other rdbms.
>
> --
>
>
>
> Thanks & Regards
>
> Irfan Khan
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-
In fts3_tokenizer.c these lines are invalid:
#include "sqlite3ext.h"
#ifndef SQLITE_CORE
SQLITE_EXTENSION_INIT1
#endif
Use single line instead:
#include "sqlite3.h"
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As example, we have view:
create view vtest as select name1 || ' ' || name2 as name from test;
How to get the definition of "name" field (will be "name1 || ' ' ||
name2")? Of cource, the view can be more complex.
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The new PRAGMA or Virtual Table will be more useful. But I don't sure
about possibility of this.
2011/6/14 Nico Williams :
> On Tue, Jun 14, 2011 at 1:58 PM, Alexey Pechnikov
> wrote:
>> As example, we have view:
>>
>> create view vtest as select name1 || &
VIEW b as select * from a;
This strange, really. View cannot reference objects in attached
databases but view can reference deleted object?
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, free or affordable?
>
> Thank you.
>
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from sqlite_master;
Error: malformed database schema (job_user_id_idx) - no such table:
main.job_record
.dump
...
sqlite> pragma integrity_check;
*** in database main ***
Page 5 is never used
Page 35 is never used
Page 67 is never used
Page 97 is never used
....
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See FTS3 extension where the full-text index is stored in multi btree
in regular tables. Note: FTS2 is more simple.
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I want to add stopwords table support for ICU tokenizer but there is
no database handle access (icuOpen).
Any ideas?
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With synonyms dictionary the result token length can be more then
original token length.
Is it problem for current realization of FTS?
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http
With 0-length token in icuNext there is the error:
Error: SQL logic error or missing database
May xNext returns 0 length when the token is stopword?
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"Open Source SQLite DBMS" will not useful.
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from fts where fts match 'sqlite educate'
SQLite may be useful for education
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mmed SQLite FTS4 search and
enjoy by fast work.
Note: you can guess the admin user password :D
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stgreSQL full-text search
as example. It's very common task for many applications.
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rmed
> to 'dbms educate' before it is run.
I wanted to say - we can't rank results differently. The query 'sqlite educate'
may return result 'dbms education' with low rank and 'sqlite education'
with high rank.
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h
http://sqlite.mobigroup.ru/artifact/56df1be3c402d7d49c3a13be704a2ff22c3003d2
http://sqlite.mobigroup.ru/dir?name=ext/compress
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scussion suggests a nifty trick to
> overcome this.
And you can get the content size without decompression. It can be useful.
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'a c b');
a b c
SELECT TCLCMD('lsort', '-decreasing', 'a c b');
c b a
SELECT TCLCMD('lreverse', 'a c b');
b c a
SELECT TCLCMD('lsearch', 'a c b', 'b');
2
SELECT TCLCMD('lsearch', 'a c b', 'd');
-1
See details here: http://sqlite.mobigroup.ru/wiki?name=ext_tcl
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LevelDB use append log but SQLite is tested without WAL :)
I check and some tests 2.5x faster with WAL.
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: 228.869 micros/op;0.5 MB/s (1 ops)
fillseqbatch : 56.131 micros/op;2.0 MB/s
...
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here:
http://pastebin.com/dM2iqdvj
And patch as above plus integer keys instead of blobs
http://pastebin.com/CnBeChWg
P.S. For blob-to-blob mapping we may use table with index on hashed key.
Virtual table can simplify this.
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B/s (1000 ops)
crc32c : 11.447 micros/op; 341.2 MB/s (4K per op)
snappycomp : 8.106 micros/op; (snappy failure)
snappyuncomp : 26.941 micros/op; (snappy failure)
acquireload : 1.407 micros/op; (each op is 1000 loads)
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tests faster.
P.S. There is constant database created by DJB. And exists patch to
drop "constant"
limitation. IMHO it's functionally equal and better solution than LevelDB...
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__
ey need and is lots cheaper.
And single-thread without correct synchronous. Plus full in-memory
copy of LevelDB log.
And tests is adopted for specific scenarious (IMHO test of fixed value
size is incorrect).
I'm sure key-value database may be faster.
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Very interesting annonce:
http://www.couchbase.com/press-releases/unql-query-language
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-exists "test_record"
rows from host A to host B and from B to A and then regenerate some
rows in "test" tables.
And Fossil is well-known example of SQLite database replication :D
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and revert any changes.
I think easy replication is not feature of NoSQL solutions. With big
disks we can create and
use append-only datasets in SQL DBMS. And virtual table can
incapsulate all details.
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code knows the semantics of the data.
You write extra code to find and resolve CouchDB replication conflicts but you
are speak about "do not have to write extra code". One of these
approvals is false!
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ata. There are a lot of causes of _potential_
conflicts and replication is only one
of these. Replication is aggregation process but is not "silver
bullet" for extracting correct data.
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want it?
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2011/8/1 Black, Michael (IS) :
> This is a side-question to this thread...but has anybody every done row-level
> locking for edit?
What problem are you solving?
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2011/8/1 Simon Slavin :
>
> On 1 Aug 2011, at 6:56pm, Alexey Pechnikov wrote:
>
>> 2011/8/1 Black, Michael (IS) :
>>> This is a side-question to this thread...but has anybody every done
>>> row-level locking for edit?
>>
>> What problem are you solv
2011/8/1 Simon Slavin :
> I'm sorry Alexey, I was trying to be funny and failed. Your question is very
> important for this situation.
Oh, I'm sorry! My english is bad by night :)
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__
2011/8/2 Eric Scouten :
> It falls apart badly in a highly distributed environment where ...
>
> ...
May be a RDF storage is more reasonable for this. Operations with
atomic facts can be highly distributed. And SPARQL is similar to SQL.
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RDF or other data format.
I don't see your problem. May be you want any different?..
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esign ideas were cribbed from:
http://www.sqlite.org/cvstrac/wiki?p=UndoRedo
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orizer function).
Does somebody interesting in this functionality too?
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2011/8/7 Simon Slavin :
> For example,
>
> SELECT * FROM cars WHERE cars.name IN ('Corolla', 'Fiesta')
create table t (names TEXT);
insert into t(name) values ('Corolla Fiesta');
SELECT * FROM cars WHERE cars.name IN (select names from t where rowid=1);
-
BODY$
return [llength $1]
$BODY$
LANGUAGE 'pltcl' IMMUTABLE;
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about 1000
items and there are
1 000 000 lists than the table of relations (t1.rowid, t2.rowid) will
have 1 000 000 000
rows! It's too slow and is not useful in real world. Of cource all
systems store lists of
identifiers in similar situations.
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ery slow.
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ee my test script for Igor.
We can fast search any id by using "match" operator on FTS table.
P.S. FTS table has nice scalability. Check insertion a lot of records
and insertion speed is constant. I did try 400 millions of records
(and did get database size > 100 Gb).
--
2011/8/10 Wiktor Adamski :
> You
> may try increasing page size - bigger block means less near-random
> reads from the disc.
It's good way. With page size 8k instead of default 1k selects performance
may increasing ~3x. Note: PostgreSQL use 8k disk pages.
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2011/8/11 Sumit Gupta :
> 10-10-2011 18:48:42, 10,20, 30, 40, 50, 60, 80 .. <48 such entries>
Use unixtime (time in seconds) and index on this field and your
queries will be fast.
You can use single blob as integers array for more compact database.
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iour. Is needed the sources of the test programm.
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erome, different environments may
have different pragmas...
we don't know about your environment enough. You may show some
problematic tests as example.
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sqlite-us
_
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> a joker...
Database corruption can't be the result of the coping from temp in-memory
database to main disk-database!
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2011/9/6 jerome moliere :
> Could you give me more details about corruption cases ?
> Is there a list of contexts where we can get corrupted tables ?
http://www.sqlite.org/howtocorrupt.html
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te-users@sqlite.org
>> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
>>
>
>
>
> --
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ob.html
>
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_
t; details if needed.
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d efficiently via TEXT INDEX too. But if the overhead is
> comparable, I'd rather use FTS.
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>
2011/10/19 Fabian :
> Thanks, that's good to hear! It makes me wonder why SQLite doesn't use that
> same multi-tree mechanism for regular indexes, but that's a whole different
> question.
It's impossible with SQLite3 database format. May be SQLite4 will be
support it
FTS table, but causes some overhead for full-text queries that use the index."
So you can work with a big FTS tables without using the "optimize" method.
I use some FTS tables with tens of millions records and effect of the
"optimize"
isn't mea
2011/10/25 Dan Kennedy :
> Not possible. The Tcl interface has no bindings for either the
> virtual table or VFS interfaces.
But why? Is there any technical/ideological problems?
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(m.op->stmt);
> }
> else gerror("bind \n");
> }
> void init_gbase() {
> m.status = sqlite3_open(GBASE,&m.db);
> debug("Gbase");
> m.status = sqlite3_create_function_v2(m.db,GFUN,2,SQLITE_UTF8
> ,0,gfunction,0,0,
> NULL);
> m.status = sqlite3_prepare_v2(m.db,POP_SQL, strlen(POP_SQL),
> &operands[G_POP].stmt,0);
> m.status = sqlite3_prepare_v2(m.db,TEST_SQL, strlen(TEST_SQL),
> &operands[G_TEST].stmt,0);
>
> }
>
> int _tmain(int argc, _TCHAR* argv[])
> {
> init_dll();
> init_gbase();
> m.top=POP_TRIPLE;
> for(;;) {
> m.status = SQLITE_OK;
> m.called = POP_TRIPLE;
> if(m.status == G_RESTART)
> m.self_rowid=0;
> read_triples();}
> }
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>
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.16, but a beta version
> supports 3.7.3), and it uses a more restrictive license (not hard, since any
> license is more restrictive than SQLite's non-license!)
It can be used as extensions set for any new SQLite version.
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The problem can be fixed by variables bindings patch:
http://sqlite.mobigroup.ru/wiki?name=tclsqlite
I think, you can do same for you lang.
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backward compability problem
wil not be resolved by upstream. So I did write patch for myself.
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Of cource you may report your bug! But I'm not sure about possibility
of the bugfix in upstream and so I speak about patch to SQLite binding
for your language.
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send link to SQLite documentation instead of any astral reasons.
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bug report, feature request)
> TIA
> -Laco.
>
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gt;> See
>> PRAGMA cache_size
>> PRAGMA synchronous
>>
>> In particular the page cache should be increased dramatically
>> for huge DB files.
>>
>> Marcus
>>
>> >
>> > Thanks,
>> >
>> > Udi
>> > ___
s/database? Does powersave overwrite feature conflicts
with idea of per pages
checksums?
P.S. The article "Berkeley DB Recoverability" provides some info about
WAL+checksum mode:
http://help.bdbxml.net/html/ed539869-eebd-478f-97de-7e5377e87f66.htm
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o
dd if=backup.db of=corrupted.db bs=4096 count=100
and repair after database by using per pages checksums.
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and happy write
> bursts on each COMMIT). What is sqlite reading there? Does it try to
> perfectly balance each index on each insert (million times per
> transaction) or something else?
>
> Sincerely,
> Valentin Davydov.
> _______
> sq
t; puts $b_list
> }
>
>
>
>
>
>
> Each of these needs something added; either the rowid to the output or
> a counter test.
> is there a better way??
>
>
> Thanks
>
> P.S. can the TCL sqlite3 statement open the database using command switchs
> (ie
> Please let me know.
> Thanks.
> --
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