All I/O is done via page sized blocks. So the minimum amount of data to be
fetched will always be a page. The bigger issue is, as you said, when you
need to follow a chain of pages to get a small value at the end.
-j
On Thu, Oct 6, 2016 at 9:53 AM, Paul Sanderson wrote:
> > Long columns, esp
On Thu, Oct 6, 2016 at 9:25 AM, Hick Gunter wrote:
> SQLite compresses rows before storing and decompresses rows before
> returning fields. BLOB fields are the most time consuming to process and so
> should be placed at the end of the row. Often used fields - i.e. (foreign)
> key fields - should
> Long columns, especially TEXT or BLOBs which may have lots of data in, should
> go at the end. Because you don't want SQLite to have to fetch all that data
> from storage just to get at the column after it.
To be pedantic SQLite does not need to "fetch" all of the data from
strorage before a
ok
On 6 Oct 2016 8:08 p.m., "Simon Slavin" wrote:
>
> On 6 Oct 2016, at 3:37pm, Krishna Shukla
> wrote:
>
> > Help how can i import exel file in sqlite and get result in c# desktop
> > application ...?
>
> Please start a new thread for this question.
>
> Simon.
> ___
On 6 Oct 2016, at 2:46pm, Jeff Archer wrote:
> Are there any performance or other considerations of the order of the
> fields for an insert?
No. Order of columns in the CREATE TABLE command matters. Order they're named
in operations after that doesn't.
When SQLite needs to fetch values from
On 6 Oct 2016, at 3:37pm, Krishna Shukla wrote:
> Help how can i import exel file in sqlite and get result in c# desktop
> application ...?
Please start a new thread for this question.
Simon.
___
sqlite-users mailing list
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Help how can i import exel file in sqlite and get result in c# desktop
application ...?
On 6 Oct 2016 7:55 p.m., "Hick Gunter" wrote:
> SQLite compresses rows before storing and decompresses rows before
> returning fields. BLOB fields are the most time consuming to process and so
> should be pla
SQLite does not use any compression when storing data.
Occasionally rows have so much data that they overflow to an additonal
page(s) so the advice about defining tables so that blobs are at the
end of the definition is good - also columns that store long strings
might be better at the end of a ta
SQLite compresses rows before storing and decompresses rows before returning
fields. BLOB fields are the most time consuming to process and so should be
placed at the end of the row. Often used fields - i.e. (foreign) key fields -
should be placed at the front of the row. This will help most if
Sorry, that was just mistake in reducing the code for the email, please
ignore.
What do you mean "what matters is order of columns in table"? or was that
just referring to the typo?
Jeff Archer
jeffarch...@gmail.com
On Thu, Oct 6, 2016 at 9:52 AM, Clemens Ladisch wrote:
> Jeff Archer wrote
Jeff Archer wrote:
> Are there any performance or other considerations of the order of the
> fields for an insert?
No; what matters is the order of columns in the table.
> INSERT INTO mytable(wid1,cnt,dat,wid3,wid2) VALUES (?,?,?,?)
> - VS -
> INSERT INTO mytable(wid1,wid2,wid3,cnt,dat)
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