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Multi User database

Posted on 2001-09-12
Medium Priority
Last Modified: 2006-11-17
My access database was multi-user but recently, after moving it to another server it became single user.  Is this a workgroup issue or something?

I've checked the options menu to make sure it is shared.
Question by:keypusher

Expert Comment

ID: 6478714
Hi keypusher,

What is exactly the problem?

LVL 59
ID: 6479267
Make sure that all users have full read/write/delete priviledges for the directory where the MDB is stored.

If Access cannot create a LDB file, it will open in exclusive mode.


Author Comment

ID: 6483127
I get a message something like: You can not save at this time it is being edited by another user.  There is a .ldb file and I checked the read/write privileges.
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LVL 59
ID: 6483152
OK that's something else again.  You didn't say which version of Access this is, but until A2000, Access locked on pages and not records.

 This means that a single user can cause more then one record to be locked and hence, the dialog your getting.

There is a workaround for this, but before I go further, what version are we talking about?


Author Comment

ID: 6483624
Access '97
LVL 59

Accepted Solution

Jim Dettman (Microsoft MVP/ EE MVE) earned 120 total points
ID: 6483650
Well then you defintly locking on pages.  The workaround I mentioned is to pad the records enough so that only one record can fit on a page (Access records cannot span pages).  Since a page in A97 is 2048 bytes, you need to ensure that the page is larger than 1024 bytes.

This is done by calculating the current record size and then adding enough text fields filled with something to pad the record out.

I can go into more detail if you wish.

Author Comment

ID: 6483694
I little bit more detail would be helpful.
LVL 59
ID: 6484576
What you'll need to do is first figure out the existing record size.  OLE and memo fields are stored seperately from the rest of the record, and a 16 bytes pointer is put in wil the rest of the record unless they use 32 bytes or less.  

So for a record you have:
7 bytes overhead
1 byte overhead for each defined field
size for fields as you would expect (4 bytes for integer and single, 8 for long and double, etc).

Text fields however are special as they only store what's in the record.  In other words if I define a text field with 50 as the maximum length, and put a "A" in the field, only 1 character of storage of space is used.  So for text fields, assume one byte.

Total up all your existing fields and figure out the pad length (1024- record size).  Let's say you need 734 bytes of padding.

  734/255 (maximum text fields) = 2.878

 in this case, you'd round that off to 3 text fields of 255 characters each. Open the table in design view, add 3 text fields and set the deafult values to:

="xxxxxxxxxxxxxxxxxxxx.....xxxxxxxxxxx"  (255 "x")

  You must do this.  If you don't put something in the field, the space won't get used.

  Remember to run an update query on existing records as the default value only applies to new records.


Expert Comment

ID: 6784154

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LVL 54

Expert Comment

ID: 6983068
for keypusher

It's time to clean up this TA, so I will leave a recommendation in Community Support that this question is:
 - Answered by: JDettman  
Please leave any comments here within the
next seven days.



Expert Comment

ID: 6997556
Per recommendation, force-accepted by
CS Moderator

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