On 10/17/07, Uma Krishnan <[EMAIL PROTECTED]> wrote:
> Yes. Makes sense (not to cache query results for embedded apps).
> So what is cached. Just dirty pages? or are raw tables cached when
> queried?
SQLite implements a tables and indices as btrees over a pager layer.
The pager layer caches
PostgreSQL has the capability of storing pre-compiled SQL so that it can
be reused and have data bound to the compiled statement. I have not
looked at the mechanics, but it would be of interest and educational for
you to see the PostgreSQL approach.
Sqlite does cache the results of a query.
Yes. Makes sense (not to cache query results for embedded apps). So what is
cached. Just dirty pages? or are raw tables cached when queried?
Thanks
Uma
Scott Hess <[EMAIL PROTECTED]> wrote: On 10/17/07, Trevor Talbot wrote:
> On 10/17/07, Uma Krishnan wrote:
> > One other question, when a
On 10/17/07, Trevor Talbot <[EMAIL PROTECTED]> wrote:
> On 10/17/07, Uma Krishnan <[EMAIL PROTECTED]> wrote:
> > One other question, when a query is issued, does SQLite cache the results,
> > so that future queries can be processed off the cache (I think not)
>
> Like the "query cache" in some
On 10/17/07, Uma Krishnan <[EMAIL PROTECTED]> wrote:
> As far as I know, Postgres does not have a virtual engine. I could be wrong.
It's not a virtual machine style, where it has a specific instruction
set; instead it's more like a graph of operations. Execution means
walking a graph instead of
On 10/17/07, Uma Krishnan <[EMAIL PROTECTED]> wrote:
> One other question, when a query is issued, does SQLite cache the results, so
> that future queries can be processed off the cache (I think not)
Like the "query cache" in some other databases? No.
SQLite does have a cache of database
Regarding: "... when a query is issued, does SQLite cache the results,
so that future queries can be processed off the cache (I think not) "
...
=
P.S. And I should certainly have mentioned the sqlite items below:
http://sqlite.org/pragma.html
PRAGMA cache_size=
Regarding: "... when a query is issued, does SQLite cache the results,
so that future queries can be processed off the cache (I think not) "
Hi Uma,
In effect, powerful caching effects *do* occur because of the disk cache
provided by modern operating systems. Since the hard disk operations
Thanks John and Joe for your responses.
As far as I know, Postgres does not have a virtual engine. I could be wrong.
One other question, when a query is issued, does SQLite cache the results, so
that future queries can be processed off the cache (I think not)
Thanks
Uma
John Stanton <[EMAIL
Moreover, is it typical to have an implementation like VDBE in other databases
as well?
This is a common approach and has been used for a very long time. For
example we used it in products produced during the 1980s because
producing a virtual machine and a compiler for its
--- Uma Krishnan <[EMAIL PROTECTED]> wrote:
> I'm a student trying to understand SQLite for my DB project. There are a
> couple of aspects that
> I don't quite understand:
> 1) VDBE. I see how the vdbe stack is created using VDBEAddOp etc. But once
> the code is
> generated, I don't see when
Hello,
I'm a student trying to understand SQLite for my DB project. There are a couple
of aspects that I don't quite understand:
1) VDBE. I see how the vdbe stack is created using VDBEAddOp etc. But once the
code is generated, I don't see when it's executed. Moreover, is it typical to
have an
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