Hello All,
Is the only solution to an update query which requires the records in a
certain order to dump the records into a temp table in the required
order, then do the update query?
I've tried nesting a select query with the proper sort order inside the
update query, but the update query still appears to complete in the
order of the records in the table. I thought that I'd keep it a simple
question without getting into the detail of the 2 solutions that I
already have working on the 360k record table. The issue I'm
specifically dealing with is bloat of the MDB file. The 2 solutions are
as follows:
1 Opening a recordset and moving through it 1 record at a time which
causes severe bloat.
2 Append the data to a temp table in the order required, then do the
update query and move it back to the original table. This requires
deletion of the data twice which causes some bloat, but not as
significant as the first.
I maybe missing something here, so your ideals would be appreciated.
TIA!
--
Regards,
Greg Strong
3  5135 
Hello Greg,
I'm not sure why solution 1 would result in any significant bloat. Are
you closing your recordset at the end of your process?
If you have a split front end (application) and back end (database) and
you can easily gain exclusive access to the back end during your
processing, simply compact the back end database programatically when
you're done (look at help for DAO CompactDatabase method ).
If you do end up having to use a temporary table, consider creating a
new temporary database in a separate file with your temp table in it
when you have to do this update process. This can be done either
through code or by having a 'template' database with an empty temp
table in it which you can create copies of. Link to the temp table in
your temp database from the database where your processing is going on.
When you are finished with the temp table simply unlink it and then
delete the entire temp database file.
HTH,
Bruce
Hello Greg,
I'm not sure why solution 1 would result in any significant bloat. Are
you closing your recordset at the end of your process?
If you have a split front end (application) and back end (database) and
you can easily gain exclusive access to the back end during your
processing, simply compact the back end database programatically when
you're done (look at help for DAO CompactDatabase method ).
If you do end up having to use a temporary table, consider creating a
new temporary database in a separate file with your temp table in it
when you have to do this update process. This can be done either
through code or by having a 'template' database with an empty temp
table in it which you can create copies of. Link to the temp table in
your temp database from the database where your processing is going on.
When you are finished with the temp table simply unlink it and then
delete the entire temp database file.
HTH,
Bruce
On 14 Oct 2005 14:34:11 -0700, br***@aristotle .net wrote: I'm not sure why solution 1 would result in any significant bloat.
Maybe it has something to do with the fact that the DB actually is
creating data with the random number generator. I'm starting with a
little and ending up with a lot. Given this and the fact that Access has
to have some way to 'go back' before committing a transaction may be
what is causing the bloat. I'm just thinking out loud here.
Are you closing your recordset at the end of your process?
Yes.
If you have a split front end (application) and back end (database) and
you can easily gain exclusive access to the back end during your
processing, simply compact the back end database programatically when
you're done (look at help for DAO CompactDatabase method ).
I've compacted the DB via code.
If you do end up having to use a temporary table, consider creating a
new temporary database in a separate file with your temp table in it
when you have to do this update process. This can be done either
through code or by having a 'template' database with an empty temp
table in it which you can create copies of. Link to the temp table in
your temp database from the database where your processing is going on.
When you are finished with the temp table simply unlink it and then
delete the entire temp database file.
Thanks for the ideal.
--
Regards,
Greg Strong This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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