On 10 Nov 2017, at 8:49am, advancenOO wrote:
>hAve you optimised your column orders ?
What is optimal?
- Howard
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t of proportion to the data. So far the only definitive statement I
> can make is ANALYZE on a table that went from 0 records to 1+ notably
> improves queries by orders of magnitude.
> - Howard
>
>
> -Original Message-
> From: sqlite-users
> [mailto:sqlite-users
ge-
From: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] On
Behalf Of Simon Slavin
Sent: Tuesday, October 3, 2017 6:40 PM
To: SQLite mailing list
Subject: Re: [sqlite] PRAGMA optimize; == no busy handler?
On 4 Oct 2017, at 2:23am, Howard Kapustein
wrote:
> What do y
rd
-Original Message-
From: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] On
Behalf Of Simon Slavin
Sent: Tuesday, October 3, 2017 5:31 PM
To: SQLite mailing list
Subject: Re: [sqlite] PRAGMA optimize; == no busy handler?
On 4 Oct 2017, at 12:54am, Howard Kapustein
wrote
Using SQLite 3.20.1 I notice a flood of log events sometimes when I call PRAGMA
optimize;
Warning 0x5: statement aborts at 1: [PRAGMA optimize;] database is locked
And a few times
Warning 0x5: statement aborts at 2: [PRAGMA optimize;] database is locked
And even once
Warning 0x5: statement aborts
Looking through the source a bit I see sqlite3_busy_timeout is a no-fail
operation (aside from misuse) so sqlite3_busy_timeout(0);
SQLITE_CHECKPOINT_TRUNCATEsqlite3_busy_timeout(n); does what I need. Thanks
all.
- Howard
P.S. sqlite3_close intentionally doesn't respect journal_size_li
I use journal_mode=WAL and have periods of checkpoint starvation (complicated
reasons) so I'm looking to prune the -wal file but in less blunt way than
SQLITE_CHECKPOINT_TRUNCATE.
Behaviorally I want SQLITE_CHECKPOINT_PASSIVE *and then* if required -wal
content < journal_size_limit, to do the t
The docs are a little unclear =>
https://sqlite.org/pragma.html#pragma_journal_size_limit
I need to disable autocheckpoint@close (for other reasons) so I'm looking for
ways to fence the -wal file. If I want to bound a database's -wal file to <=1MB
when I'm not in a transaction is it just PRAGMA
** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL or RESTART.
*/
SQLITE_PRIVATE int sqlite3Checkpoint(sqlite3 *db, int iDb, int eMode, int
*pnLog, int *pnCkpt){
The comment should be
** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL, RESTART or
TRUNCATE.
__
sqlite> create table blah(id integer primary key not null, x text, y integer
not null);
sqlite> create index blahindex on blah (y);
sqlite> explain query plan select * from blah where y & ? != 0;
0|0|0|SCAN TABLE blah
But other numeric expressions do e.g.
sqlite> explain query plan select * from
>> Is it possible to use the CLI to read a WAL database and exit without
>> modifying the database?
>>
>The checkpoint-on-close feature is not affected by
>PRAGMA wal_autocheckpoint. The NO_CKPT_ON_CLOSE DB config flag is the
>only mechanism to prevent it from inside the connection.
SQLITE_API
I can set a trace hook and I can clear a trace hook, but I don't see any way to
tell if a sqlite3* has a trace hook registered
If not then consider this a feature request :P e.g. int sqlite3_db_config(db,
SQLITE_DBCONFIG_TRACE) returning an OR'd combination of SQLITE_TRACE_* as you'd
set via
I can set a trace hook and I can clear a trace hook, but I don't see any way to
tell if a sqlite3* has a trace hook registered
If not then consider this a feature request :P e.g. int sqlite3_db_config(db,
SQLITE_DBCONFIG_TRACE) returning an OR'd combination of SQLITE_TRACE_* as you'd
set via sq
https://www.sqlite.org/c3ref/c_dbconfig_enable_fkey.html
The prototype is effectively
int sqlite3_db_config(sqlite3* db, int SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE, int
on, int* value)
where
on: >0 == disable, 0 == enable, <0=GET CURRENT VALUE
value: optional, if not nullptr then on success contains 0=
https://www.sqlite.org/c3ref/c_dbconfig_enable_fkey.html
The prototype is effectively
int sqlite3_db_config(sqlite3* db, int SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE, int
on, int* value)
where
on: >0 == disable, 0 == enable, <0=GET CURRENT VALUE
value: optional, if not nullptr then on success contains 0=
I can set a trace hook and I can clear a trace hook, but I don't see any way to
tell if a sqlite3* has a trace hook registered
If not then consider this a feature request :P e.g. int sqlite3_db_config(db,
SQLITE_DBCONFIG_TRACE) returning an OR'd combination of SQLITE_TRACE_* as you'd
set via sq
I've got WAL databases that I'm trying to do analysis on and DON'T want them
modified. I can PRAGMA wal_autocheckpoint=0; to disable auto-checkpoint'ing but
when I exit the shell I see auto-checkpoint'ing is done -- foo.db-wal and
foo.db-shm are gone and foo.db is modified. That's bad. I can't m
issues.
Suggestions?
-Original Message-
From: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] On
Behalf Of Clemens Ladisch
Sent: Friday, April 21, 2017 11:13 PM
To: sqlite-users@mailinglists.sqlite.org
Subject: Re: [sqlite] 0x11C: automatic index warning for CTEs ?
Howar
I'm setting SQLite logging a warning
Warning 0x11C: automatic index on PackageIdByAll(_PackageID)
Whenever I run this SQL
WITH
PackageIdByUser(_PackageID) AS (
SELECT _PackageID FROM Package AS p
INNER JOIN PackageUser AS pu ON pu.Package=p._PackageID
WHERE pu.User=?1 AND p._W
>There cannot be a fully portable way, because path specifications are not
>portable
Which begs the question, why isn't there an xGetTempFilename VFS function in
sqlite3_vfs?
Wouldn't the simplify things? Have the VFS handle it apropos, with the default
VFS' in SQLite (or an older VFS lacking i
You can compile SQLite using CreateFile instead of CreateFile2. That doesn't
have the allowed-paths restriction (among other things).
But you won't pass WACK so Store will reject your submission.
The solution is to change CreateFile2 to support removable media w/the
capability check (or some cr
>> Thank you for your really specific answer, I will go to the IoT forum,
>> insider, etc to make the request.
>Don't bother. They won't change it. The inability to access these places is
>intentional. It means that programs can't read each-other's files so malware
>programs (e.g. spyware, r
SQLite uses CreateFile2 in a Windows store aka UWP application
https://msdn.microsoft.com/en-us/library/windows/desktop/hh449422(v=vs.85).aspx
When called from a Windows Store app, CreateFile2 is simplified. You can open
only files or directories inside the ApplicationData.LocalFolder or
Package.
seful what's
likeliest to be smoothest to be accepted as a patch.
- Howard
-Original Message-
From: Joe Mistachkin [mailto:j...@mistachkin.com]
Sent: Friday, April 3, 2015 10:35 AM
To: 'General Discussion of SQLite Database'
Cc: Howard Kapustein
Subject: RE:
ping
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From: Howard Kapustein
Sent: Monday, March 9, 2015 10:10
Has anyone considered supporting SQLITE_SYNC_DATAONLY on Windows using
NtFlushBuffersFileEx?
http://msdn.microsoft.com/en-us/library/windows/hardware/hh967720(v=vs.85).aspx
>When the SQLITE_SYNC_DATAONLY flag is used, it means that the sync operation
>only needs to flush data to mass storage. Ino
The Win32 DLL download includes a .def file, but comparing the exports with the
documentation's function page shows several inconsistencies
doc but not .def
* sqlite3_mutex_held
* sqlite3_mutex_notheld
* sqlite3_unlock_notify
* sqlite3_version (not a real API just a page name f
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