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DBEngine.Idle

Posted on 2000-03-14
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Last Modified: 2008-02-20
Hi,

I am wondering where is the best place to use DBEngine.Idle dbRefreshCache in my data objects.

My objects encapsulate some DAO functionality.

E.g. Customer Object has the following methods:

AddNew
Delete
Update
Load
SaveChanges
MoveNext
MoveFirst

...etc
Get the picture?

For a multiuser environment DAO literature quotes that you should periodically use DBEngine.Idle dbRefreshCache to suspend processing and let the DAO engine catch up.

My question is where would be the best place to use this in my objects.

I was thinking of sticking it in all the methods that change the recordset,i.e  AddNew,Delete, Update and SaveChanges.

I am thinking correct or do I need certifying?

Should I just use it on all the methods including MoveFirst, MoveNext etc.

Thanks in Advance.

Best Wishes

Adrian Evans
United Kingdom.
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Question by:AdiEvans
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1 Comment
 

Accepted Solution

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RPoate earned 200 total points
ID: 2622719
My first thought on this one is that
"if it ain't broke don't fix it". In other words if you do not have a problem then you don't need to worry about it.

I found that I had a problem where I was changing the database tables (adding columns). When I tried to write to the columns to set values in then I was told that the columns did not exist.  When I looked in Access the columns were there.

I found out that if I delayed setting the column values then it worked.

It turned out to be a "NT4 lazy disk write" problem. NT "said" it had written the changes to disk but in fact it had not.  It took a few seconds to flush its buffers.

I solved the problem with:

CDB_WS.BeginTrans
DBEngine.Idle dbRefreshCache
CDB_WS.CommitTrans dbForceOSFlush

So in general terms I would suggest that you can use it anywhere you like but really it is only necessary if you have a problem.

Regards
Robert Poate

PS I'm not sure if this is a comment or an answer.
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