I've never tried this but, what if Access (2003) is not installed on the
server, in the classic front end back end setup? I know sometimes Jet
can process requests on the server, returning less rows. And I know Jet
is often or maybe even always already installed on server OS'. But,
anyone have formal experience with this? Can the install of Access on
the server be skipped?
5  1376 
wheel wrote: I've never tried this but, what if Access (2003) is not installed on
the server, in the classic front end back end setup? I know sometimes
Jet can process requests on the server, returning less rows.
No it cannot. The server in the case of a jet back end is a "file server"
only, essentially a remote hard drive. All processing is local on the
client. There is no need to have Access, MDAC, or anything else on the
server and it would make no difference if you did.
--
I don't check the Email account attached
to this message. Send instead to...
RBrandt at Hunter dot com
In article <cn************ *******@newssvr 14.news.prodigy .com>, ri*********@hot mail.com says... wheel wrote: I've never tried this but, what if Access (2003) is not installed on
the server, in the classic front end back end setup? I know sometimes
Jet can process requests on the server, returning less rows.
No it cannot. The server in the case of a jet back end is a "file server"
only, essentially a remote hard drive. All processing is local on the
client. There is no need to have Access, MDAC, or anything else on the
server and it would make no difference if you did.
OK. But I swear I've read many times something to the effect of
"contrary to many peoples beliefs, jet does not always retrieve all
records from a table when running a query, these are the conditions
under which it will be sure to pull them all...top 100 etc etc". Maybe
I'm crossing my wires and that sort of 'fact' applies to Access/Jet as a
front end to linked (ODBC) SQL Server backend tables?
I'll read around more on this, I know it's been hashed about for a
decade at least. But of course I'd still be interested in what you have
to say on the subject. Thanks
wheel <wh***@wheel.no t> wrote in
news:MP******** *************** *@newsgroups.co mcast.net: In article <cn************ *******@newssvr 14.news.prodigy .com>,
ri*********@hot mail.com says... wheel wrote: > I've never tried this but, what if Access (2003) is not
> installed on the server, in the classic front end back end
> setup? I know sometimes Jet can process requests on the
server, > returning less rows.
No it cannot. The server in the case of a jet back end is a
"file server" only, essentially a remote hard drive. All
processing is local on the client. There is no need to have
Access, MDAC, or anything else on the server and it would make
no difference if you did.
OK. But I swear I've read many times something to the effect of
"contrary to many peoples beliefs, jet does not always retrieve
all records from a table when running a query, these are the
conditions under which it will be sure to pull them all...top 100
etc etc". Maybe I'm crossing my wires and that sort of 'fact'
applies to Access/Jet as a front end to linked (ODBC) SQL Server
backend tables?
I'll read around more on this, I know it's been hashed about for
a decade at least. But of course I'd still be interested in what
you have to say on the subject. Thanks
What you've read is, in fact, true.
But all the selecting happesn on the workstation.
An MDB file is a collection of data pages, discreet chunks of data,
and each page is indexed at a certain level. The header of an MDB
file gives certain information about what's in the file. Your
workstation checks that header, then follows the path through the
least number of data pages to find the information it needs.
So, Jet does *not* need to retrieve the whole MDB file, but that's
not because of anything happening on the server, but because of the
way the MDB file is structured, which allows the workstation to
request only the needed data pages from the file system. --
David W. Fenton http://www.bway.net/~dfenton
dfenton at bway dot net http://www.bway.net/~dfassoc
In article <Xn************ *************** *******@216.196 .97.142>, dX********@bway .net.invalid says... wheel <wh***@wheel.no t> wrote in
news:MP******** *************** *@newsgroups.co mcast.net:
In article <cn************ *******@newssvr 14.news.prodigy .com>,
ri*********@hot mail.com says... wheel wrote:
> I've never tried this but, what if Access (2003) is not
> installed on the server, in the classic front end back end
> setup? I know sometimes Jet can process requests on the server, > returning less rows.
No it cannot. The server in the case of a jet back end is a
"file server" only, essentially a remote hard drive. All
processing is local on the client. There is no need to have
Access, MDAC, or anything else on the server and it would make no difference if you did.
OK. But I swear I've read many times something to the effect of
"contrary to many peoples beliefs, jet does not always retrieve
all records from a table when running a query, these are the
conditions under which it will be sure to pull them all...top 100
etc etc". Maybe I'm crossing my wires and that sort of 'fact'
applies to Access/Jet as a front end to linked (ODBC) SQL Server
backend tables?
I'll read around more on this, I know it's been hashed about for
a decade at least. But of course I'd still be interested in what
you have to say on the subject. Thanks
What you've read is, in fact, true.
But all the selecting happesn on the workstation.
An MDB file is a collection of data pages, discreet chunks of data,
and each page is indexed at a certain level. The header of an MDB
file gives certain information about what's in the file. Your
workstation checks that header, then follows the path through the
least number of data pages to find the information it needs.
So, Jet does *not* need to retrieve the whole MDB file, but that's
not because of anything happening on the server, but because of the
way the MDB file is structured, which allows the workstation to
request only the needed data pages from the file system. --
David W. Fenton http://www.bway.net/~dfenton
OK, thank to both of you for shedding some light on this. So, you're
saying that Jet on the client can request what is essentially only part
of the mdb file on the server? The "pages" that host the records that
are needed? In this scenario I can see why it wouldn't matter if the
backend data file was on a separate server or the same hdd as the front
end file. Interesting and very strange sounding! Wonder if this has
anything to do with mdbs getting corrupted if a client pc is turned off
while it's using a mbd on the server...no wonder.
"wheel" <wh***@wheel.no t> wrote Wonder if this has anything to do with mdbs getting
corrupted if a client pc is turned off while it's using
a mbd on the server...no wonder.
It is, in fact, one of the most frequetly encountered provable causes of
corruption. Power outages and flaky network implementations can cause
similar breaks in communications, too.
There are internal pointers, etc. that are set for I/O operations, and
UN-set after the operation completes. If you break connection and contact so
the DB is permanently, apparently still in an operation that was terminated,
it is one of the forms of corruption.
Larry Linson
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