 15/02/2016 10.51, Simon Slavin ha s
Anyway thank you Simon the point of view it's clear now
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*michele.pradella at selea.com* <mailto:michele.pradella at selea.com>
Hi all, I have a question about using index with multiple column.
Take this test case
CREATE TABLE test (DateTime BIGINT,CarPlate VARCHAR(255));
CREATE INDEX indexA ON test(DateTime);
CREATE INDEX indexB ON test(CarPlate);
CREATE INDEX indexAB ON test(DateTime,CarPlate);
now if you do
[1] ->
Ok understand, so there's no way to use that kind of double column index
on a select like
explain query plan select * from test where (CarPlate LIKE 'AA000%') AND
(DateTime>1);
because at least one field have to do with operator = correct?
Selea s.r.l.
Michele Pradell
because at least one field have to do with operator = correct?
no can be one of = or IN or IS but not LIKE operator
Selea s.r.l.
Michele Pradella R
SELEA s.r.l.
Via Aldo Moro 69
Italy - 46019 Cicognara (MN)
Tel +39 0375 889091
Fax +39 0375 889080
*michele.pradella
> (please don't top-post)
>
> Michele Pradella wrote:
>> so there's no way to use that kind of double column index on a select like
>> explain query plan select * from test where (CarPlate LIKE 'AA000%') AND
>> (DateTime>1);
>> because at least one fiel
; that query have to
do if we use indexAB instead index?
>
>> -Original Message-
>> From: sqlite-users-bounces at mailinglists.sqlite.org [mailto:sqlite-users-
>> bounces at mailinglists.sqlite.org] On Behalf Of Michele Pradella
>> Sent: Friday, 19 February, 2016 01:07
>>> Your indexes are badly designed.
>>>
>>> You require the following two indexes:
>>> CREATE INDEX indexAB ON test(DateTime,CarPlate);
>>> CREATE INDEX indexBA ON test(CarPlate,DateTime);
>>>
>>> The indexes:
CREATE INDEX indexA ON test(DateTime);
CREATE INDEX indexB ON test(CarPlate);
> On 22 Feb 2016, at 9:07am, Michele Pradella
> wrote:
>
>> Already done this check. My last question was about to reduce the number of
>> indexes on table avoiding kill a "quite unnecessary" index that if used do a
>> better job that the other.
>>
I check the default cache_size of a In-Memory DB and it's 2000
Do you think for that kind of DB I can put cache_size to 0 like default
for TEMP DB? or you think it's better leave 2000?
Just wandering if it's correct to have ram cache of a In-Memory DB
Which is the best way to estimate the size of an In-Memory DB?
Now I'm using (PRAGMA page_size)*(PRAGMA page_count) to have an idea of
the size in RAM of the db. It's quite ok but obviously it gives a value
less than the real (probably because indexes and other stuff are missing
from cont)
For
Il 2016-03-18 17:18 Richard Hipp ha scritto:
> On 3/18/16, Michele Pradella wrote:
>
>> Which is the best way to estimate the size of an In-Memory DB?
>> Now I'm using (PRAGMA page_size)*(PRAGMA page_count) to have an idea of
>> the size in RAM of the db. It's quite o
> I need to have a CEIL function in SQLite. This is the way I implemented it:
> WITH percentage AS (
> SELECT date
> , 100.0 * rank / outOf AS percentage
> , CAST(100.0 * rank / outOf AS int) AS castedPercentage
> FROM ranking
> )
> SELECT date
> ,
> 2016-05-09 13:40 GMT+02:00 Michele Pradella :
>
>> I need to have a CEIL function in SQLite. This is the way I implemented it:
>>> WITH percentage AS (
>>> SELECT date
>>> , 100.0 * rank / outOf AS percentage
>>&g
Hi,
I found a strange behavior of the sqlite 3.7.2 with WAL journal mode.
Yesterday I found my application DB with a -wal file of 1,5GB and a -shm
file of few MB (about 9MB) with a DB file of 1,2GB: in this
situation I got the process memory wasted by "mapped file" of the -shm
file. It seams
/2010 14.43, Richard Hipp ha scritto:
> On Thu, Sep 2, 2010 at 8:34 AM, Michele Pradella<michele.prade...@selea.com
>> wrote:
>> Hi,
>> I found a strange behavior of the sqlite 3.7.2 with WAL journal mode.
>> Yesterday I found my application DB with a -wal file of 1,5G
ine.de>wrote:
>
>> Michele Pradella wrote:
>>>ok, I'll wait for the walk around.
>>> I always use a BEGIN; COMMIT; transaction but often, after a COMMIT; the
>>> -wal file does not change in size, it seams it's not checkponted.
>>> Anyway do you thi
ok thank you, today I'm going to port the difference to my source code
and I'm going to try if the memory it's ok
Il 09/09/2010 9.37, Dan Kennedy ha scritto:
> On Sep 9, 2010, at 1:12 PM, Michele Pradella wrote:
>
>> Hi, do you have some news about the wasted memory? ha
think I ported the fix in the right way, and the problem still exist.
I'll do some other tests.
After this fix did you never see the problem?
Il 09/09/2010 9.46, Michele Pradella ha scritto:
>ok thank you, today I'm going to port the difference to my source code
> and I'm going
).
ps.With this DB the "SELECT count(ID) FROM table_name" it's very
slow...it take minutes(with the sqlite shell)!
Il 09/09/2010 17.04, Max Vlasov ha scritto:
> On Thu, Sep 9, 2010 at 11:37 AM, Dan Kennedy<danielk1...@gmail.com> wrote:
>
>> On Sep 9, 2010, at 1:1
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>
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Tel +39 037
g? Can you
> provide a short series of statements with the CLI to reproduce this?
>
> HTH.
> -Shane
>
>
>
>
> On Thu, Sep 9, 2010 at 11:36 AM, Michele Pradella
> <michele.prade...@selea.com> wrote:
>> Hi Max, I got the problem in both situations:
)).
>
> There's a change that there's something wrong with my program, can someone
> do a similar test on another Windows 64bit system?
>
> Thanks
>
> Max
> _______
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> sqlite-users@sqlite.org
> http://
e.
Il 10/09/2010 8.27, Michele Pradella ha scritto:
>Even in my use case I got "Disk I/O error" after I reached 2GB of
> virtual memory.
> Max tell us the size of the memory mapped file in VMMap tool when you
> got "Disk I/O error", and check the value of Virtual B
; address
>> space for superset/subset regions in contrary to Windows logic?
> It is separate. This bug was in the OS specific win32 layer
>
> Dan.
>
>
>
>
>
> ___
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> sqlite-users@sq
modified os_win.c from the full package into 3_7_2
> amalgamation.
>
> Max
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till tomorrow, so I can tell you
more about this situation.
Il 10/09/2010 12.16, Michele Pradella ha scritto:
>ok, Dan already sent me a sqlite3.c source, and I'm doing some
> tests...I let you know the results
>
> Il 10/09/2010 12.12, Max Vlasov ha scritto:
>> On Fri, Sep 10
by WAL mechanism?
Il 10/09/2010 14.51, Max Vlasov ha scritto:
> On Fri, Sep 10, 2010 at 3:52 PM, Michele Pradella<
> michele.prade...@selea.com> wrote:
>
>> After some tests, with the new sqlite3.c source, seams that the
>> behavior is better than before. So I see the
the DB connection? is just a question, and anyway
I got my application running to test this behavior.
Il 10/09/2010 15.20, Max Vlasov ha scritto:
> On Fri, Sep 10, 2010 at 5:07 PM, Michele Pradella<
> michele.prade...@selea.com> wrote:
>
>> what I worry about is tha
ith the patched library.2,000,000 appends were made without any
> problem.
>
>
> On Fri, Sep 10, 2010 at 5:37 PM, Michele Pradella<
> michele.prade...@selea.com> wrote:
>
>> ...connection do the operation that in my situation cause the -shm Mapped
>> File grow up,
will be released?
Il 13/09/2010 8.18, Michele Pradella ha scritto:
>Ok I think that the latest patch I used to try the WAL is the patch
> that fix the problem. I do not get wasted memory by mapped file ;) good
> job. Anyway I leave the application running this day. If I have news
> I'll tell
ok, I think I'll use the snapshot in the mean time. Thank you
Il 16/09/2010 15.43, Richard Hipp ha scritto:
> On Thu, Sep 16, 2010 at 9:02 AM, Michele Pradella<
> michele.prade...@selea.com> wrote:
>
>> After some days of test the application work fine and with VMMap
urf& Phone Flat 16.000 für
>> nur 19,99/mtl.!* http://produkte.web.de/go/DSL_Doppel_Flatrate/2
>> ___
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>> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
>>
>
ok thank you, usually how big is the default page_size?
Il 22/09/2010 16.17, Jay A. Kreibich ha scritto:
> On Wed, Sep 22, 2010 at 12:02:33PM +0200, Michele Pradella scratched on the
> wall:
>>I have a question about "PRAGMA cache_size"
>> if I use the d
ok I think the default is 1024.
So for 2000 of cache size:
(100+1024)*2000=2,2MB
Il 22/09/2010 16.30, Michele Pradella ha scritto:
>ok thank you, usually how big is the default page_size?
>
> Il 22/09/2010 16.17, Jay A. Kreibich ha scritto:
>> On Wed, Sep 22, 2010 at 1
_
> sqlite-users mailing list
> sqlite-users@sqlite.org
> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
>
>
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SELEA s.r.l.
Via Aldo Moro 69
Italy - 46019 Cicognara (MN)
Tel +39 0375 889091
Fax +39 0375 889080
I have an SQLite DB of about 9GB with about 2.500.000 records.
I can't understand why the "select COUNT(*) from log" statement is
extremely slow, it takes me about 9-10 minutes!
I try with:
select COUNT(1) from logs
select COUNT(DateTime) from logs
same result. Have you idea of why it's so
g10279.html
>
> If you need the result quickly, you have to maintain the rnumber of
> records yourself in a different table, perhaps using triggers.
>
> Martin
>
>
> Am 24.09.2010 10:13, schrieb Michele Pradella:
>> I have an SQLite DB of about 9GB with about 2.500
I can get a big speed up of COUNT if I first do a VIEW of what I have
to count and than make select COUNT on the view.
Without VIEW: 9 Minutes
With VIEW: 8 Seconds!
Il 24/09/2010 10.58, Martin Engelschalk ha scritto:
>
> Am 24.09.2010 10:38, schrieb Michele Pradella:
>> o
That's why the =1 mode is called "serial"...
>it automatically serializes the database statements.
>
>At least, I'm pretty sure that's how it works. I generally avoid
> threaded code, and when I do use it, I tend to use thread-specific
>resources that are carefully
I check in the sqlite3.c code for the SQLITE_THREADSAFE. I can't found
any difference between SQLITE_THREADSAFE=1 and SQLITE_THREADSAFE=2. I
found only differences if SQLITE_THREADSAFE=0 or SQLITE_THREADSAFE>0
Have I miss something?
Il 06/10/2010 8.07, Michele Pradella ha scritto:
>
Hi all, I have a question about how to speed up a DELETE statement.
I have a DB of about 3GB: the DB has about 23 millions of records.
The DB is indexed by a DateTime column (is a 64 bit integer), and
suppose you want to delete all records before a date.
Now I'm using a syntax like this (I try
t 7, 2010 at 11:05 AM, Michele Pradella
> <michele.prade...@selea.com> wrote:
>> Hi all, I have a question about how to speed up a DELETE statement.
>> I have a DB of about 3GB: the DB has about 23 millions of records.
>> The DB is indexed by a DateTime column (is a 64 bi
ame, after closing shell the -wal remain.
Moreover the operation above "create new" terminate with a "Error:
disk I/O error"
The hard disk I use has a lot of free space and it's SATA2 hard disk, so
is internal
Il 07/10/2010 20.38, Petite Abeille ha scritto:
> On Oct 7, 2
I was thinking this too, but I take this for last chance: my hope is I
can delete 5 millions of records in few seconds, science fiction? :)
Il 08/10/2010 9.00, Aldes Rossi ha scritto:
>Il 10/08/2010 08:30 AM, Michele Pradella ha scritto:
>> I don't know if could be faster to do mo
I'll try to increase cache size, and I'll try operation on my Db with
the 3.7.3 anyway I already ported the Fix of the WAL issue from recent
snapshot. I'll try and let you know
Il 08/10/2010 9.52, Marcus Grimm ha scritto:
> Michele Pradella wrote:
>>As I explain in previews email
with .quit the -wal file is
reintegrated.
I thought that Ctrl+C is like a ".quit " but it's not.
Anyway if I close the DB connection with Ctrl+C and than reopen
connection and close it with .quit the -wal file is not reintegrated.
Il 08/10/2010 9.56, Michele Pradella ha scritto:
>
DELETE on PrimaryKey instead of DateTime index takes same time
Il 08/10/2010 10.30, Michele Pradella ha scritto:
>ok I'll try with 3.7.3
> DELETE is a little bit faster, and the -wal is reintegrated when I close
> the connection.
> Changing cache_size (I try 1) DELETE tak
> Anyway if I close the DB connection with Ctrl+C and than reopen
>> connection and close it with .quit the -wal file is not reintegrated.
>>
>> Il 08/10/2010 9.56, Michele Pradella ha scritto:
>>> I'll try to increase cache size, and I'll try operation on my Db with
>>
the time used. It's the only way I can figure out at the moment.
Il 08/10/2010 15.55, Jay A. Kreibich ha scritto:
> On Fri, Oct 08, 2010 at 09:09:09AM +0200, Michele Pradella scratched on the
> wall:
>>I was thinking this too, but I take this for last chance: my hope is I
&g
frequently less records.
If someone have a smart idea, I'm listening ;)
Il 08/10/2010 22.54, Nicolas Williams ha scritto:
> On Fri, Oct 08, 2010 at 05:49:18PM +0100, Simon Slavin wrote:
>> On 8 Oct 2010, at 5:48pm, Stephan Wehner wrote:
>>> On Fri, Oct 8, 2010 at 7:14 AM, Michele
down all the other DB
operation.
Il 11/10/2010 11.46, Simon Slavin ha scritto:
> On 11 Oct 2010, at 10:26am, Michele Pradella wrote:
>
>> Soft delete could increase the SELECT speed because you have to check
>> always for the "deleted" column.
>> Moreover
It's what I'm doing: I'm deleting every 15 minutes of a small number
of records at a time.
Il 11/10/2010 12.40, Simon Slavin ha scritto:
> On 11 Oct 2010, at 10:56am, Michele Pradella wrote:
>
>> I know that in this use case UPDATE is lither than DELETE, but if I
>> make
> So each delete would be approx 100 times faster and would allow interruption
> inbetween deletes.
>
>
>
> Michael D. Black
> Senior Scientist
> Advanced Analytics Directorate
> Northrop Grumman Information Systems
>
>
>
>
> F
reibich<j...@kreibi.ch> wrote:
>> On Mon, Oct 11, 2010 at 02:08:54PM +0200, Michele Pradella scratched on the
>> wall:
>>>Ok so the main idea it's always the same: split the DELETE to make the
>>> operation on less records, but do it more often.
>> Ano
Hi all, I have to INSERT a row in a DB but I have first to check if the
Key I'm inserting already exist.
Now I'm doing a "SELECT count..." first to check if the key exist and
then INSERT or UPDATE records.
Do you know if there's a better or faster way to do that?
Perhaps with an ON CONFLICT
say m...@t-online.de ?
>
> the - is an exclusion
>
> Thanks in advance!
>
> Ady
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example case, the second,
> which have the text "main".
>
> Is that possible? Maybe adding an UDF?
>
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Tel +39 0375 889091
F
possible to set up a maximum amount of memory that the library can use?
--
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Via Aldo Moro 69
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Tel +39 0375 889091
Fax +39 0375 889080
*michele.prade...@selea.com* <mailto:michele.prade...@selea.com>
s.html
> and
> http://www.sqlite.org/c3ref/c_status_malloc_count.html
>
> --
> Marco Bambini
> http://www.sqlabs.com
>
>
>
>
>
>
> On Feb 25, 2011, at 2:17 PM, Michele Pradella wrote:
>
>> Do you know if is there a way to ask to the sqlite library the am
Hi all, I read documentation about using sqlite on a Network file
system, so I know is not a good environment because file lock problem.
Anyway do you think I can have the same problem if I'm sure that only my
precess try write or read database? So I have just one process using
network DB (for
Il 05/08/2016 09.47, Simon Slavin ha scritto:
On 5 Aug 2016, at 7:30am, Michele Pradella <michele.prade...@selea.com> wrote:
Hi all, I read documentation about using sqlite on a Network file system, so I
know is not a good environment because file lock problem. Anyway do you think I
ca
-Original Message-
>> From: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org]
>> On Behalf Of Michele Pradella
>> Sent: Friday, 5 August, 2016 00:31
>> To: sqlite-users@mailinglists.sqlite.org
>> Subject: [sqlite] Network file system
>>
>
Hi all, I have a question about transactions and SQLite:
Do you think transactions are useful only when you have to do a sequence
of statements that depends on each other and you need a way to rollback
all statements if something goes wrong? or you can use transactions even
with not
t;> -Original Message-
>> From: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org]
>> On Behalf Of Michele Pradella
>> Sent: Friday, 5 August, 2016 00:31
>> To: sqlite-users@mailinglists.sqlite.org
>> Subject: [sqlite] Network file system
>>
Select DISTINCT name,id,status from names where status = 1
*Michele Pradella*
/R Software Engineer
/ michele.prade...@selea.com <mailto:michele.prade...@selea.com>
Office: +39 0375
Hi all, I was looking to the sqlite3_interrupt to make my application
closing faster without waiting for long standing DB operation. I read in
the documentation that should not be a problem to call it during insert
update or delete: if transaction is running is automatically rolled
back.
Do you
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