AFAIK, before deleting journal file SQLite writes some zeroed header
into it. This kind of header means that transaction is finished. And
even if after power shutdown SQLite finds this journal persisting on
disk it will see the header and will understand that this journal just
needs to be deleted.
Just a quick note though, when I move the .exe file to the desktop and
double-click on it, it crashes, which suggests that the bin/debug location is
only applicable when the application is run from within the IDE.
Crash is probably because your desktop folder doesn't have db
subdirectory
The stack trace you've shown is a lock for allocating new page in page
cache. It's probably the lock that helps SQLite ensure that total amount of
consumed memory is not greater than the limit configured. But if you work
only with in-memory databases then that check is moot and with next step
If opening a DB read-only implies that the physical file is always opened
read-only, then I understand. But, if read-only is just something for SQLite
to know that it can't modify the database, rollback would still be possible.
You are right that opening database with SQLITE_OPEN_READONLY
When you use SQLITE_CONFIG_MULTITHREAD you can't use the same handle
in different threads without some sort of synchronization. With
SQLITE_CONFIG_SERIALIZED you can do that because SQLite will do
synchronization for you. So there's no difference in concurrency here.
If you use different handles
select typeof(max(id)) from categories -- returns 'null'
select case max(id) when null then 1 end as NextID from categories
Matching with null does not work the same as matching with other values.
null means I don't know. so every value matches with it.
Just the opposite - every value
For example,
if the writer thread starts a transaction, and one of the reader threads
does a SELECT,
would the SELECT be part of the transaction? Or are transactions per-thread
on a shared connection?
All transactions are per-connection. So yes, SELECT will be a part of
transaction and you
the readers share a connection.
So the next question is, if a reader is in the middle of an exec
and has not finalized its statement yet, how would it affect
another thread that attempts a statement?
Thanks!
--erik
On Wed, Jan 25, 2012 at 10:34 AM, Pavel Ivanov paiva...@gmail.com wrote
Im observing that, if for example an SQL command in a transaction is
uncorrect, the rollback does not work: the previously inserted records are
not removed.
If you are trying to execute an incorrect SQL statement this statement
is not executed but transaction is not rolled back automatically.
Unfortunately, the string concatenation operator, when applied
to two BLOB's, results in a text string instead of a BLOB, like:
SELECT quote (X'5445' || X'5354');
= 'TEST'
Maybe the following?
SELECT quote(cast(X'5445' || X'5354' as blob));
Pavel
On Fri, Jan 20, 2012 at
and
wasn't changed for a long time. But keep that in mind just in case.
Pavel
On Fri, Jan 20, 2012 at 12:20 PM, Ivan Shmakov oneing...@gmail.com wrote:
Pavel Ivanov writes:
[...]
Unfortunately, the string concatenation operator, when applied to
two BLOB's, results in a text string
I attempted all of the above and the call stacks do not change. That leads
me to one of two conclusions:
1. The call stacks are inaccurate
2. There is some side effect which is causing malloc to be called inside
of a procedure which should not be calling malloc.
I've posted an update to
At this point I've exhausted my avenues of research. Does anyone have any
further ideas as to what may be going on which could cause this increase in
memory management activity? Or any suggestions of where to look next?
IIRC, SQLite 3.7.9 changed its PCACHE interface and thus page cache
how to suppress this messages? I cant find any kind of --quite or --silent
option.
You can redirect stderr to /dev/null and you won't see any error
messages then. Also you can redirect it to some file and analyze it
later for some kinds of errors you want to process.
Pavel
On Wed, Jan 11,
Is there a way to use spaces in named parameters?
No. Quick fix would be to replace all your spaces with underscores.
Pavel
On Tue, Jan 10, 2012 at 5:31 PM, Steven Michalske smichal...@gmail.com wrote:
Hello,
I would like to use the :nnn named parameters but have spaces in the
named
This sucession of queries give me SQLite error no such column:
tmp_ProporcionesGrupos.GRUPO
UPDATE ResRdosGrupo SET
ResRdosGrupo.PROPORCION =
( SELECT
tmp_ProporcionesGrupos.PROPORCION
FROM tmp_ProporcionesGrupos
)
WHERE
ResRdosGrupo.GRUPO = tmp_ProporcionesGrupos.GRUPO AND
On Wed, Dec 28, 2011 at 3:28 PM, Pete p...@mollysrevenge.com wrote:
If I create an index for a column in a table with existing data in it, is
the index automatically populated or do I have to use the REINDEX command?
Thanks,
It's automatically populated.
Pavel
INSERT INTO ids SELECT id FROM tableA, tableB WHERE pos BETWEEN start AND
end;
Try using a JOIN instead. In fact, try both ways around:
DELETE FROM ids;
INSERT INTO ids SELECT tableA.id FROM tableA JOIN tableB ON pos BETWEEN start
AND end;
then try
DELETE FROM ids;
INSERT INTO ids
Devil is in the details. What you described in general is okay. But I
guess the exact code you have has some problems. To find them we
should see the code.
An just some first check: do you have a single-threaded application
accessing database?
Pavel
On Fri, Dec 23, 2011 at 3:32 AM, Sreekumar
On Fri, Dec 23, 2011 at 9:06 AM, Sreekumar TP sreekumar...@gmail.com wrote:
Hi,
yes, I know. I have a multithreaded app. One db conection.I will try to
reproduce the problem with a simple app.
However, the difference between the working and non working case is that in
the working case
On Wed, Dec 21, 2011 at 10:41 AM, Jacob A. Camp
jacob.c...@mastercam.com wrote:
I have a line of code that executes that line:
const unsigned char * temp2 = sqlite3_column_text(state, 0);
This queries the database and after the call is complete I pass this value to
another function. This
Now, this is a very good test case and explanation what happens, except...
How did you check value of CString testing after iterating though the
entire char array? Did you look at it in your debugger? Maybe your
debugger is not capable of showing CString contents longer than 2048
symbols? The
5. Enter the following in session 2 (demonstrates unexpected behavior):
.timeout 1
begin;
select * from my_table;
update my_table set userid=1;
- A 'database locked' error message is returned immediately.
rollback;
Is this the expected behavior in
On Thu, Dec 15, 2011 at 10:05 AM, Paxdo Presse pa...@mac.com wrote:
It's normal not to get an error message
when trying to remove or edit a record that has already been removed?
Yes, it's normal. That's how SQL (in any DBMS, not only SQLite) works.
Pavel
so, I can see the journal file in my work directory which I own (and
in which the db file is placed).
still constantly, I have a disk I/O ERROR which I don't understand.
If you see journal file along your database file and each attempt to
open database doesn't delete journal file it means you
I have been analyzing the Query PLAN. In the query Select * FROM
WordGroupView Where idWordGroup = 1; the database engine perform a scan
over WordGroup table, and it is not necessary since the where clause is
defined. However, using directly the query of the view change the SCAN by a
SEARCH,
Regards,
Manuel Jesús.
El 02/12/2011 15:49, Pavel Ivanov escribió:
I have been analyzing the Query PLAN. In the query Select * FROM
WordGroupView Where idWordGroup = 1; the database engine perform a scan
over WordGroup table, and it is not necessary since the where clause is
defined. However
This will be fixed in next version. See
http://www.sqlite.org/src/info/5dbfaed8c3.
Pavel
On Wed, Nov 30, 2011 at 6:29 AM, Adolfo Jiménez Millán a...@zator.com wrote:
Hi all:
Using MS VC++ 98, I try to compile the 3.7.9 amalgamation, using the
SQLITE_OMIT_WAL directive, but then I get an
I do have multiple insertions bounded by BEGIN-COMMIT . I am looking at
possibilities of making the insertions faster.
Prepare your statement in the form
INSERT INTO table_name (val1, val2, ...) VALUES (?1, ?2, ...)
Then for each row you want to insert you will bind necessary values,
execute
On Tue, Nov 29, 2011 at 2:56 PM, Black, Michael (IS)
michael.bla...@ngc.com wrote:
In your words:
1. start cmd.exe
2. go to directory with sqlite3.exe
3. type test.sql | sqlite3 test.db3 (Return)
Don't get confused: you should type the word type here. ;)
Pavel
The thing is, it seems this readers don't ever see any changes in
the db unless i shut them down and run them again.
But connecting with the sqlite3 shell shows the changes in the db as
they happen.
The above two facts suggest that your readers do not close their
reading transactions
While((result = sqlite3_step(stmt)) == SQLITE_BUSY)
{
Usleep(_random [0s, 1s[_);
}
When sqlite3_step returned SQLITE_BUSY you have to call sqlite3_reset
before calling sqlite3_step again. So your loop should look like this:
While((result = sqlite3_step(stmt)) == SQLITE_BUSY)
On Sat, Nov 26, 2011 at 9:03 AM, Simon Slavin slav...@bigfraud.org wrote:
On 26 Nov 2011, at 2:00pm, Pavel Ivanov wrote:
When sqlite3_step returned SQLITE_BUSY you have to call sqlite3_reset
before calling sqlite3_step again.
If your statement is a SELECT returning 50 rows, and you've
P.S: I know that one can simply do a CREATE TABLE IF NOT EXISTS... but I
still need to know if a table exists or not.
You can easily try this with the sqlite3 command line tool by omitting
the database file name argument on the command line.
Create a table, insert a row, check sqlite_master.
On Wed, Nov 23, 2011 at 2:10 AM, Gaurav Vyas gav...@gmail.com wrote:
There is no optimization as of now. I am just slitting the code into
various independent parts. And one more thing I found, I have installed
SQLite3 3.7.9 and when I am using sqlite3_open_v2 it gives error that says
undefined
On Wed, Nov 23, 2011 at 11:28 AM, Simon Slavin slav...@bigfraud.org wrote:
On 23 Nov 2011, at 4:17pm, Wiktor Adamski wrote:
sqlite select 1 from t order by avg(a); -- should be possible
Why should this be possible ? For an 'ORDER BY' you need a value for each
row. But aggregate functions
On Wed, Nov 23, 2011 at 11:50 AM, Petite Abeille
petite.abei...@gmail.com wrote:
On Nov 23, 2011, at 5:35 PM, Pavel Ivanov wrote:
But although it's completely senseless
just syntactically it looks correct - should produce just one row and
thus ORDER BY will be a no-op.
Well
On Wed, Nov 23, 2011 at 12:20 PM, Petite Abeille
petite.abei...@gmail.com wrote:
On Nov 23, 2011, at 6:05 PM, Pavel Ivanov wrote:
This query gives
different and kind of unexpected result on empty table. ;)
Ooops... I see what you mean... on an empty table... this returns one row
On Wed, Nov 23, 2011 at 1:29 PM, Wiktor Adamski
bardzotajneko...@interia.pl wrote:
Apparently, using such a function in ORDER BY
clause alone doesn't make the statement aggregate (whether it should is
perhaps debatable)
I suppose this may be in the standart. I'm 100% sure that this one is
I insert data in this way (for example):
INSERT INTO [filed1] VALUES TIME('29-01-2011 08:00:00')
Result of TIME('29-01-2011 08:00:00') is NULL. So your field1 doesn't
contain anything. Maybe that's why your comparison doesn't work.
Pavel
On Tue, Nov 22, 2011 at 11:57 AM, Steffen Mangold
How come my sqlite can't recognize this statement? It's not showing as
completed and I don't see why.
Maybe there should be semicolon after update statement (i.e. after END
belonging to CASE)?
Pavel
On Tue, Nov 22, 2011 at 3:50 PM, Black, Michael (IS)
michael.bla...@ngc.com wrote:
How
DELETE statement doesn't support ORDER BY clause and by default
doesn't support LIMIT clause. So you should do the select, find the
value of prty for the second row and then issue a delete adding to its
WHERE clause and prty ? where you will bind that value of prty you
found.
Pavel
On Mon, Nov
// first we need to set the file class for our database (ICM.db).
var db:File = new File (C:/ICM.db);
Depending on your Windows version only users with elevated privileges
could be able to write into root C:\ directory. Adobe Air apparently
won't ask you to elevate its privileges just to
This kind of questions should be asked on sqlite-users mailing list.
Pavel
On Tue, Nov 15, 2011 at 3:19 AM, Ilber Ibrahimi iibrah...@solgenia.com wrote:
Hi u all,
I’m new to sqlite and i want to know how can i build sqlite with the
parameter SQLITE_ENABLE_COLUMN_METADATA enabled. I’m
select count(status) from mytable where status=0;
select count(status) from mytable where status=0 limit 1;
These two are identical because query always return one row thus
making limit 1 a no-op.
select status from mytable where status=0 limit 1;
This one will have the best performance
On Fri, Nov 11, 2011 at 11:58 AM, Petite Abeille
petite.abei...@gmail.com wrote:
It returns the same results, but it doesn't seem much faster. Is there any
performance difference to be expected from using IN instead of JOIN, or
does SQLite internally rewrite JOIN queries to something similar as
On Fri, Nov 11, 2011 at 8:06 PM, Petite Abeille
petite.abei...@gmail.com wrote:
No, exists in this case will change query plan significantly and
performance can degrade drastically as a result.
Why would that be?
How would you rewrite the query using exists? The only thing I have in mind is
I know this could be done more easily, but I have to keep this
structure (i.e. cannot JOIN for instance). My question is, how could I
avoid repeating the subqueries after the AND NOT, since they will
return the same set as the previous ones?
With your restriction on query structure you cannot
On Wed, Nov 9, 2011 at 10:31 AM, hmas i...@iode-informatique.fr wrote:
Thanks for your answer.
foocol contains a string of numbers.
The result of typeof(foocol) is text.
And what's the result of hex(foocol) ? My guess is you have some extra
non-printable characters in there.
Hi,
Here are
But I'm wondering if SQLite can deal more efficiently with a INTEGER index
(64bits) VS an 8-byte TEXT column (also 64bits). I know the INTEGERs
require less disk-space because SQLite can store smaller values in fewer
bytes, but are there any other differences that make them more preferable
as
Thanks for your answer.
foocol contains a string of numbers.
The result of typeof(foocol) is text.
And what's the result of hex(foocol) ? My guess is you have some extra
non-printable characters in there.
Pavel
On Tue, Nov 8, 2011 at 12:11 PM, hmas i...@iode-informatique.fr wrote:
Simon
On Mon, Nov 7, 2011 at 5:48 PM, Jean-Christophe Deschamps
j...@antichoc.net wrote:
Pavel,
This is not a local file. Even if you use your hostname as netname
file is still retrieved through network stack. And I guess SAMBA
doesn't work well with memory mapped files (in addition to all
Does your path begin with 'file:' ?
No, simply
\\netname\share\path\test.db
This is not a local file. Even if you use your hostname as netname
file is still retrieved through network stack. And I guess SAMBA
doesn't work well with memory mapped files (in addition to all
problems with
What is the page size? Aren't sqlite dbs portable to any
platform/processor? Could it be that sqlite installed on my 64-bit machine is
writing a 64-bit db, but our app and the sqlite3 lib is only 32-bit? Seems
like any good file format wouldn't care about that and knows how to
read/write
err = sqlite3_prepare16_v2(m_dbh, stmt.m_sql.c_str(), -1, stmt.m_stmt, NULL);
err - SQLITE_ERROR
If I manually set the string to PRAGMA page_size = 4096, then it works. So
perhaps this code is doing it wrong. I copied an existing routine that
somebody else no longer with the company wrote.
What I ultimately want to do is iterate through a table that contains the
limit and use that value to select all matching values from another table,
limiting the number of records selected from the group to that defined by
limit.
There's no way to do such thing using only SQL. You have to
I'm assuming that querying the same database using the same handle during a
progress callback would be a *bad* idea. Am I mistaken?
That would deadlock on handle's internal mutex or corrupt the handle
if your SQLite is compiled without multi-threading support.
Pavel
On Wed, Nov 2, 2011 at
On Mon, Oct 31, 2011 at 5:44 PM, Richard Hipp d...@sqlite.org wrote:
On Mon, Oct 31, 2011 at 5:40 PM, Pavel Ivanov paiva...@gmail.com wrote:
Error code 522 is SQLITE_IOERR_SHORT_READ. It is generated here:
http://www.sqlite.org/src/artifact/07acbb3e074e?ln=3012
SQLite was trying
Error code 522 is SQLITE_IOERR_SHORT_READ. It is generated here:
http://www.sqlite.org/src/artifact/07acbb3e074e?ln=3012
SQLite was trying to read N bytes and got back M byes where M0 and MN.
Could it be that N bytes cannot be read atomically and operation was
interrupted in the middle
What's wrong with the following (pseudo-code)?
begin immediate
x = result of (select max(j) from mytab;);
++x;
for (n=0; nnum; n++) // num may be greater than or equal to zero
{
insert into mytab (j) values (x);
}
commit
Just don't forget to create index on j.
Pavel
On
Using three tables (e.g. test.sh 111 112 113), the first command takes
13m3s, the second command takes 12m45s. I am wondering if there is any
magic to make the second script finish in 5 minutes by executing the
query in parallel ...
Try to execute pragma cache_size = 100 before executing
On Sat, Oct 22, 2011 at 6:02 PM, Bo Peng ben@gmail.com wrote:
You may create multiple threads, but your hard drive only has one set of
heads.
I now realize this problem and is moving the data to a faster drive.
However, when copying the data out, the activity monitor reports
40MB/sec
Anyway, the iostat output of my system is
2011 Oct 22 21:16:36, load: 0.03, disk_r: 2676 KB, disk_w: 0 KB
UID PID PPID CMD DEVICE MAJ MIN D BYTES
0 0 0 ?? 14 8 65536
503 732 730 sqlite3
Because of the trigger's insertion into the second table, should not the
second select statement return a value of 2 instead of 1 since the last
insertion occurred in table t_log?
http://www.sqlite.org/c3ref/last_insert_rowid.html
If an INSERT occurs within a trigger or within a virtual table
Do not include sqlite3ext.h. Applications need only sqlite3.h.
Pavel
On Thu, Oct 20, 2011 at 11:02 AM, Arbol One arbol...@gmail.com wrote:
Hey kids, I am testing SQLite in the hope that I can use it in my program,
but I get this confusing error msg, Can anybody help?
Error message
I would expect a column header of a for all of these queries, and all other
databases I've tested with use a column header of a. Is this a bug in
SQLite?
Column name in the result set is undefined unless you define alias in
the query. So SQLite can name it whatever it wants.
Pavel
On
This seems to be a bug. Is there a way to submit this as a bug somewhere or
is this the proper way for me to raise this to someone's attention that would
be interested in fixing this? Apologies for not understanding the bug
submission process better.
I'd say this is definitely a bug. And
FYI: http://www.sqlite.org/src/info/150592b4b4.
Pavel
On Thu, Oct 13, 2011 at 10:34 AM, Black, Michael (IS)
michael.bla...@ngc.com wrote:
Or rather user UpperToLower...I just found that one...
if( UpperToLower(zLeft[0])=='p' ){
Michael D. Black
Senior Scientist
NG Information
(foreign key mismatch)
It means there is a problem with a foreign key definition in the
database schema. Either an FK specifies parent columns that do not
exist, or parent columns that are not a PRIMARY KEY or UNIQUE.
It works on MacOSX with sqlite 3.4.0, and the exact same code fails
On Wed, Oct 12, 2011 at 9:08 AM, Steffen Mangold
steffen.mang...@balticsd.de wrote:
Igor Tandetnik wrote:
What's DateTimeOffset? Offset from what to what? What exactly are you trying
to achieve?
See if this helps: http://www.sqlite.org/lang_datefunc.html
In C# (.Net) it is the type Timespan.
I can confirm this with the following script:
SQLite version 3.7.5
Enter .help for instructions
Enter SQL statements terminated with a ;
sqlite create table t (a, b);
sqlite insert into t values (1, 't');
sqlite insert into t values (1, 't');
sqlite insert into t values (1, 'T');
sqlite insert
On Wed, Oct 12, 2011 at 11:28 AM, Simon Slavin slav...@bigfraud.org wrote:
However, along the way ...
sqlite select a, case when b = 't' then 1 end, case when
... b = 'T' then 1 end from t;
1|1|
1|1|
1||1
2|1|
2||1
2||1
sqlite select a, case when b = 't' then 1 end, case when
... b
On Wed, Oct 12, 2011 at 11:12 AM, Ivan Shmakov i...@gray.siamics.net wrote:
Given some way to construct a sqlite3_value wrapping object, I
could instead rely on sqlite3_bind_value () alone, thus
eliminating the necessity of type specifiers in the interface.
Well, a hypothetical API
SELECT * from test WHERE PK1100 AND PK1200; SELECT * from test WHERE
PK1100 LIMIT 100; Will the above queries have the same effect? Or will
LIMIT behave differently, i.e. get the entire result set and then return the
first 100 from it?
If your PK1 has no gaps then those two queries will
I've tried:
replace(Name, x'f87f', '') but it doesn't seem to match the weird character.
Any ideas?
I guess x'f87f' will match your character only if your database is in
UTF-16. For UTF-8 you probably should try x'efa1bf'. And maybe
explicit conversion to text is needed.
Pavel
On Mon, Oct
As can be guessed populating table is quite slow - ~150ms for around 10k rows
in IndexME.
Why do you think it's slow? 6 rows per second is insanely fast.
Pavel
On Sun, Oct 2, 2011 at 5:49 AM, Mira Suk mira@centrum.cz wrote:
Hey everyone,
currently I have some temporary table
On Sat, Sep 24, 2011 at 7:35 AM, Sami Liedes slie...@cc.hut.fi wrote:
On Fri, Sep 23, 2011 at 10:26:43PM -0400, Pavel Ivanov wrote:
if (A || 1) ...
You can get (e) by giving test cases for A and !A, but most certainly
flipping A does not independently affect the outcome as required
if (A || 1) ...
You can get (e) by giving test cases for A and !A, but most certainly
flipping A does not independently affect the outcome as required by
the plain reading of (f).
I'm pretty sure that the latest versions of modern compilers will
optimize the above if statement to the
What would be the best way to communicate with the DB? Would it make sense
just to have one linux shared library containing the DB API ? (I am a Linux
newbie too -- so this might be a stupid question -- I am not sure ) Or
perhaps one library for CGI and one for the application? Or perhaps
If the user supplies the length of the argument rather than using -1,
bind_text expects that this length exclude the null termination, whereas
prepare apparently expects it to include the null termination.
Can I challenge you in that this conclusion is wrong? Everywhere in
the development
1. Does BLOB type field cause any performance issues compared to using TEXT
when doing inserts/updates. In other words, if they use the same number of
bytes, would there be any difference in performance?
I believe it's a little weird choice as TEXT fields have some
additional features that
In this example I added 10 objects to the context and I know that object #5
raises a PrimaryKey (or unique) Exception. What I read from the SQLite
documentation I understand that object #6 till object #10 will be also add
to the database. But this never happens. I assume you mean that you
This query works fine:
SELECT * FROM eloResultTable
This query returns Error 11 - Database disk image is malformed
SELECT * FROM eloResultTable ORDER BY elo DESC
Any ideas?
REINDEX eloResultScore;
should help you.
Pavel
On Thu, Sep 8, 2011 at 9:22 AM, Ian Hardingham i...@omroth.com
Well, in the first code example, yes you need to free your peekText pointer.
Since you passed SQLITE_STATIC for the destructor parameter to
sqlite3_bind_text, you should free it before you exit the function and not
before. If you use SQLITE_TRANSIENT, you can free it immediately after the
Does anyone know why the performance degrades this way and what can be done
to resolve the problem?
Do you have by any chance shared cache turned on? I believe when
shared cache is used SQLite searches through all open databases to
understand if the one you want to open is already opened and
Do you set of PRGAMAS uncompatible ? e;g:
setting synchronous=true + journal_mode=off is a non sense for sqlite
so engine can't deliver connections
I think I now see what you want: a table saying if you have PRAGMA A set to
THIS, then PRAGMA B has no effect.
Personally I don't know of any
I know
that some databases have encrypted stored procedures. Does sqlite
have something similar?
SQLite doesn't have any kind of stored procedures.
if someone
was ambitious enough, they could just attach a debugger to my process
and see the plain strings.
If someone was ambitious enough
http://www.sqlite.org/wal.html
Disadvantage #2:
All processes using a database must be on the same host computer; WAL
does not work over a network filesystem.
So as long as all users of your database are on the same host it seems
that WAL will work even if file is on NFS. But then what's the
i saw the same behaviour with Oracle's CLI client
(sqlplus) - as long as i had sqlplus opened and connected, my PHP pages
couldn't insert any data.
i.e. this type of problem isn't limited to sqlite3.
This is completely unrelated because Oracle works differently. And if
you saw this locking
Did you see the code in the link I provided? It's a function that can be
added to SQL.
Note, it's not SQL. SQL doesn't support adding functions. SQL is all
about SELECT/INSERT/UPDATE/DELETE + DDL commands (like CREATE TABLE).
That's it. So the link you provided is a function that can be added
If that is indeed the case, the current code will cause corruption on an
EINTR on such platforms because the EINTR handling does not account for a
non-0 write.
No, it won't cause corruption. Because SQLite uses pwrite or its
alternative with calls to lseek and write. So after interruption it
If you don't want your library behavior to be changed when process
receives some signals then you have to use such or some similar
approach.
Pavel
On Thu, Aug 18, 2011 at 9:38 AM, Stephan Beal sgb...@googlemail.com wrote:
Hi, sqlite3 hackers,
i'm taking a look at os_unix.c:
do{ got =
Is it possible to create Storedprocedure or Functions in Sqlite. ?
No.
Since i am new to Sqlite. Can u suggest some best sites or links to learn
Sqlite (ofcourse i saw Sqlite.org site)
Other than sqlite.org you can look at google.com. It is usually very
good at finding answers on
I think it will have better performance if you do that in your
programming language. But if you insist on SQL it would look like
this:
update table_name set IVmean =
(select sum(IVsum)/sum(IVcount) from table_name t
where t.Longitude = table_name.Longitude
and t.Distance = table_name.Distance);
-0400
From: Pavel Ivanov paiva...@gmail.com
Subject: Re: [sqlite] Read only scaling optimization
To: General Discussion of SQLite Database sqlite-users@sqlite.org
Message-ID:
cag1a4rt+pkj2ingy0jeym6h2vfikownlnx1bqgn-9hydput...@mail.gmail.com
Content-Type: text/plain; charset=ISO-8859-1
I have a Driver doing this pulling in 32 queries aimed at randomness and
different tables, much like that would be experienced in typical usage. Best
performance comes from having 2 separate programs running on 2 separate
files.
I'm no expert, but that suggests to me that your bottleneck is
A simple select * from table query takes twice as longer time in sqlite
compared to sql server express, Both use the same data structure and exactly
the same code except for the connection and command objects.
Everything is the same except providers and principles of how database
works. I see
Don't use sqlite3_exec. Use sqlite3_prepare16 (which accepts wchar_t*),
sqlite3_step, sqlite3_finalize. Read text from columns with
sqlite3_column_text16 (which returns wchar_t*).
I'd say it's not exactly this way. AFAIK, wchar_t on Linux is
32-bit, but sqlite3_column_text16 will return
This is a known issue and it has an open ticket:
http://www.sqlite.org/src/tktview?name=23b2128201.
Pavel
On Wed, Aug 10, 2011 at 1:05 PM, Julien Laffaye kime...@gmail.com wrote:
Hello,
Is it possible to get more info when I get a constraint failed error
from the C API?
I am interested in
If you have one reader and many writers, consider PRAGMA journal_mode=WAL;
Richard meant one writer and many readers of course.
If the other process opens the db connection as read_only, will the hot
journal check be still done (during queries operations of the second
process)?
How is the
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