Hi:
I know this is a strange question, but I have inherited a system where files are copied
and records re auto numbered (as an index field) )frequently, and I am wondering how high
the number can go without the system crashing.
An ancillary question is how one resets an auto number so that the sequence starts again
at 1.
In the case of this file, the auto number field serves no useful purpose except as an
index, and identifier of a unique record, so no problem with renumbering the records
provided one does not try and create two identical numbers (in which case the system
throws up all over you!).
Regards
John Baker
16  20470 
Maximum size for an autonumber is 2,147,483,647 and the smallest it can be
is -2,147,483,648.
One way to reset it back to zero is to delete all records in the table and
then compact the database.
Jeff
"John Baker" <Ba******@Veriz on.net> wrote in message
news:i6******** *************** *********@4ax.c om... Hi:
I know this is a strange question, but I have inherited a system where
files are copied and records re auto numbered (as an index field) )frequently, and I am
wondering how high the number can go without the system crashing.
An ancillary question is how one resets an auto number so that the
sequence starts again at 1.
In the case of this file, the auto number field serves no useful purpose
except as an index, and identifier of a unique record, so no problem with renumbering
the records provided one does not try and create two identical numbers (in which case
the system throws up all over you!).
Regards
John Baker
Thanks.. its good to know I can do that.
Is there any programmatic way to reset it? I would almost like to reset it every time I
use it!
Best
John
"Jeff Smith" <No***@Not.This .Address> wrote: Maximum size for an autonumber is 2,147,483,647 and the smallest it can be
is -2,147,483,648.
One way to reset it back to zero is to delete all records in the table and
then compact the database.
Jeff
"John Baker" <Ba******@Veriz on.net> wrote in message
news:i6******* *************** **********@4ax. com... Hi:
I know this is a strange question, but I have inherited a system where
files are copied and records re auto numbered (as an index field) )frequently, and I am
wondering how high the number can go without the system crashing.
An ancillary question is how one resets an auto number so that the
sequence starts again at 1.
In the case of this file, the auto number field serves no useful purpose
except as an index, and identifier of a unique record, so no problem with renumbering
the records provided one does not try and create two identical numbers (in which case
the system throws up all over you!).
Regards
John Baker
If you're even thinking you might want to reset it,
don't use an autonumber.
Autonumbers are not meant to be meaningful, just unique.
"John Baker" <Ba******@Veriz on.net> wrote in message
news:lt******** *************** *********@4ax.c om... Thanks.. its good to know I can do that.
Is there any programmatic way to reset it? I would almost like to reset it
every time I use it!
Best
John
"Jeff Smith" <No***@Not.This .Address> wrote:
Maximum size for an autonumber is 2,147,483,647 and the smallest it can
beis -2,147,483,648.
One way to reset it back to zero is to delete all records in the table
andthen compact the database.
Jeff
"John Baker" <Ba******@Veriz on.net> wrote in message
news:i6******* *************** **********@4ax. com... Hi:
I know this is a strange question, but I have inherited a system where
files are copied and records re auto numbered (as an index field) )frequently, and I am
wondering how high the number can go without the system crashing.
An ancillary question is how one resets an auto number so that the
sequence starts again at 1.
In the case of this file, the auto number field serves no useful
purposeexcept as an index, and identifier of a unique record, so no problem with
renumberingthe records provided one does not try and create two identical numbers (in which
casethe system throws up all over you!).
Regards
John Baker
Jeff Smith wrote: Maximum size for an autonumber is 2,147,483,647
Out of interest, when using increment, what happens to the next record
after that number? Does it roll over into the negative?
Back in the old DOS days, I wrote a program to calculate prime numbers,
as I remember my 12MHz 286 was rather slow so for speed I wrote 4
separate bits to do it, going from integer, long, single then double so
that when say the integer got over 32767 it would error and the error
trap would resume to the long bit and carry on. This worked in the IDE
(MS Basic PDS 7.1) but when compiled to a stand alone .exe file it would
not error but would wrap into negative numbers, no matter if I used x87
emulation[1] or alternate math libs.
[1] Well I didn't have a 287 co-pro on there.
--
\\\\\\
\\ \\ Windows is searching
\ \ For your sig.
\ \ Please Wait.
\__\
Trevor,
If you create a new table (or compact an empty one), then append a record
with the autonumber field set to 2,147,483,647 then start entering records
manually the first manually entered record has an autonumber field value of
1 and then they increment as normal (2, 3, 4, 5 etc).
If, however, you create a new table (or compact an empty one), then append
a record with the autonumber field set to 2,147,483,646 then start entering
records manually the first manually entered record has an autonumber field
value of 2,147,483,647 but from then on they change to negative values,
-2147483648, -2147483647, -2147483646 and so on; note they are still
incrementing
(Tested in XP)
--
Terry Kreft
MVP Microsoft Access
"Trevor Best" <nospam@localho st> wrote in message
news:41******** *************** @auth.uk.news.e asynet.net... Jeff Smith wrote:
Maximum size for an autonumber is 2,147,483,647
Out of interest, when using increment, what happens to the next record
after that number? Does it roll over into the negative?
<SNIP> [1] Well I didn't have a 287 co-pro on there.
--
\\\\\\
\\ \\ Windows is searching
\ \ For your sig.
\ \ Please Wait.
\__\
John Baker <Ba******@Veriz on.net> wrote in
news:i6******** *************** *********@4ax.c om: I know this is a strange question, but I have inherited a system
where files are copied and records re auto numbered (as an index
field) )frequently, and I am wondering how high the number can go
without the system crashing.
An ancillary question is how one resets an auto number so that the
sequence starts again at 1.
In the case of this file, the auto number field serves no useful
purpose except as an index, and identifier of a unique record, so
no problem with renumbering the records provided one does not try
and create two identical numbers (in which case the system throws
up all over you!).
Others have already pointed out that if you actually care about the
values of the autonumber, then you're mis-using it.
Let me also point out that there's nothing magical about an
autonumber: it is just a special kind of default value. If you want
to re-use numbers, simply append your record with the autonumber set
to a value that is presently unused.
--
David W. Fenton http://www.bway.net/~dfenton
dfenton at bway dot net http://www.bway.net/~dfassoc
Normal autonumbers are long numbers. See the specification for Long.
If the table is empty, compacting the database will reset the auto
number to 1.
(david)
"John Baker" <Ba******@Veriz on.net> wrote in message
news:i6******** *************** *********@4ax.c om... Hi:
I know this is a strange question, but I have inherited a system where
files are copied and records re auto numbered (as an index field) )frequently, and I am
wondering how high the number can go without the system crashing.
An ancillary question is how one resets an auto number so that the
sequence starts again at 1.
In the case of this file, the auto number field serves no useful purpose
except as an index, and identifier of a unique record, so no problem with renumbering
the records provided one does not try and create two identical numbers (in which case
the system throws up all over you!).
Regards
John Baker
Terry:
If I understand what your saying correctly, overflowing an auto number will cause no
problems at all. In other words rather than the maximum number of UNIQUE auto numbers
being 2,147,483,647, it is in fact twice that, since you have the negative value AND the
positive one.
Have I understood that correctly?
Best
John
"Terry Kreft" <te*********@mp s.co.uk> wrote: Trevor,
If you create a new table (or compact an empty one), then append a record
with the autonumber field set to 2,147,483,647 then start entering records
manually the first manually entered record has an autonumber field value of
1 and then they increment as normal (2, 3, 4, 5 etc).
If, however, you create a new table (or compact an empty one), then append
a record with the autonumber field set to 2,147,483,646 then start entering
records manually the first manually entered record has an autonumber field
value of 2,147,483,647 but from then on they change to negative values,
-2147483648, -2147483647, -2147483646 and so on; note they are still
incrementing
(Tested in XP)
Yes, you have the full range of an unsigned long to play with.
--
Terry Kreft
MVP Microsoft Access
"John Baker" <Ba******@Veriz on.net> wrote in message
news:rd******** *************** *********@4ax.c om... Terry:
If I understand what your saying correctly, overflowing an auto number
will cause no problems at all. In other words rather than the maximum number of UNIQUE
auto numbers being 2,147,483,647, it is in fact twice that, since you have the negative
value AND the positive one.
Have I understood that correctly?
Best
John
"Terry Kreft" <te*********@mp s.co.uk> wrote:
Trevor,
If you create a new table (or compact an empty one), then append a
recordwith the autonumber field set to 2,147,483,647 then start entering
recordsmanually the first manually entered record has an autonumber field value
of1 and then they increment as normal (2, 3, 4, 5 etc).
If, however, you create a new table (or compact an empty one), then
appenda record with the autonumber field set to 2,147,483,646 then start
enteringrecords manually the first manually entered record has an autonumber
fieldvalue of 2,147,483,647 but from then on they change to negative values,
-2147483648, -2147483647, -2147483646 and so on; note they are still
incrementing
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