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Form Slow, Then Fast

I have a very puzzling situation with a database. It's an Access 2000 mdb
with a SQL 7 back end, with forms bound using ODBC linked tables. At our
remote location (accessed via a T1 line) the time it took to go to a record
was very slow. The go to mechanism was a box that the user typed the index
value into a combo box, with very simple code attached:

with me.RecordsetClone
.FindFirst "[Index] = " & me.cboGoTo
If Not .NoMatch Then
Me.Bookmark = .Bookmark
End If
end with

Now, one would say that going to a record is slow because I'm using
..FindFirst over a T1 line. And that's what I thought. However, as I was
working with the form, commenting out various sections not related to the Go
To, I found that the Go To functionality changed, though I didn't modify the
code.

Previously, going to a record near the end of the 50,000 record recordset
took about 1-2 seconds, but going to a record near the beginning, took about
20 seconds. After the form changed, going to any record in the recordset
took about 1-2 seconds.

So the question remains: why did it take so long to go to a record near the
beginning of the recordset, but not near the end (and the ones in the middle
took an amount of time about halfway between the two), and what changed so
that now the form is working fine for all records?

I've compared the changed form with the previous copy, and I don't see any
differences. I've compared all code in the form module, and I've compared
all form properties. The forms are identical as far as I could tell. But
something happened as I was commenting/uncommenting code in the form that
got rid of the problem with it taking a long time to go to some of the
records.

My first thought was that something got recompiled, and now the form is
fast. So I went back to the original version and changed some code and
recompiled, also did a compact and repair. But it was still slow. I also
tried doing an explicit decompile and then recompiled it. But it was still
slow.

So this is very frustrating that the form is now working fine, but I can't
see anything that's changed. If I don't see why the form is now fast, then
there's no reason to believe that it might not at some point go back to
being slow again. And then I'd just have to hope that something changes. It
would be good to figure this out.

Any ideas as to what might have changed here to cause the form's Go To to be
fast would be appreciated.

Thanks,

Neil
Nov 13 '05 #1
8 1721
Hi

Could anyone (or a job) be affecting the backend?

John

"Neil" <no****@nospam.net> wrote in message
news:WA****************@newsread1.news.pas.earthli nk.net...
I have a very puzzling situation with a database. It's an Access 2000 mdb
with a SQL 7 back end, with forms bound using ODBC linked tables. At our
remote location (accessed via a T1 line) the time it took to go to a record
was very slow. The go to mechanism was a box that the user typed the index
value into a combo box, with very simple code attached:

with me.RecordsetClone
.FindFirst "[Index] = " & me.cboGoTo
If Not .NoMatch Then
Me.Bookmark = .Bookmark
End If
end with

Now, one would say that going to a record is slow because I'm using
.FindFirst over a T1 line. And that's what I thought. However, as I was
working with the form, commenting out various sections not related to the
Go To, I found that the Go To functionality changed, though I didn't
modify the code.

Previously, going to a record near the end of the 50,000 record recordset
took about 1-2 seconds, but going to a record near the beginning, took
about 20 seconds. After the form changed, going to any record in the
recordset took about 1-2 seconds.

So the question remains: why did it take so long to go to a record near
the beginning of the recordset, but not near the end (and the ones in the
middle took an amount of time about halfway between the two), and what
changed so that now the form is working fine for all records?

I've compared the changed form with the previous copy, and I don't see any
differences. I've compared all code in the form module, and I've compared
all form properties. The forms are identical as far as I could tell. But
something happened as I was commenting/uncommenting code in the form that
got rid of the problem with it taking a long time to go to some of the
records.

My first thought was that something got recompiled, and now the form is
fast. So I went back to the original version and changed some code and
recompiled, also did a compact and repair. But it was still slow. I also
tried doing an explicit decompile and then recompiled it. But it was still
slow.

So this is very frustrating that the form is now working fine, but I can't
see anything that's changed. If I don't see why the form is now fast, then
there's no reason to believe that it might not at some point go back to
being slow again. And then I'd just have to hope that something changes.
It would be good to figure this out.

Any ideas as to what might have changed here to cause the form's Go To to
be fast would be appreciated.

Thanks,

Neil

Nov 13 '05 #2
Neil wrote:
I have a very puzzling situation with a database. It's an Access 2000 mdb
with a SQL 7 back end, with forms bound using ODBC linked tables. At our
remote location (accessed via a T1 line) the time it took to go to a record
was very slow. The go to mechanism was a box that the user typed the index
value into a combo box, with very simple code attached:

with me.RecordsetClone
.FindFirst "[Index] = " & me.cboGoTo
If Not .NoMatch Then
Me.Bookmark = .Bookmark
End If
end with

Now, one would say that going to a record is slow because I'm using
.FindFirst over a T1 line. And that's what I thought. However, as I was
working with the form, commenting out various sections not related to the Go
To, I found that the Go To functionality changed, though I didn't modify the
code.

Previously, going to a record near the end of the 50,000 record recordset
took about 1-2 seconds, but going to a record near the beginning, took about
20 seconds. After the form changed, going to any record in the recordset
took about 1-2 seconds.

So the question remains: why did it take so long to go to a record near the
beginning of the recordset, but not near the end (and the ones in the middle
took an amount of time about halfway between the two), and what changed so
that now the form is working fine for all records?

I've compared the changed form with the previous copy, and I don't see any
differences. I've compared all code in the form module, and I've compared
all form properties. The forms are identical as far as I could tell. But
something happened as I was commenting/uncommenting code in the form that
got rid of the problem with it taking a long time to go to some of the
records.

My first thought was that something got recompiled, and now the form is
fast. So I went back to the original version and changed some code and
recompiled, also did a compact and repair. But it was still slow. I also
tried doing an explicit decompile and then recompiled it. But it was still
slow.

So this is very frustrating that the form is now working fine, but I can't
see anything that's changed. If I don't see why the form is now fast, then
there's no reason to believe that it might not at some point go back to
being slow again. And then I'd just have to hope that something changes. It
would be good to figure this out.

Any ideas as to what might have changed here to cause the form's Go To to be
fast would be appreciated.

Well, there may be lot's of reasons, but I didn't see
anything in your description that ruled out a first time
through delay. The first time you access the recordset may
require a bunch of connection activities to take place.
Another likely cause is that the first search fills the
memory cache so subsequent searches don't have to go back to
the server as often as the it did the first time. To
verify/refute this hypothesis, reboot your system between
each timing test.

Note that you can often avoid all this kind of stuff by
filtering the form's dataset instead of loading all the
records and then searching for the one you want, especially
if the filter field is indexed.

--
Marsh
MVP [MS Access]
Nov 13 '05 #3
The problem might actually be your combo box. The combo box holds locks on
the server side until its last record has been read. If you go to the last
row in the combo box (or ask for its list count in code) the locks are
released. If you don't access slowly populates list items in the background,
and can take a very long time to complete, even if the number of rows is
small, but especially if it is large.

On Sun, 16 Oct 2005 19:10:46 GMT, "Neil" <no****@nospam.net> wrote:
I have a very puzzling situation with a database. It's an Access 2000 mdb
with a SQL 7 back end, with forms bound using ODBC linked tables. At our
remote location (accessed via a T1 line) the time it took to go to a record
was very slow. The go to mechanism was a box that the user typed the index
value into a combo box, with very simple code attached:

with me.RecordsetClone
.FindFirst "[Index] = " & me.cboGoTo
If Not .NoMatch Then
Me.Bookmark = .Bookmark
End If
end with

Now, one would say that going to a record is slow because I'm using
.FindFirst over a T1 line. And that's what I thought. However, as I was
working with the form, commenting out various sections not related to the Go
To, I found that the Go To functionality changed, though I didn't modify the
code.

Previously, going to a record near the end of the 50,000 record recordset
took about 1-2 seconds, but going to a record near the beginning, took about
20 seconds. After the form changed, going to any record in the recordset
took about 1-2 seconds.

So the question remains: why did it take so long to go to a record near the
beginning of the recordset, but not near the end (and the ones in the middle
took an amount of time about halfway between the two), and what changed so
that now the form is working fine for all records?

I've compared the changed form with the previous copy, and I don't see any
differences. I've compared all code in the form module, and I've compared
all form properties. The forms are identical as far as I could tell. But
something happened as I was commenting/uncommenting code in the form that
got rid of the problem with it taking a long time to go to some of the
records.

My first thought was that something got recompiled, and now the form is
fast. So I went back to the original version and changed some code and
recompiled, also did a compact and repair. But it was still slow. I also
tried doing an explicit decompile and then recompiled it. But it was still
slow.

So this is very frustrating that the form is now working fine, but I can't
see anything that's changed. If I don't see why the form is now fast, then
there's no reason to believe that it might not at some point go back to
being slow again. And then I'd just have to hope that something changes. It
would be good to figure this out.

Any ideas as to what might have changed here to cause the form's Go To to be
fast would be appreciated.

Thanks,

Neil


Nov 13 '05 #4
No, I've tried it too many times and at too many different times of day for
it to be environmental. The results are always the same: the old version of
the form takes 20-25 seconds to go to record 100, and it takes 1-2 seconds
to go to record 50,000 (with records between those two varying in times
proportionally); the new version of the form takes 1-2 seconds to go to any
record, even though I didn't explicitly change anything, and I cannot find
any differences between the two forms.

N

"John Bell" <jb************@hotmail.com> wrote in message
news:43***********************@news.zen.co.uk...
Hi

Could anyone (or a job) be affecting the backend?

John

"Neil" <no****@nospam.net> wrote in message
news:WA****************@newsread1.news.pas.earthli nk.net...
I have a very puzzling situation with a database. It's an Access 2000 mdb
with a SQL 7 back end, with forms bound using ODBC linked tables. At our
remote location (accessed via a T1 line) the time it took to go to a
record was very slow. The go to mechanism was a box that the user typed
the index value into a combo box, with very simple code attached:

with me.RecordsetClone
.FindFirst "[Index] = " & me.cboGoTo
If Not .NoMatch Then
Me.Bookmark = .Bookmark
End If
end with

Now, one would say that going to a record is slow because I'm using
.FindFirst over a T1 line. And that's what I thought. However, as I was
working with the form, commenting out various sections not related to the
Go To, I found that the Go To functionality changed, though I didn't
modify the code.

Previously, going to a record near the end of the 50,000 record recordset
took about 1-2 seconds, but going to a record near the beginning, took
about 20 seconds. After the form changed, going to any record in the
recordset took about 1-2 seconds.

So the question remains: why did it take so long to go to a record near
the beginning of the recordset, but not near the end (and the ones in the
middle took an amount of time about halfway between the two), and what
changed so that now the form is working fine for all records?

I've compared the changed form with the previous copy, and I don't see
any differences. I've compared all code in the form module, and I've
compared all form properties. The forms are identical as far as I could
tell. But something happened as I was commenting/uncommenting code in the
form that got rid of the problem with it taking a long time to go to some
of the records.

My first thought was that something got recompiled, and now the form is
fast. So I went back to the original version and changed some code and
recompiled, also did a compact and repair. But it was still slow. I also
tried doing an explicit decompile and then recompiled it. But it was
still slow.

So this is very frustrating that the form is now working fine, but I
can't see anything that's changed. If I don't see why the form is now
fast, then there's no reason to believe that it might not at some point
go back to being slow again. And then I'd just have to hope that
something changes. It would be good to figure this out.

Any ideas as to what might have changed here to cause the form's Go To to
be fast would be appreciated.

Thanks,

Neil


Nov 13 '05 #5
Well, there may be lot's of reasons, but I didn't see
anything in your description that ruled out a first time
through delay. The first time you access the recordset may
require a bunch of connection activities to take place.
Yes, I should have mentioned that I did these tests repeatedly to rule that
out: go to record 100 (very slow); then manually move back to the first
record; then go to record 100 (still very slow); then back to the first
record; then go to record 50,000 (very fast); then back to the first record;
then go to record 100 (very slow); etc.

I should have noted that. Sorry.
Another likely cause is that the first search fills the
memory cache so subsequent searches don't have to go back to
the server as often as the it did the first time. To
verify/refute this hypothesis, reboot your system between
each timing test.
How would that explain why it's very fast when going to a record at the end
of the set?

Note that you can often avoid all this kind of stuff by
filtering the form's dataset instead of loading all the
records and then searching for the one you want, especially
if the filter field is indexed.
Yes, indeed. This is something the client wants, though, as they like being
able to switch back and forth between form view and datasheet view.
Otherwise, yes, that would be a better way to go.

Thanks,

N

--
Marsh
MVP [MS Access]

Nov 13 '05 #6

"Steve Jorgensen" <no****@nospam.nospam> wrote in message
news:ef********************************@4ax.com...
The problem might actually be your combo box. The combo box holds locks
on
the server side until its last record has been read. If you go to the
last
row in the combo box (or ask for its list count in code) the locks are
released.
Well, I think you've hit the nail on the head. I tried it with a text box,
and the problem wasn't there. That also explains the last-fast-first-slow
phenomenon, which I found very puzzling. Thanks! (I have to admit that I
posted this sort of like a message in a bottle, without much hope that
anything would come from it. Needless to say, I'm overjoyed here.)
If you don't access slowly populates list items in the background,
and can take a very long time to complete, even if the number of rows is
small, but especially if it is large.
I think you forgot a noun or a verb in the above, so I don't really
understand what you're saying. Could you rephrase it?

I'll just note that I didn't consider the combo boxes because the two forms
were identical, and I didn't recall changing anything there. So when I
compared the two forms, I only compared the code modules and the form
properties. I didn't examine the combo box properties.

However, in light of the above, I took a closer look at the combo boxes,
since, even though your explanation makes sense, it doesn't explain why go
to's are always fast on the new version of the form, even with the combo box
there. So I took a look at the two combo boxes, and, on the new version of
the form, where there's no problem, that combo box is *not* set to limit to
list, whereas the original one was. (I must have changed it as I was working
with the form.) So, apparently, that's the difference.

To confirm this, I went into the new version of the form, set the combo to
limit to list, and, voila!, it was slow like the other. Then I changed it
back to not limit to list, and it was fast again.

So I'm relieved to know that it's not a gremlin that's causing this.

Thanks again for your help.

Neil


On Sun, 16 Oct 2005 19:10:46 GMT, "Neil" <no****@nospam.net> wrote:
I have a very puzzling situation with a database. It's an Access 2000 mdb
with a SQL 7 back end, with forms bound using ODBC linked tables. At our
remote location (accessed via a T1 line) the time it took to go to a
record
was very slow. The go to mechanism was a box that the user typed the index
value into a combo box, with very simple code attached:

with me.RecordsetClone
.FindFirst "[Index] = " & me.cboGoTo
If Not .NoMatch Then
Me.Bookmark = .Bookmark
End If
end with

Now, one would say that going to a record is slow because I'm using
.FindFirst over a T1 line. And that's what I thought. However, as I was
working with the form, commenting out various sections not related to the
Go
To, I found that the Go To functionality changed, though I didn't modify
the
code.

Previously, going to a record near the end of the 50,000 record recordset
took about 1-2 seconds, but going to a record near the beginning, took
about
20 seconds. After the form changed, going to any record in the recordset
took about 1-2 seconds.

So the question remains: why did it take so long to go to a record near
the
beginning of the recordset, but not near the end (and the ones in the
middle
took an amount of time about halfway between the two), and what changed so
that now the form is working fine for all records?

I've compared the changed form with the previous copy, and I don't see any
differences. I've compared all code in the form module, and I've compared
all form properties. The forms are identical as far as I could tell. But
something happened as I was commenting/uncommenting code in the form that
got rid of the problem with it taking a long time to go to some of the
records.

My first thought was that something got recompiled, and now the form is
fast. So I went back to the original version and changed some code and
recompiled, also did a compact and repair. But it was still slow. I also
tried doing an explicit decompile and then recompiled it. But it was still
slow.

So this is very frustrating that the form is now working fine, but I can't
see anything that's changed. If I don't see why the form is now fast, then
there's no reason to believe that it might not at some point go back to
being slow again. And then I'd just have to hope that something changes.
It
would be good to figure this out.

Any ideas as to what might have changed here to cause the form's Go To to
be
fast would be appreciated.

Thanks,

Neil

Nov 13 '05 #7
On Sun, 16 Oct 2005 20:19:38 GMT, "Neil" <no****@nospam.net> wrote:

"Steve Jorgensen" <no****@nospam.nospam> wrote in message
news:ef********************************@4ax.com.. .
The problem might actually be your combo box. The combo box holds locks
on
the server side until its last record has been read. If you go to the
last
row in the combo box (or ask for its list count in code) the locks are
released.
Well, I think you've hit the nail on the head. I tried it with a text box,
and the problem wasn't there. That also explains the last-fast-first-slow
phenomenon, which I found very puzzling. Thanks! (I have to admit that I
posted this sort of like a message in a bottle, without much hope that
anything would come from it. Needless to say, I'm overjoyed here.)
If you don't access slowly populates list items in the background,
and can take a very long time to complete, even if the number of rows is
small, but especially if it is large.


I think you forgot a noun or a verb in the above, so I don't really
understand what you're saying. Could you rephrase it?


I was missing a comma. To rephrase... If you don't read the whole list by
selecting the last row in the combo box or by getting its list count, Access
will slowly retrieve the combo box rows in the background, it may take a very
long time, and some locks will be held for duration. Locks can be held for a
long time even by combo boxes with fairly few rows.

I'll just note that I didn't consider the combo boxes because the two forms
were identical, and I didn't recall changing anything there. So when I
compared the two forms, I only compared the code modules and the form
properties. I didn't examine the combo box properties.

However, in light of the above, I took a closer look at the combo boxes,
since, even though your explanation makes sense, it doesn't explain why go
to's are always fast on the new version of the form, even with the combo box
there. So I took a look at the two combo boxes, and, on the new version of
the form, where there's no problem, that combo box is *not* set to limit to
list, whereas the original one was. (I must have changed it as I was working
with the form.) So, apparently, that's the difference.

To confirm this, I went into the new version of the form, set the combo to
limit to list, and, voila!, it was slow like the other. Then I changed it
back to not limit to list, and it was fast again.

So I'm relieved to know that it's not a gremlin that's causing this.

Thanks again for your help.

Neil


On Sun, 16 Oct 2005 19:10:46 GMT, "Neil" <no****@nospam.net> wrote:
I have a very puzzling situation with a database. It's an Access 2000 mdb
with a SQL 7 back end, with forms bound using ODBC linked tables. At our
remote location (accessed via a T1 line) the time it took to go to a
record
was very slow. The go to mechanism was a box that the user typed the index
value into a combo box, with very simple code attached:

with me.RecordsetClone
.FindFirst "[Index] = " & me.cboGoTo
If Not .NoMatch Then
Me.Bookmark = .Bookmark
End If
end with

Now, one would say that going to a record is slow because I'm using
.FindFirst over a T1 line. And that's what I thought. However, as I was
working with the form, commenting out various sections not related to the
Go
To, I found that the Go To functionality changed, though I didn't modify
the
code.

Previously, going to a record near the end of the 50,000 record recordset
took about 1-2 seconds, but going to a record near the beginning, took
about
20 seconds. After the form changed, going to any record in the recordset
took about 1-2 seconds.

So the question remains: why did it take so long to go to a record near
the
beginning of the recordset, but not near the end (and the ones in the
middle
took an amount of time about halfway between the two), and what changed so
that now the form is working fine for all records?

I've compared the changed form with the previous copy, and I don't see any
differences. I've compared all code in the form module, and I've compared
all form properties. The forms are identical as far as I could tell. But
something happened as I was commenting/uncommenting code in the form that
got rid of the problem with it taking a long time to go to some of the
records.

My first thought was that something got recompiled, and now the form is
fast. So I went back to the original version and changed some code and
recompiled, also did a compact and repair. But it was still slow. I also
tried doing an explicit decompile and then recompiled it. But it was still
slow.

So this is very frustrating that the form is now working fine, but I can't
see anything that's changed. If I don't see why the form is now fast, then
there's no reason to believe that it might not at some point go back to
being slow again. And then I'd just have to hope that something changes.
It
would be good to figure this out.

Any ideas as to what might have changed here to cause the form's Go To to
be
fast would be appreciated.

Thanks,

Neil


Nov 13 '05 #8
>>> If you don't access slowly populates list items in the background,
and can take a very long time to complete, even if the number of rows is
small, but especially if it is large.
I think you forgot a noun or a verb in the above, so I don't really
understand what you're saying. Could you rephrase it?


I was missing a comma. To rephrase... If you don't read the whole list by
selecting the last row in the combo box or by getting its list count,
Access
will slowly retrieve the combo box rows in the background, it may take a
very
long time, and some locks will be held for duration. Locks can be held
for a
long time even by combo boxes with fairly few rows.


Right. (Isn't it fun working with a product like Access whose name can be a
noun or a verb? :-) )

What's strange, though, is that it happened multiple times. You'd think that
after the combo box went to the last record (and a resulting fast go to),
that it would have the list in cache and subsequent go to's would be fast.
But each time it was slow, even one right after the other.

Also, another interesting point is how the limit to list was the pivital
feature. You would think that, whether limit to list was set or not, that
Access would still need to populate the whole list, so the results would be
the same. I guess it has to cross-check the list with limit to list, so
maybe that's the difference.

N

I'll just note that I didn't consider the combo boxes because the two
forms
were identical, and I didn't recall changing anything there. So when I
compared the two forms, I only compared the code modules and the form
properties. I didn't examine the combo box properties.

However, in light of the above, I took a closer look at the combo boxes,
since, even though your explanation makes sense, it doesn't explain why go
to's are always fast on the new version of the form, even with the combo
box
there. So I took a look at the two combo boxes, and, on the new version of
the form, where there's no problem, that combo box is *not* set to limit
to
list, whereas the original one was. (I must have changed it as I was
working
with the form.) So, apparently, that's the difference.

To confirm this, I went into the new version of the form, set the combo to
limit to list, and, voila!, it was slow like the other. Then I changed it
back to not limit to list, and it was fast again.

So I'm relieved to know that it's not a gremlin that's causing this.

Thanks again for your help.

Neil


On Sun, 16 Oct 2005 19:10:46 GMT, "Neil" <no****@nospam.net> wrote:

I have a very puzzling situation with a database. It's an Access 2000
mdb
with a SQL 7 back end, with forms bound using ODBC linked tables. At our
remote location (accessed via a T1 line) the time it took to go to a
record
was very slow. The go to mechanism was a box that the user typed the
index
value into a combo box, with very simple code attached:

with me.RecordsetClone
.FindFirst "[Index] = " & me.cboGoTo
If Not .NoMatch Then
Me.Bookmark = .Bookmark
End If
end with

Now, one would say that going to a record is slow because I'm using
.FindFirst over a T1 line. And that's what I thought. However, as I was
working with the form, commenting out various sections not related to
the
Go
To, I found that the Go To functionality changed, though I didn't modify
the
code.

Previously, going to a record near the end of the 50,000 record
recordset
took about 1-2 seconds, but going to a record near the beginning, took
about
20 seconds. After the form changed, going to any record in the recordset
took about 1-2 seconds.

So the question remains: why did it take so long to go to a record near
the
beginning of the recordset, but not near the end (and the ones in the
middle
took an amount of time about halfway between the two), and what changed
so
that now the form is working fine for all records?

I've compared the changed form with the previous copy, and I don't see
any
differences. I've compared all code in the form module, and I've
compared
all form properties. The forms are identical as far as I could tell. But
something happened as I was commenting/uncommenting code in the form
that
got rid of the problem with it taking a long time to go to some of the
records.

My first thought was that something got recompiled, and now the form is
fast. So I went back to the original version and changed some code and
recompiled, also did a compact and repair. But it was still slow. I also
tried doing an explicit decompile and then recompiled it. But it was
still
slow.

So this is very frustrating that the form is now working fine, but I
can't
see anything that's changed. If I don't see why the form is now fast,
then
there's no reason to believe that it might not at some point go back to
being slow again. And then I'd just have to hope that something changes.
It
would be good to figure this out.

Any ideas as to what might have changed here to cause the form's Go To
to
be
fast would be appreciated.

Thanks,

Neil

Nov 13 '05 #9

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