One presumes that you mayhaps read the documentation?
"In WAL mode when synchronous is NORMAL (1), the WAL file is synchronized
before each checkpoint and the database file is synchronized after each
completed checkpoint and the WAL file header is synchronized when a WAL file
begins to be reus
Thanks Dan for this information!
(For some reason, your reply appears on the mailing list archive, but never
found the way of my inbox. I'm replying to my own message)
Gwendal
> Dan Kennedy wrote:
>
> "PRAGMA schema_version" should work the same way in WAL mode. The pragma
> will read the "da
On Sat, 2017-12-30 at 05:40 +, Simon Slavin wrote:
> Accumulate your change commands in memory as text. Eventually
> execute them all inside BEGIN … COMMIT.
I like it; why didn't I think of it? Don't you love those moments?
The application would need severe retooling for reads unless I also
On 30 Dec 2017, at 5:37am, Ian Freeman wrote:
> Agreed, the defaults would be very safe. But I realize I never
> mentioned what my actual goal was: minimizing disk writes for a write-
> heavy application. That's why I want to run -wal out of memory, or set
> synchronous=NORMAL. Of course, I canno
On Fri, 2017-12-29 at 22:18 +, Simon Slavin wrote:
>
> On 29 Dec 2017, at 7:07pm, Ian Freeman wrote:
>
> > Thanks, Simon. Indeed I did see that option. But I'm concerned
> > about
> > maintaining integrity in the middle of an power-interrupted commit,
>
> This is not a problem for either WA
I think it's possible with CTE.
Recently I wondered whether it would be possible to implement an operation
that might be called "an accumulated group by". It's when you enumerate the
rows and based on the values of the previous row and current row you apply
some new "group" value that can be used
On 29 Dec 2017, at 7:07pm, Ian Freeman wrote:
> Thanks, Simon. Indeed I did see that option. But I'm concerned about
> maintaining integrity in the middle of an power-interrupted commit,
This is not a problem for either WAL mode or the older journal modes. If you
avoid these commands
PRAGMA
I tried the new write feature. Not sure if intended but read back row
order is somewhat unintuitive. Is there an easy way to create a functional
archive read back order without introducing sortable name prefix artifacts
or an index file entry?
CREATE VIRTUAL TABLE newzip USING zipfile('new.zip')
I believe the inotifywait does not actually wait for the fsync operation before
notifying.
Process A can write to a file, the OS can cache it without flushing to disk,
and a request by process B will be served directly from the cache. Therefore
the operating system can notify you of the change
Thanks, Simon. Indeed I did see that option. But I'm concerned about
maintaining integrity in the middle of an power-interrupted commit, so
I was hoping to leverage WAL's inverted behavior of not modifying the
database file directly until checkpoint time. The only thing left to
investigate is how W
Hi,
I'm writing some software that can read data off GeoPackage (SQLite + rtree
+ standardized
set of metadata tables) as an alternative format for spatial databases,
like PostgreSql with the
PostGIS extension.
Now, when I use PostGIS the query plan optimizer checks the bbox provided
in the query
On 29 Dec 2017, at 4:34pm, Ian Freeman wrote:
> I see, then what I'm seeing is just normal behavior of the writes being
> flushed to disk. I read what I wanted to hear about synchronous=NORMAL
> delaying writes to the -wal file. Instead I'm going to see if I can
> move -wal to a ramdisk and see
I see, then what I'm seeing is just normal behavior of the writes being
flushed to disk. I read what I wanted to hear about synchronous=NORMAL
delaying writes to the -wal file. Instead I'm going to see if I can
move -wal to a ramdisk and see how that will affect db integrity with
power losses at in
On 12/28/17, Ian Freeman wrote:
> I have configured journal_mode=WAL, synchronous=NORMAL, and disabled
> autocheckpointing, and yet the -wal file is modified after every update
> operation...
That is correct. "sync" means forcing the data from the internal
operating-system buffers out to persist
I have configured journal_mode=WAL, synchronous=NORMAL, and disabled
autocheckpointing, and yet the -wal file is modified after every update
operation...
That's not the documented behavior as I understand it. This smells like
a bug to me, but before I go that direction, is there an explanation
for
I want to analyze the executive process of wal-file with the source code
3.16.2 .
And I added:
unixFile *pFd = (unixFile *)pRet->pWalFd;
if(pFd->nFetchOut != 0){
printf("hi\n");
}
to sqlite3WalOpen() after sqlite3OsOpen() is called:
rc = sqlite3OsOpen(pVfs, zWalName, pRet->p
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