On 14 Nov 2018, at 4:20am, Sharma, Tanuj [AUTOSOL/FMP/IN]
wrote:
> I want to know why auto_checkpoint is not working when there is no Primary
> Key in the table.
If, during your testing, you're using existing database files, please create
new ones each time.
Can you please publish your sche
On 11/13/18, Sharma, Tanuj [AUTOSOL/FMP/IN] wrote:
> I have observed that when I don't have any primary key in the database table
> then WAL auto_checkpoint doesn't work
That's surprising because the WAL logic does not have anything to do
with primary keys. Those are two completely independent s
Dear SQL Developers / Users,
I am using Sqlite3 in our project. My database has journal_mode set to WAL and
has one writer & multiple readers. During normal mode of operation, only
writing process is accessing database and there is no active reader connection
I have observed that when I don't ha
On 12/19/2014 11:22 AM, Kushagradhi Bhowmik wrote:
I am writing continuously into a db file which has PRAGMA journal_mode=WAL,
PRAGMA journal_size_limit=0. My C++ program has two threads, one
reader(queries at 15 sec intervals) and one writer(inserts at 5 sec
intervals).
Every 3 min I am pausing
Readers do not need long-lasting transactions (if any at all), so I'd
rather suspect your writer to be the culprit. Does it use lasting
transactions? If so, make it commit the transaction before checkpointing.
regards
gerd
___
sqlite-users mailing lis
I am writing continuously into a db file which has PRAGMA journal_mode=WAL,
PRAGMA journal_size_limit=0. My C++ program has two threads, one
reader(queries at 15 sec intervals) and one writer(inserts at 5 sec
intervals).
Every 3 min I am pausing insertion to run a sqlite3_wal_checkpoint_v2()
from
> *The prgama PRAGMA journal_size_limit = **N , *does not seem to limit
> the size of the WAL log file. Is there any precondition to be
> satisfied before calling the pragma ?
I have same problem (on Windows). See this console session:
SQLite version 3.7.9 2011-11-01 00:52:41
Enter ".help" for i
Hello Richard,
*The prgama PRAGMA journal_size_limit = **N , *does not seem to limit the
size of the WAL log file. Is there any precondition to be satisfied before
calling the pragma ?
-Sreekumar
On Wed, Nov 30, 2011 at 7:04 PM, Teg wrote:
> Hello Richard,
>
> When does the WAL get trimmed do
Hello Richard,
Thanks again.
Wednesday, November 30, 2011, 5:37:32 PM, you wrote:
RH> On Wed, Nov 30, 2011 at 5:31 PM, Teg wrote:
>> Since we're on this topic
>>
>> If I open a 30 GB DB file, then attach a new empty DB and then
>> select/insert all the data from the full DB to th
On Wed, Nov 30, 2011 at 5:31 PM, Teg wrote:
> Since we're on this topic
>
> If I open a 30 GB DB file, then attach a new empty DB and then
> select/insert all the data from the full DB to the empty one, the WAL
> file grows to 4 times the size of the source file. Why is that?
>
> I
Since we're on this topic
If I open a 30 GB DB file, then attach a new empty DB and then
select/insert all the data from the full DB to the empty one, the WAL
file grows to 4 times the size of the source file. Why is that?
I don't believe I use any manual checkpointing. Just let WA
On 30 Nov 2011, at 7:01pm, Richard Hipp wrote:
> The wal file persists until the last connection to the database closes,
> then the wal file is deleted.
Actually this is the key to a lot of questions about this. If your WAL file is
taking up too much space, quit and restart your app. Or have
Hello Richard,
That's what I was hoping to hear. Thanks,
Wednesday, November 30, 2011, 2:01:46 PM, you wrote:
RH> On Wed, Nov 30, 2011 at 1:39 PM, Teg wrote:
>> Hello Richard,
>>
>> Appreciate the reply but, it doesn't address my question (unless I'm
>> missing something). I get that checkpo
On Wed, Nov 30, 2011 at 1:39 PM, Teg wrote:
> Hello Richard,
>
> Appreciate the reply but, it doesn't address my question (unless I'm
> missing something). I get that checkpointing doesn't reduce the size
> of the WAL. Assuming a single writer and no readers, If I perform a
> transaction that gen
nformation Systems
>
>
> From: sqlite-users-boun...@sqlite.org [sqlite-users-boun...@sqlite.org]
> on behalf of Richard Hipp [d...@sqlite.org]
> Sent: Wednesday, November 30, 2011 12:10 PM
> To: Teg; General Discussion of SQLite Database
> Subject
Hello Richard,
Appreciate the reply but, it doesn't address my question (unless I'm
missing something). I get that checkpointing doesn't reduce the size
of the WAL. Assuming a single writer and no readers, If I perform a
transaction that generates a WAL file. Does it eventually get deleted
when I
g; General Discussion of SQLite Database
Subject: EXT :Re: [sqlite] WAL file size
On Wed, Nov 30, 2011 at 1:04 PM, Teg wrote:
> Hello Richard,
>
> When does the WAL get trimmed down? If my transaction completes, does
> the WAL file get deleted? I've seen the WAL grow to 4 times my act
On Wed, Nov 30, 2011 at 1:04 PM, Teg wrote:
> Hello Richard,
>
> When does the WAL get trimmed down? If my transaction completes, does
> the WAL file get deleted? I've seen the WAL grow to 4 times my actual
> DB size so, I don't really want 160 Gigs of WAL hanging out when the
> process that
Hi Richard,
How does sqlite determine the right size for the WAL file? Application can
ofcourse indicate the maximum size.
-Sreekumar
On Wed, Nov 30, 2011 at 4:02 PM, Richard Hipp wrote:
> On Wed, Nov 30, 2011 at 4:41 AM, Sreekumar TP >wrote:
>
> > Hello,
> >
> > I have sqlite configure to do
Hello Richard,
When does the WAL get trimmed down? If my transaction completes, does
the WAL file get deleted? I've seen the WAL grow to 4 times my actual
DB size so, I don't really want 160 Gigs of WAL hanging out when the
process that generated it is only run once a month.
Wednesday, Novem
On Wed, Nov 30, 2011 at 4:02 PM, Richard Hipp wrote:
> On Wed, Nov 30, 2011 at 4:41 AM, Sreekumar TP >wrote:
>
> > Hello,
> >
> > I have sqlite configure to do manual checkpoint. I do checkpoint every
> few
> > hundred records. I expect the WAL to reduce in size and become zero when
> > there ar
On Wed, Nov 30, 2011 at 4:41 AM, Sreekumar TP wrote:
> Hello,
>
> I have sqlite configure to do manual checkpoint. I do checkpoint every few
> hundred records. I expect the WAL to reduce in size and become zero when
> there are no more inserts done.
> However, I see that the WAL file size is stati
Hello,
I have sqlite configure to do manual checkpoint. I do checkpoint every few
hundred records. I expect the WAL to reduce in size and become zero when
there are no more inserts done.
However, I see that the WAL file size is static and does not reduce in
size. Why isnt manual checkpoint reduci
On Thu, Feb 10, 2011 at 6:04 PM, Richard Hipp wrote:
> There needs to be a time when there are no read or write transactions using
> the WAL so that it can reset, and you need to run PRAGMA wal_checkpoint
> during that time. Otherwise the WAL will grow without bound.
>
> See also the RESET option
On Thu, Feb 10, 2011 at 6:45 PM, Michael Barton wrote:
> Is there something I need to do to keep my sqlite WAL files from
> getting huge with 3.7.5?
>
> -rw--- 1 swift swift 152M 2011-02-10 23:43
> b7fa56688b61c70ef29ed2ad94b7beeb.db
> -rw--- 1 swift swift 19M 2011-02-10 23:43
> b7fa56688
Is there something I need to do to keep my sqlite WAL files from
getting huge with 3.7.5?
-rw--- 1 swift swift 152M 2011-02-10 23:43
b7fa56688b61c70ef29ed2ad94b7beeb.db
-rw--- 1 swift swift 19M 2011-02-10 23:43
b7fa56688b61c70ef29ed2ad94b7beeb.db-shm
-rw--- 1 swift swift 2.4G 2011-02-
On Tue, Dec 7, 2010 at 9:49 AM, Yoni Londner wrote:
> Hi,
>
> Yes, in this scheme the checksum is based on salt values and own frame
> content.a
>
> Note that the current design solve a potential DB corruption bug in
> sqlite. current WAL design is base on the fact that once sqlite writes
> pages
Hi,
It's clear that for the WAL to be a general purpose solution, which can
be used in systems which have constant stream of reads/writes from
sqlite, it should not grow limitlessly under all circumstances (assuming
the user run a checkpoint every once in a while).
I think my design can work (
On 12/07/2010 09:49 PM, Yoni Londner wrote:
> Hi,
>
> Yes, in this scheme the checksum is based on salt values and own frame
> content.a
>
> Note that the current design solve a potential DB corruption bug in
> sqlite. current WAL design is base on the fact that once sqlite writes
> pages successfu
Hi,
Yes, in this scheme the checksum is based on salt values and own frame
content.a
Note that the current design solve a potential DB corruption bug in
sqlite. current WAL design is base on the fact that once sqlite writes
pages successfully to the WAL, they will never get corrupted. but this
In the current WAL format, the checksum for each frame is based on
the contents of the frame, the salt-values in the wal header and the
checksum of the previous frame.
In this scheme is each frame checksum independent? i.e. each frame
checksum is computed based only on the salt values in the WAL
Hi,
I meant to run the checkpoint in another thread (see my attached example
program), but it can be even from another process.
What happens when it crashes? well, the programmer have to decide how he
handle checkpoints. he can use auto_checkpoint, he can stop
auto_checkpoint and do checkpoint
You seem to use such term as "background checkpointing". What's that?
Who runs this background process and what happens when it crashes
(when all other readers/writers are still working)?
Pavel
On Thu, Dec 2, 2010 at 11:04 AM, Yoni Londner wrote:
> Hi,
>
> I will start out by stating that I am
Hi,
I will start out by stating that I am not deeply familiar with the
sqlite & WAL file layout, but I will try anyway, from my current
understanding:
The general problem that needs to be solved is to allow SQLITE to be
constantly used over time (with no 'idle' time where no sql operations
ar
> Well, I love sqlite, and I want to continue using it (small, fast,
> reliable ...).
> I think it is better to solve such problems inside sqlite
It's impossible. Just try to design the solution you want. Think of
how SQLite should behave to make you happy, think of it with all
details and don't f
Hi,
> For a large scale system you have a third choice: use some other RDBMS
> which is implemented in one process and has a much better control over
> its data and much better communication between readers and writers.
Well, I love sqlite, and I want to continue using it (small, fast,
reliabl
mplementation than what currently
>> exists. I imagine it's quite a task for the SQLite developers to
>> get 100% branch test coverage.
>>
>> On one system of mine, where blocking is an issue, I
>> buffer up the write messages, and flush them on a background thread.
>
ni
Sent: 25 November 2010 11:08 AM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] WAL file size
Hi,
> In which case the writer would have to block on the reader,
> which is something that the current system doesn't suffer from.
I agree when we are talking about small systems, which
coverage.
>
> On one system of mine, where blocking is an issue, I
> buffer up the write messages, and flush them on a background thread.
> Of course this may not be practical for you...
>
> Ben
>
> -Original Message-
> From: sqlite-users-boun...@sqlite.org
&
lf Of Yoni
Sent: 24 November 2010 04:46 PM
To: sqlite-users@sqlite.org
Subject: [sqlite] WAL file size
Hi,
I am currently developing a system, which have the following requirements:
1. should be very fast and responsive
2. run forever (or at least a very long time) without restart.
3. have steady s
Hi,
I am currently developing a system, which have the following requirements:
1. should be very fast and responsive
2. run forever (or at least a very long time) without restart.
3. have steady stream of writes to the DB.
Currently I am using sqlite with one sql connection, and I run sql
checkp
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